有效解决办法：marven:Fatal error compiling: 无效的目标发行版: 11

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[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:testCompile (default-testCompile) on project teavm-tests: Fatal error compiling: 无效的目标发行版: 11 -> [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/MojoExecutionException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <args> -rf :teavm-tests

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       <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>${maven-compiler-plugin.version}</version>
          <configuration>
            <source>${java-tests.version}</source>
            <target>${java-tests.version}</target>
          </configuration>
        </plugin>

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    <java.version>1.8</java.version>
    <java-tests.version>11</java-tests.version>