Merge branch 'master' of https://github.com/eugenp/tutorials into public-access-modifier

algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/printtriangles/PrintTriangleExamples.java

@@ -4,7 +4,7 @@ import org.apache.commons.lang3.StringUtils;
 
 public class PrintTriangleExamples {
 
-    public static String printARightAngledTriangle(int N) {
+    public static String printARightTriangle(int N) {
         StringBuilder result = new StringBuilder();
         for (int r = 1; r <= N; r++) {
             for (int j = 1; j <= r; j++) {
@@ -29,6 +29,17 @@ public class PrintTriangleExamples {
         return result.toString();
     }
 
+    public static String printAnIsoscelesTriangleUsingStringUtils(int N) {
+        StringBuilder result = new StringBuilder();
+
+        for (int r = 1; r <= N; r++) {
+            result.append(StringUtils.repeat(' ', N - r));
+            result.append(StringUtils.repeat('*', 2 * r - 1));
+            result.append(System.lineSeparator());
+        }
+        return result.toString();
+    }
+
     public static String printAnIsoscelesTriangleUsingSubstring(int N) {
         StringBuilder result = new StringBuilder();
         String helperString = StringUtils.repeat(' ', N - 1) + StringUtils.repeat('*', N * 2 - 1);
@@ -41,8 +52,9 @@ public class PrintTriangleExamples {
     }
 
     public static void main(String[] args) {
-        System.out.println(printARightAngledTriangle(5));
+        System.out.println(printARightTriangle(5));
         System.out.println(printAnIsoscelesTriangle(5));
+        System.out.println(printAnIsoscelesTriangleUsingStringUtils(5));
         System.out.println(printAnIsoscelesTriangleUsingSubstring(5));
     }
 

algorithms-miscellaneous-3/src/test/java/com/baeldung/algorithms/printtriangles/PrintTriangleExamplesUnitTest.java

@@ -9,9 +9,9 @@ import static org.junit.Assert.assertEquals;
 
 @RunWith(JUnitParamsRunner.class)
 public class PrintTriangleExamplesUnitTest {
-    
-    private static Object[][] rightAngledTriangles() {
-        String expected0 = ""; 
+
+    private static Object[][] rightTriangles() {
+        String expected0 = "";
         
         String expected2 = "*" + System.lineSeparator() 
                          + "**" + System.lineSeparator();
@@ -39,9 +39,9 @@ public class PrintTriangleExamplesUnitTest {
     }
 
     @Test
-    @Parameters(method = "rightAngledTriangles")
-    public void whenPrintARightAngledTriangleIsCalled_ThenTheCorrectStringIsReturned(int nrOfRows, String expected) {
-        String actual = PrintTriangleExamples.printARightAngledTriangle(nrOfRows);
+    @Parameters(method = "rightTriangles")
+    public void whenPrintARightTriangleIsCalled_ThenTheCorrectStringIsReturned(int nrOfRows, String expected) {
+        String actual = PrintTriangleExamples.printARightTriangle(nrOfRows);
 
         assertEquals(expected, actual);
     }
@@ -81,6 +81,14 @@ public class PrintTriangleExamplesUnitTest {
 
         assertEquals(expected, actual);
     }
+
+    @Test
+    @Parameters(method = "isoscelesTriangles")
+    public void whenPrintAnIsoscelesTriangleUsingStringUtilsIsCalled_ThenTheCorrectStringIsReturned(int nrOfRows, String expected) {
+        String actual = PrintTriangleExamples.printAnIsoscelesTriangleUsingStringUtils(nrOfRows);
+
+        assertEquals(expected, actual);
+    }
     
     @Test
     @Parameters(method = "isoscelesTriangles")

algorithms-sorting/src/main/java/com/baeldung/algorithms/sort/bynumber/NaturalOrderComparators.java

@@ -1,4 +1,4 @@
-package com.baeldung.algorithms.stringsortingbynumber;
+package com.baeldung.algorithms.sort.bynumber;
 
 import java.util.Comparator;
 

algorithms-sorting/src/test/java/com/baeldung/algorithms/sort/bynumber/NaturalOrderComparatorsUnitTest.java

@@ -1,6 +1,6 @@
-package com.baeldung.algorithms.stringsortingbynumber;
+package com.baeldung.algorithms.sort.bynumber;
 
-import com.baeldung.algorithms.stringsortingbynumber.NaturalOrderComparators;
+import com.baeldung.algorithms.sort.bynumber.NaturalOrderComparators;
 import org.junit.Test;
 
 import java.util.ArrayList;

java-jdi/pom.xml

@@ -0,0 +1,130 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>java-jdi</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>java-jdi</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-java</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>log4j</groupId>
+            <artifactId>log4j</artifactId>
+            <version>${log4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+            <version>${logback.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh-core.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh-generator.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.sun</groupId>
+            <artifactId>tools</artifactId>
+            <version>${tools.version}</version>
+            <scope>system</scope>
+      		<systemPath>${java.home}/../lib/tools.jar</systemPath>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>java-jdi</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+        <plugins>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <version>${maven-javadoc-plugin.version}</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <profiles>
+        <profile>
+            <id>integration</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-surefire-plugin</artifactId>
+                        <executions>
+                            <execution>
+                                <phase>integration-test</phase>
+                                <goals>
+                                    <goal>test</goal>
+                                </goals>
+                                <configuration>
+                                    <includes>
+                                        <include>**/*IntegrationTest.java</include>
+                                    </includes>
+                                </configuration>
+                            </execution>
+                        </executions>
+                        <configuration>
+                            <systemPropertyVariables>
+                                <test.mime>json</test.mime>
+                            </systemPropertyVariables>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
+
+    <properties>
+        <commons-lang3.version>3.5</commons-lang3.version>
+
+        <assertj.version>3.6.1</assertj.version>
+		<tool.version>1.8</tool.version>
+        <org.slf4j.version>1.7.21</org.slf4j.version>
+        <logback.version>1.1.7</logback.version>
+		<tools.version>1.8</tools.version>
+        <maven-surefire-plugin.version>2.21.0</maven-surefire-plugin.version>
+        <maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
+        <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
+    </properties>
+</project>

