Merge pull request #18 from eugenp/master

update

algorithms-miscellaneous-1/pom.xml

@@ -64,7 +64,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>cobertura-maven-plugin</artifactId>
-                <version>2.7</version>
+                <version>${cobertura.plugin.version}</version>
                 <configuration>
                     <instrumentation>
                         <ignores>
@@ -85,6 +85,7 @@
         <commons-codec.version>1.11</commons-codec.version>
         <guava.version>27.0.1-jre</guava.version>
         <combinatoricslib3.version>3.3.0</combinatoricslib3.version>
+        <cobertura.plugin.version>2.7</cobertura.plugin.version>
     </properties>
 
 </project>

algorithms-miscellaneous-3/pom.xml

@@ -46,13 +46,13 @@
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
-            <version>3.8.1</version>
+            <version>${commons.lang3.version}</version>
         </dependency>
 
         <dependency>
             <groupId>pl.pragmatists</groupId>
             <artifactId>JUnitParams</artifactId>
-            <version>1.1.0</version>
+            <version>${JUnitParams.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -91,6 +91,8 @@
         <retrofit.version>2.6.0</retrofit.version>
         <jmh-core.version>1.19</jmh-core.version>
         <jmh-generator.version>1.19</jmh-generator.version>
+        <commons.lang3.version>3.8.1</commons.lang3.version>
+        <JUnitParams.version>1.1.0</JUnitParams.version>
     </properties>
 
 </project>

algorithms-miscellaneous-5/pom.xml

@@ -37,7 +37,7 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>28.1-jre</version>
+            <version>${guava.version}</version>
         </dependency>
 
         <dependency>
@@ -65,6 +65,7 @@
         <org.assertj.core.version>3.9.0</org.assertj.core.version>
         <commons-codec.version>1.11</commons-codec.version>
         <commons-math3.version>3.6.1</commons-math3.version>
+        <guava.version>28.1-jre</guava.version>
     </properties>
 
 </project>

apache-cxf/sse-jaxrs/sse-jaxrs-server/pom.xml

@@ -18,19 +18,19 @@
         <dependency>
             <groupId>javax.ws.rs</groupId>
             <artifactId>javax.ws.rs-api</artifactId>
-            <version>2.1</version>
+            <version>${rs-api.version}</version>
             <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>javax.enterprise</groupId>
             <artifactId>cdi-api</artifactId>
-            <version>2.0</version>
+            <version>${cdi-api.version}</version>
             <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>javax.json.bind</groupId>
             <artifactId>javax.json.bind-api</artifactId>
-            <version>1.0</version>
+            <version>${bind-api.version}</version>
             <scope>provided</scope>
         </dependency>
 
@@ -80,6 +80,9 @@
         <liberty-maven-plugin.version>2.4.2</liberty-maven-plugin.version>
         <failOnMissingWebXml>false</failOnMissingWebXml>
         <openliberty-version>18.0.0.2</openliberty-version>
+        <rs-api.version>2.1</rs-api.version>
+        <cdi-api.version>2.0</cdi-api.version>
+        <bind-api.version>1.0</bind-api.version>
     </properties>
 
 </project>

apache-rocketmq/pom.xml

@@ -17,11 +17,12 @@
         <dependency>
             <groupId>org.apache.rocketmq</groupId>
             <artifactId>rocketmq-spring-boot-starter</artifactId>
-            <version>2.0.4</version>
+            <version>${rocketmq.version}</version>
         </dependency>
     </dependencies>
 
     <properties>
         <geode.core>1.6.0</geode.core>
+        <rocketmq.version>2.0.4</rocketmq.version>
     </properties>
 </project>

apache-tapestry/pom.xml

@@ -81,10 +81,10 @@ of testing facilities designed for use with TestNG (http://testng.org/), so it's
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>2.3.2</version>
+                <version>${compiler.plugin.version}</version>
                 <configuration>
-                    <source>1.8</source>
+                    <source>${source.version}</source>
-                    <target>1.8</target>
+                    <target>${target.version}</target>
                     <optimize>true</optimize>
                 </configuration>
             </plugin>
@@ -92,7 +92,7 @@ of testing facilities designed for use with TestNG (http://testng.org/), so it's
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.7.2</version>
+                <version>${compiler.surefire.version}</version>
                 <configuration>
                     <systemPropertyVariables>
                         <tapestry.execution-mode>Qa</tapestry.execution-mode>
@@ -104,7 +104,7 @@ of testing facilities designed for use with TestNG (http://testng.org/), so it's
             <plugin>
                 <groupId>org.mortbay.jetty</groupId>
                 <artifactId>maven-jetty-plugin</artifactId>
-                <version>6.1.16</version>
+                <version>${compiler.jetty.version}</version>
                 <configuration>
                     <!-- Log to the console. -->
                     <requestLog implementation="org.mortbay.jetty.NCSARequestLog">
@@ -140,6 +140,11 @@ of testing facilities designed for use with TestNG (http://testng.org/), so it's
     </repositories>
 
     <properties>
+        <compiler.jetty.version>6.1.16</compiler.jetty.version>
+        <compiler.surefire.version>2.7.2</compiler.surefire.version>
+        <compiler.plugin.version>2.3.2</compiler.plugin.version>
+        <source.version>1.8</source.version>
+        <target.version>1.8</target.version>
         <tapestry-release-version>5.4.5</tapestry-release-version>
         <servlet-api-release-version>2.5</servlet-api-release-version>
         <testng-release-version>6.8.21</testng-release-version>

aws-reactive/pom.xml

@@ -17,6 +17,8 @@
 
 	<properties>
 		<java.version>1.8</java.version>
+        <spring.version>2.2.1.RELEASE</spring.version>
+        <awssdk.version>2.10.27</awssdk.version>
 	</properties>
 
 	<dependencyManagement>
@@ -26,7 +28,7 @@
 				<!-- Import dependency management from Spring Boot -->
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-dependencies</artifactId>
-				<version>2.2.1.RELEASE</version>
+				<version>${spring.version}</version>
 				<type>pom</type>
 				<scope>import</scope>
 			</dependency>
@@ -34,7 +36,7 @@
 			<dependency>
 				<groupId>software.amazon.awssdk</groupId>
 				<artifactId>bom</artifactId>
-				<version>2.10.27</version>
+				<version>${awssdk.version}</version>
 				<type>pom</type>
 				<scope>import</scope>
 			</dependency>

blade/pom.xml

@@ -124,7 +124,7 @@
 
             <plugin>
                 <artifactId>maven-assembly-plugin</artifactId>
-                <version>3.1.0</version>
+                <version>${assembly.plugin.version}</version>
                 <configuration>
                     <finalName>${project.build.finalName}</finalName>
                     <appendAssemblyId>false</appendAssemblyId>
@@ -161,6 +161,7 @@
         <assertj-core.version>3.11.1</assertj-core.version>
         <maven-failsafe-plugin.version>3.0.0-M3</maven-failsafe-plugin.version>
         <process-exec-maven-plugin.version>0.7</process-exec-maven-plugin.version>
+        <assembly.plugin.version>3.1.0</assembly.plugin.version>
     </properties>
 
 </project>

core-groovy-2/pom.xml

@@ -62,12 +62,12 @@
             <plugin>
                 <groupId>org.codehaus.groovy</groupId>
                 <artifactId>groovy-eclipse-compiler</artifactId>
-                <version>3.3.0-01</version>
+                <version>${groovy.compiler.version}</version>
                 <extensions>true</extensions>
             </plugin>
             <plugin>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.0</version>
+                <version>${compiler.plugin.version}</version>
                 <configuration>
                     <compilerId>groovy-eclipse-compiler</compilerId>
                     <source>${java.version}</source>
@@ -113,7 +113,7 @@
             </plugin>
             <plugin>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.20.1</version>
+                <version>${surefire.plugin.version}</version>
                 <configuration>
                     <useFile>false</useFile>
                     <includes>
@@ -126,7 +126,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-assembly-plugin</artifactId>
-                <version>3.1.0</version>
+                <version>${assembly.plugin.version}</version>
                 <configuration>
                     <!-- get all project dependencies -->
                     <descriptorRefs>
@@ -183,6 +183,10 @@
         <groovy-wslite.version>1.1.3</groovy-wslite.version>
         <logback.version>1.2.3</logback.version>
         <groovy.version>2.5.7</groovy.version>
+        <assembly.plugin.version>3.1.0</assembly.plugin.version>
+        <surefire.plugin.version>2.20.1</surefire.plugin.version>
+        <compiler.plugin.version>3.8.0</compiler.plugin.version>
+        <groovy.compiler.version>3.3.0-01</groovy.compiler.version>
     </properties>
 
 </project>

core-groovy-collections/pom.xml

@@ -99,7 +99,7 @@
             </plugin>
             <plugin>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.20.1</version>
+                <version>${surefire.plugin.version}</version>
                 <configuration>
                     <useFile>false</useFile>
                     <includes>
@@ -126,6 +126,7 @@
         <hsqldb.version>2.4.0</hsqldb.version>
         <spock-core.version>1.1-groovy-2.4</spock-core.version>
         <gmavenplus-plugin.version>1.6</gmavenplus-plugin.version>
+        <surefire.plugin.version>2.20.1</surefire.plugin.version>
     </properties>
 
