为什么maven要把我的代码编译成源代码1.3？

x4shl7ld 于 2021-06-03 发布在 Hadoop

关注(0)|答案(2)|浏览(422)

我得到这个错误 mvn -e package 在ubuntu 12.04中：

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile) on project HadoopSkeleton: Compilation failure: Compilation failure:
[ERROR] /home/jesvin/dev/hadoop/HadoopMahoutSkeleton-master/src/main/java/HadoopSkeleton/App.java:[22,8] error: generics are not supported in -source 1.3
[ERROR] 
[ERROR] (use -source 5 or higher to enable generics)
[ERROR] /home/jesvin/dev/hadoop/HadoopMahoutSkeleton-master/src/main/java/HadoopSkeleton/App.java:[53,28] error: for-each loops are not supported in -source 1.3
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile) on project HadoopSkeleton: Compilation failure
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.CompilationFailureException: Compilation failure
    at org.apache.maven.plugin.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:516)
    at org.apache.maven.plugin.CompilerMojo.execute(CompilerMojo.java:114)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    ... 19 more
[ERROR] 
[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

所以我猜maven是被迫针对旧版本的java进行编译的。但为什么会这样呢？我只需要一个maven配置来构建mahout jar。

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-core</artifactId>
        <version>1.0.4</version>
        <!-- or whatever version -->
    </dependency>
    <dependency>
        <groupId>org.apache.mahout</groupId>
        <artifactId>mahout-core</artifactId>
        <version>0.7</version>
    </dependency>
</dependencies>

我正在努力建立https://github.com/yeahiii/hadoopmahoutskeleton/blob/master/pom.xml

java version "1.7.0_21"
Java(TM) SE Runtime Environment (build 1.7.0_21-b11)
Java HotSpot(TM) Server VM (build 23.21-b01, mixed mode)

hadoop Maven mahout

来源：https://stackoverflow.com/questions/16662830/why-is-maven-trying-to-compile-my-code-as-source-1-3

2条答案

按热度按时间

68bkxrlz1#

使用maven编译器插件

<plugins>
     <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.1</version>
          <configuration>
              <source>1.7</source>
              <target>1.7</target>
          </configuration>
      </plugin>
</plugins>

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u0njafvf2#

这个类似问题的答案可能会回答你最初的问题，为什么。
引用那篇文章：
配置maven编译器插件可以解决这个问题。原来这个问题是由ubuntu存储库中的maven3包引起的。另一种修复方法是从apache网站下载maven 3，该网站使用更为最新的编译器插件。
我想知道当文档声明默认java源代码是1.5时为什么会发生这种情况。要查看mvn在编译器插件中使用了什么，请使用：
mvn公司help:effective-pom
我的maven编译器插件是2.0.2，尽管我使用的是ubuntu包中的maven 3.0.4。当我使用apache中的maven 3.0.4运行相同的命令时，我有一个插件版本2.3.2，它默认为Java1.5。

赞(0）回复(0）举报 2021-06-03

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为什么maven要把我的代码编译成源代码1.3？

2条答案

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