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https://issues.apache.org/jira/browse/GROOVY-7291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15579622#comment-15579622
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Jochen Theodorou commented on GROOVY-7291:
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in this case it was ok, since the bug is not fixed and the version is not 
released yes

> Declaration of double variable without value assignment referrenced in closure
> ------------------------------------------------------------------------------
>
>                 Key: GROOVY-7291
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7291
>             Project: Groovy
>          Issue Type: Bug
>    Affects Versions: 1.8.6, 2.2.1, 2.4.0
>         Environment: Windows 8.1, JDK 1.7_71 and 1.8_25
>            Reporter: David Richter
>            Assignee: John Wagenleitner
>            Priority: Critical
>         Attachments: groovyBug.zip
>
>
> I have problem with following code:
> {code}
> double a;
> def b = {
>    a = a + 1;
> }
> b();
> {code}
> I tried to compile it with groovy 1.8.6 and it worked 
> variable 'a' was instantiated with value 0.0
> but after upgrade to groovy 2.2.1
> it throws NullPointerException because variable 'a' is instantiated to null
> I tried to decompile class files and declaration of 'a' looked like this:
> version 1.8.6
> {noformat}
> CallSite[] var1 = $getCallSiteArray();
>         final Reference a = new 
> Reference((Double)DefaultTypeTransformation.box(0.0D));
>         DefaultTypeTransformation.doubleUnbox(a.get());
> ...
> {noformat}
> version 2.2.1
> {noformat}
> CallSite[] var1 = $getCallSiteArray();
> final Reference a = new Reference((Object)null);
> Double var10000 = (Double)a.get();
> ...
> {noformat}
> I tried it also with version 2.4.0 but it has same result as 2.2.1
> In attachment are groovy classes, compiled classes and consoleOutputs for 
> versions 1.8.6 and 2.2.1



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