java-jdi/src/main/java/com/baeldung/jdi/JDIExample.java

@@ -0,0 +1,14 @@
+package com.baeldung.jdi;
+
+public class JDIExample {
+
+    public static void main(String[] args) {
+        String jpda = "Java Platform Debugger Architecture";
+        System.out.println("Hi Everyone, Welcome to " + jpda); //add a break point here
+
+        String jdi = "Java Debug Interface"; //add a break point here and also stepping in here
+        String text = "Today, we'll dive into " + jdi;
+        System.out.println(text);
+    }
+    
+}

java-jdi/src/main/java/com/baeldung/jdi/JDIExampleDebugger.java

@@ -0,0 +1,171 @@
+package com.baeldung.jdi;
+
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.util.Map;
+
+import com.sun.jdi.AbsentInformationException;
+import com.sun.jdi.Bootstrap;
+import com.sun.jdi.ClassType;
+import com.sun.jdi.IncompatibleThreadStateException;
+import com.sun.jdi.LocalVariable;
+import com.sun.jdi.Location;
+import com.sun.jdi.StackFrame;
+import com.sun.jdi.VMDisconnectedException;
+import com.sun.jdi.Value;
+import com.sun.jdi.VirtualMachine;
+import com.sun.jdi.connect.Connector;
+import com.sun.jdi.connect.IllegalConnectorArgumentsException;
+import com.sun.jdi.connect.LaunchingConnector;
+import com.sun.jdi.connect.VMStartException;
+import com.sun.jdi.event.BreakpointEvent;
+import com.sun.jdi.event.ClassPrepareEvent;
+import com.sun.jdi.event.Event;
+import com.sun.jdi.event.EventSet;
+import com.sun.jdi.event.LocatableEvent;
+import com.sun.jdi.event.StepEvent;
+import com.sun.jdi.request.BreakpointRequest;
+import com.sun.jdi.request.ClassPrepareRequest;
+import com.sun.jdi.request.StepRequest;
+
+public class JDIExampleDebugger {
+
+    private Class debugClass; 
+    private int[] breakPointLines;
+
+    public Class getDebugClass() {
+        return debugClass;
+    }
+
+    public void setDebugClass(Class debugClass) {
+        this.debugClass = debugClass;
+    }
+
+    public int[] getBreakPointLines() {
+        return breakPointLines;
+    }
+
+    public void setBreakPointLines(int[] breakPointLines) {
+        this.breakPointLines = breakPointLines;
+    }
+
+    /**
+     * Sets the debug class as the main argument in the connector and launches the VM
+     * @return VirtualMachine
+     * @throws IOException
+     * @throws IllegalConnectorArgumentsException
+     * @throws VMStartException
+     */
+    public VirtualMachine connectAndLaunchVM() throws IOException, IllegalConnectorArgumentsException, VMStartException {
+        LaunchingConnector launchingConnector = Bootstrap.virtualMachineManager().defaultConnector();
+        Map<String, Connector.Argument> arguments = launchingConnector.defaultArguments();
+        arguments.get("main").setValue(debugClass.getName());
+        VirtualMachine vm = launchingConnector.launch(arguments);
+        return vm;
+    }
+
+    /**
+     * Creates a request to prepare the debug class, add filter as the debug class and enables it
+     * @param vm
+     */
+    public void enableClassPrepareRequest(VirtualMachine vm) {
+        ClassPrepareRequest classPrepareRequest = vm.eventRequestManager().createClassPrepareRequest();
+        classPrepareRequest.addClassFilter(debugClass.getName());
+        classPrepareRequest.enable();
+    }
+
+    /**
+     * Sets the break points at the line numbers mentioned in breakPointLines array
+     * @param vm
+     * @param event
+     * @throws AbsentInformationException
+     */
+    public void setBreakPoints(VirtualMachine vm, ClassPrepareEvent event) throws AbsentInformationException {
+        ClassType classType = (ClassType) event.referenceType();
+        for(int lineNumber: breakPointLines) {
+            Location location = classType.locationsOfLine(lineNumber).get(0);
+            BreakpointRequest bpReq = vm.eventRequestManager().createBreakpointRequest(location);
+            bpReq.enable();
+        }
+    }
+
+    /**
+     * Displays the visible variables
+     * @param event
+     * @throws IncompatibleThreadStateException
+     * @throws AbsentInformationException
+     */
+    public void displayVariables(LocatableEvent event) throws IncompatibleThreadStateException, AbsentInformationException {
+        StackFrame stackFrame = event.thread().frame(0);
+        if(stackFrame.location().toString().contains(debugClass.getName())) {
+            Map<LocalVariable, Value> visibleVariables = stackFrame.getValues(stackFrame.visibleVariables());
+            System.out.println("Variables at " +stackFrame.location().toString() +  " > ");
+            for (Map.Entry<LocalVariable, Value> entry : visibleVariables.entrySet()) {
+                System.out.println(entry.getKey().name() + " = " + entry.getValue());
+            }
+        }
+    }
+
+    /**
+     * Enables step request for a break point
+     * @param vm
+     * @param event
+     */
+    public void enableStepRequest(VirtualMachine vm, BreakpointEvent event) {
+        //enable step request for last break point
+        if(event.location().toString().contains(debugClass.getName()+":"+breakPointLines[breakPointLines.length-1])) {
+            StepRequest stepRequest = vm.eventRequestManager().createStepRequest(event.thread(), StepRequest.STEP_LINE, StepRequest.STEP_OVER);
+            stepRequest.enable();    
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+
+        JDIExampleDebugger debuggerInstance = new JDIExampleDebugger();
+        debuggerInstance.setDebugClass(JDIExample.class);
+        int[] breakPoints = {6, 9};
+        debuggerInstance.setBreakPointLines(breakPoints);
+        VirtualMachine vm = null;
+
+        try {
+            vm = debuggerInstance.connectAndLaunchVM();
+            debuggerInstance.enableClassPrepareRequest(vm);
+
+            EventSet eventSet = null;
+            while ((eventSet = vm.eventQueue().remove()) != null) {
+                for (Event event : eventSet) {
+                    if (event instanceof ClassPrepareEvent) {
+                        debuggerInstance.setBreakPoints(vm, (ClassPrepareEvent)event);
+                    }
+
+                    if (event instanceof BreakpointEvent) {
+                        event.request().disable();
+                        debuggerInstance.displayVariables((BreakpointEvent) event);
+                        debuggerInstance.enableStepRequest(vm, (BreakpointEvent)event);
+                    }
+
+                    if (event instanceof StepEvent) {
+                        debuggerInstance.displayVariables((StepEvent) event);
+                    }
+                    vm.resume();
+                }
+            }
+        } catch (VMDisconnectedException e) {
+            System.out.println("Virtual Machine is disconnected.");
+        } catch (Exception e) {
+            e.printStackTrace();
+        } 
+        finally {
+            InputStreamReader reader = new InputStreamReader(vm.process().getInputStream());
+            OutputStreamWriter writer = new OutputStreamWriter(System.out);
+            char[] buf = new char[512];
+
+            reader.read(buf);
+            writer.write(buf);
+            writer.flush();
+        }
+
+    }
+
+}

