Maven compile with multiple src directories

user_13753 0
Viewed 186323

Is there a way to compile multiple java source directories in a single maven project?

maven-2 java
10 Answers

You can add a new source directory with build-helper:

<build>
    <plugins>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>build-helper-maven-plugin</artifactId>
            <version>3.2.0</version>
            <executions>
                <execution>
                    <phase>generate-sources</phase>
                    <goals>
                        <goal>add-source</goal>
                    </goals>
                    <configuration>
                        <sources>
                            <source>src/main/generated</source>
                        </sources>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>
Admin1

This worked for me

<build>
    <sourceDirectory>.</sourceDirectory>
    <plugins>
        <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
        <includes>
            <include>src/main/java/**/*.java</include>
            <include>src/main2/java/**/*.java</include>
        </includes>
        </configuration>
        </plugin>
    </plugins>
</build>
user_137530

This worked for with maven 3.5.4 and now Intellij Idea see this code as source:

<plugin>
     <groupId>org.apache.maven.plugins</groupId>
     <artifactId>maven-compiler-plugin</artifactId>
     <version>3.3</version>
     <configuration>
         <generatedSourcesDirectory>src/main/generated</generatedSourcesDirectory>                    
     </configuration>
</plugin>
user_71795090

While the answer from evokk is basically correct, it is missing test classes. You must add test classes with goal add-test-source:

<execution>
    <phase>generate-sources</phase>
    <goals>
        <goal>add-test-source</goal>
    </goals>
    <configuration>
       <sources>
            <source>target/generated/some-test-classes</source>
        </sources>
    </configuration>
</execution>
user_6323310

In the configuration, you can use <compileSourceRoots>.

oal:          org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-cli)
[DEBUG] Style:         Regular
[DEBUG] Configuration: <?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <basedir default-value="${basedir}"/>
  <buildDirectory default-value="${project.build.directory}"/>
  <compilePath default-value="${project.compileClasspathElements}"/>
  <compileSourceRoots default-value="${project.compileSourceRoots}"/>
  <compilerId default-value="javac">${maven.compiler.compilerId}</compilerId>
  <compilerReuseStrategy default-value="${reuseCreated}">${maven.compiler.compilerReuseStrategy}</compilerReuseStrategy>
  <compilerVersion>${maven.compiler.compilerVersion}</compilerVersion>
  <debug default-value="true">${maven.compiler.debug}</debug>
  <debuglevel>${maven.compiler.debuglevel}</debuglevel>
  <encoding default-value="${project.build.sourceEncoding}">${encoding}</encoding>
  <executable>${maven.compiler.executable}</executable>
  <failOnError default-value="true">${maven.compiler.failOnError}</failOnError>
  <failOnWarning default-value="false">${maven.compiler.failOnWarning}</failOnWarning>
  <forceJavacCompilerUse default-value="false">${maven.compiler.forceJavacCompilerUse}</forceJavacCompilerUse>
  <fork default-value="false">${maven.compiler.fork}</fork>
  <generatedSourcesDirectory default-value="${project.build.directory}/generated-sources/annotations"/>
  <maxmem>${maven.compiler.maxmem}</maxmem>
  <meminitial>${maven.compiler.meminitial}</meminitial>
  <mojoExecution default-value="${mojoExecution}"/>
  <optimize default-value="false">${maven.compiler.optimize}</optimize>
  <outputDirectory default-value="${project.build.outputDirectory}"/>
  <parameters default-value="false">${maven.compiler.parameters}</parameters>
  <project default-value="${project}"/>
  <projectArtifact default-value="${project.artifact}"/>
  <release>${maven.compiler.release}</release>
  <session default-value="${session}"/>
  <showDeprecation default-value="false">${maven.compiler.showDeprecation}</showDeprecation>
  <showWarnings default-value="false">${maven.compiler.showWarnings}</showWarnings>
  <skipMain>${maven.main.skip}</skipMain>
  <skipMultiThreadWarning default-value="false">${maven.compiler.skipMultiThreadWarning}</skipMultiThreadWarning>
  <source default-value="1.6">${maven.compiler.source}</source>
  <staleMillis default-value="0">${lastModGranularityMs}</staleMillis>
  <target default-value="1.6">${maven.compiler.target}</target>
  <useIncrementalCompilation default-value="true">${maven.compiler.useIncrementalCompilation}</useIncrementalCompilation>
  <verbose default-value="false">${maven.compiler.verbose}</verbose>
</configuration>

these are all the configurations available for 3.8.1 version of compiler plugin. Different versions have different configurations which you can find by running your code with -X after the general mvn command. Like

mvn clean install -X
mvn compiler:compile -X

and search with id or goal or plugin name This may help with other plugins too. Eclipse, intelliJ may not show all configurations as suggestions.

user_117508390
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