How to convert an existing Java Project to Maven in Eclipse?

This tutorial talks about Converting an existing Java Project to Maven in Eclipse?

I have a Non-Maven Spring Project which I want to convert into a maven project.

Before converting an existing Java Project to Maven in Eclipse:

Steps to convert an existing Java Project to Maven in Eclipse:

Step 1: Right-click on your java project and go to Configure and you should see the “Convert to Maven Project” option.

Step 2: Provide group id and artifact id, I have kept the default.

Let me explain to you more about group id and artifact id.

Group id : It is a unique identifier for your project among all. So it may be something like com.companyname

Artifact id : It is the name of jar or war without a version. it may be something like a project, so here we have put artifact id as SpringApplicationContextDemo.

Click on the finish button.

Step 3:
Just remember to put all dependencies in pom.xml

<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>SpringApplicationContextDemo</groupId>
	<artifactId>SpringApplicationContextDemo</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<properties>
		<spring.version>4.2.6.RELEASE</spring.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-beans</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context-support</artifactId>
			<version>${spring.version}</version>
		</dependency>
	</dependencies>

	<build>
		<sourceDirectory>src</sourceDirectory>
		<resources>
			<resource>
				<directory>src</directory>
				<excludes>
					<exclude>**/*.java</exclude>
				</excludes>
			</resource>
		</resources>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.7.0</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

<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">

<groupId>SpringApplicationContextDemo</groupId>

<artifactId>SpringApplicationContextDemo</artifactId>

<version>0.0.1-SNAPSHOT</version>

<spring.version>4.2.6.RELEASE</spring.version>

</properties>

<groupId>org.springframework</groupId>

<artifactId>spring-beans</artifactId>

<version>${spring.version}</version>

</dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-context</artifactId>

<version>${spring.version}</version>

</dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-context-support</artifactId>

<version>${spring.version}</version>

</dependency>

</dependencies>

<build>

</excludes>

</resource>

</resources>

<artifactId>maven-compiler-plugin</artifactId>

</configuration>

</plugin>

</plugins>

</build>

</project>

Step 4: Now right on converted maven project then go to maven ->Update Project

Step 5. Select Your Project & Force Update of Snapshots/Releases. Click on OK

Finally, the Maven Project would look like this:

Note: Still this conversion process has a problem like you will not find standards project directory structures src/main/java and src/test/java, You can solve this issue manually(Still you can build and run the project successfully).

Complete source code of the above Project:

pom.xml

<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>SpringApplicationContextDemo</groupId>
	<artifactId>SpringApplicationContextDemo</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<properties>
		<spring.version>4.2.6.RELEASE</spring.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-beans</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context-support</artifactId>
			<version>${spring.version}</version>
		</dependency>
	</dependencies>

	<build>
		<sourceDirectory>src</sourceDirectory>
		<resources>
			<resource>
				<directory>src</directory>
				<excludes>
					<exclude>**/*.java</exclude>
				</excludes>
			</resource>
		</resources>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.7.0</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

<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">

<groupId>SpringApplicationContextDemo</groupId>

<artifactId>SpringApplicationContextDemo</artifactId>

<version>0.0.1-SNAPSHOT</version>

<spring.version>4.2.6.RELEASE</spring.version>

</properties>

<groupId>org.springframework</groupId>

<artifactId>spring-beans</artifactId>

<version>${spring.version}</version>

</dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-context</artifactId>

<version>${spring.version}</version>

</dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-context-support</artifactId>

<version>${spring.version}</version>

</dependency>

</dependencies>

<build>

</excludes>

</resource>

</resources>

<artifactId>maven-compiler-plugin</artifactId>

</configuration>

</plugin>

</plugins>

</build>

</project>

Employee.java

package com.infotech.model;

import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;

public class Employee implements InitializingBean,DisposableBean{

	private Integer employeeId;
	private String employeeName;
	
	public Integer getEmployeeId() {
		return employeeId;
	}
	public void setEmployeeId(Integer employeeId) {
		this.employeeId = employeeId;
	}
	public String getEmployeeName() {
		return employeeName;
	}
	public void setEmployeeName(String employeeName) {
		this.employeeName = employeeName;
	}
	@Override
	public void afterPropertiesSet() throws Exception {
		System.out.println("Bean is going through init process...");
	}
	@Override
	public void destroy() throws Exception {
		System.out.println("Bean is going to destroy...");
	}
}

package com.infotech.model;

import org.springframework.beans.factory.DisposableBean;

import org.springframework.beans.factory.InitializingBean;

public class Employee implements InitializingBean,DisposableBean{

private Integer employeeId;

private String employeeName;

public Integer getEmployeeId() {

return employeeId;

}

public void setEmployeeId(Integer employeeId) {

this.employeeId = employeeId;

}

public String getEmployeeName() {

return employeeName;

}

public void setEmployeeName(String employeeName) {

this.employeeName = employeeName;

}

@Override

public void afterPropertiesSet() throws Exception {

System.out.println("Bean is going through init process...");

}

@Override

public void destroy() throws Exception {

System.out.println("Bean is going to destroy...");

}

ClientTest.java

package com.infotech.client;

import org.springframework.beans.BeansException;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.infotech.model.Employee;

public class ClientTest {

	public static void main(String[] args) {
		AbstractApplicationContext context = null;
		try {
			context = new ClassPathXmlApplicationContext("applicationContext.xml");
			Employee employee =   context.getBean("employee", Employee.class);
			
			System.out.println(employee.getEmployeeId()+"\t"+employee.getEmployeeName());
			context.registerShutdownHook();
			
		} catch (BeansException e) {
			if(context != null)
				context.close();
		}
	}
}

package com.infotech.client;

import org.springframework.beans.BeansException;

import org.springframework.context.support.AbstractApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.infotech.model.Employee;

public class ClientTest {

public static void main(String[] args) {

AbstractApplicationContext context = null;

try {

context = new ClassPathXmlApplicationContext("applicationContext.xml");

Employee employee = context.getBean("employee", Employee.class);

System.out.println(employee.getEmployeeId()+"\t"+employee.getEmployeeName());

context.registerShutdownHook();

} catch (BeansException e) {

if(context != null)

context.close();

}

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context.xsd">

	<bean id="employee" class="com.infotech.model.Employee">
		<property name="employeeId" value="19901"></property>
		<property name="employeeName" value="Sean Murphy"></property>
	</bean>
	
</beans>

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:context="http://www.springframework.org/schema/context"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context.xsd">

</bean>

</beans>

If You right-click on ClientTest.java and Run AS -> Java Application. I will give below output

That’s all about Convert an existing Java Project to Maven in Eclipse?

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