java-numbers-2/src/main/java/com/baeldung/lcm/BigIntegerLCM.java

@@ -0,0 +1,13 @@
+package com.baeldung.lcm;
+
+import java.math.BigInteger;
+
+public class BigIntegerLCM {
+
+    public static BigInteger lcm(BigInteger number1, BigInteger number2) {
+        BigInteger gcd = number1.gcd(number2);
+        BigInteger absProduct = number1.multiply(number2).abs();
+        return absProduct.divide(gcd);
+    }
+
+}

java-numbers-2/src/main/java/com/baeldung/lcm/EuclideanAlgorithm.java

@@ -0,0 +1,40 @@
+package com.baeldung.lcm;
+
+import java.util.Arrays;
+
+public class EuclideanAlgorithm {
+
+    public static int gcd(int number1, int number2) {
+        if (number1 == 0 || number2 == 0) {
+            return number1 + number2;
+        } else {
+            int absNumber1 = Math.abs(number1);
+            int absNumber2 = Math.abs(number2);
+            int biggerValue = Math.max(absNumber1, absNumber2);
+            int smallerValue = Math.min(absNumber1, absNumber2);
+            return gcd(biggerValue % smallerValue, smallerValue);
+        }
+    }
+
+    public static int lcm(int number1, int number2) {
+        if (number1 == 0 || number2 == 0)
+            return 0;
+        else {
+            int gcd = gcd(number1, number2);
+            return Math.abs(number1 * number2) / gcd;
+        }
+    }
+
+    public static int lcmForArray(int[] numbers) {
+        int lcm = numbers[0];
+        for (int i = 1; i <= numbers.length - 1; i++) {
+            lcm = lcm(lcm, numbers[i]);
+        }
+        return lcm;
+    }
+
+    public static int lcmByLambda(int... numbers) {
+        return Arrays.stream(numbers).reduce(1, (lcmSoFar, currentNumber) -> Math.abs(lcmSoFar * currentNumber) / gcd(lcmSoFar, currentNumber));
+    }
+
+}

java-numbers-2/src/main/java/com/baeldung/lcm/PrimeFactorizationAlgorithm.java

@@ -0,0 +1,42 @@
+package com.baeldung.lcm;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+public class PrimeFactorizationAlgorithm {
+
+    public static Map<Integer, Integer> getPrimeFactors(int number) {
+        int absNumber = Math.abs(number);
+        Map<Integer, Integer> primeFactorsMap = new HashMap<Integer, Integer>();
+        for (int factor = 2; factor <= absNumber; factor++) {
+            while (absNumber % factor == 0) {
+                Integer power = primeFactorsMap.get(factor);
+                if (power == null) {
+                    power = 0;
+                }
+                primeFactorsMap.put(factor, power + 1);
+                absNumber /= factor;
+            }
+        }
+        return primeFactorsMap;
+    }
+
+    public static int lcm(int number1, int number2) {
+        if (number1 == 0 || number2 == 0) {
+            return 0;
+        }
+        Map<Integer, Integer> primeFactorsForNum1 = getPrimeFactors(number1);
+        Map<Integer, Integer> primeFactorsForNum2 = getPrimeFactors(number2);
+        Set<Integer> primeFactorsUnionSet = new HashSet<Integer>(primeFactorsForNum1.keySet());
+        primeFactorsUnionSet.addAll(primeFactorsForNum2.keySet());
+        int lcm = 1;
+        for (Integer primeFactor : primeFactorsUnionSet) {
+            lcm *= Math.pow(primeFactor, Math.max(primeFactorsForNum1.getOrDefault(primeFactor, 0),
+                    primeFactorsForNum2.getOrDefault(primeFactor, 0)));
+        }
+        return lcm;
+    }
+
+}

java-numbers-2/src/main/java/com/baeldung/lcm/SimpleAlgorithm.java

@@ -0,0 +1,18 @@
+package com.baeldung.lcm;
+
+public class SimpleAlgorithm {
+    public static int lcm(int number1, int number2) {
+        if (number1 == 0 || number2 == 0) {
+            return 0;
+        }
+        int absNumber1 = Math.abs(number1);
+        int absNumber2 = Math.abs(number2);
+        int absHigherNumber = Math.max(absNumber1, absNumber2);
+        int absLowerNumber = Math.min(absNumber1, absNumber2);
+        int lcm = absHigherNumber;
+        while (lcm % absLowerNumber != 0) {
+            lcm += absHigherNumber;
+        }
+        return lcm;
+    }
+}

java-numbers-2/src/test/java/com/baeldung/lcm/BigIntegerLCMUnitTest.java

@@ -0,0 +1,18 @@
+package com.baeldung.lcm;
+
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.math.BigInteger;
+
+public class BigIntegerLCMUnitTest {
+
+    @Test
+    public void testLCM() {
+        BigInteger number1 = new BigInteger("12");
+        BigInteger number2 = new BigInteger("18");
+        BigInteger expectedLCM = new BigInteger("36");
+        Assert.assertEquals(expectedLCM, BigIntegerLCM.lcm(number1, number2));
+    }
+}

java-numbers-2/src/test/java/com/baeldung/lcm/EuclideanAlgorithmUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.lcm;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class EuclideanAlgorithmUnitTest {
+
+    @Test
+    public void testGCD() {
+        Assert.assertEquals(6, EuclideanAlgorithm.gcd(12, 18));
+    }
+
+    @Test
+    public void testLCM() {
+        Assert.assertEquals(36, EuclideanAlgorithm.lcm(12, 18));
+    }
+
+    @Test
+    public void testLCMForArray() {
+        Assert.assertEquals(15, EuclideanAlgorithm.lcmForArray(new int[]{3, 5, 15}));
+    }
+
+    @Test
+    public void testLCMByLambdaForArray() {
+        Assert.assertEquals(15, EuclideanAlgorithm.lcmByLambda(new int[]{3, 5, 15}));
+    }
+}

java-numbers-2/src/test/java/com/baeldung/lcm/PrimeFactorizationAlgorithmUnitTest.java

@@ -0,0 +1,30 @@
+package com.baeldung.lcm;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static com.baeldung.lcm.PrimeFactorizationAlgorithm.*;
+
+
+public class PrimeFactorizationAlgorithmUnitTest {
+
+    @Test
+    public void testGetPrimeFactors() {
+        Map<Integer, Integer> expectedPrimeFactorsMapForTwelve = new HashMap<>();
+        expectedPrimeFactorsMapForTwelve.put(2, 2);
+        expectedPrimeFactorsMapForTwelve.put(3, 1);
+        Map<Integer, Integer> expectedPrimeFactorsMapForEighteen = new HashMap<>();
+        expectedPrimeFactorsMapForEighteen.put(2, 1);
+        expectedPrimeFactorsMapForEighteen.put(3, 2);
+        Assert.assertEquals(expectedPrimeFactorsMapForTwelve, getPrimeFactors(12));
+        Assert.assertEquals(expectedPrimeFactorsMapForEighteen, getPrimeFactors(18));
+    }
+
+    @Test
+    public void testLCM() {
+        Assert.assertEquals(36, PrimeFactorizationAlgorithm.lcm(12, 18));
+    }
+}

java-numbers-2/src/test/java/com/baeldung/lcm/SimpleAlgorithmUnitTest.java

@@ -0,0 +1,15 @@
+package com.baeldung.lcm;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import static com.baeldung.lcm.SimpleAlgorithm.*;
+
+public class SimpleAlgorithmUnitTest {
+
+    @Test
+    public void testLCM() {
+        Assert.assertEquals(36, lcm(12, 18));
+    }
+
+}

metrics/pom.xml

@@ -86,6 +86,24 @@
             <version>${spectator-api.version}</version>
         </dependency>
 
+        <dependency>
+            <groupId>io.astefanutti.metrics.aspectj</groupId>
+            <artifactId>metrics-aspectj</artifactId>
+            <version>${metrics-aspectj.version}</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.slf4j</groupId>
+                    <artifactId>slf4j-api</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+
+        <dependency>
+            <groupId>io.astefanutti.metrics.aspectj</groupId>
+            <artifactId>metrics-aspectj-deps</artifactId>
+            <version>${metrics-aspectj.version}</version>
+        </dependency>
+
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
@@ -104,6 +122,7 @@
         <spectator-api.version>0.57.1</spectator-api.version>
 		<spring-boot-starter-web.version>2.0.7.RELEASE</spring-boot-starter-web.version>
 		<assertj-core.version>3.11.1</assertj-core.version>
+        <metrics-aspectj.version>1.1.0</metrics-aspectj.version>
     </properties>
 
