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From "Sameer Paranjpye (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-217) IllegalAcessException when creating a Block object via WritableFactories
Date Tue, 30 May 2006 21:00:30 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-217?page=comments#action_12413899 ] 

Sameer Paranjpye commented on HADOOP-217:
-----------------------------------------

This does not appear to hamper normal DFS operation in any way. Looks like the Block constructor
is registered as a writable factory but is not public. Does it need to be? Should Block objects
ever be constructed this way?

This needs further investigation, making the constructor public just addresses the symptom,
not the problem IMO. Need to figure out what part of the code is trying to create blocks through
a writable factory, and should it be doing that or something different?



> IllegalAcessException when creating a Block object via WritableFactories
> ------------------------------------------------------------------------
>
>          Key: HADOOP-217
>          URL: http://issues.apache.org/jira/browse/HADOOP-217
>      Project: Hadoop
>         Type: Bug

>   Components: dfs
>     Versions: 0.3
>     Reporter: Hairong Kuang
>     Assignee: Hairong Kuang
>      Fix For: 0.4
>  Attachments: access.patch
>
> When I ran the dfs namenode, I received an error message listed below. Changing Block
class to be public will be able to fix the problem.
> 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"
> 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.ObjectWritable.readObject(ObjectWritable.java:226)
>         at org.apache.hadoop.io.ObjectWritable.readObject(ObjectWritable.java:163)
>         at org.apache.hadoop.io.ObjectWritable.readObject(ObjectWritable.java:211)
>         at org.apache.hadoop.ipc.RPC$Invocation.readFields(RPC.java:88)
>         at org.apache.hadoop.ipc.Server$Connection.run(Server.java:154)
> Caused by: 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 sun.reflect.Reflection.ensureMemberAccess(Reflection.java:65)
>         at java.lang.Class.newInstance0(Class.java:344)
>         at java.lang.Class.newInstance(Class.java:303)
>         at org.apache.hadoop.io.WritableFactories.newInstance(WritableFactories.java:45)
>         ... 5 more

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