XMLReaderManager.releaseXMLReader(reader) - null pointer exception
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Key: XALANJ-2105
URL: http://issues.apache.org/jira/browse/XALANJ-2105
Project: XalanJ2
Type: Bug
Reporter: Brian Minchau
In a program that is too large to attach, this exception happened:
javax.xml.transform.TransformerException: Variable var13 is
directly or indirectly referencing itself!
at org.apache.xalan.transformer.MsgMgr.error(MsgMgr.java:309)
at org.apache.xalan.transformer.MsgMgr.error(MsgMgr.java:212)
at org.apache.xalan.templates.XUnresolvedVariable.execute
(XUnresolvedVariable.java:107)
at org.apache.xpath.VariableStack.getGlobalVariable
(VariableStack.java:446)
at org.apache.xpath.operations.Variable.execute(Variable.java:212)
at org.apache.xpath.operations.Variable.execute(Variable.java:186)
at org.apache.xpath.functions.FunctionDef1Arg.getArg0AsString
(FunctionDef1Arg.java:95)
at org.apache.xpath.functions.FuncNormalizeSpace.execute
(FuncNormalizeSpace.java:46)
at org.apache.xpath.functions.FuncSubstringAfter.execute
(FuncSubstringAfter.java:45)
at org.apache.xpath.XPath.execute(XPath.java:335)
at org.apache.xalan.templates.ElemVariable.getValue
(ElemVariable.java:278)
at org.apache.xalan.templates.ElemVariable.execute
(ElemVariable.java:246)
at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates
(TransformerImpl.java:2346)
at org.apache.xalan.templates.ElemTemplate.execute
(ElemTemplate.java:392)
at org.apache.xalan.templates.ElemCallTemplate.execute
(ElemCallTemplate.java:246)
at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates
(TransformerImpl.java:2346)
at org.apache.xalan.templates.ElemChoose.execute(ElemChoose.java:116)
at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes
(ElemApplyTemplates.java:393)
at org.apache.xalan.templates.ElemApplyTemplates.execute
(ElemApplyTemplates.java:176)
at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates
(TransformerImpl.java:2346)
at org.apache.xalan.templates.ElemLiteralResult.execute
(ElemLiteralResult.java:681)
It appeared that some RTF (result tree fragment) processing was failing while
evaluating var13.
Investigation showed that this failure occured due to an earlier null pointer
exception in:
org.apache.xml.utils.XMLReaderManager.releaseXMLReader(reader);
The problem occurs when reader is null, and the code throws a null pointer
exception when trying to remove null from the Hashtable. My program works fine
if the body of that method has this statement:
if (m_readers.get() == reader)
{
m_inUse.remove(reader);
}
changed to:
if (m_readers.get() == reader && reader != null)
{
m_inUse.remove(reader);
}
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