Hi All,
Prompted by a question on stackoverflow, I was trying to see if AspectJ can
change the class that is being instantiated. I wouldn't have been
surprised if it cannot be done, but the error I am getting is pretty
strange.
I have two classes R and R1 (extends R) and using an aspect I am trying to
create an R1 instead of R. I stumbled on infinite recursion but when I
tried to work around it by using a thread local, I got error as follows. My
questions:
1. Is it possible to replace object that is (to be) constructed like I am
doing?
2. I am pretty sure the ThreadLocal I am using is not the correct way to
avoid recursion. What is the correct way?
***R.java***
public class R{
public static void main(String[] args) {System.out.println(new
R().getClass().getName());}
}
***R1.java***
public class R1 extends R {}
***RAj.aj***
public aspect RAj
{
private ThreadLocal<Object> inAspect = new ThreadLocal<Object>();
pointcut createR() : execution(R.new());
Object around() : createR()
{
System.out.println("aspect:" + inAspect.get() + ":" + this);
if (inAspect.get() != null)
{
return proceed();
}
else
{
inAspect.set(this);
return new R1();
}
}
}
compile command:
/cygdrive/c/Program\ Files/Java/aspectj-1.6.12/bin/ajc.bat -source 1.7
-outxml -outjar araj.jar -classpath "aspectjrt.jar;." RAj.aj
run:
/cygdrive/c/Program\ Files/Java/aspectj-1.6.12/bin/aj5.bat -classpath
".;./araj.jar" R
errors:
Apr 06, 2012 1:37:40 PM org.aspectj.weaver.tools.Jdk14Trace error
SEVERE: register definition failed
java.lang.RuntimeException: Problem processing attributes in RAj
at
org.aspectj.weaver.bcel.BcelObjectType.ensureAspectJAttributesUnpacked(BcelObjectType.java:385)
at
org.aspectj.weaver.bcel.BcelObjectType.<init>(BcelObjectType.java:162)
at
org.aspectj.weaver.bcel.BcelWorld.buildBcelDelegate(BcelWorld.java:394)
at org.aspectj.weaver.bcel.BcelWorld.resolveDelegate(BcelWorld.java:389)
at org.aspectj.weaver.ltw.LTWWorld.resolveDelegate(LTWWorld.java:107)
at org.aspectj.weaver.World.resolveToReferenceType(World.java:485)
at org.aspectj.weaver.World.resolve(World.java:326)
at
org.aspectj.weaver.bcel.BcelWeaver.addLibraryAspect(BcelWeaver.java:159)
at
org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.registerAspects(ClassLoaderWeavingAdaptor.java:470)
at
org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.registerDefinitions(ClassLoaderWeavingAdaptor.java:295)
at
org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.initialize(ClassLoaderWeavingAdaptor.java:181)
at
org.aspectj.weaver.loadtime.Aj$ExplicitlyInitializedClassLoaderWeavingAdaptor.initialize(Aj.java:277)
at
org.aspectj.weaver.loadtime.Aj$ExplicitlyInitializedClassLoaderWeavingAdaptor.getWeavingAdaptor(Aj.java:282)
at org.aspectj.weaver.loadtime.Aj$WeaverContainer.getWeaver(Aj.java:260)
at org.aspectj.weaver.loadtime.Aj.preProcess(Aj.java:91)
at
org.aspectj.weaver.loadtime.ClassPreProcessorAgentAdapter.transform(ClassPreProcessorAgentAdapter.java:54)
at
sun.instrument.TransformerManager.transform(TransformerManager.java:188)
at
sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:424)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:476)
Caused by: org.aspectj.weaver.BCException: malformed
org.aspectj.weaver.PointcutDeclaration attribute
(length:73)org.aspectj.weaver.BCException: Bad type signature
org.aspectj.weaver.WeaverState
at org.aspectj.weaver.AjAttribute.read(AjAttribute.java:137)
at org.aspectj.weaver.bcel.Utility.readAjAttributes(Utility.java:101)
at
org.aspectj.weaver.bcel.BcelObjectType.ensureAspectJAttributesUnpacked(BcelObjectType.java:381)
... 30 more
[AppClassLoader@1284903] warning register definition failed --
(RuntimeException) Problem processing attributes in RAj
Problem processing attributes in RAj
java.lang.RuntimeException: Problem processing attributes in RAj
at
org.aspectj.weaver.bcel.BcelObjectType.ensureAspectJAttributesUnpacked(BcelObjectType.java:385)
at
org.aspectj.weaver.bcel.BcelObjectType.<init>(BcelObjectType.java:162)
at
org.aspectj.weaver.bcel.BcelWorld.buildBcelDelegate(BcelWorld.java:394)
at org.aspectj.weaver.bcel.BcelWorld.resolveDelegate(BcelWorld.java:389)
at org.aspectj.weaver.ltw.LTWWorld.resolveDelegate(LTWWorld.java:107)
at org.aspectj.weaver.World.resolveToReferenceType(World.java:485)
at org.aspectj.weaver.World.resolve(World.java:326)
at
org.aspectj.weaver.bcel.BcelWeaver.addLibraryAspect(BcelWeaver.java:159)
at
org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.registerAspects(ClassLoaderWeavingAdaptor.java:470)
at
org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.registerDefinitions(ClassLoaderWeavingAdaptor.java:295)
at
org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.initialize(ClassLoaderWeavingAdaptor.java:181)
at
org.aspectj.weaver.loadtime.Aj$ExplicitlyInitializedClassLoaderWeavingAdaptor.initialize(Aj.java:277)
at
org.aspectj.weaver.loadtime.Aj$ExplicitlyInitializedClassLoaderWeavingAdaptor.getWeavingAdaptor(Aj.java:282)
at org.aspectj.weaver.loadtime.Aj$WeaverContainer.getWeaver(Aj.java:260)
at org.aspectj.weaver.loadtime.Aj.preProcess(Aj.java:91)
at
org.aspectj.weaver.loadtime.ClassPreProcessorAgentAdapter.transform(ClassPreProcessorAgentAdapter.java:54)
at
sun.instrument.TransformerManager.transform(TransformerManager.java:188)
at
sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:424)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:476)
Caused by: org.aspectj.weaver.BCException: malformed
org.aspectj.weaver.PointcutDeclaration attribute
(length:73)org.aspectj.weaver.BCException: Bad type signature
org.aspectj.weaver.WeaverState
at org.aspectj.weaver.AjAttribute.read(AjAttribute.java:137)
at org.aspectj.weaver.bcel.Utility.readAjAttributes(Utility.java:101)
at
org.aspectj.weaver.bcel.BcelObjectType.ensureAspectJAttributesUnpacked(BcelObjectType.java:381)
... 30 more
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