 </project>

core-java-modules/core-java-11/pom.xml

@@ -42,12 +42,12 @@
         <dependency>
             <groupId>org.eclipse.collections</groupId>
             <artifactId>eclipse-collections</artifactId>
-            <version>10.0.0</version>
+            <version>${eclipse.collections.version}</version>
         </dependency>
         <dependency>
             <groupId>org.eclipse.collections</groupId>
             <artifactId>eclipse-collections-api</artifactId>
-            <version>10.0.0</version>
+            <version>${eclipse.collections.version}</version>
         </dependency>
     </dependencies>
 
@@ -108,6 +108,7 @@
         <assertj.version>3.11.1</assertj.version>
         <uberjar.name>benchmarks</uberjar.name>
         <jmh.version>1.22</jmh.version>
+        <eclipse.collections.version>10.0.0</eclipse.collections.version>
     </properties>
 
 </project>

core-java-modules/core-java-13/pom.xml

@@ -41,7 +41,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>3.0.0-M3</version>
+                <version>${surefire.plugin.version}</version>
                 <configuration>
                     <argLine>--enable-preview</argLine>
                 </configuration>
@@ -53,6 +53,7 @@
         <maven.compiler.source.version>13</maven.compiler.source.version>
         <maven.compiler.target.version>13</maven.compiler.target.version>
         <assertj.version>3.6.1</assertj.version>
+        <surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
     </properties>
 
 </project>

core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/SwitchExpressionsWithYieldUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.newfeatures;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class SwitchExpressionsWithYieldUnitTest {
+
+    @Test
+    @SuppressWarnings("preview")
+    public void whenSwitchingOnOperationSquareMe_thenWillReturnSquare() {
+        var me = 4;
+        var operation = "squareMe";
+        var result = switch (operation) {
+        case "doubleMe" -> {
+            yield me * 2;
+        }
+        case "squareMe" -> {
+            yield me * me;
+        }
+        default -> me;
+        };
+
+        assertEquals(16, result);
+    }
+
+}

core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/TextBlocksUnitTest.java

@@ -0,0 +1,39 @@
+package com.baeldung.newfeatures;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.Test;
+
+public class TextBlocksUnitTest {
+
+    private static final String JSON_STRING = "{\r\n" + "\"name\" : \"Baeldung\",\r\n" + "\"website\" : \"https://www.%s.com/\"\r\n" + "}";
+
+    @SuppressWarnings("preview")
+    private static final String TEXT_BLOCK_JSON = """
+            {
+            "name" : "Baeldung",
+            "website" : "https://www.%s.com/"
+            }
+        """;
+
+    @Test
+    public void whenTextBlocks_thenStringOperationsWork() {
+
+        assertThat(TEXT_BLOCK_JSON.contains("Baeldung")).isTrue();
+        assertThat(TEXT_BLOCK_JSON.indexOf("www")).isGreaterThan(0);
+        assertThat(TEXT_BLOCK_JSON.length()).isGreaterThan(0);
+
+    }
+
+    @SuppressWarnings("removal")
+    @Test
+    public void whenTextBlocks_thenFormattedWorksAsFormat() {
+        assertThat(TEXT_BLOCK_JSON.formatted("baeldung")
+            .contains("www.baeldung.com")).isTrue();
+
+        assertThat(String.format(JSON_STRING, "baeldung")
+            .contains("www.baeldung.com")).isTrue();
+
+    }
+   
+}

core-java-modules/core-java-14/pom.xml

@@ -36,7 +36,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-surefire-plugin</artifactId>
-				<version>3.0.0-M3</version>
+				<version>${surefire.plugin.version}</version>
 				<configuration>
 					<argLine>--enable-preview</argLine>
 				</configuration>
@@ -47,6 +47,7 @@
 	<properties>
 		<maven.compiler.source.version>14</maven.compiler.source.version>
 		<maven.compiler.target.version>14</maven.compiler.target.version>
+        <surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
 	</properties>
 
 </project>

core-java-modules/core-java-arrays-2/pom.xml

@@ -51,7 +51,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-shade-plugin</artifactId>
-				<version>3.2.0</version>
+				<version>${shade.plugin.version}</version>
 				<executions>
 					<execution>
 						<phase>package</phase>
@@ -79,6 +79,7 @@
         <commons-lang3.version>3.9</commons-lang3.version>
         <!-- testing -->
         <assertj-core.version>3.10.0</assertj-core.version>
+        <shade.plugin.version>3.2.0</shade.plugin.version>
     </properties>
 
 </project>

core-java-modules/core-java-arrays/pom.xml

@@ -183,8 +183,8 @@
                 <artifactId>maven-javadoc-plugin</artifactId>
                 <version>${maven-javadoc-plugin.version}</version>
                 <configuration>
-                    <source>1.8</source>
+                    <source>${source.version}</source>
-                    <target>1.8</target>
+                    <target>${target.version}</target>
                 </configuration>
             </plugin>
         </plugins>
@@ -373,6 +373,8 @@
         <maven-shade-plugin.version>3.1.1</maven-shade-plugin.version>
         <spring-boot-maven-plugin.version>2.0.3.RELEASE</spring-boot-maven-plugin.version>
         <exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
+        <source.version>1.8</source.version>
+        <target.version>1.8</target.version>
     </properties>
 
 </project>

core-java-modules/core-java-jar/pom.xml

@@ -207,8 +207,8 @@
                 <artifactId>maven-javadoc-plugin</artifactId>
                 <version>${maven-javadoc-plugin.version}</version>
                 <configuration>
-                    <source>1.8</source>
+                    <source>${source.version}</source>
-                    <target>1.8</target>
+                    <target>${target.version}</target>
                 </configuration>
             </plugin>
         </plugins>
@@ -397,6 +397,8 @@
         <maven-shade-plugin.version>3.1.1</maven-shade-plugin.version>
         <spring-boot-maven-plugin.version>2.0.3.RELEASE</spring-boot-maven-plugin.version>
         <exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
+        <source.version>1.8</source.version>
+        <target.version>1.8</target.version>
     </properties>
 
 </project>

core-java-modules/core-java-jndi/pom.xml

@@ -19,34 +19,34 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>
-            <version>5.5.1</version>
+            <version>${jupiter.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-core</artifactId>
-            <version>5.0.9.RELEASE</version>
+            <version>${spring.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-context</artifactId>
-            <version>5.0.9.RELEASE</version>
+            <version>${spring.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-jdbc</artifactId>
-            <version>5.0.9.RELEASE</version>
+            <version>${spring.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-test</artifactId>
-            <version>5.0.9.RELEASE</version>
+            <version>${spring.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
-            <version>1.4.199</version>
+            <version>${h2.version}</version>
         </dependency>
     </dependencies>
 
@@ -56,11 +56,19 @@
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
                 <configuration>
-                    <source>1.8</source>
+                    <source>${source.version}</source>
-                    <target>1.8</target>
+                    <target>${target.version}</target>
                 </configuration>
             </plugin>
         </plugins>
     </build>
+    
+    <properties>
+        <spring.version>5.0.9.RELEASE</spring.version>
+        <h2.version>1.4.199</h2.version>
+        <jupiter.version>5.5.1</jupiter.version>
+        <source.version>1.8</source.version>
+        <target.version>1.8</target.version>
+    </properties>
 
 </project>

core-java-modules/core-java-jpms/decoupling-pattern1/consumermodule/pom.xml

@@ -16,7 +16,7 @@
         <dependency>
             <groupId>com.baeldung.servicemodule</groupId>
             <artifactId>servicemodule</artifactId>
-            <version>1.0</version>
+            <version>${servicemodule.version}</version>
         </dependency>
     </dependencies>
 
@@ -29,4 +29,8 @@
         </plugins>
     </build>
 
+    <properties>
+        <servicemodule.version>1.0</servicemodule.version>
+    </properties>
+
 </project>

core-java-modules/core-java-jpms/decoupling-pattern1/pom.xml

@@ -19,10 +19,10 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.8.0</version>
+                    <version>${compiler.plugin.version}</version>
                     <configuration>
-                        <source>11</source>
+                        <source>${source.version}</source>
-                        <target>11</target>
+                        <target>${target.version}</target>
                     </configuration>
                 </plugin>
             </plugins>
@@ -31,6 +31,9 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <compiler.plugin.version>3.8.0</compiler.plugin.version>
+        <source.version>11</source.version>
+        <target.version>11</target.version>
     </properties>
 
 </project>

core-java-modules/core-java-jpms/decoupling-pattern2/consumermodule/pom.xml

@@ -17,12 +17,12 @@
         <dependency>
             <groupId>com.baeldung.servicemodule</groupId>
             <artifactId>servicemodule</artifactId>
-            <version>1.0</version>
+            <version>${servicemodule.version}</version>
         </dependency>
         <dependency>
             <groupId>com.baeldung.providermodule</groupId>
             <artifactId>providermodule</artifactId>
-            <version>1.0</version>
+            <version>${providermodule.version}</version>
         </dependency>
     </dependencies>
 
@@ -34,5 +34,10 @@
             </plugin>
         </plugins>
     </build>
+	
+    <properties>
+        <servicemodule.version>1.0</servicemodule.version>
+        <providermodule.version>1.0</providermodule.version>
+    </properties>
 
