这对我很有效

<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>

你可以用build-helper添加一个新的源目录:

<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>

Used the build-helper-maven-plugin from the post - and update src/main/generated. And mvn clean compile works on my ../common/src/main/java, or on ../common, so kept the latter. Then yes, confirming that IntelliJ IDEA (ver 10.5.2) level of the compilation failed as David Phillips mentioned. The issue was that IDEA did not add another source root to the project. Adding it manually solved the issue. It's not nice as editing anything in the project should come from maven and not from direct editing of IDEA's project options. Yet I will be able to live with it until they support build-helper-maven-plugin directly such that it will auto add the sources.

然后需要另一种变通方法来实现这一工作。由于每次IDEA在pom更改后重新导入maven设置，我新添加的源代码都保留在模块上，但它失去了源文件夹的选择，并且毫无用处。所以对于IDEA -需要设置这些一次:

选择-项目设置/ Maven /导入/保留源代码和测试 重新导入文件夹。 添加-项目结构/项目设置/模块/{模块}/来源/添加内容根。

现在把这些文件夹保存在导入状态也不是世界上最好的做法……，但试一试。

在配置中，您可以使用<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>

这些都是3.8.1版本的编译插件可用的所有配置。不同的版本有不同的配置，您可以通过在通用mvn命令后使用-X运行代码来找到这些配置。就像

mvn clean install -X
mvn compiler:compile -X

并搜索id或目标或插件名称 这可能对其他插件也有帮助。Eclipse、intelliJ可能不会显示所有配置作为建议。

这可以分两步完成:

对于每个源目录，您应该创建自己的模块。 在所有模块中，您应该指定相同的构建目录:${build.directory}

如果你使用已启动的Jetty (Jetty:run)，那么重新编译任何模块中的任何类(使用Maven、IDEA或Eclipse)都会导致Jetty重新启动。对于修改后的资源，您将获得相同的行为。

通过定义资源标记，这也适用于maven。您可以为src文件夹命名任何您喜欢的名称。

    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.java</include>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
        </resource>

        <resource>
            <directory>src/main/resources</directory>
            <includes>
                <include>**/*.java</include>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
        </resource>

        <resource>
            <directory>src/main/generated</directory>
            <includes>
                <include>**/*.java</include>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
        </resource>
    </resources>