From 3a4cddb740638446496efc906e2d71d2b0d74c4a Mon Sep 17 00:00:00 2001
From: Dassi Orleando <dassiorleando@DassiMacBook.local>
Date: Sat, 19 Aug 2017 20:41:55 +0100
Subject: [PATCH] Different types of bean injection in Spring

---
 pom.xml                                       |  1 +
 spring-types-bean-injection/README.md         |  3 +
 spring-types-bean-injection/pom.xml           | 81 +++++++++++++++++++
 .../java/com/baeldung/config/AppConfig.java   | 25 ++++++
 .../com/baeldung/service/MegaTestService.java | 22 +++++
 .../baeldung/service/SuperTestService.java    | 22 +++++
 .../com/baeldung/service/TestService.java     | 14 ++++
 .../MegaTestServiceIntegrationTest.java       | 32 ++++++++
 .../SuperTestServiceIntegrationTest.java      | 32 ++++++++
 .../service/TestServiceIntegrationTest.java   | 32 ++++++++
 10 files changed, 264 insertions(+)
 create mode 100644 spring-types-bean-injection/README.md
 create mode 100644 spring-types-bean-injection/pom.xml
 create mode 100644 spring-types-bean-injection/src/main/java/com/baeldung/config/AppConfig.java
 create mode 100644 spring-types-bean-injection/src/main/java/com/baeldung/service/MegaTestService.java
 create mode 100644 spring-types-bean-injection/src/main/java/com/baeldung/service/SuperTestService.java
 create mode 100644 spring-types-bean-injection/src/main/java/com/baeldung/service/TestService.java
 create mode 100644 spring-types-bean-injection/src/test/java/com/baeldung/service/MegaTestServiceIntegrationTest.java
 create mode 100644 spring-types-bean-injection/src/test/java/com/baeldung/service/SuperTestServiceIntegrationTest.java
 create mode 100644 spring-types-bean-injection/src/test/java/com/baeldung/service/TestServiceIntegrationTest.java

diff --git a/pom.xml b/pom.xml
index b76c9b8ddd..eef32f884e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -170,6 +170,7 @@
         <module>spring-social-login</module>
         <module>spring-spel</module>
         <module>spring-thymeleaf</module>
+        <module>spring-types-bean-injection</module>
         <module>spring-userservice</module>
         <module>spring-zuul</module>
         <module>spring-reactor</module>
diff --git a/spring-types-bean-injection/README.md b/spring-types-bean-injection/README.md
new file mode 100644
index 0000000000..45f8216849
--- /dev/null
+++ b/spring-types-bean-injection/README.md
@@ -0,0 +1,3 @@
+## Relevant articles:
+
+- [Constructor Dependency Injection in Spring](http://www.baeldung.com/constructor-injection-in-spring)
\ No newline at end of file
diff --git a/spring-types-bean-injection/pom.xml b/spring-types-bean-injection/pom.xml
new file mode 100644
index 0000000000..75fee65d80
--- /dev/null
+++ b/spring-types-bean-injection/pom.xml
@@ -0,0 +1,81 @@
+<?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-types-bean-injection</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<packaging>jar</packaging>
+
+	<name>spring-types-bean-injection</name>
+	<description>Types of bean injection in spring</description>
+
+	<parent>
+		<groupId>com.baeldung</groupId>
+		<artifactId>parent-modules</artifactId>
+		<version>1.0.0-SNAPSHOT</version>
+	</parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context</artifactId>
+            <version>${spring.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <version>${spring.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <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>
+                                    <excludes>
+                                        <exclude>**/*LiveTest.java</exclude>
+                                    </excludes>
+                                    <includes>
+                                        <include>**/*IntegrationTest.java</include>
+                                    </includes>
+                                </configuration>
+                            </execution>
+                        </executions>
+                        <configuration>
+                            <systemPropertyVariables>
+                                <test.mime>json</test.mime>
+                            </systemPropertyVariables>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
+
+    <properties>
+        <java.version>1.8</java.version>
+        <spring.version>4.3.10.RELEASE</spring.version>
+        <junit.version>4.12</junit.version>
+    </properties>
+
+</project>
diff --git a/spring-types-bean-injection/src/main/java/com/baeldung/config/AppConfig.java b/spring-types-bean-injection/src/main/java/com/baeldung/config/AppConfig.java
new file mode 100644
index 0000000000..45be32fa06
--- /dev/null
+++ b/spring-types-bean-injection/src/main/java/com/baeldung/config/AppConfig.java
@@ -0,0 +1,25 @@
+package com.baeldung.config;
+
+import com.baeldung.service.MegaTestService;
+import com.baeldung.service.SuperTestService;
+import com.baeldung.service.TestService;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class AppConfig {
+    @Bean
+    public TestService TestService() {
+        return new TestService();
+    }
+
+    @Bean
+    public SuperTestService SuperTestService() {
+        return new SuperTestService(new TestService());
+    }
+
+    @Bean
+    public MegaTestService MegaTestService() {
+        return new MegaTestService();
+    }
+}
diff --git a/spring-types-bean-injection/src/main/java/com/baeldung/service/MegaTestService.java b/spring-types-bean-injection/src/main/java/com/baeldung/service/MegaTestService.java
new file mode 100644
