[jira] [Created] (TAP5-2127) Access of Groovy field varies with configured production mode when accessing field inside closure

["Uriah Carpenter (JIRA)" <ji...@apache.org>]

Uriah Carpenter created TAP5-2127:
-------------------------------------

             Summary: Access of Groovy field varies with configured production mode when accessing field inside closure 
                 Key: TAP5-2127
                 URL: https://issues.apache.org/jira/browse/TAP5-2127
             Project: Tapestry 5
          Issue Type: Bug
          Components: plastic
    Affects Versions: 5.3.7
            Reporter: Uriah Carpenter
            Priority: Critical


Create a Groovy page class that contains a field that has private access. Within a method, set the field to an initial value; use a Groovy closure to access the field.

When running with production-mode = FALSE everything works correctly.

When running with production-mode = TRUE an NPE will be thrown when accessing the field from inside the closure.

This commit shows the an example of the problem: https://github.com/Widen/tapestry5-idea/commit/9cb5be82db6ea917238aaf7e7b3f3e6067681913

You can download and run the example from https://github.com/Widen/tapestry5-idea

Tested with Groovy version 2.0.8 and Tapestry 5.3.7

The error stack trace is:
<code>
Caused by: java.lang.NullPointerException: Cannot invoke method leftShift() on null object
	at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:77) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:45) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:32) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116) ~[groovy-all-2.0.8.jar:2.0.8]
	at com.example.plaid.pages.PersistBug$_getOutput_closure1.doCall(PersistBug.groovy:32) ~[tapestry5-idea/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.6.0_45]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ~[na:1.6.0_45]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[na:1.6.0_45]
	at java.lang.reflect.Method.invoke(Method.java:597) ~[na:1.6.0_45]
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90) ~[groovy-all-2.0.8.jar:2.0.8]
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:272) ~[groovy-all-2.0.8.jar:2.0.8]
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:906) ~[groovy-all-2.0.8.jar:2.0.8]
	at groovy.lang.Closure.call(Closure.java:412) ~[groovy-all-2.0.8.jar:2.0.8]
	at groovy.lang.Closure.call(Closure.java:425) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:1326) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:1298) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.dgm$148.invoke(Unknown Source) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoMetaMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:271) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:53) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108) ~[groovy-all-2.0.8.jar:2.0.8]
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116) ~[groovy-all-2.0.8.jar:2.0.8]
	at com.example.plaid.pages.PersistBug.getOutput(PersistBug.groovy:27) ~[tapestry5-idea/:na]
	at $InternalPropertyConduit_13053058e1131f47.get(Unknown Source) ~[na:na]
	at org.apache.tapestry5.internal.bindings.PropBinding.get(PropBinding.java:59) ~[tapestry-core-5.3.7.jar:na]
</code>

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