clean install的时候发生致命错误

```text
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ yaycrawler-dao ---
[INFO] Deleting /Users/leo/Documents/git/YayCrawler/yaycrawler.dao/target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ yaycrawler-dao ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ yaycrawler-dao ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 24 source files to /Users/leo/Documents/git/YayCrawler/yaycrawler.dao/target/classes
致命错误: 在类路径或引导类路径中找不到程序包 java.lang
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] An unknown compilation problem occurred
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] yaycrawler.common .................................. SUCCESS [  2.115 s]
[INFO] yaycrawler-cache ................................... SUCCESS [  0.124 s]
[INFO] yaycrawler-dao ..................................... FAILURE [  0.166 s]
[INFO] yaycrawler.monitor ................................. SKIPPED
[INFO] yaycrawler.spider .................................. SKIPPED
[INFO] yaycrawler.quartz .................................. SKIPPED
[INFO] yaycrawler-admin ................................... SKIPPED
[INFO] yaycrawler.master .................................. SKIPPED
[INFO] yaycrawler.worker .................................. SKIPPED
[INFO] yaycrawler.proxy ................................... SKIPPED
[INFO] yaycrawler.ftpserver ............................... SKIPPED
[INFO] YayCrawler ......................................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.272 s
[INFO] Finished at: 2016-09-08T18:51:26+08:00
[INFO] Final Memory: 71M/451M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project yaycrawler-dao: Compilation failure
[ERROR] An unknown compilation problem occurred
[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/MojoFailureException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :yaycrawler-dao
```

代码神童/YayCrawler

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