What could cause such weird exception?
RAMInputStream.<init>: java.lang.NullPointerException
java.lang.NullPointerException
at org.apache.lucene.store.RAMInputStream.<init>(RAMDirectory.java:217)
at org.apache.lucene.store.RAMDirectory.openFile(RAMDirectory.java:182)
at org.apache.lucene.index.FieldInfos.<init>(FieldInfos.java:78)
at org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:116)
at org.apache.lucene.index.IndexWriter.mergeSegments(IndexWriter.java:378)
at org.apache.lucene.index.IndexWriter.optimize(IndexWriter.java:298)
at org.apache.lucene.index.IndexWriter.addIndexes(IndexWriter.java:313)
I don't know if this is a one off as I cannot reproduce this problem nor I have seen this before, but I thought I could as well ask.
This is triggered by merging a RAMDirectory into a FSDirectory. Looking at the RAMDirectory source code, this exception seems to indicate that the file argument to the RAMInputStream constructor is null... how could that ever happen?
Here is the code which triggers this weirdness:
this.writer().addIndexes( new Directory[] { aRamDirectory } );
The RAM writer is checked before invoking this code to make sure there is some content in the RAM directory:
aRamWriter.docCount() > 0
This has been working very reliably since the dawn of time, so I'm a little bit at loss as how to diagnose this weird exception...
Any ideas?
Thanks.
Cheers,
PA.
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