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Bug #3176

closed

NullPointerException when parsing invalid regex

Added by Daniel Schmidt about 7 years ago. Updated about 7 years ago.

Status:
Resolved
Priority:
Low
Assignee:
Michael Kay
Category:
Diagnostics
Sprint/Milestone:
-
Start date:
2017-03-20
Due date:
% Done:

0%

Estimated time:
Legacy ID:
Applies to branch:
9.6
Fix Committed on Branch:
9.6
Fixed in Maintenance Release:
Platforms:

Description

When compiling the attached stylesheet (npe.xsl), an internal NullPointerException is thrown:

java.lang.NullPointerException: NullPointerException processing net.sf.saxon.expr.ErrorExpression
        at net.sf.saxon.expr.Expression.getConfiguration(Expression.java:829)
        at net.sf.saxon.expr.Atomizer.getItemType(Atomizer.java:349)
        at net.sf.saxon.expr.parser.TypeChecker.staticTypeCheck(TypeChecker.java:193)
        at net.sf.saxon.expr.instruct.Choose.staticTypeCheck(Choose.java:350)
        at net.sf.saxon.expr.parser.TypeChecker.staticTypeCheck(TypeChecker.java:85)
        at net.sf.saxon.style.SourceBinding.checkAgainstRequiredType(SourceBinding.java:322)
        at net.sf.saxon.style.SourceBinding.postValidate(SourceBinding.java:246)
        at net.sf.saxon.style.XSLGlobalVariable.postValidate(XSLGlobalVariable.java:84)
        at net.sf.saxon.style.StyleElement.validateSubtree(StyleElement.java:1563)
        at net.sf.saxon.style.StylesheetPackage.preprocess(StylesheetPackage.java:444)
        at net.sf.saxon.style.Compilation.compilePackage(Compilation.java:180)
        at net.sf.saxon.style.Compilation.compileSingletonPackage(Compilation.java:94)
        at net.sf.saxon.s9api.XsltCompiler.compile(XsltCompiler.java:543)
        at net.sf.saxon.Transform.doTransform(Transform.java:601)
        at net.sf.saxon.Transform.main(Transform.java:80)
Fatal error during transformation: java.lang.NullPointerException: NullPointerException processing net.sf.saxon.expr.ErrorExpression

This bug does not exist in Version 9.7.0.15 but in 9.6.0.10

Version 9.7.0.15 generates the correct warning:

Warning at char 61 in xsl:variable/@select on line 10 column 44 of npe.xsl:
  SXWN9000: Evaluation will always throw a dynamic error: The regular expression must not be
  one that matches a zero-length string

Files

npe.xsl (363 Bytes) npe.xsl Daniel Schmidt, 2017-03-20 15:45
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 #1

Updated by Michael Kay about 7 years ago

  • Category set to Diagnostics
  • Assignee set to Michael Kay
  • Applies to branch 9.6 added

Thanks for letting us know. The 9.6 branch is now in a state where we will still consider producing bug fixes, but only if the bug is causing serious inconvenience. A failure that only occurs on an error path doesn't fall into that category, so this is likely to be a "won't fix".

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 #2

Updated by Michael Kay about 7 years ago

  • Status changed from New to Resolved
  • Fix Committed on Branch 9.6 added

I've patched this on the 9.6 branch, just in case we ever produce another maintenance release. More importantly, I've checked that the underlying problem seems to be solved in 9.7 and 9.8. (It remains a fragile area, ensuring that the expression tree is always consistent and complete after a local rewrite, but there are more checks now in place.)

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