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https://issues.apache.org/jira/browse/GROOVY-11745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18018429#comment-18018429
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Aleks Tamarkin edited comment on GROOVY-11745 at 9/5/25 4:00 PM:
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If it helps at all, When stopping it in the debugger
in *setProperty* of *ScriptBytecodeAdapter* - I see that *messageArgument* is
*false* and *senderClass* is *null* and *reciever* is *HttpURLConnection*
**
{code:java}
receiver instanceof GroovyObject {code}
{*}{*}evaluates to *false*
the error is eventually in *isVisibleProperty* ends up being that *sender* is
*null*
was (Author: aibolit):
If it helps at all, When stopping it in the debugger
in *setProperty* of *ScriptBytecodeAdapter* - I see that *messageArgument* is
*false* and *senderClass* is *null* and *reciever* is *HttpURLConnection*
**
{code:java}
receiver instanceof GroovyObject {code}
{*}{*}evaluates to *false*
the error is eventually in *isVisibleProperty* ends up being that *sender* is
*null*
> 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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