 </project>

metrics/src/main/java/com/baeldung/metrics/aspectj/MetricsAspectJMain.java

@@ -0,0 +1,34 @@
+package com.baeldung.metrics.aspectj;
+
+import com.codahale.metrics.ConsoleReporter;
+import com.codahale.metrics.MetricRegistry;
+import com.codahale.metrics.SharedMetricRegistries;
+import java.io.PrintStream;
+import java.util.concurrent.TimeUnit;
+
+public class MetricsAspectJMain {
+    private static final MetricRegistry REGISTRY = new MetricRegistry();
+
+    public static void main(String args[]) throws InterruptedException {
+        startReport();
+
+        ObjectRunner runner = new ObjectRunner();
+
+        for (int i = 0; i < 5; i++) {
+            runner.run();
+        }
+
+        Thread.sleep(3000L);
+    }
+
+    private static void startReport() {
+        SharedMetricRegistries.add(ObjectRunner.REGISTRY_NAME, REGISTRY);
+
+        ConsoleReporter.forRegistry(REGISTRY)
+                .convertRatesTo(TimeUnit.SECONDS)
+                .convertDurationsTo(TimeUnit.MILLISECONDS)
+                .outputTo(new PrintStream(System.out))
+                .build()
+                .start(3, TimeUnit.SECONDS);
+    }
+}

metrics/src/main/java/com/baeldung/metrics/aspectj/ObjectRunner.java

@@ -0,0 +1,22 @@
+package com.baeldung.metrics.aspectj;
+
+import com.codahale.metrics.annotation.Timed;
+import io.astefanutti.metrics.aspectj.Metrics;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+@Metrics( registry = ObjectRunner.REGISTRY_NAME)
+public class ObjectRunner {
+
+    private static final Logger logger = LoggerFactory.getLogger(ObjectRunner.class);
+    public static final String REGISTRY_NAME = "ObjectRunner";
+
+    @Timed(name = "timerName")
+    public void run() {
+        logger.info("run");
+        try {
+            Thread.sleep(1000L);
+        } catch (InterruptedException e) {
+        }
+    }
+}

pom.xml

@@ -457,6 +457,7 @@
                 <module>java-collections-conversions</module>
                 <module>java-collections-maps</module>
                 <module>java-collections-maps-2</module>
+                <module>java-jdi</module>
                 <!-- <module>java-dates</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
                 <!-- <module>java-dates-2</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
                 <!-- <module>java-ee-8-security-api</module> --> <!-- long running -->
@@ -1156,6 +1157,7 @@
 				<module>java-collections-conversions</module>
 				<module>java-collections-maps</module>
 				<module>java-collections-maps-2</module>
+				<module>java-jdi</module>
 				<!-- <module>java-dates</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
 				<module>java-ee-8-security-api</module>
 				<module>java-lite</module>

spring-mvc-simple-2/src/main/java/com/baeldung/validation/listvalidation/SpringListValidationApplication.java

@@ -0,0 +1,17 @@
+package com.baeldung.validation.listvalidation;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@ComponentScan(basePackages = "com.baeldung.validation.listvalidation")
+@Configuration
+@SpringBootApplication
+public class SpringListValidationApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(SpringListValidationApplication.class, args);
+    }
+
+}

spring-mvc-simple-2/src/main/java/com/baeldung/validation/listvalidation/constraint/MaxSizeConstraint.java

@@ -0,0 +1,18 @@
+package com.baeldung.validation.listvalidation.constraint;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+import javax.validation.Constraint;
+import javax.validation.Payload;
+
+@Constraint(validatedBy = MaxSizeConstraintValidator.class)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface MaxSizeConstraint {
+
+    String message() default "The input list cannot contain more than 4 movies.";
+    
+    Class<?>[] groups() default {};
+    
+    Class<? extends Payload>[] payload() default {};
+}

spring-mvc-simple-2/src/main/java/com/baeldung/validation/listvalidation/constraint/MaxSizeConstraintValidator.java

@@ -0,0 +1,21 @@
+package com.baeldung.validation.listvalidation.constraint;
+
+import java.util.List;
+
+import javax.validation.ConstraintValidator;
+import javax.validation.ConstraintValidatorContext;
+
+import com.baeldung.validation.listvalidation.model.Movie;
+
+public class MaxSizeConstraintValidator implements ConstraintValidator<MaxSizeConstraint, List<Movie>> {
+
+    @Override
+    public boolean isValid(List<Movie> values, ConstraintValidatorContext context) {
+        boolean isValid = true;
+        if (values.size() > 4) {
+            isValid = false;
+        }
+        return isValid;
+    }
+
+}

spring-mvc-simple-2/src/main/java/com/baeldung/validation/listvalidation/controller/MovieController.java

@@ -0,0 +1,31 @@
+package com.baeldung.validation.listvalidation.controller;
+
+import java.util.List;
+
+import javax.validation.Valid;
+import javax.validation.constraints.NotEmpty;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.validation.listvalidation.constraint.MaxSizeConstraint;
+import com.baeldung.validation.listvalidation.model.Movie;
+import com.baeldung.validation.listvalidation.service.MovieService;
+
+@Validated
+@RestController
+@RequestMapping("/movies")
+public class MovieController {
+
+    @Autowired
+    private MovieService movieService;
+
+    @PostMapping
+    public void addAll(@RequestBody @NotEmpty(message = "Input movie list cannot be empty.") @MaxSizeConstraint List<@Valid Movie> movies) {
+        movieService.addAll(movies);
+    }
+}

spring-mvc-simple-2/src/main/java/com/baeldung/validation/listvalidation/exception/ConstraintViolationExceptionHandler.java

@@ -0,0 +1,36 @@
+package com.baeldung.validation.listvalidation.exception;
+
+import java.util.Set;
+
+import javax.validation.ConstraintViolation;
+import javax.validation.ConstraintViolationException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class ConstraintViolationExceptionHandler {
+    
+    private final Logger logger = LoggerFactory.getLogger(ConstraintViolationExceptionHandler.class);
+
+    @ExceptionHandler(ConstraintViolationException.class)
+    public ResponseEntity<String> handle(ConstraintViolationException constraintViolationException) {
+        Set<ConstraintViolation<?>> violations = constraintViolationException.getConstraintViolations();
+        String errorMessage = "";
+        if (!violations.isEmpty()) {
+            StringBuilder builder = new StringBuilder();
+            violations.forEach(violation -> builder.append("\n" + violation.getMessage()));
+            errorMessage = builder.toString();
+        } else {
+            errorMessage = "ConstraintViolationException occured.";
+        }
+
+        logger.error(errorMessage);
+        return new ResponseEntity<>(errorMessage, HttpStatus.BAD_REQUEST);
+    }
+
+}

spring-mvc-simple-2/src/main/java/com/baeldung/validation/listvalidation/model/Movie.java

