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  1. Groovy
  2. GROOVY-9079

STC: NPE in StaticTypeCheckingVisitor.inferSAMTypeGenericsInAssignment

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 3.0.0-beta-1, 2.5.7
    • Component/s: None
    • Labels:
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      Description

      Consider the following:

      @groovy.transform.CompileStatic
      void meth() {
        java.util.concurrent.Callable<String> call = { -> '' }
      }
      

      This code produces:

      BUG! exception in phase 'instruction selection' in source unit 'Blah.groovy' unexpected NullpointerException
      	at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1148)
      	at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:654)
      	at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:632)
      	at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:609)
      	...
      Caused by: java.lang.NullPointerException
      	at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.inferSAMTypeGenericsInAssignment(StaticTypeCheckingVisitor.java:4282)
      	at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.getResultType(StaticTypeCheckingVisitor.java:4133)
      	at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.visitBinaryExpression(StaticTypeCheckingVisitor.java:831)
      	...
      

      The method in StaticTypeCheckingVisitor calls ClosureExpression.getParameters(), which returns null for a closure expression like "

      { -> '' }

      ".

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            • Assignee:
              paulk Paul King
              Reporter:
              emilles Eric Milles
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              • Created:
                Updated:
                Resolved: