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Posted to common-dev@hadoop.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2006/09/13 05:54:23 UTC
[jira] Resolved: (HADOOP-104) Reflexive access to non-public class
with public ctor requires setAccessible (with some JVMs)
[ http://issues.apache.org/jira/browse/HADOOP-104?page=all ]
Owen O'Malley resolved HADOOP-104.
----------------------------------
Fix Version/s: 0.5.0
Resolution: Duplicate
Assignee: Hairong Kuang
> Reflexive access to non-public class with public ctor requires setAccessible (with some JVMs)
> ---------------------------------------------------------------------------------------------
>
> Key: HADOOP-104
> URL: http://issues.apache.org/jira/browse/HADOOP-104
> Project: Hadoop
> Issue Type: Bug
> Reporter: Michel Tourn
> Assigned To: Hairong Kuang
> Fix For: 0.5.0
>
> Attachments: setaccessible.patch
>
>
> Multiple times I have hit this problem which prevents the NameNode from starting.
> The only fix I had so far was to loose all my DFS data...
> Exception in thread "main" java.lang.RuntimeException: java.lang.IllegalAccessException:
> Class org.apache.hadoop.io.WritableFactories can not access a member of
> class org.apache.hadoop.dfs.Block with modifiers "public"
> at org.apache.hadoop.io.WritableFactories.newInstance(WritableFactories.java:49)
> at org.apache.hadoop.io.ArrayWritable.readFields(ArrayWritable.java:81)
> at org.apache.hadoop.dfs.FSDirectory.loadFSEdits(FSDirectory.java:374)
> at org.apache.hadoop.dfs.FSDirectory.loadFSImage(FSDirectory.java:347)
> at org.apache.hadoop.dfs.FSDirectory.<init>(FSDirectory.java:258)
> at org.apache.hadoop.dfs.FSNamesystem.<init>(FSNamesystem.java:151)
> at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:82)
> According to this,
> http://forum.java.sun.com/thread.jspa?threadID=704100&messageID=4082902
> this is a known issue when using
> reflexive access to a non-public class with public ctor
> (class org.apache.hadoop.dfs.Block is such a class)
> This problem may not occur with all JVM releases.
> (I build on 1.5.0-b64 and run on 1.5.0_05-b05)
> This problem only occured for me when
> I upgrade code or change XML configuration AND
> have existing files in the DFS.
> This problem does not occur when I just stop / restart the NameServer.
> In any case, the attached patch fixes it by calling setAccessible
> before constructing the instance with reflection.
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