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https://issues.apache.org/jira/browse/GROOVY-7709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15054619#comment-15054619
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John Wagenleitner commented on GROOVY-7709:
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Just tried with 2.3.6 (before I mostly tested with 2.X.0 point releases) and
confirmed that it throws the NPE.
> NPE with ConvertedClosure
> -------------------------
>
> Key: GROOVY-7709
> URL: https://issues.apache.org/jira/browse/GROOVY-7709
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.4.5
> Reporter: Jochen Theodorou
>
> {code}
> interface Y extends GroovyObject {}
> def cl = {println 1} as Y
> assert cl instanceof GroovyObject
> if (cl) println "!cl"
> {code}
> the code above will cause the execution of the method getMetaClass in the
> boolean part of the "if". It looks like this code path now produces a NPE
> {code}
> java.lang.NullPointerException
> at
> org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:919)
> at
> org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:902)
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToBoolean(DefaultTypeTransformation.java:185)
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.booleanUnbox(DefaultTypeTransformation.java:74){code}
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