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From "Abhijit Suresh Shingate (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2331) Hdfs compilation fails
Date Wed, 14 Sep 2011 03:26:08 GMT
Hdfs compilation fails
----------------------

                 Key: HDFS-2331
                 URL: https://issues.apache.org/jira/browse/HDFS-2331
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: build
    Affects Versions: 0.23.0, 0.24.0
            Reporter: Abhijit Suresh Shingate


I am trying to perform completed build from trunk folder but the compilation fails.

*Commandline:*
mvn clean install  

*Error Message:*

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.
3.2:compile (default-compile) on project hadoop-hdfs: Compilation failure
[ERROR] \iSAP\Hadoop\SVN\trunk\hadoop-hdfs-project\hadoop-hdfs\src\main\java\org
\apache\hadoop\hdfs\web\WebHdfsFileSystem.java:[209,21] type parameters of <T>T
cannot be determined; no unique maximal instance exists for type variable T with
 upper bounds T,java.lang.Object
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e swit
ch.
[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 rea
d the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureExc
eption
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command


This is because of known reason
[http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6302954]



{code:title=WebHdfsFileSystem.java|borderStyle=solid}

Following is the code snippet with issue.

  private <T> T run(final HttpOpParam.Op op, final Path fspath,
      final Param<?,?>... parameters) throws IOException {
    final HttpURLConnection conn = httpConnect(op, fspath, parameters);
    validateResponse(op, conn);
    try {
      return jsonParse(conn.getInputStream());
    } finally {
      conn.disconnect();
    }
  }

{code} 


Fix to the issue


{code:title=WebHdfsFileSystem.java|borderStyle=solid}

Following is the code snippet with issue.

  private <T> T run(final HttpOpParam.Op op, final Path fspath,
      final Param<?,?>... parameters) throws IOException {
    final HttpURLConnection conn = httpConnect(op, fspath, parameters);
    validateResponse(op, conn);
    try {
      return WebHdfsFileSystem.<T>jsonParse(conn.getInputStream());
    } finally {
      conn.disconnect();
    }
  }

{code} 



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