Error while instrumenting class files (asm.ClassWriter.getCommonSuperClass)

Question

Getting error on instrumentation

java.lang.RuntimeException: java.lang.ClassNotFoundException: Deposit
    at org.objectweb.asm.ClassWriter.getCommonSuperClass(Unknown Source)
    at org.objectweb.asm.ClassWriter.a(Unknown Source)
    at org.objectweb.asm.Frame.a(Unknown Source)
    at org.objectweb.asm.Frame.a(Unknown Source)
    at org.objectweb.asm.MethodWriter.visitMaxs(Unknown Source)
    at com.jConSequence.instrumentor.methodProber.AdddataBaseDetailsInstructions$AdddataBaseDetailsMethodInstructions.visitMaxs(AdddataBaseDetailsInstructions.java:131)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at com.jConSequence.instrumentor.PrintLoadedClasses.print(PrintLoadedClasses.java:31)
    at com.jConSequence.tooGUI.RevEnggToolGUI.jButton1ActionPerformed(RevEnggToolGUI.java:487)
    at com.jConSequence.tooGUI.RevEnggToolGUI.access$0(RevEnggToolGUI.java:471)
    at com.jConSequence.tooGUI.RevEnggToolGUI$1.actionPerformed(RevEnggToolGUI.java:127)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$000(Unknown Source)
    at java.awt.EventQueue$1.run(Unknown Source)
    at java.awt.EventQueue$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$2.run(Unknown Source)
    at java.awt.EventQueue$2.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

while instrumenting classes

D:\workspaces\workspace\bankManagement\bin\Account.class
D:\workspaces\workspace\bankManagement\bin\ATM.class
D:\workspaces\workspace\bankManagement\bin\ATMCaseStudy.class
D:\workspaces\workspace\bankManagement\bin\BalanceInquiry.class
D:\workspaces\workspace\bankManagement\bin\BankDatabase.class
D:\workspaces\workspace\bankManagement\bin\CashDispenser.class
D:\workspaces\workspace\bankManagement\bin\Deposit.class
D:\workspaces\workspace\bankManagement\bin\DepositSlot.class
D:\workspaces\workspace\bankManagement\bin\Keypad.class
D:\workspaces\workspace\bankManagement\bin\Screen.class
D:\workspaces\workspace\bankManagement\bin\Transaction.class

I am reading the above set of classes as byte streams using apache commonsIO.

Then using asm library instrumenting them.

Finally they are converted into class files.

It is at this point of instrumentation I am getting this error Can anybody kindly explain the reason and possible solution.

score 10 · Accepted Answer · answered Jul 23 '12 at 03:00

10

This error is occurring because ASM is generating stack map frames, and for some bytecodes, the stack map frames must contain the common superclass of two classes. By default, ASM implements this by loading classes via Class.forName and then implements the proper algorithm using reflection. Presumably, the ASM library is unable to load your Deposit class from its class loader.

To avoid the error, you'll need to either use SKIP_FRAMES (note: version 51.0 of class file used by Java 7 requires stack map frames, so this is a non-option if you're generating Java 7 bytecode), or you need to subclass ClassWriter and override getCommonSuperClass. Depending on what your code is doing, perhaps you can hard-code the answers using string comparisons, or perhaps you can take the ASM implementation and rewrite it to use a ClassLoader that you specify.

answered Jul 23 '12 at 03:00

Brett Kail

33,593
2
85
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I am trying to implement getCommonSuperClass, and to get the loaded classes, I am using instrumentation object, i.e instrumentObj.getAllLoadedClasses(). But what if some classes are not present here also ? – AKS Feb 29 '16 at 05:00
@AKS It's probably better to start a new question and reference this answer than to comment on such an old answer. That said, there is no magic here: you have to somehow get the answer. If you're trying to use getAllLoadedClasses but the class isn't loaded, you'll have to do something else to get an answer (e.g., use getResource to hopefully find the class bytes to find the answer). – Brett Kail Feb 29 '16 at 06:00
Ya, started a new question. Thanks! – AKS Feb 29 '16 at 06:01

score 1 · Answer 2 · answered May 18 '21 at 06:29

1

I also met this problem. After trying to write my own ClassWriter and searching on the internet, I finally found an implementation that works perfectly for me: SafeClassWriter.java

Hope it would help.

answered May 18 '21 at 06:29

Instein

2,484
1
9
14

Error while instrumenting class files (asm.ClassWriter.getCommonSuperClass)

2 Answers2

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