[groovy-user] NPE for correct code in Groovy web console - 1.8 issue?

[Evgeny Goldin]

http://groovyconsole.appspot.com/script/275001:

class LockableList
{
@Delegate private List list = []
}
 
assert new LockableList() instanceof List

causes:

java.lang.NullPointerException
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:321)
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:303)
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:351)
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:172)
	at com.sun.beans.TypeResolver.resolveInClass(TypeResolver.java:93)
	at Script1.run(Script1.groovy:6)

If I comment out an assert then I get:

java.lang.NullPointerException
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:321)
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:303)
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:351)
	at com.sun.beans.TypeResolver.resolve(TypeResolver.java:172)
	at com.sun.beans.TypeResolver.resolveInClass(TypeResolver.java:93)
	at LockableList.$getStaticMetaClass(Script1.groovy)
	at LockableList.(Script1.groovy:3)

Can it be Groovy 1.8 beta issue? It works fine in GroovyConsole v1.7.5.

Best regards,
Evgeny
http://evgeny-goldin.com/

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[roshan...@gmail.com]

This is something specific to OpenJDK and not groovy 1.7 or 1.8 - if you run the same @Delegate code on groovy web console version that has 1.7.x, you will get the same error.

I have fixed this issue already in 1.8-beta-3 and 1.7.6.

Web console is on 1.8-beta-2 and I requested its upgrade to 1.8-beta-3, but so far it has not been done.

So waiting for it.

---------------------------------------------------
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From: Evgeny Goldin <evg...@gmail.com>

Date: Tue, 12 Oct 2010 15:49:43 -0700 (PDT)

To: <us...@groovy.codehaus.org>

ReplyTo: us...@groovy.codehaus.org

Subject: [groovy-user] NPE for correct code in Groovy web console - 1.8 issue?

[Evgeny Goldin]

I see. Thank you for the update!

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[Guillaume Laforge]

Roshan,

I've updated the Groovy Web Console with Groovy 1.8-beta-3-SNAPSHOT.
The @Delegate issue disapeared :-)

Guillaume

On Wed, Oct 13, 2010 at 04:38, <roshan...@gmail.com> wrote:

--
Guillaume Laforge
Groovy Project Manager
Head of Groovy Development at SpringSource
http://www.springsource.com/g2one

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[Guillaume Laforge]

So if you want to test the script on the console:

http://groovyconsole.appspot.com/edit/275001

And if you want to use 1.7.5, where it's failing:
http://175.latest.groovyconsole.appspot.com/edit/275001

You'll notice that we now have a version of the console with Groovy
1.8-beta-3 snapshot, and one with Groovy 1.7.5 :-)

Guillaume

[Tim Yates]

Cool :-)

Looks like parsing may have changed though...

The basic interpreter on the webconsole now needs line 83 changing from:

    if( get(0).type == type1 && get(1).type == type2 ) token += 2 else false

to

    if( get(0).type == type1 && get(1).type == type2 ) { token += 2 } else false

Otherwise, you get:

Script1.groovy: 83: unexpected token: else @ line 83, column 67.
   1).type == type2 ) token += 2 else false

Tim

[Guillaume Laforge]

Interesting...
Could you file a JIRA issue please?

[Roshan Dawrani]

Generics related fix done for OpenJDK (6 / 7) has nothing to with groovy grammar.

If you are noticing any grammar related side-effect, it may be due to some other fix made in that area and someone may trace it down for you, if it matters much. Or you can report it separately.

--
rgds,
Roshan
http://roshandawrani.wordpress.com/
http://twitter.com/roshandawrani

[Guillaume Laforge]

This is perhaps due to the GEP-3 changes.
To be confirmed.

[Tim Yates]

Done :-)

http://jira.codehaus.org/browse/GROOVY-4480

It's only a minor thing, but could be indicative of a change that wasn't meant to occur?

Tim

[Guillaume Laforge]

On Fri, Oct 15, 2010 at 15:57, Tim Yates <tim....@gmail.com> wrote:
> Done :-)
>
> http://jira.codehaus.org/browse/GROOVY-4480

Thanks.

> It's only a minor thing, but could be indicative of a change that wasn't
> meant to occur?

I think so too :-)

[Evgeny Goldin]

Here's another code that works with 1.7.5 and fails in Groovy web console
(can't post it now, the console seems malfunctioning as it doesn't show
recent posts and doesn't accept a new ones)

Number.metaClass.m = { amount -> ( delegate.multiply( amount )) }
Number.metaClass.d = { amount -> ( delegate.div( amount )) }

assert 15 == 3.m( 5 )
assert 5.3333333333 == 16.d( 3 )

The exception is

groovy.lang.MissingMethodException: No signature of method:
java.lang.Integer.times() is applicable for argument types:
(java.lang.Integer) values: [3]
Possible solutions: times(groovy.lang.Closure), power(java.lang.Integer),
is(java.lang.Object), minus(java.lang.Number), minus(java.lang.Character),
abs()
at Script1$_run_closure1.doCall(Script1.groovy:1)
at Script1$_run_closure1.doCall(Script1.groovy:1)
at Script1.run(Script1.groovy:5)

-----

Best regards,
Evgeny
http://evgeny-goldin.com/

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[Roshan Dawrani]

Seems to be working fine. Can't get the error you reported - http://groovyconsole.appspot.com/script/285001

Even your 2 scripts seem to be published fine there on the web console and both work. Or, am I imagining things? :-)

--
rgds,
Roshan
http://roshandawrani.wordpress.com/
http://twitter.com/roshandawrani

[Evgeny Goldin]

Hmm, it works now indeed. 

Probably, there was some temporal issue with web console.

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