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https://issues.apache.org/jira/browse/LUCENE-1510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12661956#action_12661956
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Robert Newson commented on LUCENE-1510:
---------------------------------------
Looks good to me. I wonder if you should add;
private static final byte[] EMPTY = new byte[0];
and refer to that, as your todo suggests?
> InstantiatedIndexReader throws NullPointerException in norms() when used with
> a MultiReader
> -------------------------------------------------------------------------------------------
>
> Key: LUCENE-1510
> URL: https://issues.apache.org/jira/browse/LUCENE-1510
> Project: Lucene - Java
> Issue Type: Bug
> Components: contrib/*
> Affects Versions: 2.4
> Reporter: Robert Newson
> Assignee: Karl Wettin
> Fix For: 2.9
>
> Attachments: TestWithMultiReader.java
>
>
> When using InstantiatedIndexReader under a MultiReader where the other Reader
> contains documents, a NullPointerException is thrown here;
> public void norms(String field, byte[] bytes, int offset) throws IOException
> {
> byte[] norms =
> getIndex().getNormsByFieldNameAndDocumentNumber().get(field);
> System.arraycopy(norms, 0, bytes, offset, norms.length);
> }
> the 'norms' variable is null. Performing the copy only when norms is not null
> does work, though I'm sure it's not the right fix.
> java.lang.NullPointerException
> at
> org.apache.lucene.store.instantiated.InstantiatedIndexReader.norms(InstantiatedIndexReader.java:297)
> at org.apache.lucene.index.MultiReader.norms(MultiReader.java:273)
> at
> org.apache.lucene.search.TermQuery$TermWeight.scorer(TermQuery.java:70)
> at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:131)
> at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:112)
> at org.apache.lucene.search.Searcher.search(Searcher.java:136)
> at org.apache.lucene.search.Searcher.search(Searcher.java:146)
> at
> org.apache.lucene.store.instantiated.TestWithMultiReader.test(TestWithMultiReader.java:41)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at junit.framework.TestCase.runTest(TestCase.java:164)
> at junit.framework.TestCase.runBare(TestCase.java:130)
> at junit.framework.TestResult$1.protect(TestResult.java:106)
> at junit.framework.TestResult.runProtected(TestResult.java:124)
> at junit.framework.TestResult.run(TestResult.java:109)
> at junit.framework.TestCase.run(TestCase.java:120)
> at junit.framework.TestSuite.runTest(TestSuite.java:230)
> at junit.framework.TestSuite.run(TestSuite.java:225)
> at
> org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
> at
> org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
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