@@ -0,0 +1,40 @@
+package com.baeldung.validation.listvalidation.model;
+
+import java.util.UUID;
+
+import javax.validation.constraints.NotEmpty;
+
+public class Movie {
+
+    private String id;
+
+    @NotEmpty(message = "Movie name cannot be empty.")
+    private String name;
+    
+    public Movie(String name) {
+        this.id = UUID.randomUUID()
+            .toString();
+        this.name = name;
+    }
+
+    public Movie(){
+
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+}

spring-mvc-simple-2/src/main/java/com/baeldung/validation/listvalidation/service/MovieService.java

@@ -0,0 +1,55 @@
+package com.baeldung.validation.listvalidation.service;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Service;
+
+import com.baeldung.validation.listvalidation.model.Movie;
+
+@Service
+public class MovieService {
+
+    private final Logger logger = LoggerFactory.getLogger(MovieService.class);
+
+    private static List<Movie> moviesData;
+
+    static {
+        moviesData = new ArrayList<>();
+
+        Movie m1 = new Movie("MovieABC");
+        moviesData.add(m1);
+
+        Movie m2 = new Movie("MovieDEF");
+        moviesData.add(m2);
+
+    }
+    
+    public Movie get(String name) {
+        Movie movie = null;
+        for (Movie m : moviesData) {
+            if (name.equalsIgnoreCase(m.getName())) {
+                movie = m;
+                logger.info("Found movie with name {} : {} ", name, movie);
+            }
+        }
+
+        return movie;
+    }
+
+    public void add(Movie movie) {
+        if (get(movie.getName()) == null) {
+            moviesData.add(movie);
+            logger.info("Added new movie - {}", movie.getName());
+        }
+    }
+
+    public void addAll(List<Movie> movies) {
+        for (Movie movie : movies) {
+            add(movie);
+        }
+    }
+
+}

spring-mvc-simple-2/src/test/java/com/baeldung/validation/listvalidation/MovieControllerIntegrationTest.java

@@ -0,0 +1,83 @@
+package com.baeldung.validation.listvalidation;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
+
+import com.baeldung.validation.listvalidation.model.Movie;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = SpringListValidationApplication.class)
+@AutoConfigureMockMvc
+public class MovieControllerIntegrationTest {
+
+    @Autowired
+    private MockMvc mvc;
+
+    ObjectMapper objectMapper = new ObjectMapper();
+    
+    @Test
+    public void givenValidMovieList_whenAddingMovieList_thenIsOK() throws Exception {
+        List<Movie> movies = new ArrayList<>();
+        Movie movie = new Movie("Movie3");
+        movies.add(movie);
+        mvc.perform(MockMvcRequestBuilders.post("/movies")
+            .contentType(MediaType.APPLICATION_JSON_UTF8)
+            .content(objectMapper.writeValueAsString(movies)))
+            .andExpect(MockMvcResultMatchers.status()
+                .isOk());
+    }
+    
+    @Test
+    public void givenEmptyMovieList_whenAddingMovieList_thenThrowBadRequest() throws Exception {
+        List<Movie> movies = new ArrayList<>();
+        mvc.perform(MockMvcRequestBuilders.post("/movies")
+            .contentType(MediaType.APPLICATION_JSON_UTF8)
+            .content(objectMapper.writeValueAsString(movies)))
+            .andExpect(MockMvcResultMatchers.status()
+                .isBadRequest());
+    }
+    
+    @Test
+    public void givenEmptyMovieName_whenAddingMovieList_thenThrowBadRequest() throws Exception {
+        Movie movie = new Movie("");
+        mvc.perform(MockMvcRequestBuilders.post("/movies")
+            .contentType(MediaType.APPLICATION_JSON_UTF8)
+            .content(objectMapper.writeValueAsString(Arrays.asList(movie))))
+            .andExpect(MockMvcResultMatchers.status()
+                .isBadRequest());
+    }
+    
+    @Test
+    public void given5MoviesInputList_whenAddingMovieList_thenThrowBadRequest() throws Exception {
+        Movie movie1 = new Movie("Movie1");
+        Movie movie2 = new Movie("Movie2");
+        Movie movie3 = new Movie("Movie3");
+        Movie movie4 = new Movie("Movie4");
+        Movie movie5 = new Movie("Movie5");
+        List<Movie> movies = new ArrayList<>();
+        movies.add(movie1);
+        movies.add(movie2);
+        movies.add(movie3);
+        movies.add(movie4);
+        movies.add(movie5);
+        mvc.perform(MockMvcRequestBuilders.post("/movies")
+            .contentType(MediaType.APPLICATION_JSON_UTF8)
+            .content(objectMapper.writeValueAsString(movies)))
+            .andExpect(MockMvcResultMatchers.status()
+                .isBadRequest());
+    }
+    
+}

spring-security-mvc-boot/pom.xml

@@ -7,7 +7,7 @@
     <artifactId>spring-security-mvc-boot</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <name>spring-security-mvc-boot</name>
-    <packaging>pom</packaging>
+    <packaging>war</packaging>
     <description>Spring Security MVC Boot</description>
 