 </project>

core-java-modules/core-java-jpms/decoupling-pattern2/pom.xml

@@ -20,14 +20,20 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.8.0</version>
+                    <version>${compiler.plugin.version}</version>
                     <configuration>
-                        <source>11</source>
+                        <source>${source.version}</source>
-                        <target>11</target>
+                        <target>${target.version}</target>
                     </configuration>
                 </plugin>
             </plugins>
         </pluginManagement>
     </build>
+	
+    <properties>
+        <compiler.plugin.version>3.8.0</compiler.plugin.version>
+        <source.version>11</source.version>
+        <target.version>11</target.version>
+    </properties>
 
 </project>

core-java-modules/core-java-jpms/decoupling-pattern2/providermodule/pom.xml

@@ -17,7 +17,7 @@
         <dependency>
             <groupId>com.baeldung.servicemodule</groupId>
             <artifactId>servicemodule</artifactId>
-            <version>1.0</version>
+            <version>${servicemodule.version}</version>
         </dependency>
     </dependencies>
 
@@ -30,4 +30,9 @@
         </plugins>
     </build>
 
+    <properties>
+        <servicemodule.version>1.0</servicemodule.version>
+	</properties>
+
+
 </project>

core-java-modules/core-java-lang-2/pom.xml

@@ -18,7 +18,7 @@
         <dependency>
             <groupId>commons-beanutils</groupId>
             <artifactId>commons-beanutils</artifactId>
-            <version>1.9.4</version>
+            <version>${commons.beanutils.version}</version>
         </dependency>
         <dependency>
             <groupId>org.openjdk.jmh</groupId>
@@ -57,6 +57,7 @@
         <jmh-core.version>1.19</jmh-core.version>
         <jmh-generator.version>1.19</jmh-generator.version>
         <assertj.version>3.12.2</assertj.version>
+        <commons.beanutils.version>1.9.4</commons.beanutils.version>
     </properties>
 
 </project>

core-java-modules/core-java-reflection/pom.xml

@@ -37,8 +37,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>${maven-compiler-plugin.version}</version>
                 <configuration>
-                    <source>1.8</source>
+                    <source>${source.version}</source>
-                    <target>1.8</target>
+                    <target>${target.version}</target>
                     <compilerArgument>-parameters</compilerArgument>
                 </configuration>
             </plugin>
@@ -48,5 +48,7 @@
     <properties>
         <maven-compiler-plugin.version>3.8.0</maven-compiler-plugin.version>
         <assertj-core.version>3.10.0</assertj-core.version>
+        <source.version>1.8</source.version>
+        <target.version>1.8</target.version>
     </properties>
 </project>

core-java-modules/core-java-string-algorithms-3/pom.xml

@@ -25,7 +25,7 @@
 		<dependency>
 			<groupId>com.google.guava</groupId>
 			<artifactId>guava</artifactId>
-			<version>28.1-jre</version>
+			<version>${guava.version}</version>
 		</dependency>
 
 		<dependency>
@@ -62,7 +62,7 @@
 	<properties>
 		<commons-lang3.version>3.8.1</commons-lang3.version>
 		<assertj.version>3.6.1</assertj.version>
-		<guava.version>27.0.1-jre</guava.version>
+		<guava.version>28.1-jre</guava.version>
 		<junit-jupiter-api.version>5.3.1</junit-jupiter-api.version>
 	</properties>
 

core-java-modules/core-java-text/src/test/java/com/baeldung/regex/matcher/MatcherUnitTest.java

@@ -0,0 +1,63 @@
+package com.baeldung.regex.matcher;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.junit.jupiter.api.Test;
+
+public class MatcherUnitTest {
+
+    @Test
+    public void whenFindFourDigitWorks_thenCorrect() {
+        Pattern stringPattern = Pattern.compile("\\d\\d\\d\\d");
+        Matcher m = stringPattern.matcher("goodbye 2019 and welcome 2020");
+
+        assertTrue(m.find());
+        assertEquals(8, m.start());
+        assertEquals("2019", m.group());
+        assertEquals(12, m.end());
+
+        assertTrue(m.find());
+        assertEquals(25, m.start());
+        assertEquals("2020", m.group());
+        assertEquals(29, m.end());
+
+        assertFalse(m.find());
+    }
+
+    @Test
+    public void givenStartIndex_whenFindFourDigitWorks_thenCorrect() {
+        Pattern stringPattern = Pattern.compile("\\d\\d\\d\\d");
+        Matcher m = stringPattern.matcher("goodbye 2019 and welcome 2020");
+
+        assertTrue(m.find(20));
+        assertEquals(25, m.start());
+        assertEquals("2020", m.group());
+        assertEquals(29, m.end());
+    }
+
+    @Test
+    public void whenMatchFourDigitWorks_thenFail() {
+        Pattern stringPattern = Pattern.compile("\\d\\d\\d\\d");
+        Matcher m = stringPattern.matcher("goodbye 2019 and welcome 2020");
+        assertFalse(m.matches());
+    }
+
+    @Test
+    public void whenMatchFourDigitWorks_thenCorrect() {
+        Pattern stringPattern = Pattern.compile("\\d\\d\\d\\d");
+        Matcher m = stringPattern.matcher("2019");
+
+        assertTrue(m.matches());
+        assertEquals(0, m.start());
+        assertEquals("2019", m.group());
+        assertEquals(4, m.end());
+
+        assertTrue(m.matches());// matches will always return the same return
+    }
+
+}

core-java-modules/core-java/pom.xml

@@ -207,8 +207,8 @@
                 <artifactId>maven-javadoc-plugin</artifactId>
                 <version>${maven-javadoc-plugin.version}</version>
                 <configuration>
-                    <source>1.8</source>
+                    <source>${source.version}</source>
-                    <target>1.8</target>
+                    <target>${target.version}</target>
                 </configuration>
             </plugin>
         </plugins>
@@ -397,6 +397,8 @@
         <maven-shade-plugin.version>3.1.1</maven-shade-plugin.version>
         <spring-boot-maven-plugin.version>2.0.3.RELEASE</spring-boot-maven-plugin.version>
         <exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
+        <source.version>1.8</source.version>
+        <target.version>1.8</target.version>
     </properties>
 
 </project>

core-java-modules/multimodulemavenproject/mainappmodule/pom.xml

@@ -17,17 +17,17 @@
         <dependency>
             <groupId>com.baeldung.entitymodule</groupId>
             <artifactId>entitymodule</artifactId>
-            <version>1.0</version>
+            <version>${entitymodule.version}</version>
         </dependency>
         <dependency>
             <groupId>com.baeldung.daomodule</groupId>
             <artifactId>daomodule</artifactId>
-            <version>1.0</version>
+            <version>${daomodule.version}</version>
         </dependency>
         <dependency>
             <groupId>com.baeldung.userdaomodule</groupId>
             <artifactId>userdaomodule</artifactId>
-            <version>1.0</version>
+            <version>${userdaomodule.version}</version>
         </dependency>
     </dependencies>
 
@@ -43,6 +43,9 @@
     <properties>
         <maven.compiler.source>9</maven.compiler.source>
         <maven.compiler.target>9</maven.compiler.target>
+        <entitymodule.version>1.0</entitymodule.version>
+        <daomodule.version>1.0</daomodule.version>
+        <userdaomodule.version>1.0</userdaomodule.version>
     </properties>
 
 </project>

core-java-modules/multimodulemavenproject/pom.xml

@@ -45,10 +45,10 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.8.0</version>
+                    <version>${compiler.plugin.version}</version>
                     <configuration>
-                        <source>1.9</source>
+                        <source>${source.version}</source>
-                        <target>1.9</target>
+                        <target>${target.version}</target>
                     </configuration>
                 </plugin>
             </plugins>
@@ -56,6 +56,9 @@
     </build>
 
     <properties>
+        <compiler.plugin.version>3.8.0</compiler.plugin.version>
+        <source.version>1.9</source.version>
+        <target.version>1.9</target.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <assertj-core.version>3.12.2</assertj-core.version>
     </properties>

core-java-modules/multimodulemavenproject/userdaomodule/pom.xml

@@ -17,12 +17,12 @@
         <dependency>
             <groupId>com.baeldung.entitymodule</groupId>
             <artifactId>entitymodule</artifactId>
-            <version>1.0</version>
+            <version>${entitymodule.version}</version>
         </dependency>
         <dependency>
             <groupId>com.baeldung.daomodule</groupId>
             <artifactId>daomodule</artifactId>
-            <version>1.0</version>
+            <version>${daomodule.version}</version>
         </dependency>
     </dependencies>
 
@@ -38,6 +38,8 @@
     <properties>
         <maven.compiler.source>9</maven.compiler.source>
         <maven.compiler.target>9</maven.compiler.target>
+        <entitymodule.version>1.0</entitymodule.version>
+        <daomodule.version>1.0</daomodule.version>
     </properties>
 
 </project>

core-java-modules/pre-jpms/pom.xml

@@ -29,16 +29,16 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.0</version>
+                <version>${compiler.plugin.version}</version>
                 <configuration>
-                    <source>1.8</source>
+                    <source>${source.version}</source>
-                    <target>1.8</target>
+                    <target>${target.version}</target>
                 </configuration>
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-dependency-plugin</artifactId>
-                <version>3.1.1</version>
+                <version>${dependency.plugin.version}</version>
                 <executions>
                     <execution>
                         <id>copy-dependencies</id>
@@ -69,5 +69,12 @@
             </plugin>
         </plugins>
     </build>
+	
+    <properties>
+        <dependency.plugin.version>3.1.1</dependency.plugin.version>
+        <compiler.plugin.version>3.8.0</compiler.plugin.version>
+        <source.version>1.8</source.version>
+        <target.version>1.8</target.version>
+    </properties>
 
