Java compile error - Nullpointer exception

[Thibaut]

Hi,

I'm trying to use play together with katta (0.6-dev from trunk) (katta.sourceforge.net).

The following code will make the play java compiler fail (play precompile Testproject) with a nullpointer exception. I attached the necessary katta library in order to run the test case!

import java.lang.reflect.Method;
import java.util.Arrays;

import net.sf.katta.client.Client;
import net.sf.katta.client.ClientResult;
import net.sf.katta.client.INodeSelectionPolicy;
import net.sf.katta.lib.lucene.DocumentFrequencyWritable;
import net.sf.katta.lib.lucene.ILuceneClient;
import net.sf.katta.lib.lucene.LuceneClient;
import net.sf.katta.lib.lucene.QueryWritable;
import net.sf.katta.util.ClientConfiguration;
import net.sf.katta.util.KattaException;
import net.sf.katta.util.ZkConfiguration;

import org.apache.log4j.Logger;

/**
 * Default implementation of {@link ILuceneClient}.
 */
public class CompileError extends LuceneClient {

 protected final static Logger LOG = Logger.getLogger(TrendsearchClient.class);
 private final static long TIMEOUT = 12000;
}

java.lang.NullPointerException
        at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.getMemberT
ype(BinaryTypeBinding.java:606)
        at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getTypeFro
mTypeSignature(LookupEnvironment.java:898)
        at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getTypeFro
mVariantTypeSignature(LookupEnvironment.java:936)
        at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getTypeArg
umentsFromSignature(LookupEnvironment.java:754)
        at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getTypeFro
mTypeSignature(LookupEnvironment.java:887)
        at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.cacheParts
From(BinaryTypeBinding.java:240)
        at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.createBina
ryTypeFrom(LookupEnvironment.java:486)
        at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.createBina
ryTypeFrom(LookupEnvironment.java:465)
        at org.eclipse.jdt.internal.compiler.Compiler.accept(Compiler.java:190)
        at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType
(LookupEnvironment.java:99)
        at org.eclipse.jdt.internal.compiler.lookup.UnresolvedReferenceBinding.r
esolve(UnresolvedReferenceBinding.java:43)
        at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.resolveTyp
e(BinaryTypeBinding.java:51)
        at org.eclipse.jdt.internal.compiler.lookup.PackageBinding.getTypeOrPack
age(PackageBinding.java:167)
        at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.findImp
ort(CompilationUnitScope.java:403)
        at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.findSin
gleImport(CompilationUnitScope.java:456)
        at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.faultIn
Imports(CompilationUnitScope.java:321)
        at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.faultIn
Types(CompilationUnitScope.java:390)
        at org.eclipse.jdt.internal.compiler.Compiler.process(Compiler.java:497)

        at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:329)

        at play.classloading.ApplicationCompiler.compile(ApplicationCompiler.jav
a:262)
        at play.classloading.ApplicationClassloader.getAllClasses(ApplicationCla
ssloader.java:334)
        at play.Play.preCompile(Play.java:408)
        at play.Play.init(Play.java:236)
        at play.server.Server.main(Server.java:83)

[Thibaut (thibaut-blue)]

When I include that file (haven't tested with the stripped down version from above), play will also complain about @Override tags in my own application files.

[Guillaume Bort (guillaume-bort)]

If you just remove the

import net.sf.katta.client.ClientResult;

line, then it works.

How was compiled this jar ? It seems that there is a bad binary somewhere (around the ClientResult.class) that make the eclipse compiler fail.

[Thibaut (thibaut-blue)]

To compile katta:

git clone git://katta.git.sourceforge.net/gitroot/katta/katta
cd katta;
ant dist

The result will be in build/katta-core-0.6-rc1.tar.gz. Just take the katta-0.6-rc1.jar out of it. (http://trendiction.com/tmp/katta-core-0.6-rc1.tar.gz)

The error still persists, also with the new jar from the zip file above.

Btw, play will just start fine, if I build a jar of all my play source application files first, and the put that jar into the play lib dir. But I loose JIT editing of the source files then, and have to copy jar files around on each change.
I couldn't check if katta works in that combination as I don't have katta running on my develop machine.

[Thibaut (thibaut-blue)]

Could it be related to katta (supposedly, not checked) being compiled into 1.6 class files, while I somewhere read that play generates 1.5 class files by default?

[Guillaume Bort (guillaume-bort)]

Yes possible. We'll fix that soon.

On 24 janv. 2010, at 18:48, Thibaut <email address hidden> wrote:

> Could it be related to katta (supposedly, not checked) being compiled
> into 1.6 class files, while I somewhere read that play generates 1.5
> class files by default?
>
> --
> Java compile error - Nullpointer exception
> https://bugs.launchpad.net/bugs/504848
> You received this bug notification because you are subscribed to play
> framework.

[Thibaut (thibaut-blue)]

The newest eclipse compiler jar from (http://apache.multihomed.net/tomcat/tomcat-6/v6.0.24/bin/apache-tomcat-6.0.24.zip) seems to fix the problem, without having to set the target to 1.6.

[Guillaume Bort (guillaume-bort)]

Ok, I've updated the eclipse compiler. Let me know.