     <parent>
@@ -46,6 +46,20 @@
             <groupId>org.springframework.security</groupId>
             <artifactId>spring-security-data</artifactId>
         </dependency>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.postgresql</groupId>
+            <artifactId>postgresql</artifactId>
+            <scope>runtime</scope>
+        </dependency>
         <dependency>
             <groupId>org.hamcrest</groupId>
             <artifactId>hamcrest-core</artifactId>
@@ -214,13 +228,22 @@
         </profile>
     </profiles>
 
-    <modules>
-        <module>spring-security-mvc-boot-default</module>
-        <module>spring-security-mvc-boot-mysql</module>
-        <module>spring-security-mvc-boot-postgre</module>
-    </modules>
 
     <properties>
+        <start-class>org.baeldung.custom.Application</start-class>
+        <!--If you want to run the example with the voters comment the tag 
+            above and uncomment the one below -->
+        <!--<start-class>org.baeldung.voter.VoterApplication</start-class> -->
+        <!--If you want to run the example with the multiple logins, comment 
+            the tag above and uncomment the one below -->
+        <!--<start-class>org.baeldung.multiplelogin.MultipleLoginApplication</start-class> -->
+        <!--If you want to run the example with the multiple http elements, 
+            comment the tag above and uncomment the one below -->
+        <!--<start-class>org.baeldung.multipleentrypoints.MultipleEntryPointsApplication</start-class> -->
+        <!--If you want to run the example with the Https enabled endpoints, 
+            comment the tag above and uncomment the one below -->
+        <!-- <start-class>org.baeldung.ssl.HttpsEnabledApplication</start-class> -->
+
         <taglibs-standard.version>1.1.2</taglibs-standard.version>
         <cargo-maven2-plugin.version>1.6.1</cargo-maven2-plugin.version>
         <ehcache-core.version>2.6.11</ehcache-core.version>

spring-security-mvc-boot/spring-security-mvc-boot-default/pom.xml

@@ -1,42 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <groupId>com.baeldung</groupId>
-    <artifactId>spring-security-mvc-boot-default</artifactId>
-    <version>0.0.1-SNAPSHOT</version>
-    <name>spring-security-mvc-boot-default</name>
-    <packaging>jar</packaging>
-    <description>Spring Security MVC Boot</description>
-
-    <parent>
-        <artifactId>spring-security-mvc-boot</artifactId>
-        <groupId>com.baeldung</groupId>
-        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../</relativePath>
-    </parent>
-
-    <dependencies>
-        <dependency>
-            <groupId>com.h2database</groupId>
-            <artifactId>h2</artifactId>
-        </dependency>
-    </dependencies>
-
-    <properties>
-        <start-class>org.baeldung.custom.Application</start-class>
-        <!--If you want to run the example with the voters comment the tag 
-            above and uncomment the one below -->
-        <!--<start-class>org.baeldung.voter.VoterApplication</start-class> -->
-        <!--If you want to run the example with the multiple logins, comment 
-            the tag above and uncomment the one below -->
-        <!--<start-class>org.baeldung.multiplelogin.MultipleLoginApplication</start-class> -->
-        <!--If you want to run the example with the multiple http elements, 
-            comment the tag above and uncomment the one below -->
-        <!--<start-class>org.baeldung.multipleentrypoints.MultipleEntryPointsApplication</start-class>-->
-        <!--If you want to run the example with the Https enabled endpoints,
-            comment the tag above and uncomment the one below -->
-       <!-- <start-class>org.baeldung.ssl.HttpsEnabledApplication</start-class> -->
-    </properties>
-
-</project>

spring-security-mvc-boot/spring-security-mvc-boot-mysql/pom.xml

@@ -1,28 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <groupId>com.baeldung</groupId>
-    <artifactId>spring-security-mvc-boot-mysql</artifactId>
-    <version>0.0.1-SNAPSHOT</version>
-    <name>spring-security-mvc-boot-mysql</name>
-    <packaging>jar</packaging>
-    <description>Spring Security MVC Boot using MySQL</description>
-
-    <parent>
-        <artifactId>spring-security-mvc-boot</artifactId>
-        <groupId>com.baeldung</groupId>
-        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>..</relativePath>
-    </parent>
-
-    <dependencies>
-        <dependency>
-            <groupId>mysql</groupId>
-            <artifactId>mysql-connector-java</artifactId>
-            <scope>runtime</scope>
-        </dependency>
-    </dependencies>
-
-</project>

spring-security-mvc-boot/spring-security-mvc-boot-postgre/pom.xml

@@ -1,28 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <groupId>com.baeldung</groupId>
-    <artifactId>spring-security-mvc-boot-postgre</artifactId>
-    <version>0.0.1-SNAPSHOT</version>
-    <name>spring-security-mvc-boot-postgre</name>
-    <packaging>jar</packaging>
-    <description>Spring Security MVC Boot using PostgreSQL</description>
-
-    <parent>
-        <artifactId>spring-security-mvc-boot</artifactId>
-        <groupId>com.baeldung</groupId>
-        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>..</relativePath>
-    </parent>
-
-    <dependencies>
-        <dependency>
-            <groupId>org.postgresql</groupId>
-            <artifactId>postgresql</artifactId>
-            <scope>runtime</scope>
-        </dependency>
-    </dependencies>
-
-</project>

spring-security-mvc-boot/spring-security-mvc-boot-postgre/src/test/java/com/baeldung/jdbcauthentication/postgre/SpringContextIntegrationTest.java

