[
https://issues.apache.org/jira/browse/JENA-86?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andy Seaborne reassigned JENA-86:
---------------------------------
Assignee: Andy Seaborne
> NPE in BlockMgrCache in direct mode
> -----------------------------------
>
> Key: JENA-86
> URL: https://issues.apache.org/jira/browse/JENA-86
> Project: Jena
> Issue Type: Bug
> Components: TDB
> Reporter: Simon Helsen
> Assignee: Andy Seaborne
> Priority: Critical
>
> There seems to be a problem with the implementation of getWrite in
> BlockMgrCache. Whenever there is a write and read cache miss, the code does
> not actually delegate to the wrapped BlockMgr. In direct mode, this would
> have to be the file system. The resulting exception is
> java.lang.NullPointerException
> at
> com.hp.hpl.jena.tdb.base.page.PageBlockMgr.getWrite(PageBlockMgr.java:50)
> at
> com.hp.hpl.jena.tdb.index.bplustree.BPTreeNode.getMgrWrite(BPTreeNode.java:162)
> at
> com.hp.hpl.jena.tdb.index.bplustree.BPTreeNode.get(BPTreeNode.java:145)
> at
> com.hp.hpl.jena.tdb.index.bplustree.BPTreeNode.delete(BPTreeNode.java:227)
> at
> com.hp.hpl.jena.tdb.index.bplustree.BPlusTree.deleteAndReturnOld(BPlusTree.java:324)
> at
> com.hp.hpl.jena.tdb.index.bplustree.BPlusTree.delete(BPlusTree.java:318)
> at
> com.hp.hpl.jena.tdb.index.TupleIndexRecord.performDelete(TupleIndexRecord.java:55)
> at
> com.hp.hpl.jena.tdb.index.TupleIndexBase.delete(TupleIndexBase.java:61)
> at com.hp.hpl.jena.tdb.index.TupleTable.delete(TupleTable.java:108)
> at
> com.hp.hpl.jena.tdb.graph.BulkUpdateHandlerTDB.removeWorker(BulkUpdateHandlerTDB.java:136)
> at
> com.hp.hpl.jena.tdb.graph.BulkUpdateHandlerTDB.removeAll(BulkUpdateHandlerTDB.java:90)
> at com.hp.hpl.jena.rdf.model.impl.ModelCom.removeAll(ModelCom.java:315)
> I think the fix is to change the following code in the getWrite method of
> BlockMgrCache (starting at line 158):
> // Did not find.
> cacheMisses++ ;
> log("Miss/w: %d", id) ;
> if ( writeCache != null )
> writeCache.put(id, blk) ;
> return blk ;
> into
> // Did not find.
> cacheMisses++ ;
> log("Miss/w: %d", id) ;
> blk = super.getWrite(id);
> if ( writeCache != null )
> writeCache.put(id, blk) ;
> return blk ;
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
