Java用源代码1.7 (或7)构建失败

Question

我正在将我的java 6代码升级到java 7，更新后的JAVA_HOME指向OSX10.9上的JDK1.7。代码还没有使用任何Java 7特性。

当我运行构建"mvn干净安装“时，生成中断，没有任何有用的错误消息。

构建通过source=1.6和target=1.6继承了，但是对于source=1.7 (或7)和target=1.7 (或7)，失败了

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version> <!-- tried with 2.3.2 and 3.0... no luck -->
        <configuration>
          <source>7</source>
          <target>7</target>
          <compilerArgument>-Werror </compilerArgument>
          <fork>true</fork>
        </configuration>

Error Message:
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 8.773 s
[INFO] Finished at: 2014-06-25T14:56:13-08:00
[INFO] Final Memory: 10M/245M
[INFO] ------------------------------------------------------------------------
[**ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:testCompile (default-testCompile) on project core: Compilation failure
[ERROR] Failure executing javac,  but could not parse the error:
[ERROR] 1 error
[ERROR] -> [Help 1]**
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

Answer 1

我猜用JDK1.7编译您的代码会产生警告，而用1.6编译则不会。由于您告诉编译器在遇到<compilerArgument>-Werror </compilerArgument>警告时直接退出，这正是它所要做的，这并不是非常友好的Maven。我猜Maven会吞下原来的警告，以显示javac进程意外退出的错误。

删除<compilerArgument>-Werror </compilerArgument>指令应该允许继续编译。您必须更好地处理编译器警告，而不是让编译器退出，比如查看/解析Maven输出。