 </project>

core-kotlin-2/src/test/kotlin/com/baeldung/sequences/SequencesTest.kt

@@ -0,0 +1,54 @@
+package com.baeldung.sequeces
+
+import org.junit.Test
+import kotlin.test.assertEquals
+import java.time.Instant
+
+class SequencesTest {
+
+    @Test
+    fun shouldBuildSequenceWhenUsingFromElements() {
+        val seqOfElements = sequenceOf("first" ,"second", "third")
+                .toList()
+        assertEquals(3, seqOfElements.count())
+    }
+
+    @Test
+    fun shouldBuildSequenceWhenUsingFromFunction() {
+        val seqFromFunction = generateSequence(Instant.now()) {it.plusSeconds(1)}
+                .take(3)
+                .toList()
+        assertEquals(3, seqFromFunction.count())
+    }
+
+    @Test
+    fun shouldBuildSequenceWhenUsingFromChunks() {
+        val seqFromChunks = sequence {
+            yield(1)
+            yieldAll((2..5).toList())
+        }.toList()
+        assertEquals(5, seqFromChunks.count())
+    }
+
+    @Test
+    fun shouldBuildSequenceWhenUsingFromCollection() {
+        val seqFromIterable = (1..10)
+                .asSequence()
+                .toList()
+        assertEquals(10, seqFromIterable.count())
+    }
+
+    @Test
+    fun shouldShowNoCountDiffWhenUsingWithAndWithoutSequence() {
+        val withSequence = (1..10).asSequence()
+                .filter{it % 2 == 1}
+                .map { it * 2 }
+                .toList()
+        val withoutSequence = (1..10)
+                .filter{it % 2 == 1}
+                .map { it * 2 }
+                .toList()
+        assertEquals(withSequence.count(), withoutSequence.count())
+    }
+
+}

core-scala/pom.xml

@@ -28,7 +28,7 @@
             <plugin>
                 <groupId>net.alchim31.maven</groupId>
                 <artifactId>scala-maven-plugin</artifactId>
-                <version>3.3.2</version>
+                <version>${scala.plugin.version}</version>
                 <executions>
                     <execution>
                         <goals>
@@ -49,6 +49,7 @@
 
     <properties>
         <scala.version>2.12.7</scala.version>
+        <scala.plugin.version>3.3.2</scala.plugin.version>
     </properties>
 </project>
 

deeplearning4j/pom.xml

@@ -44,12 +44,13 @@
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
             <artifactId>httpclient</artifactId>
-            <version>4.3.5</version>
+            <version>${httpclient.version}</version>
         </dependency>
     </dependencies>
 
     <properties>
         <dl4j.version>0.9.1</dl4j.version> <!-- Latest non beta version -->
+        <httpclient.version>4.3.5</httpclient.version>
     </properties>
 
 </project>

ethereum/pom.xml

@@ -175,10 +175,10 @@
         <plugins>
             <plugin>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.1</version>
+                <version>${compiler.plugin.version}</version>
                 <configuration>
-                    <source>1.8</source>
+                    <source>${source.version}</source>
-                    <target>1.8</target>
+                    <target>${target.version}</target>
                 </configuration>
             </plugin>
             <plugin>
@@ -215,5 +215,8 @@
         <logback.version>1.2.3</logback.version>
         <slf4j.version>1.7.25</slf4j.version>
         <spring-boot-maven-plugin.version>2.0.4.RELEASE</spring-boot-maven-plugin.version>
+        <compiler.plugin.version>3.1</compiler.plugin.version>
+        <source.version>1.8</source.version>
+        <target.version>1.8</target.version>
     </properties>
 </project>

google-web-toolkit/pom.xml

@@ -63,7 +63,7 @@
             <plugin>
                 <groupId>net.ltgt.gwt.maven</groupId>
                 <artifactId>gwt-maven-plugin</artifactId>
-                <version>1.0-rc-8</version>
+                <version>${gwt.plugin.version}</version>
                 <executions>
                     <execution>
                         <goals>
@@ -78,7 +78,7 @@
                     <failOnError>true</failOnError>
                     <!-- GWT compiler 2.8 requires 1.8, hence define sourceLevel here if
                         you use a different source language for java compilation -->
-                    <sourceLevel>1.8</sourceLevel>
+                    <sourceLevel>${maven.compiler.source}</sourceLevel>
                     <!-- Compiler configuration -->
                     <compilerArgs>
                         <!-- Ask GWT to create the Story of Your Compile (SOYC) (gwt:compile) -->
@@ -98,7 +98,7 @@
             <!-- Skip normal test execution, we use gwt:test instead -->
             <plugin>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.17</version>
+                <version>${surefire.plugin.version}</version>
                 <configuration>
                     <skip>true</skip>
                 </configuration>
@@ -119,6 +119,8 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <gwt.version>2.8.2</gwt.version>
+        <gwt.plugin.version>1.0-rc-8</gwt.plugin.version>
+        <surefire.plugin.version>2.17</surefire.plugin.version>
     </properties>
 
 </project>

guest/core-kotlin/pom.xml

@@ -46,19 +46,19 @@
         <dependency>
             <groupId>org.jetbrains.spek</groupId>
             <artifactId>spek-api</artifactId>
-            <version>1.1.5</version>
+            <version>${spek.api.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.jetbrains.spek</groupId>
             <artifactId>spek-subject-extension</artifactId>
-            <version>1.1.5</version>
+            <version>${spek.subject.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.jetbrains.spek</groupId>
             <artifactId>spek-junit-platform-engine</artifactId>
-            <version>1.1.5</version>
+            <version>${spek.junit.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -195,6 +195,9 @@
         <junit.vintage.version>5.2.0</junit.vintage.version>
         <assertj.version>3.10.0</assertj.version>
         <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
+        <spek.api.version>1.1.5</spek.api.version>
+        <spek.subject.version>1.1.5</spek.subject.version>
+        <spek.junit.version>1.1.5</spek.junit.version>
     </properties>
 
 </project>

intelliJ/remote-debugging/pom.xml

@@ -16,6 +16,7 @@
 
     <properties>
         <java.version>1.8</java.version>
+        <awaitility.version>3.1.2</awaitility.version>
     </properties>
 
     <dependencies>
@@ -31,7 +32,7 @@
         <dependency>
             <groupId>org.awaitility</groupId>
             <artifactId>awaitility</artifactId>
-            <version>3.1.2</version>
+            <version>${awaitility.version}</version>
             <scope>test</scope>
         </dependency>
     </dependencies>

java-ee-8-security-api/app-auth-form-store-ldap/pom.xml

@@ -12,12 +12,16 @@
         <artifactId>java-ee-8-security-api</artifactId>
         <version>1.0-SNAPSHOT</version>
     </parent>
+	
+    <properties>
+        <unboundid.ldapsdk.version>4.0.4</unboundid.ldapsdk.version>
+    </properties>
 
     <dependencies>
         <dependency>
             <groupId>com.unboundid</groupId>
             <artifactId>unboundid-ldapsdk</artifactId>
-            <version>4.0.4</version>
+            <version>${unboundid.ldapsdk.version}</version>
         </dependency>
     </dependencies>
 

java-numbers-2/pom.xml

@@ -21,6 +21,11 @@
             <artifactId>jmh-generator-annprocess</artifactId>
             <version>${jmh-generator.version}</version>
         </dependency>
+        <dependency>
+            <groupId>it.unimi.dsi</groupId>
+            <artifactId>dsiutils</artifactId>
+            <version>${dsiutils.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -33,4 +38,8 @@
         </resources>
     </build>
 
+    <properties>
+        <dsiutils.version>2.6.0</dsiutils.version>
+    </properties>
+
 </project>

java-numbers-2/src/main/java/com/baeldung/algorithms/primechecker/BruteForcePrimeChecker.java

@@ -7,7 +7,7 @@ public class BruteForcePrimeChecker implements PrimeChecker<Integer> {
     @Override
     public boolean isPrime(Integer number) {
 
-        return number > 2 ? IntStream.range(2, number)
+        return number > 1 ? IntStream.range(2, number)
             .noneMatch(n -> (number % n == 0)) : false;
     }
 

java-numbers-2/src/main/java/com/baeldung/algorithms/primechecker/OptimisedPrimeChecker.java

@@ -6,7 +6,7 @@ public class OptimisedPrimeChecker implements PrimeChecker<Integer> {
 
     @Override
     public boolean isPrime(Integer number) {
-        return number > 2 ? IntStream.rangeClosed(2, (int) Math.sqrt(number))
+        return number > 1 ? IntStream.rangeClosed(2, (int) Math.sqrt(number))
             .noneMatch(n -> (number % n == 0)) : false;
     }
 

java-numbers-2/src/test/java/com/baeldung/algorithms/primechecker/PrimeCheckerUnitTest.java

@@ -11,22 +11,24 @@ public class PrimeCheckerUnitTest {
 
     @Test
     public void whenCheckIsPrime_thenTrue() {
-        assertTrue(primeChecker.isPrime(13l));
+        assertTrue(primeChecker.isPrime(2L));
+        assertTrue(primeChecker.isPrime(13L));
         assertTrue(primeChecker.isPrime(1009L));
         assertTrue(primeChecker.isPrime(74207281L));
     }
 
