IntelliJ - Convert a Java project/module into a Maven project/module

Solution 1:

Right-click on the module, select "Add framework support...", and check the "Maven" technology.

(This also creates a pom.xml for you to modify.)

If you mean adding source repository elements, I think you need to do that manually–not sure.

Pre-IntelliJ 13 this won't convert the project to the Maven Standard Directory Layout, 13+ it will.

Solution 2:

A visual for those that benefit from it.

After right-clicking the project name ("test" in this example), select "Add framework support" and check the "Maven" option.

Solution 3:

1. Open 'Maven projects' (tab on the right side).
2. Use 'Add Maven Projects'
3. Find your pom.xml

Solution 4:

Just follow the steps:

1. Right click to on any module pox.xml and then chose "Add as Maven Project"

2. Next to varify it, go to the maven tab, you will see the project with all maven goal which you can use:

Solution 5:

I want to add the important hint that converting a project like this can have side effects which are noticeable when you have a larger project. This is due the fact that Intellij Idea (2017) takes some important settings only from the pom.xml then which can lead to some confusion, following sections are affected at least:

1. Annotation settings are changed for the modules
2. Compiler output path is changed for the modules
3. Resources settings are ignored totally and only taken from pom.xml
4. Module dependencies are messed up and have to checked
5. Language/Encoding settings are changed for the modules

All these points need review and adjusting but after this it works like charm.

Further more unfortunately there is no sufficient pom.xml template created, I have added an example which might help to solve most problems.

<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>Name</groupId>
<artifactId>Artifact</artifactId>
<version>4.0</version>
<properties>
    <!-- Generic properties -->
    <java.version>1.8</java.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
</properties>
<dependencies>
    <!--All dependencies to put here, including module dependencies-->
</dependencies>
<build>
    <directory>${project.basedir}/target</directory>
    <outputDirectory>${project.build.directory}/classes</outputDirectory>
    <testOutputDirectory>${project.build.directory}/test-classes</testOutputDirectory>
    <sourceDirectory>${project.basedir}/src/main/java</sourceDirectory>
    <testSourceDirectory> ${project.basedir}/src/test/java</testSourceDirectory>

    <resources>
        <resource>
            <directory>${project.basedir}/src/main/java</directory>
            <excludes>
                <exclude>**/*.java</exclude>
            </excludes>
        </resource>
        <resource>
            <directory>${project.basedir}/src/main/resources</directory>
            <includes>
                <include>**/*</include>
            </includes>
        </resource>
    </resources>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.5.1</version>
            <configuration>
                <annotationProcessors/>
                <source>${java.version}</source>
                <target>${java.version}</target>
            </configuration>
        </plugin>
    </plugins>
</build>

Edit 2019:

• Added recursive resource scan
• Added directory specification which might be important to avoid confusion of IDEA recarding the content root structure