StanfordParser may fail with NPE #783
Description
Some problem here:
Caused by: java.lang.NullPointerException
at de.tudarmstadt.ukp.dkpro.core.stanfordnlp.util.TreeWithTokens.setTree(TreeWithTokens.java:54)
at de.tudarmstadt.ukp.dkpro.core.stanfordnlp.util.TreeWithTokens.<init>(TreeWithTokens.java:48)
at de.tudarmstadt.ukp.dkpro.core.stanfordnlp.StanfordParser.process(StanfordParser.java:407)
at org.apache.uima.analysis_component.JCasAnnotator_ImplBase.process(JCasAnnotator_ImplBase.java:48)
at org.apache.uima.analysis_engine.impl.PrimitiveAnalysisEngine_impl.callAnalysisComponentProcess(PrimitiveAnalysisEngine_impl.java:385)
... 13 more
Apparently the tree object returned by the parser can be null:
de.tudarmstadt.ukp.dkpro.core.stanfordnlp.StanfordParser
parseTree = query.getBestParse();
...
sfAnnotator = new StanfordAnnotator(new TreeWithTokens(parseTree, tokens));
de.tudarmstadt.ukp.dkpro.core.stanfordnlp.util.TreeWithTokens
public void setTree(Tree tree)
{
if (!(tree.label() instanceof CoreLabel)) {
tree = tree.deepCopy(tree.treeFactory(), CoreLabel.factory());
}