     @Test
     public void whenCheckIsPrime_thenFalse() {
-        assertTrue(!primeChecker.isPrime(50L));
+        assertFalse(primeChecker.isPrime(50L));
-        assertTrue(!primeChecker.isPrime(1001L));
+        assertFalse(primeChecker.isPrime(1001L));
-        assertTrue(!primeChecker.isPrime(74207282L));
+        assertFalse(primeChecker.isPrime(74207282L));
     }
 
     private final BruteForcePrimeChecker bfPrimeChecker = new BruteForcePrimeChecker();
 
     @Test
     public void whenBFCheckIsPrime_thenTrue() {
+        assertTrue(bfPrimeChecker.isPrime(2));
         assertTrue(bfPrimeChecker.isPrime(13));
         assertTrue(bfPrimeChecker.isPrime(1009));
     }
@@ -41,6 +43,7 @@ public class PrimeCheckerUnitTest {
 
     @Test
     public void whenOptCheckIsPrime_thenTrue() {
+        assertTrue(optimisedPrimeChecker.isPrime(2));
         assertTrue(optimisedPrimeChecker.isPrime(13));
         assertTrue(optimisedPrimeChecker.isPrime(1009));
     }
@@ -55,6 +58,7 @@ public class PrimeCheckerUnitTest {
 
     @Test
     public void whenPrimesCheckIsPrime_thenTrue() {
+        assertTrue(primesPrimeChecker.isPrime(2));
         assertTrue(primesPrimeChecker.isPrime(13));
         assertTrue(primesPrimeChecker.isPrime(1009));
     }

jee-7/pom.xml

@@ -118,7 +118,7 @@
         <dependency>
             <groupId>javax.mvc</groupId>
             <artifactId>javax.mvc-api</artifactId>
-            <version>20160715</version>
+            <version>${mvc.api.version}</version>
         </dependency>
         <dependency>
             <groupId>org.glassfish.ozark</groupId>
@@ -215,7 +215,7 @@
                 <plugin>
                     <groupId>org.eclipse.m2e</groupId>
                     <artifactId>lifecycle-mapping</artifactId>
-                    <version>1.0.0</version>
+                    <version>${lifecycle.mapping.version}</version>
                     <configuration>
                         <lifecycleMappingMetadata>
                             <pluginExecutions>
@@ -506,6 +506,8 @@
     </repositories>
 
     <properties>
+        <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
+        <mvc.api.version>20160715</mvc.api.version>
         <java.min.version>1.8</java.min.version>
         <maven.min.version>3.0.0</maven.min.version>
         <javaee_api.version>7.0</javaee_api.version>

jee-kotlin/pom.xml

@@ -253,7 +253,7 @@
                 <dependency>
                     <groupId>org.wildfly.arquillian</groupId>
                     <artifactId>wildfly-arquillian-container-remote</artifactId>
-                    <version>2.2.0.Final</version>
+                    <version>${wildfly.arquillian.version}</version>
                     <scope>test</scope>
                 </dependency>
             </dependencies>
@@ -261,6 +261,7 @@
     </profiles>
 
     <properties>
+        <wildfly.arquillian.version>2.2.0.Final</wildfly.arquillian.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <failOnMissingWebXml>false</failOnMissingWebXml>
         <javaee-api.version>8.0</javaee-api.version>

jhipster/jhipster-microservice/car-app/pom.xml

@@ -17,6 +17,7 @@
     </prerequisites>
 
     <properties>
+        <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
         <argLine>-Djava.security.egd=file:/dev/./urandom -Xmx256m</argLine>
         <assertj.version>3.6.2</assertj.version>
         <awaitility.version>2.0.0</awaitility.version>
@@ -433,7 +434,7 @@
                 <plugin>
                     <groupId>org.eclipse.m2e</groupId>
                     <artifactId>lifecycle-mapping</artifactId>
-                    <version>1.0.0</version>
+                    <version>${lifecycle.mapping.version}</version>
                     <configuration>
                         <lifecycleMappingMetadata>
                             <pluginExecutions>

jhipster/jhipster-microservice/dealer-app/pom.xml

@@ -92,6 +92,7 @@
         <undertow.version>1.4.10.Final</undertow.version>
         <validation-api.version>1.1.0.Final</validation-api.version>
         <yarn.version>v0.21.3</yarn.version>
+        <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
     </properties>
 
     <dependencyManagement>
@@ -427,7 +428,7 @@
                 <plugin>
                     <groupId>org.eclipse.m2e</groupId>
                     <artifactId>lifecycle-mapping</artifactId>
-                    <version>1.0.0</version>
+                    <version>${lifecycle.mapping.version}</version>
                     <configuration>
                         <lifecycleMappingMetadata>
                             <pluginExecutions>

jhipster/jhipster-microservice/gateway-app/pom.xml

@@ -96,6 +96,7 @@
         <undertow.version>1.4.10.Final</undertow.version>
         <validation-api.version>1.1.0.Final</validation-api.version>
         <yarn.version>v0.21.3</yarn.version>
+        <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
     </properties>
 
     <dependencyManagement>
@@ -469,7 +470,7 @@
                 <plugin>
                     <groupId>org.eclipse.m2e</groupId>
                     <artifactId>lifecycle-mapping</artifactId>
-                    <version>1.0.0</version>
+                    <version>${lifecycle.mapping.version}</version>
                     <configuration>
                         <lifecycleMappingMetadata>
                             <pluginExecutions>

jhipster/jhipster-monolithic/pom.xml

@@ -302,7 +302,7 @@
                 <plugin>
                     <groupId>org.eclipse.m2e</groupId>
                     <artifactId>lifecycle-mapping</artifactId>
-                    <version>1.0.0</version>
+                    <version>${lifecycle.mapping.version}</version>
                     <configuration>
                         <lifecycleMappingMetadata>
                             <pluginExecutions>
@@ -398,8 +398,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>${maven-compiler-plugin.version}</version>
                 <configuration>
-                    <source>1.8</source>
+                    <source>${source.version}</source>
-                    <target>1.8</target>
+                    <target>${target.version}</target>
                     <annotationProcessorPaths>
                         <path>
                             <groupId>org.mapstruct</groupId>
@@ -881,6 +881,9 @@
     </profiles>
 
     <properties>
+        <source.version>1.8</source.version>
+        <target.version>1.8</target.version>
+        <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
         <argLine>-Djava.security.egd=file:/dev/./urandom -Xmx256m</argLine>
         <assertj.version>3.6.2</assertj.version>
         <awaitility.version>2.0.0</awaitility.version>

jhipster/jhipster-uaa/gateway/pom.xml

@@ -236,7 +236,7 @@
         <dependency>
             <groupId>org.zalando</groupId>
             <artifactId>problem-spring-web</artifactId>
-            <version>0.24.0-RC.0</version>
+            <version>${spring.web.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.security.oauth</groupId>
@@ -559,7 +559,7 @@
                 <plugin>
                     <groupId>org.eclipse.m2e</groupId>
                     <artifactId>lifecycle-mapping</artifactId>
-                    <version>1.0.0</version>
+                    <version>${lifecycle.mapping.version}</version>
                     <configuration>
                         <lifecycleMappingMetadata>
                             <pluginExecutions>
@@ -1012,6 +1012,8 @@
     </profiles>
 	
     <properties>
+        <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
+        <spring.web.version>0.24.0-RC.0</spring.web.version>
         <!-- Build properties -->
         <maven.version>3.0.0</maven.version>
         <java.version>1.8</java.version>

jhipster/jhipster-uaa/uaa/pom.xml

@@ -232,7 +232,7 @@
         <dependency>
             <groupId>org.zalando</groupId>
             <artifactId>problem-spring-web</artifactId>
-            <version>0.24.0-RC.0</version>
+            <version>${spring.web.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.security.oauth</groupId>
@@ -543,7 +543,7 @@
                 <plugin>
                     <groupId>org.eclipse.m2e</groupId>
                     <artifactId>lifecycle-mapping</artifactId>
-                    <version>1.0.0</version>
+                    <version>${lifecycle.mapping.version}</version>
                     <configuration>
                         <lifecycleMappingMetadata>
                             <pluginExecutions>
@@ -834,6 +834,8 @@
     </profiles>
 	
     <properties>
+        <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
+        <spring.web.version>0.24.0-RC.0</spring.web.version>
         <!-- Build properties -->
         <maven.version>3.0.0</maven.version>
         <java.version>1.8</java.version>

kotlin-libraries/pom.xml

@@ -33,19 +33,19 @@
         <dependency>
             <groupId>org.jetbrains.spek</groupId>
             <artifactId>spek-api</artifactId>
-            <version>1.1.5</version>
+            <version>${spek.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.jetbrains.spek</groupId>
             <artifactId>spek-subject-extension</artifactId>
-            <version>1.1.5</version>
+            <version>${spek.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.jetbrains.spek</groupId>
             <artifactId>spek-junit-platform-engine</artifactId>
-            <version>1.1.5</version>
+            <version>${spek.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -166,6 +166,7 @@
         <objenesis.version>2.6</objenesis.version>
         <rxkotlin.version>2.3.0</rxkotlin.version>
         <arrow-core.version>0.7.3</arrow-core.version>
+        <spek.version>1.1.5</spek.version>
     </properties>
 
