Maven中构建->sourceDirectory的隐式分配

Question

如果pom有一个<build>标记，但其中没有显式设置<sourceDirectory>，那么Maven是否查看根目录中是否有源代码的src目录？我之所以问这个问题，是因为我在项目中继承的一些poms确实有源代码do，还有一些没有<sourceDirectory>。只有在实际源目录不是src (例如src/java)的情况下，才有必要显式设置该值吗？

下面是一个这样的pom构建定义的示例(注意，这是pom层次结构中的子pom )：

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-resources-plugin</artifactId>
            <configuration>
                <encoding>UTF-8</encoding>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <encoding>UTF-8</encoding>
                <source>1.6</source>
                <target>1.6</target>
            </configuration>
        </plugin>
        <plugin>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
                <archive>
                    <manifest>
                        <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
                        <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
                    </manifest>
                    <manifestEntries>
                        <Internal-Build-num>1.0-mybuild-SNAPSHOT</Internal-Build-num>
                    </manifestEntries>
                </archive>
            </configuration>
        </plugin>
    </plugins>
</build>

下面是build在superpom中的部分

<build>
    <pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>versions-maven-plugin</artifactId>
                <version>2.1</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-scm-plugin</artifactId>
                <version>1.8.1</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>2.5</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.7.2</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>2.3.1</version>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>build-helper-maven-plugin</artifactId>
                <version>1.8</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>2.1</version>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>native-maven-plugin</artifactId>
                <version>1.0-alpha-7</version>
            </plugin>
            <plugin>
                <groupId>org.codehaus.gmaven</groupId>
                <artifactId>gmaven-plugin</artifactId>
                <version>1.5</version>
            </plugin>
        </plugins>
    </pluginManagement>

    <plugins>
        <!-- Version numbering -->
        <plugin>
            <artifactId>maven-scm-plugin</artifactId>
            <configuration>
                <!-- TAG format -->
                <tag>${project.artifactId}-${project.version}</tag>
                <pushChanges>false</pushChanges>
            </configuration>
        </plugin>

        <!-- Version numbering -->
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>versions-maven-plugin</artifactId>
            <configuration>
                <updateDependencies>true</updateDependencies>
                <generateBackupPoms>false</generateBackupPoms>
            </configuration>
        </plugin>
    </plugins>

</build>

Answer 1

Maven是关于约定高于配置的，所以是的，您只需要在默认情况下指定sourceDirectory。java源代码的默认位置是：src/main/java

了解有关默认项目配置的信息：标准目录布局简介