ERROR: while transforming .. null

[Ahmet Özkök]

Hi

I keep getting this error like this

ERROR: Unable to instrument class [name of class X]

[details of classic NullPointerException trace]

ERROR: while transforming .. [name of class X]: null

But there is no problem of instrumentation in methods of X (No errors are generated for them). 

What should be the reason?

[Fabio Tudone]

Hi, can you share more information about the error, for example the full error message including class name/methods and the NPE stack trace?

-- Fabio

[Ahmet Özkök]

of course.

[quasar] ERROR: Unable to instrument class desmoj/core/simulator/Scheduler

java.lang.NullPointerException

at co.paralleluniverse.asm.Item.a(Unknown Source)

at co.paralleluniverse.asm.ClassWriter.c(Unknown Source)

at co.paralleluniverse.asm.ClassWriter.a(Unknown Source)

at co.paralleluniverse.asm.Frame.a(Unknown Source)

at co.paralleluniverse.asm.Frame.a(Unknown Source)

at co.paralleluniverse.asm.MethodWriter.visitMaxs(Unknown Source)

at co.paralleluniverse.asm.tree.MethodNode.accept(Unknown Source)

at co.paralleluniverse.asm.commons.JSRInlinerAdapter.visitEnd(Unknown Source)

at co.paralleluniverse.asm.MethodVisitor.visitEnd(Unknown Source)

at co.paralleluniverse.fibers.instrument.InstrumentClass$1.visitEnd(InstrumentClass.java:193)

at co.paralleluniverse.asm.ClassReader.b(Unknown Source)

at co.paralleluniverse.asm.ClassReader.accept(Unknown Source)

at co.paralleluniverse.asm.ClassReader.accept(Unknown Source)

at co.paralleluniverse.fibers.instrument.QuasarInstrumentor.instrumentClass(QuasarInstrumentor.java:120)

at co.paralleluniverse.fibers.instrument.QuasarInstrumentor.instrumentClass(QuasarInstrumentor.java:88)

at co.paralleluniverse.fibers.instrument.JavaAgent$Transformer.transform(JavaAgent.java:187)

at sun.instrument.TransformerManager.transform(Unknown Source)

at sun.instrument.InstrumentationImpl.transform(Unknown Source)

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(Unknown Source)

at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:188)

at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClassHoldingLock(ClasspathManager.java:626)

at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:601)

at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:562)

at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:486)

at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:459)

at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)

at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:400)

at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:476)

at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)

at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)

at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)

at java.lang.ClassLoader.loadClass(Unknown Source)

at desmoj.core.simulator.Experiment.createScheduler(Experiment.java:624)

at desmoj.core.simulator.Experiment.setupExperiment(Experiment.java:604)

at desmoj.core.simulator.Experiment.<init>(Experiment.java:392)

at desmoj.core.simulator.Experiment.<init>(Experiment.java:358)

at desmoj.core.simulator.Experiment.<init>(Experiment.java:319)

        ..

[quasar] ERROR: while transforming desmoj/core/simulator/Scheduler: null

java.lang.NullPointerException

at co.paralleluniverse.asm.Item.a(Unknown Source)

at co.paralleluniverse.asm.ClassWriter.c(Unknown Source)

at co.paralleluniverse.asm.ClassWriter.a(Unknown Source)

at co.paralleluniverse.asm.Frame.a(Unknown Source)

at co.paralleluniverse.asm.Frame.a(Unknown Source)

at co.paralleluniverse.asm.MethodWriter.visitMaxs(Unknown Source)

at co.paralleluniverse.asm.tree.MethodNode.accept(Unknown Source)

at co.paralleluniverse.asm.commons.JSRInlinerAdapter.visitEnd(Unknown Source)

at co.paralleluniverse.asm.MethodVisitor.visitEnd(Unknown Source)

at co.paralleluniverse.fibers.instrument.InstrumentClass$1.visitEnd(InstrumentClass.java:193)

at co.paralleluniverse.asm.ClassReader.b(Unknown Source)

at co.paralleluniverse.asm.ClassReader.accept(Unknown Source)

at co.paralleluniverse.asm.ClassReader.accept(Unknown Source)

at co.paralleluniverse.fibers.instrument.QuasarInstrumentor.instrumentClass(QuasarInstrumentor.java:120)

at co.paralleluniverse.fibers.instrument.QuasarInstrumentor.instrumentClass(QuasarInstrumentor.java:88)

at co.paralleluniverse.fibers.instrument.JavaAgent$Transformer.transform(JavaAgent.java:187)

at sun.instrument.TransformerManager.transform(Unknown Source)

at sun.instrument.InstrumentationImpl.transform(Unknown Source)

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(Unknown Source)

at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:188)

at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClassHoldingLock(ClasspathManager.java:626)

at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:601)

at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:562)

at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:486)

at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:459)

at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)

at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:400)

at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:476)

at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)

at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)

at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)

at java.lang.ClassLoader.loadClass(Unknown Source)

at desmoj.core.simulator.Experiment.createScheduler(Experiment.java:624)

at desmoj.core.simulator.Experiment.setupExperiment(Experiment.java:604)

at desmoj.core.simulator.Experiment.<init>(Experiment.java:392)

at desmoj.core.simulator.Experiment.<init>(Experiment.java:358)

at desmoj.core.simulator.Experiment.<init>(Experiment.java:319)

1 Haziran 2016 Çarşamba 17:03:19 UTC+3 tarihinde Fabio Tudone yazdı:

[Fabio Tudone]

I have seen this errors in the past because of peculiar classloading situations (or broken classpath). Are you running in an OSGI environment? Could you share a minimal project that reproduces the issue? Another possibly related issue: https://github.com/puniverse/quasar/issues/182

-- Fabio

[Ahmet Özkök]

Yes, I run a kind of OSGI environment, an Eclipse plugin application actually. 

I don't know what can I share, but the link you have shared looks similar. 

4 Haziran 2016 Cumartesi 06:37:26 UTC+3 tarihinde Fabio Tudone yazdı:

[Fabio Tudone]

Is that instrumentation error causing problems during execution?

Did that issue's discussion help in your case? If not a small GitHub project (or even just a gist with a build file and source file) that executes a program in an environment similar to yours and triggers this exception would help and if you manage to create it you could open a GitHub issue and point to it.

Thanks,

-- Fabio

[Carlos Eduardo Melo]

Just a follow up to this post in case anyone stumble upon it:

I had the same problem when using HazelCast. It uses an alternative ClassLoader in its de-serialization process. This classloader is, by default, null, and set only when the process of de-serialization occurr (the default being the thread context classloader). To circumvent this, you have to set up the classloader beforehand.