 </project>

kotlin-quasar/pom.xml

@@ -103,7 +103,7 @@
             </plugin>
             <plugin>
                 <artifactId>maven-dependency-plugin</artifactId>
-                <version>3.1.1</version>
+                <version>${dependency.plugin.version}</version>
                 <executions>
                     <execution>
                         <id>getClasspathFilenames</id>
@@ -116,7 +116,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.22.1</version>
+                <version>${surefire.plugin.version}</version>
                 <configuration>
                     <argLine>-Dco.paralleluniverse.fibers.verifyInstrumentation=true</argLine>
                     <argLine>-javaagent:${co.paralleluniverse:quasar-core:jar}</argLine>
@@ -125,7 +125,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>exec-maven-plugin</artifactId>
-                <version>1.3.2</version>
+                <version>${exec.plugin.version}</version>
                 <configuration>
                     <workingDirectory>target/classes</workingDirectory>
                     <executable>echo</executable>
@@ -145,6 +145,9 @@
         <kotlin.version>1.3.31</kotlin.version>
         <org.slf4j.version>1.7.21</org.slf4j.version>
         <logback.version>1.1.7</logback.version>
+        <dependency.plugin.version>3.1.1</dependency.plugin.version> 
+        <surefire.plugin.version>2.22.1</surefire.plugin.version>
+        <exec.plugin.version>1.3.2</exec.plugin.version>
     </properties>
 
 </project>

libraries-data-db/pom.xml

@@ -183,7 +183,7 @@
             <plugin>
                 <groupId>io.ebean</groupId>
                 <artifactId>ebean-maven-plugin</artifactId>
-                <version>11.11.2</version>
+                <version>${ebean.plugin.version}</version>
                 <executions>
                     <!-- enhance main classes -->
                     <execution>
@@ -202,6 +202,7 @@
     </build>
 
     <properties>
+        <ebean.plugin.version>11.11.2</ebean.plugin.version>
         <reladomo.version>16.5.1</reladomo.version>
         <build-helper-maven-plugin.version>3.0.0</build-helper-maven-plugin.version>
         <maven-antrun-plugin.version>1.8</maven-antrun-plugin.version>

libraries-data/pom.xml

@@ -74,19 +74,19 @@
         <dependency>
             <groupId>commons-cli</groupId>
             <artifactId>commons-cli</artifactId>
-            <version>1.2</version>
+            <version>${commons.cli.version}</version>
             <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>commons-io</groupId>
             <artifactId>commons-io</artifactId>
-            <version>2.1</version>
+            <version>${commons.io.version}</version>
             <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>commons-httpclient</groupId>
             <artifactId>commons-httpclient</artifactId>
-            <version>3.0.1</version>
+            <version>${httpclient.version}</version>
             <scope>provided</scope>
             <exclusions>
                 <exclusion>
@@ -133,7 +133,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-assembly-plugin</artifactId>
-                <version>2.3</version>
+                <version>${assembly.plugin.version}</version>
                 <configuration>
                     <descriptors>
                         <descriptor>src/main/resources/assembly/hadoop-job.xml</descriptor>
@@ -158,6 +158,10 @@
     </build>
 
     <properties>
+        <assembly.plugin.version>2.3</assembly.plugin.version>
+        <commons.cli.version>1.2</commons.cli.version>
+        <commons.io.version>2.1</commons.io.version>
+        <httpclient.version>3.0.1</httpclient.version>
         <storm.version>1.2.2</storm.version>
         <kafka.version>1.0.0</kafka.version>
         <ignite.version>2.4.0</ignite.version>

libraries-http/pom.xml

@@ -71,7 +71,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.5</version>
+            <version>${gson.version}</version>
         </dependency>
 
         <dependency>
@@ -116,6 +116,7 @@
     </dependencies>
 
     <properties>
+        <gson.version>2.8.5</gson.version>
         <httpclient.version>4.5.3</httpclient.version>
         <jackson.version>2.9.8</jackson.version>
         <assertj.version>3.6.2</assertj.version>

libraries-testing/pom.xml

@@ -127,7 +127,7 @@
         <dependency>
             <groupId>org.asciidoctor</groupId>
             <artifactId>asciidoctor-maven-plugin</artifactId>
-            <version>1.5.7.1</version>
+            <version>${asciidoctor.version}</version>
         </dependency>
 
     </dependencies>
@@ -154,7 +154,8 @@
     </build>
 
     <properties>
-        <serenity.version>1.9.9</serenity.version>
+        <asciidoctor.version>1.5.7.1</asciidoctor.version>
+		<serenity.version>1.9.9</serenity.version>
         <serenity.jbehave.version>1.9.0</serenity.jbehave.version>
         <serenity.jira.version>1.9.0</serenity.jira.version>
         <serenity.plugin.version>1.9.27</serenity.plugin.version>

libraries/pom.xml

@@ -523,7 +523,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
-                <version>2.2</version>
+                <version>${shade.plugin.version}</version>
                 <executions>
                     <execution>
                         <phase>package</phase>
@@ -556,6 +556,7 @@
     </build>
 
     <properties>
+        <shade.plugin.version>2.2</shade.plugin.version>
         <multiverse.version>0.7.0</multiverse.version>
         <cglib.version>3.2.7</cglib.version>
         <javatuples.version>1.2</javatuples.version>

linux-bash/functions/src/main/bash/functions.sh

@@ -0,0 +1,208 @@
+#!/bin/bash
+
+# Subsection 2.1
+simple_function() {
+    for ((i=0;i<5;++i)) do
+        echo -n " "$i" ";
+    done
+}
+
+function simple_function_no_parantheses {
+    for ((i=0;i<5;++i)) do
+        echo -n " "$i" ";
+    done
+}
+
+function simple_for_loop()
+    for ((i=0;i<5;++i)) do
+        echo -n " "$i" ";
+    done
+
+function simple_comparison()
+    if [[ "$1" -lt 5 ]]; then
+        echo "$1 is smaller than 5"
+    else
+        echo "$1 is greater than 5"
+    fi
+
+# Subsection 2.2
+function simple_inputs() {
+    echo "This is the first argument [$1]"
+    echo "This is the second argument [$2]"
+    echo "Calling function with $# aruments"
+}
+
+# Subsection 2.3
+global_sum=0
+function global_sum_outputs() {
+    global_sum=$(($1+$2)) 
+}
+
+function cs_sum_outputs() {
+    sum=$(($1+$2))
+    echo $sum
+}
+
+# Subsection 2.4
+function arg_ref_sum_outputs() {
+    declare -n sum_ref=$3
+    sum_ref=$(($1+$2)) 
+}
+
+# Subsection 3.1
+variable="baeldung"
+function variable_scope2() {
+    echo "Variable inside function variable_scope2: [$variable]"
+    local variable="ipsum"
+}
+
+function variable_scope() {
+    local variable="lorem"
+    echo "Variable inside function variable_scope: [$variable]"
+    variable_scope2
+}
+
+# Subsection 3.2
+subshell_sum=0
+function simple_subshell_sum() (
+    subshell_sum=$(($1+$2))
+    echo "Value of sum in function with global variables: [$subshell_sum]"
+)
+
+function simple_subshell_ref_sum() (
+    declare -n sum_ref=$3
+    sum_ref=$(($1+$2))
+    echo "Value of sum in function with ref arguments: [$sum_ref]"
+)
+
+# Subsection 3.3
+function redirection_in() {
+    while read input;
+        do
+            echo "$input"
+        done
+} < infile
+
+function redirection_in_ps() {
+    read
+    while read -a input;
+        do
+            echo "User[${input[2]}]->File[${input[8]}]"
+        done
+} < <(ls -ll /)
+
+function redirection_out_ps() {
+    declare -a output=("baeldung" "lorem" "ipsum" "caracg")
+    for element in "${output[@]}"
+        do
+            echo "$element"
+        done
+} > >(grep "g")
+
+function redirection_out() {
+    declare -a output=("baeldung" "lorem" "ipsum")
+    for element in "${output[@]}"
+        do
+            echo "$element"
+        done
+} > outfile
+
+# Subsection 3.4
+function fibonnaci_recursion() {
+    argument=$1
+    if [[ "$argument" -eq 0 ]] || [[ "$argument" -eq 1 ]]; then
+        echo $argument
+    else
+        first=$(fibonnaci_recursion $(($argument-1)))
+        second=$(fibonnaci_recursion $(($argument-2)))
+        echo $(( $first + $second ))
+    fi 
+}
+
+# main menu entry point
+echo "****Functions samples menu*****"
+PS3="Your choice (1,2,3 etc.):"
+options=("function_definitions" "function_input_args" "function_outputs" \
+         "function_variables" "function_subshells" "function_redirections" \
+         "function_recursion" "quit")
+select option in "${options[@]}"
+do
+    case $option in
+        "function_definitions")
+            echo -e "\n"
+            echo "**Different ways to define a function**"
+            echo -e "No function keyword:"
+            simple_function
+            echo -e "\nNo function parantheses:"
+            simple_function_no_parantheses
+            echo -e "\nOmitting curly braces:"
+            simple_for_loop
+            echo -e "\n"
+            ;;
+        "function_input_args")
+            echo -e "\n"
+            echo "**Passing inputs to a function**"
+            simple_inputs lorem ipsum
+            echo -e "\n"
+            ;;
+        "function_outputs")
+            echo -e "\n"
+            echo "**Getting outputs from a function**"
+            global_sum_outputs 1 2
+            echo -e ">1+2 using global variables: [$global_sum]"
+            cs_sum=$(cs_sum_outputs 1 2)
+            echo -e ">1+2 using command substitution: [$cs_sum]"
+            arg_ref_sum_outputs 1 2 arg_ref_sum
+            echo -e ">1+2 using argument references: [$arg_ref_sum]"
+            echo -e "\n"
+            ;;
+        "function_variables")
+            echo -e "\n"
+            echo "**Overriding variable scopes**"
+            echo "Global value of variable: [$variable]"
+            variable_scope
+            echo -e "\n"
+            ;;
+        "function_subshells")
+            echo -e "\n"
+            echo "**Running function in subshell**"
+            echo "Global value of sum: [$subshell_sum]"
+            simple_subshell_sum 1 2
+            echo "Value of sum after subshell function with \
+global variables: [$subshell_sum]"
+            subshell_sum_arg_ref=0
+            simple_subshell_ref_sum 1 2 subshell_sum_arg_ref
+            echo "Value of sum after subshell function with \
+ref arguments: [$subshell_sum_arg_ref]"
+            echo -e "\n"
+            ;;
+        "function_redirections")
+            echo -e "\n"
+            echo "**Function redirections**"
+            echo -e ">Function input redirection from file:"
+            redirection_in
+            echo -e ">Function input redirection from command:"
+            redirection_in_ps
+            echo -e ">Function output redirection to file:"
+            redirection_out
+            cat outfile
+            echo -e ">Function output redirection to command:"
+            red_ps=$(redirection_out_ps)
+            echo "$red_ps"
+            echo -e "\n"
+            ;;
+        "function_recursion")
+            echo -e "\n"
+            echo "**Function recursion**"
+            fibo_res1=$(fibonnaci_recursion 7)
+            echo "The 7th Fibonnaci number: [$fibo_res1]"
+            fibo_res2=$(fibonnaci_recursion 15)
+            echo "The 15th Fibonnaci number: [$fibo_res2]"
+            echo -e "\n"
+            ;;
+        "quit")
+            break
+            ;;
+        *) echo "Invalid option";;
+    esac
+done

