maven构建本地环境的hadoop错误

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.8.1:jar (module-javadocs) on project hadoop-maven-plugins: MavenReportException: Error while creating archive:
[ERROR] Exit code: 1 - /home/ubuntu1/release-2.3.0/hadoop-maven-plugins/src/main/java/org/apache/hadoop/maven/plugin/util/Exec.java:47: error: unknown tag: String
[ERROR] * @param command List containing command and all arguments
[ERROR] ^
[ERROR] /home/ubuntu1/release-2.3.0/hadoop-maven-plugins/src/main/java/org/apache/hadoop/maven/plugin/util/Exec.java:48: error: unknown tag: String
[ERROR] * @param output List in/out parameter to receive command output
[ERROR] ^
[ERROR] /home/ubuntu1/release-2.3.0/hadoop-maven-plugins/src/main/java/org/apache/hadoop/maven/plugin/util/FileSetUtils.java:52: error: unknown tag: File
[ERROR] * @return List containing every element of the FileSet as a File
[ERROR] ^
[ERROR] 
[ERROR] Command line was: /home/ubuntu1/jdk1.8.0_60/jre/../bin/javadoc @options @packages
[ERROR] 
[ERROR] Refer to the generated Javadoc files in '/home/ubuntu1/release-2.3.0/hadoop-maven-plugins/target' dir.
[ERROR] -> [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 -rf :hadoop-maven-plugins

用jdk8会构建错误，需要使用jdk7