如何在 maven settings.xml 中配置编译器级别（1.6）？

Question

I am familiar with configuring maven-compiler-plugin to use java 1.6 in pom.xml and using parent pom file.

Is there a way to configure java compiler level to java 1.6 in the settings.xml level (so that all my maven projects will use java 1.6)?

In this thread default maven compiler setting somebody told there is a way to configure it in settings.xml. Can someone please explain how to configure?

PS: Another way to specify Java compiler level:

<properties>
       <maven.compiler.source>1.6</maven.compiler.source>
       <maven.compiler.target>1.6</maven.compiler.target>
</properties>

-Siva

Answer 1

Simple answer No. In the settings file you don't configure things like this, cause it doesn't make sense and would make your builds not reproducible. The information about configuring the compiler plugin in settings.xml is rubbish.

Answer 2

source/target level can be configured in settings.xml, like this:

<profiles>
    <profile>
      <id>jdk-1.6</id>
      <activation>
          // can be replaced with other conditions
          <jdk>1.6</jdk>
      </activation>
      <properties>
          <maven.compiler.source>1.6</maven.compiler.source>
          <maven.compiler.target>1.6</maven.compiler.target>
          <maven.compiler.compilerVersion>1.6</maven.compiler.compilerVersion>
      </properties>
    </profile>
</profiles>