[GROOVY-7291] Primitive variables with no initial value expression not given default value when referenced within a closure

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.8.6, 2.2.1, 2.4.0
• Fix Version/s: 2.4.8
• Environment: Windows 8.1, JDK 1.7_71 and 1.8_25
• Assignee: Jochen Theodorou
• Reporter: David Richter
• Created: 06/Feb/15 01:34
• Updated: 06/Feb/18 04:14
• Resolved: 06/Feb/18 04:14

Description

I have problem with following code:

double a;
def b = {
   a = a + 1;
}
b();

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

CallSite[] var1 = $getCallSiteArray();
        final Reference a = new Reference((Double)DefaultTypeTransformation.box(0.0D));
        DefaultTypeTransformation.doubleUnbox(a.get());
...

version 2.2.1

CallSite[] var1 = $getCallSiteArray();
final Reference a = new Reference((Object)null);
Double var10000 = (Double)a.get();
...

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

Issue Links

• links to: GitHub Pull Request #331
• links to: GitHub Pull Request #446