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From "Abhijit Suresh Shingate (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2331) Hdfs compilation fails
Date Wed, 14 Sep 2011 09:49:09 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13104391#comment-13104391
] 

Abhijit Suresh Shingate commented on HDFS-2331:
-----------------------------------------------

Thanks Nicholas, 

The patch is attached.

Regards,
Abhijit

> 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
>         Attachments: HDFS-2331.patch
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> I am trying to perform complete 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] \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 fix to the 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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