@@ -1,17 +0,0 @@
-package com.baeldung.jdbcauthentication.postgre;
-
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.test.context.junit4.SpringRunner;
-
-import com.baeldung.jdbcauthentication.postgre.PostgreJdbcAuthenticationApplication;
-
-@RunWith(SpringRunner.class)
-@SpringBootTest(classes = PostgreJdbcAuthenticationApplication.class)
-public class SpringContextIntegrationTest {
-
-    @Test
-    public void whenSpringContextIsBootstrapped_thenNoExceptions() {
-    }
-}

spring-security-mvc-boot/src/main/java/com/baeldung/AppConfig.java

@@ -18,7 +18,7 @@ import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
 
 @SpringBootApplication
-@PropertySource("classpath:persistence-h2.properties")
+@PropertySource({"classpath:persistence-h2.properties", "classpath:application-defaults.properties"})
 @EnableJpaRepositories(basePackages = { "com.baeldung.data.repositories" })
 @EnableWebMvc
 @Import(SpringSecurityConfig.class)

spring-security-mvc-boot/src/main/java/org/baeldung/custom/Application.java

@@ -3,8 +3,10 @@ package org.baeldung.custom;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
+import org.springframework.context.annotation.PropertySource;
 
 @SpringBootApplication
+@PropertySource("classpath:application-defaults.properties")
 public class Application extends SpringBootServletInitializer {
     public static void main(String[] args) {
         SpringApplication.run(Application.class, args);

spring-security-mvc-boot/src/main/java/org/baeldung/ip/IpApplication.java

@@ -3,8 +3,10 @@ package org.baeldung.ip;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
+import org.springframework.context.annotation.PropertySource;
 
 @SpringBootApplication
+@PropertySource("classpath:application-defaults.properties")
 public class IpApplication extends SpringBootServletInitializer {
     public static void main(String[] args) {
         SpringApplication.run(IpApplication.class, args);

spring-security-mvc-boot/src/main/java/org/baeldung/jdbcauthentication/h2/H2JdbcAuthenticationApplication.java

@@ -2,10 +2,12 @@ package org.baeldung.jdbcauthentication.h2;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.PropertySource;
 import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
 
 @SpringBootApplication
 @EnableWebSecurity
+@PropertySource("classpath:application-defaults.properties")
 public class H2JdbcAuthenticationApplication {
 
     public static void main(String[] args) {

spring-security-mvc-boot/src/main/java/org/baeldung/jdbcauthentication/mysql/MySqlJdbcAuthenticationApplication.java

@@ -1,9 +1,11 @@
-package com.baeldung.jdbcauthentication.mysql;
+package org.baeldung.jdbcauthentication.mysql;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.PropertySource;
 
 @SpringBootApplication
+@PropertySource("classpath:application-mysql.properties")
 public class MySqlJdbcAuthenticationApplication {
 
     public static void main(String[] args) {

spring-security-mvc-boot/src/main/java/org/baeldung/jdbcauthentication/mysql/config/SecurityConfiguration.java

@@ -1,4 +1,4 @@
-package com.baeldung.jdbcauthentication.mysql.config;
+package org.baeldung.jdbcauthentication.mysql.config;
 
 import javax.sql.DataSource;
 

spring-security-mvc-boot/src/main/java/org/baeldung/jdbcauthentication/mysql/web/UserController.java

@@ -1,4 +1,4 @@
-package com.baeldung.jdbcauthentication.mysql.web;
+package org.baeldung.jdbcauthentication.mysql.web;
 
 import java.security.Principal;
 

spring-security-mvc-boot/src/main/java/org/baeldung/jdbcauthentication/postgre/PostgreJdbcAuthenticationApplication.java

@@ -1,9 +1,11 @@
-package com.baeldung.jdbcauthentication.postgre;
+package org.baeldung.jdbcauthentication.postgre;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.PropertySource;
 
 @SpringBootApplication
+@PropertySource("classpath:application-postgre.properties")
 public class PostgreJdbcAuthenticationApplication {
 
     public static void main(String[] args) {

spring-security-mvc-boot/src/main/java/org/baeldung/jdbcauthentication/postgre/config/SecurityConfiguration.java

@@ -1,4 +1,4 @@
-package com.baeldung.jdbcauthentication.postgre.config;
+package org.baeldung.jdbcauthentication.postgre.config;
 
 import javax.sql.DataSource;
 

spring-security-mvc-boot/src/main/java/org/baeldung/jdbcauthentication/postgre/web/UserController.java

@@ -1,4 +1,4 @@
-package com.baeldung.jdbcauthentication.postgre.web;
+package org.baeldung.jdbcauthentication.postgre.web;
 
 import java.security.Principal;
 

spring-security-mvc-boot/src/main/java/org/baeldung/multipleauthproviders/MultipleAuthProvidersApplication.java

@@ -2,8 +2,10 @@ package org.baeldung.multipleauthproviders;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.PropertySource;
 
 @SpringBootApplication
+@PropertySource("classpath:application-defaults.properties")
 // @ImportResource({ "classpath*:spring-security-multiple-auth-providers.xml" })
 public class MultipleAuthProvidersApplication {
     public static void main(String[] args) {

spring-security-mvc-boot/src/main/java/org/baeldung/multipleentrypoints/MultipleEntryPointsApplication.java

@@ -2,8 +2,10 @@ package org.baeldung.multipleentrypoints;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.PropertySource;
 
 @SpringBootApplication
+@PropertySource("classpath:application-defaults.properties")
 // @ImportResource({"classpath*:spring-security-multiple-entry.xml"})
 public class MultipleEntryPointsApplication {
     public static void main(String[] args) {

spring-security-mvc-boot/src/main/java/org/baeldung/multiplelogin/MultipleLoginApplication.java

@@ -3,8 +3,10 @@ package org.baeldung.multiplelogin;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.PropertySource;
 
 @SpringBootApplication
+@PropertySource("classpath:application-defaults.properties")
 @ComponentScan("org.baeldung.multiplelogin")
 public class MultipleLoginApplication {
     public static void main(String[] args) {