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https://issues.apache.org/jira/browse/GROOVY-11745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18017296#comment-18017296
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ASF GitHub Bot commented on GROOVY-11745:
-----------------------------------------
eric-milles merged PR #2284:
URL: https://github.com/apache/groovy/pull/2284
> Groovy5 calling Groovy4 library with setter throws NPE
> ------------------------------------------------------
>
> Key: GROOVY-11745
> URL: https://issues.apache.org/jira/browse/GROOVY-11745
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 4.0.28, 5.0.0
> Reporter: Aleks Tamarkin
> Assignee: Eric Milles
> Priority: Major
>
> When Groovy5 calls Groovy4 code that sets a property which should be calling
> a setter under the hood, an NPE is thrown.
> The stack looks like
>
> {code:java}
> Exception in thread "main" java.lang.NullPointerException
> at java.base/java.lang.Class.isAssignableFrom(Native Method)
> at groovy.lang.MetaClassImpl.isVisibleProperty(MetaClassImpl.java:2104)
> at groovy.lang.MetaClassImpl.setProperty(MetaClassImpl.java:2761)
> at
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.setProperty(ScriptBytecodeAdapter.java:509){code}
> I am seeing this error fairly randomly on setters.
> One example in the Groovy4 code being called by Groovy5 looks like
> {code:java}
> HttpURLConnection c = "<someUrl>".toURL().openConnection() as
> HttpURLConnection
> ...
> c.useCaches = false // this line has the error{code}
>
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