linux-bash/functions/src/main/bash/infile

@@ -0,0 +1,3 @@
+Honda  Insight  2010
+Honda  Element  2006
+Chevrolet  Avalanche  2002

logging-modules/flogger/pom.xml

@@ -15,26 +15,26 @@
         <dependency>
             <groupId>com.google.flogger</groupId>
             <artifactId>flogger</artifactId>
-            <version>0.4</version>
+            <version>${flogger.version}</version>
         </dependency>
 
         <dependency>
             <groupId>com.google.flogger</groupId>
             <artifactId>flogger-system-backend</artifactId>
-            <version>0.4</version>
+            <version>${flogger.version}</version>
             <scope>runtime</scope>
         </dependency>
 
         <dependency>
             <groupId>com.google.flogger</groupId>
             <artifactId>flogger-slf4j-backend</artifactId>
-            <version>0.4</version>
+            <version>${flogger.version}</version>
         </dependency>
 
         <dependency>
             <groupId>com.google.flogger</groupId>
             <artifactId>flogger-log4j-backend</artifactId>
-            <version>0.4</version>
+            <version>${flogger.version}</version>
             <exclusions>
                 <exclusion>
                     <groupId>com.sun.jmx</groupId>
@@ -54,13 +54,18 @@
         <dependency>
             <groupId>log4j</groupId>
             <artifactId>log4j</artifactId>
-            <version>1.2.17</version>
+            <version>${log4j.version}</version>
         </dependency>
         <dependency>
             <groupId>log4j</groupId>
             <artifactId>apache-log4j-extras</artifactId>
-            <version>1.2.17</version>
+            <version>${log4j.version}</version>
         </dependency>
     </dependencies>
 
+    <properties>
+        <flogger.version>0.4</flogger.version>
+        <log4j.version>1.2.17</log4j.version>
+	</properties>
+
 </project>

machine-learning/pom.xml

@@ -19,6 +19,15 @@
         <maven.compiler.target>1.7</maven.compiler.target>
         <kotlin.version>1.3.50</kotlin.version>
         <dl4j.version>0.9.1</dl4j.version>
+        <clean.plugin.version>3.1.0</clean.plugin.version>
+        <resources.plugin.version>3.0.2</resources.plugin.version>
+        <jar.plugin.version>3.0.2</jar.plugin.version>
+        <compiler.plugin.version>3.8.0</compiler.plugin.version>
+        <surefire.plugin.version>2.22.1</surefire.plugin.version>
+        <install.plugin.version>2.5.2</install.plugin.version>
+        <deploy.plugin.version>2.8.2</deploy.plugin.version>
+        <site.plugin.version>3.7.1</site.plugin.version>
+        <report.plugin.version>3.0.0</report.plugin.version>
     </properties>
 
     <dependencies>
@@ -63,41 +72,41 @@
                 <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
                 <plugin>
                     <artifactId>maven-clean-plugin</artifactId>
-                    <version>3.1.0</version>
+                    <version>${clean.plugin.version}</version>
                 </plugin>
                 <!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
                 <plugin>
                     <artifactId>maven-resources-plugin</artifactId>
-                    <version>3.0.2</version>
+                    <version>${resources.plugin.version}</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.8.0</version>
+                    <version>${compiler.plugin.version}</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-surefire-plugin</artifactId>
-                    <version>2.22.1</version>
+                    <version>${surefire.plugin.version}</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-jar-plugin</artifactId>
-                    <version>3.0.2</version>
+                    <version>${jar.plugin.version}</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-install-plugin</artifactId>
-                    <version>2.5.2</version>
+                    <version>${install.plugin.version}</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-deploy-plugin</artifactId>
-                    <version>2.8.2</version>
+                    <version>${deploy.plugin.version}</version>
                 </plugin>
                 <!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
                 <plugin>
                     <artifactId>maven-site-plugin</artifactId>
-                    <version>3.7.1</version>
+                    <version>${site.plugin.version}</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-project-info-reports-plugin</artifactId>
-                    <version>3.0.0</version>
+                    <version>${report.plugin.version}</version>
                 </plugin>
             </plugins>
         </pluginManagement>

maven-all/compiler-plugin-java-9/pom.xml

@@ -12,13 +12,19 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.0</version>
+                <version>${compiler.plugin.version}</version>
                 <configuration>
-                    <source>9</source>
+                    <source>${source.version}</source>
-                    <target>9</target>
+                    <target>${target.version}</target>
                 </configuration>
             </plugin>
         </plugins>
     </build>
 
+    <properties>
+        <compiler.plugin.version>3.8.0</compiler.plugin.version>
+        <source.version>9</source.version>
+        <target.version>9</target.version>
+	</properties>
+
 </project>

maven-all/maven-custom-plugin/usage-example/pom.xml

@@ -8,16 +8,21 @@
     <version>0.0.1-SNAPSHOT</version>
     <packaging>pom</packaging>
 
+    <properties>
+        <commons.lang3.version>3.9</commons.lang3.version>
+        <junit.version>4.12</junit.version>
+	</properties>
+
     <dependencies>
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
-            <version>3.9</version>
+            <version>${commons.lang3.version}</version>
         </dependency>
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.12</version>
+            <version>${junit.version}</version>
             <scope>test</scope>
         </dependency>
     </dependencies>

maven-all/maven-war-plugin/pom.xml

@@ -14,7 +14,7 @@
             <plugin>
                 <artifactId>maven-war-plugin</artifactId>
                 <!-- Update maven war plugin to 3.1.0 or higher -->
-                <version>3.1.0</version>
+                <version>${war.plugin.version}</version>
                 <configuration>
                     <!-- Set failOnMissingWebXml configuration for maven war plugin -->
                     <failOnMissingWebXml>false</failOnMissingWebXml>
@@ -26,6 +26,7 @@
     <!-- Set failOnMissingWebXml as false in properties section -->
     <properties>
         <failOnMissingWebXml>false</failOnMissingWebXml>
+        <war.plugin.version>3.1.0</war.plugin.version>
     </properties>
 
 </project>

maven-all/versions-maven-plugin/pom.xml

@@ -12,19 +12,19 @@
         <dependency>
             <groupId>commons-io</groupId>
             <artifactId>commons-io</artifactId>
-            <version>2.3</version>
+            <version>${commons.io.version}</version>
         </dependency>
 
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-collections4</artifactId>
-            <version>4.0</version>
+            <version>${commons.collections4.version}</version>
         </dependency>
 
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
-            <version>3.0</version>
+            <version>${commons.lang3.version}</version>
         </dependency>
 
         <dependency>
@@ -36,7 +36,7 @@
         <dependency>
             <groupId>commons-beanutils</groupId>
             <artifactId>commons-beanutils</artifactId>
-            <version>1.9.1</version>
+            <version>${commons.beanutils.version}</version>
         </dependency>
     </dependencies>
 
@@ -45,7 +45,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>versions-maven-plugin</artifactId>
-                <version>2.7</version>
+                <version>${versions.plugin.version}</version>
                 <configuration>
                     <excludes>
                         <exclude>org.apache.commons:commons-collections4</exclude>
@@ -71,6 +71,11 @@
 
     <properties>
         <commons-compress-version>1.15</commons-compress-version>
+        <commons.io.version>2.3</commons.io.version>
+        <versions.plugin.version>2.7</versions.plugin.version>
+        <commons.beanutils.version>1.9.1</commons.beanutils.version>
+        <commons.lang3.version>3.0</commons.lang3.version>
+        <commons.collections4.version>4.0</commons.collections4.version>
     </properties>
 
 </project>

maven-archetype/src/main/resources/archetype-resources/pom.xml

@@ -14,6 +14,8 @@
         <liberty-maven-plugin.version>${liberty-plugin-version}</liberty-maven-plugin.version>
         <defaultHttpPort>9080</defaultHttpPort>
         <defaultHttpsPort>9443</defaultHttpsPort>
+        <cdi.api.version>2.0</cdi.api.version>
+        <rsapi.api.version>2.1</rsapi.api.version>
     </properties>
 
     <build>
@@ -65,14 +67,14 @@
         <dependency>
             <groupId>javax.enterprise</groupId>
             <artifactId>cdi-api</artifactId>
-            <version>2.0</version>
+            <version>${cdi.api.version}</version>
             <scope>provided</scope>
         </dependency>
 
         <dependency>
             <groupId>javax.ws.rs</groupId>
             <artifactId>javax.ws.rs-api</artifactId>
-            <version>2.1</version>
+            <version>${rsapi.api.version}</version>
             <scope>provided</scope>
         </dependency>
 

maven-java-11/multimodule-maven-project/mainppmodule/pom.xml

@@ -12,23 +12,26 @@
         <groupId>com.baeldung.multimodule-maven-project</groupId>
         <artifactId>multimodule-maven-project</artifactId>
         <version>1.0</version>
+        <entitymodule.version>1.0</entitymodule.version>
+        <daomodule.version>1.0</daomodule.version>
+        <userdaomodule.version>1.0</userdaomodule.version>
     </parent>
 
     <dependencies>
         <dependency>
             <groupId>com.baeldung.entitymodule</groupId>
             <artifactId>entitymodule</artifactId>
-            <version>1.0</version>
+            <version>${entitymodule.version}</version>
         </dependency>
         <dependency>
             <groupId>com.baeldung.daomodule</groupId>
             <artifactId>daomodule</artifactId>
-            <version>1.0</version>
+            <version>${daomodule.version}</version>
         </dependency>
         <dependency>
             <groupId>com.baeldung.userdaomodule</groupId>
             <artifactId>userdaomodule</artifactId>
-            <version>1.0</version>
+            <version>${userdaomodule.version}</version>
         </dependency>
     </dependencies>
 

maven-java-11/multimodule-maven-project/pom.xml

@@ -26,13 +26,13 @@
             <dependency>
                 <groupId>junit</groupId>
                 <artifactId>junit</artifactId>
-                <version>4.12</version>
+                <version>${junit.version}</version>
                 <scope>test</scope>
             </dependency>
             <dependency>
                 <groupId>org.assertj</groupId>
                 <artifactId>assertj-core</artifactId>
-                <version>3.12.2</version>
+                <version>${assertj.version}</version>
                 <scope>test</scope>
             </dependency>
         </dependencies>
@@ -44,10 +44,10 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.8.0</version>
+                    <version>${compiler.plugin.version}</version>
                     <configuration>
-                        <source>11</source>
+                        <source>${source.version}</source>
-                        <target>11</target>
+                        <target>${target.version}</target>
                     </configuration>
                 </plugin>
             </plugins>
@@ -56,6 +56,11 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <junit.version>4.12</junit.version>
+        <assertj.version>3.12.2</assertj.version>
+        <compiler.plugin.version>3.8.0</compiler.plugin.version>
+        <source.version>11</source.version>
+        <target.version>11</target.version>
     </properties>
 
 </project>

maven-java-11/multimodule-maven-project/userdaomodule/pom.xml

@@ -14,16 +14,21 @@
         <version>1.0</version>
     </parent>
 
+    <properties>
+        <entitymodule.version>1.0</entitymodule.version>
+        <daomodule.version>1.0</daomodule.version>
+	</properties>
+
     <dependencies>
         <dependency>
             <groupId>com.baeldung.entitymodule</groupId>
             <artifactId>entitymodule</artifactId>
-            <version>1.0</version>
+            <version>${entitymodule.version}1.0</version>
         </dependency>
         <dependency>
             <groupId>com.baeldung.daomodule</groupId>
             <artifactId>daomodule</artifactId>
-            <version>1.0</version>
+            <version>${daomodule.version}</version>
         </dependency>
         <dependency>
             <groupId>junit</groupId>

maven-polyglot/maven-polyglot-json-extension/pom.xml

@@ -34,7 +34,7 @@
             <plugin>
                 <groupId>org.codehaus.plexus</groupId>
                 <artifactId>plexus-component-metadata</artifactId>
-                <version>1.7.1</version>
+                <version>${plexus.component.version}</version>
                 <executions>
                     <execution>
                         <goals>
@@ -48,6 +48,7 @@
 
     <properties>
         <maven-core.version>3.5.4</maven-core.version>
+        <plexus.component.version>1.7.1</plexus.component.version>
     </properties>
 
 </project>

micronaut/pom.xml

@@ -49,7 +49,7 @@
         <dependency>
             <groupId>javax.annotation</groupId>
             <artifactId>javax.annotation-api</artifactId>
-            <version>1.3.2</version>
+            <version>${annotation.api.version}</version>
             <scope>compile</scope>
         </dependency>
         <dependency>
@@ -60,19 +60,19 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
-            <version>1.2.3</version>
+            <version>${lombok.version}</version>
             <scope>runtime</scope>
         </dependency>
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.12</version>
+            <version>${junit.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>io.projectreactor</groupId>
             <artifactId>reactor-core</artifactId>
-            <version>3.1.6.RELEASE</version>
+            <version>${reactor.version}</version>
         </dependency>
     </dependencies>
 
@@ -81,7 +81,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
-                <version>3.1.0</version>
+                <version>${shade.plugin.version}</version>
                 <executions>
                     <execution>
                         <phase>package</phase>
@@ -102,7 +102,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>exec-maven-plugin</artifactId>
-                <version>1.6.0</version>
+                <version>${exec.plugin.version}</version>
                 <configuration>
                     <executable>java</executable>
                     <arguments>
@@ -118,7 +118,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.7.0</version>
+                    <version>${compiler.plugin.version}</version>
                     <configuration>
                         <source>${jdk.version}</source>
                         <target>${jdk.version}</target>
@@ -142,6 +142,13 @@
         <exec.mainClass>com.baeldung.micronaut.helloworld.server.ServerApplication</exec.mainClass>
         <micronaut.version>1.0.0.RC2</micronaut.version>
         <jdk.version>1.8</jdk.version>
+        <annotation.api.version>1.3.2</annotation.api.version>
+        <lombok.version>1.2.3</lombok.version>
+        <junit.version>4.12</junit.version>
+        <reactor.version>3.1.6.RELEASE</reactor.version>
+        <compiler.plugin.version>3.7.0</compiler.plugin.version>
+        <exec.plugin.version>1.6.0</exec.plugin.version>
+        <shade.plugin.version>3.1.0</shade.plugin.version>
     </properties>
 
 </project>

ninja/pom.xml

@@ -13,6 +13,9 @@
     <properties>
         <ninja.version>6.5.0</ninja.version>
         <jetty.version>9.4.18.v20190429</jetty.version>
+        <bootstrap.version>3.3.4</bootstrap.version>
+        <jquery.version>2.1.3</jquery.version>
+        <h2.version>1.4.186</h2.version>
     </properties>
 
     <build>
@@ -156,17 +159,17 @@
         <dependency>
             <groupId>org.webjars</groupId>
             <artifactId>bootstrap</artifactId>
-            <version>3.3.4</version>
+            <version>${bootstrap.version}</version>
         </dependency>
         <dependency>
             <groupId>org.webjars</groupId>
             <artifactId>jquery</artifactId>
-            <version>2.1.3</version>
+            <version>${jquery.version}</version>
         </dependency>
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
-            <version>1.4.186</version>
+            <version>${h2.version}</version>
         </dependency>
         <dependency>
             <groupId>org.ninjaframework</groupId>

persistence-modules/hibernate5-2/src/test/java/com/baeldung/hibernate/logging/HibernateLoggingIntegrationTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.hibernatelogging;
+package com.baeldung.hibernate.logging;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.fail;

pom.xml

@@ -814,7 +814,7 @@
                 <module>spring-rest-shell</module>
                 <module>spring-rest-simple</module>
                 <module>spring-resttemplate</module>
-                <module>spring-roo</module>
+<!--                <module>spring-roo</module>-->
                 <module>spring-scheduling</module>
                 <module>spring-security-modules/spring-security-acl</module>
                 <module>spring-security-modules/spring-security-angular/server</module>
@@ -1416,7 +1416,7 @@
                 <module>spring-rest-shell</module>
                 <module>spring-rest-simple</module>
                 <module>spring-resttemplate</module>
-                <module>spring-roo</module>
+<!--                <module>spring-roo</module>-->
 
                 <module>spring-scheduling</module>
                 <module>spring-security-modules/spring-security-acl</module>

spring-boot-properties/src/test/resources/configprops-test.properties

@@ -24,3 +24,5 @@ item.size=21
 #Additional properties
 additional.unit=km
 additional.max=100
+
+key.something=val

spring-boot-properties/src/test/resources/foo.properties

@@ -1 +1,2 @@
-foo=bar
+foo=bar
+key.something=val