Unsupported major.minor version 51.0 on Junit, but not web app

问题

I'm running Junits on our app server that fail with Unsupported major.minor version 51.0. But, the web application then builds, deploys, and runs fine. I don't understand how this can happen. My maven compiler's config looks like this:

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-compiler-plugin</artifactId> 
  <version>2.3.2</version>
  <configuration>
    <verbose>true</verbose>
    <fork>true</fork>
    <source>1.7</source>
    <target>1.7</target>
    <executable>${JAVA_1_7_HOME}/bin/javac</executable>
    <encoding>ISO-8859-1</encoding>
    <verbose>true</verbose> 
  </configuration>
</plugin>

And my Junit dependency:

<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <scope>test</scope>
  <version>4.10</version>
</dependency> 

Can anyone think of a reason this is failing?

回答1:

The maven-surefire-plugin is responsible for running JUnit tests. Try adding this config.

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-surefire-plugin</artifactId> 
  <version>2.16</version>
  <configuration>
    <jvm>${JAVA_1_7_HOME}/bin/javac</jvm>
  </configuration>
</plugin>

来源：https://stackoverflow.com/questions/19391314/unsupported-major-minor-version-51-0-on-junit-but-not-web-app