如何找出并更改Java Maven用于执行的版本？

When running our Maven build, a member of my team gets this error when executing. However, when we run java -version from her command line, it indicates Java 1.6.0_26. The error obviously seems to be screaming that Maven is using Java 5.

运行我们的Maven构建时，我的团队成员在执行时会收到此错误。但是，当我们从她的命令行运行java -version时，它表示Java 1.6.0_26。 Maven正在使用Java 5，这个错误显然似乎在尖叫。

How do I figure out and change what version of Java is being used by Maven?

我如何找出并更改Maven正在使用的Java版本？

3 potentially important notes:

3个可能重要的说明：

This is executed at the command line, not using Eclipse plugin
这是在命令行执行的，而不是使用Eclipse插件
JAVA_HOME is set to a Java 1.6 JDK
JAVA_HOME设置为Java 1.6 JDK
Using Maven 2.2.1
使用Maven 2.2.1

4 个解决方案

#1

mvn -version will output which java it's using. If JAVA_HOME is set to a valid JDK directory and Maven is using something else, then most likely someone has tampered with the way that Maven starts up.

mvn -version将输出它正在使用的java。如果将JAVA_HOME设置为有效的JDK目录并且Maven正在使用其他内容，则很可能有人篡改了Maven启动的方式。

#2

You will need to configure maven-compiler-plugin to use 1.6 source and target parameters ( by default it is 1.5 ).

您需要配置maven-compiler-plugin以使用1.6源和目标参数（默认情况下为1.5）。

This is the best done in your project's parent pom in <pluginManagment> section ( but you can always configure it per individual projects of course ).

这是在部分中项目的父pom中最好的（但是你总是可以根据每个项目配置它）。

  <build>

    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>2.3.2</version>
          <configuration>
            <source>1.6</source>
            <target>1.6</target>

          </configuration>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>

#3

Look here: http://www.MacAdie.net/2011/07/10/adding-some-xml-to-netbeans-pom-files/

请看这里：http：//www.MacAdie.net/2011/07/10/adding-some-xml-to-netbeans-pom-files/

#4

mvn -version tells you what compiler Maven is using, so this answers the question unless your POM specifies override values for the versions to be used.

mvn -version告诉你Maven正在使用什么编译器，所以除非你的POM为要使用的版本指定覆盖值，否则它会回答这个问题。

Here's the easiest way to specify the overrides in pom.xml:

这是在pom.xml中指定覆盖的最简单方法：

<properties>
    <maven.compiler.target>1.9</maven.compiler.target>
    <maven.compiler.source>1.9</maven.compiler.source>
</properties>

Alternatively, the maven-compiler-plugin can be specified more explicitly. In that case, look at the <source> and <target> values associated with the plugin.

或者，可以更明确地指定maven-compiler-plugin。在这种情况下，请查看与插件关联的和值。

Both of these options are described here.

这两个选项都在这里描述。

If your POM has a <parent>, then you need to check that as well (recursively).

如果你的POM有，那么你也需要检查它（递归）。

Note: When source and target are specified, these values are passed as command-line options to the compiler. Using this feature, you can compile or run against earlier Java versions than the compiler's nominal value.

注意：指定source和target时，这些值将作为命令行选项传递给编译器。使用此功能，您可以编译或运行早于Java版本而不是编译器的标称值。

#1