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Re: [aspectj-users] Generics and Abstract Pointcut

An NPE from the compiler indicates a bug, not that you are doing
something wrong (want to raise a bugzilla?
https://bugs.eclipse.org/bugs/enter_bug.cgi?product=AspectJ ).  But
you may be able to work around the problem.

> It seems ok to me but when I try to compile it I receive the error below
> (aspectj 1.6.10, aspectjweaver 1.6.1).

Not quite sure what you mean here, are you really combining AspectJ
1.6.10 and a 1.6.1 weaver?  I would recommend trying with everything
at 1.6.11 in case the issue has already been fixed (1.6.11 included a
few generics related fixes for Spring Data).  You could also try
writing your aspect in code style rather than annotation style - but
this would just be a possible workaround, basically you've hit a
compiler issue and it needs fixing.

cheers
Andy.

On 29 June 2011 18:19, Andre Dantas Rocha <andre.dantas.rocha@xxxxxxxxx> wrote:
> Hi all,
>
> I've been struggling to create a very simple interceptor aspect using
> generics and abstract pointcuts. The code is below:
>
> // A simple class using generics
> public abstract class AbstractAdapter<T extends Serializable> {
>    protected abstract T execute(T message);
> }
>
> // The concrete class to be intercepted
> public class Adapter extends AbstractAdapter<String> {
>    @Override
>     public String execute(String message) {
>       return message;
>     }
> }
>
> // The abstract aspect using generics
> @Aspect
> public abstract class AbstractProbingAspect<T> {
>    @Pointcut("")
>    protected abstract void adapterMethodExecution();
>
>    @Around("adapterMethodExecution()")
>    public Object around(ProceedingJoinPoint thisJoinPoint) throws Throwable
> {
>       return thisJoinPoint.proceed();
>    }
>
>    protected abstract String extractFunctionName(T command);
> }
>
> // The concrete aspect
> @Aspect
> public class ProbingAspect extends AbstractProbingAspect<String> {
>    @Pointcut("execution(String test.aop.Adapter.execute(String))")
>    protected void adapterMethodExecution() {};
>
>    @Override
>    protected String extractFunctionName(String command) {
>       return String.valueOf(command);
>    }
> }
>
> It seems ok to me but when I try to compile it I receive the error below
> (aspectj 1.6.10, aspectjweaver 1.6.1). Any ideas about what I'm doing wrong?
>
> Thanks in advance,
>
> Andre
>
> [INFO] --- aspectj-maven-plugin:1.3.1:compile (default) @ test-aop ---
> [ERROR] Internal compiler error
> java.lang.NullPointerException
>    at
> org.aspectj.weaver.ResolvedPointcutDefinition.parameterizedWith(ResolvedPointcutDefinition.java:121)
>    at
> org.aspectj.weaver.ReferenceType.getDeclaredPointcuts(ReferenceType.java:783)
>    at
> org.aspectj.weaver.ResolvedType.getExposedPointcuts(ResolvedType.java:2317)
>    at
> org.aspectj.weaver.ResolvedType.getExposedPointcuts(ResolvedType.java:2310)
>    at
> org.aspectj.ajdt.internal.compiler.lookup.EclipseSourceType.checkPointcutDeclarations(EclipseSourceType.java:462)
>    at
> org.aspectj.ajdt.internal.compiler.lookup.AjLookupEnvironment.resolvePointcutDeclarations(AjLookupEnvironment.java:489)
>    at
> org.aspectj.ajdt.internal.compiler.lookup.AjLookupEnvironment.completeTypeBindings(AjLookupEnvironment.java:279)
>    at
> org.aspectj.org.eclipse.jdt.internal.compiler.Compiler.internalBeginToCompile(Compiler.java:616)
>    at
> org.aspectj.org.eclipse.jdt.internal.compiler.Compiler.beginToCompile(Compiler.java:357)
>    at
> org.aspectj.org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:371)
>    at
> org.aspectj.ajdt.internal.core.builder.AjBuildManager.performCompilation(AjBuildManager.java:1021)
>    at
> org.aspectj.ajdt.internal.core.builder.AjBuildManager.performBuild(AjBuildManager.java:268)
>    at
> org.aspectj.ajdt.internal.core.builder.AjBuildManager.batchBuild(AjBuildManager.java:181)
>    at org.aspectj.ajdt.ajc.AjdtCommand.doCommand(AjdtCommand.java:112)
>    at org.aspectj.ajdt.ajc.AjdtCommand.runCommand(AjdtCommand.java:60)
>    at org.aspectj.tools.ajc.Main.run(Main.java:371)
>    at org.aspectj.tools.ajc.Main.runMain(Main.java:248)
>    at
> org.codehaus.mojo.aspectj.AbstractAjcCompiler.execute(AbstractAjcCompiler.java:370)
>    at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
>    at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
>    at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
>    at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
>    at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
>    at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
>    at
> org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
>    at
> org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
>    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
>    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
>    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
>    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
>    at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>    at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>    at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>    at java.lang.reflect.Method.invoke(Method.java:592)
>    at
> org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
>    at
> org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
>    at
> org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
>    at
> org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
>
>
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