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Home » Modeling » TMF (Xtext) » NPE after upgrade to 2.5.0
NPE after upgrade to 2.5.0 [message #1235116] Thu, 23 January 2014 15:55 Go to next message
Matthias Spiller is currently offline Matthias SpillerFriend
Messages: 13
Registered: September 2013
Junior Member
Hi,

I get an NPE while the XbaseCompiler is running:

java.lang.NullPointerException
	at org.eclipse.xtext.xbase.compiler.TypeConvertingCompiler.mustInsertTypeCast(TypeConvertingCompiler.java:118)
	at org.eclipse.xtext.xbase.compiler.TypeConvertingCompiler.internalToConvertedExpression(TypeConvertingCompiler.java:91)
	at org.eclipse.xtext.xbase.compiler.TypeConvertingCompiler.internalToJavaExpression(TypeConvertingCompiler.java:71)
	at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler.appendReceiver(FeatureCallCompiler.java:715)
	at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler.featureCalltoJavaExpression(FeatureCallCompiler.java:436)


the call to resolvedTypes.getActualType(expression) returns null.

From what I can see this call had also returned null with xtext 2.4, but had not lead to an error.

Any idea what I can do? Is it correct that getActualType() returns null.
When debugging, I see that it looks into "expressionTypes" of class RootResolvedTypes which is empty.

Let me know what else you need to know from my implementation.

Thanks,
Matthias
Re: NPE after upgrade to 2.5.0 [message #1325587 is a reply to message #1235116] Thu, 01 May 2014 09:25 Go to previous message
Thomas Fritsch is currently offline Thomas FritschFriend
Messages: 28
Registered: April 2013
Location: Germany
Junior Member
I got NPE with same stack-trace after upgrading from Xtext 2.4.3 to 2.5.3.
It happened during generating a Java method body.
Finally it turned out to be a bug in my JvmModelInferrer implementation
(wrong usage of JvmTypesBuilder-methods toClass and newTypeRef).
After fixing this it works fine.

For solving your problem, much more information would be needed
(your grammar, JvmModelInferrer, DSL example to reproduce the problem).
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