index 0000000000..45deeb8592
--- /dev/null
+++ b/spring-types-bean-injection/src/main/java/com/baeldung/service/MegaTestService.java
@@ -0,0 +1,22 @@
+package com.baeldung.service;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class MegaTestService {
+    private TestService testService;
+
+    @Autowired
+    public void setTestService(TestService testService) {
+        this.testService = testService;
+    }
+
+    public String getMegaTestOne() {
+        return "Mega" + testService.getTestOne();
+    }
+
+    public String getMegaTestTwo() {
+        return "Mega" + testService.getTestTwo();
+    }
+}
diff --git a/spring-types-bean-injection/src/main/java/com/baeldung/service/SuperTestService.java b/spring-types-bean-injection/src/main/java/com/baeldung/service/SuperTestService.java
new file mode 100644
index 0000000000..edf1f2b1c5
--- /dev/null
+++ b/spring-types-bean-injection/src/main/java/com/baeldung/service/SuperTestService.java
@@ -0,0 +1,22 @@
+package com.baeldung.service;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class SuperTestService {
+    private TestService testService;
+
+    @Autowired
+    public SuperTestService(TestService testService) {
+        this.testService = testService;
+    }
+
+    public String getSuperTestOne() {
+        return "Super" + testService.getTestOne();
+    }
+
+    public String getSuperTestTwo() {
+        return "Super" + testService.getTestTwo();
+    }
+}
diff --git a/spring-types-bean-injection/src/main/java/com/baeldung/service/TestService.java b/spring-types-bean-injection/src/main/java/com/baeldung/service/TestService.java
new file mode 100644
index 0000000000..3e7c327dbd
--- /dev/null
+++ b/spring-types-bean-injection/src/main/java/com/baeldung/service/TestService.java
@@ -0,0 +1,14 @@
+package com.baeldung.service;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class TestService {
+    public String getTestOne() {
+        return "TestOne";
+    }
+
+    public String getTestTwo() {
+        return "TestTwo";
+    }
+}
diff --git a/spring-types-bean-injection/src/test/java/com/baeldung/service/MegaTestServiceIntegrationTest.java b/spring-types-bean-injection/src/test/java/com/baeldung/service/MegaTestServiceIntegrationTest.java
new file mode 100644
index 0000000000..ced897c70c
--- /dev/null
+++ b/spring-types-bean-injection/src/test/java/com/baeldung/service/MegaTestServiceIntegrationTest.java
@@ -0,0 +1,32 @@
+package com.baeldung.service;
+
+import com.baeldung.config.AppConfig;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.hamcrest.CoreMatchers.is;
+
+@RunWith(SpringRunner.class)
+@ContextConfiguration(classes = {AppConfig.class})
+public class MegaTestServiceIntegrationTest {
+    @Autowired
+    MegaTestService megaTestService;
+
+    @Test
+    public void whenCallingGetMegaTestOne_thenWeGetMegaTestOneString() {
+        String resultOne = megaTestService.getMegaTestOne();
+
+        Assert.assertThat(resultOne, is("MegaTestOne"));
+    }
+
+    @Test
+    public void whenCallingGetMegaTestTwo_thenWeGetMegaTestTwoString() {
+        String resultTwo = megaTestService.getMegaTestTwo();
+
+        Assert.assertThat(resultTwo, is("MegaTestTwo"));
+    }
+}
diff --git a/spring-types-bean-injection/src/test/java/com/baeldung/service/SuperTestServiceIntegrationTest.java b/spring-types-bean-injection/src/test/java/com/baeldung/service/SuperTestServiceIntegrationTest.java
new file mode 100644
index 0000000000..a037d70c40
--- /dev/null
+++ b/spring-types-bean-injection/src/test/java/com/baeldung/service/SuperTestServiceIntegrationTest.java
@@ -0,0 +1,32 @@
+package com.baeldung.service;
+
+import com.baeldung.config.AppConfig;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.hamcrest.CoreMatchers.is;
+
+@RunWith(SpringRunner.class)
+@ContextConfiguration(classes = {AppConfig.class})
+public class SuperTestServiceIntegrationTest {
+    @Autowired
+    SuperTestService superTestService;
+
+    @Test
+    public void whenCallingGetSuperTestOne_thenWeGetSuperTestOneString() {
+        String resultOne = superTestService.getSuperTestOne();
+
+        Assert.assertThat(resultOne, is("SuperTestOne"));
+    }
+
+    @Test
+    public void whenCallingGetSuperTestTwo_thenWeGetSuperTestTwoString() {
+        String resultTwo = superTestService.getSuperTestTwo();
+
+        Assert.assertThat(resultTwo, is("SuperTestTwo"));
+    }
+}
diff --git a/spring-types-bean-injection/src/test/java/com/baeldung/service/TestServiceIntegrationTest.java b/spring-types-bean-injection/src/test/java/com/baeldung/service/TestServiceIntegrationTest.java
new file mode 100644
index 0000000000..2059e87e04
--- /dev/null
+++ b/spring-types-bean-injection/src/test/java/com/baeldung/service/TestServiceIntegrationTest.java
@@ -0,0 +1,32 @@
+package com.baeldung.service;
+
+import com.baeldung.config.AppConfig;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.hamcrest.CoreMatchers.is;
+
+@RunWith(SpringRunner.class)
+@ContextConfiguration(classes = { AppConfig.class })
+public class TestServiceIntegrationTest {
+    @Autowired
+    TestService testService;
+
+    @Test
+    public void whenCallingGetTestOne_thenWeGetTestOneString() {
+        String resultOne = testService.getTestOne();
+
+        Assert.assertThat(resultOne, is("TestOne"));
+    }
+
+    @Test
+    public void whenCallingGetTestTwo_thenWeGetTestTwoString() {
+        String resultTwo = testService.getTestTwo();
+
+        Assert.assertThat(resultTwo, is("TestTwo"));
+    }
+}
\ No newline at end of file