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From Jörn Kottmann <kottm...@gmail.com>
Subject NPE from ArrayFS.get method
Date Wed, 16 Jan 2013 11:14:02 GMT
Hi all,

I am getting a NullPointerException while calling ArrayFS.get().

Here is the exception:
     at org.apache.uima.cas.impl.CASImpl.ll_getFSForRef(CASImpl.java:3117)
     at org.apache.uima.cas.impl.CASImpl.createFS(CASImpl.java:1773)
     at org.apache.uima.cas.impl.ArrayFSImpl.get(ArrayFSImpl.java:50)

The code causing this exception looks like this:
ArrayFS mentionArray = (ArrayFS) 

for (int i = 0; i < mentionArray.size(); i++) {
   AnnotationFS mentionAnn = (AnnotationFS) mentionArray.get(i);

The actual bug here is in the AE which is creating the array and filling
it with Feature Structures a few nodes before in the pipeline.
In that AE the scope of a variable was wrong (instance instead of local)
and it accidentally wrote FSes from another CAS passed previously to the
process method into the ArrayFS.

I am wondering if it would be worth making mistakes like this fail fast,
with other words it should throw an exception while putting the dangling FS
into the array.

Any opinions?


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