[jboss-jira] [JBoss JIRA] Updated: (JASSIST-99) Javassist causes java.lang.ClassFormatError: Invalid length 561 in LocalVariableTable in class file

[Martin Burger (JIRA)]

     [ https://jira.jboss.org/jira/browse/JASSIST-99?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martin Burger updated JASSIST-99:
---------------------------------

    Attachment: JASSIST-99.zip


The attached archive JASSIST-99.zip contains both the working and the corrupt class flle.

> Javassist causes java.lang.ClassFormatError: Invalid length 561 in LocalVariableTable in class file
> ---------------------------------------------------------------------------------------------------
>
>                 Key: JASSIST-99
>                 URL: https://jira.jboss.org/jira/browse/JASSIST-99
>             Project: Javassist
>          Issue Type: Bug
>    Affects Versions: 3.11.0.GA
>            Reporter: Martin Burger
>            Assignee: Shigeru Chiba
>         Attachments: JASSIST-99.zip
>
>
> I am instrumenting field accesses in Java classes. Unfortunately, this fails in some cases, the manipulated byte code causes a java.lang.ClassFormatError:
> Exception in thread "main" java.lang.ClassFormatError: Invalid length 561 in LocalVariableTable in class file de/unisb/cs/st/deltadebugging/jinsi/test/integration/events/outgoing/fieldaccesses/SuperClassOfObserved
>         at java.lang.ClassLoader.defineClass1(Native Method)
>         ...
> This issue occurred in 3.11.0.GA and is not fixed in r505. Maybe this is related to JASSIST-98. In 3.10.0.GA, this issue does not exist, the affected class can be loaded without any error.
> I tried to analyze the corrupt class file with javassist.tools.framedump, but the analysis fails:
> Exception in thread "main" java.lang.RuntimeException: javassist.bytecode.BadBytecode: Could not find class in descriptor [pos = 8]: de.unisb.cs.st.deltadebugging.jinsi.test.integration.events.outgoing.fieldaccesses.Unobserved
>         at javassist.bytecode.analysis.FramePrinter.print(FramePrinter.java:89)
>         ...
> I decompiled both classes (the working one and the corrupt one) using JAD, the output differs slightly:
> 43c43
> < /*  16*/        JVM INSTR new #96  <Class Long>;
> ---
> > /*  16*/        JVM INSTR new #102 <Class Long>;
> 59c59
> < /*  16*/        JVM INSTR new #96  <Class Long>;
> ---
> > /*  16*/        JVM INSTR new #102 <Class Long>;
> Here is the corrupt decompiled code of line 16. Compared to the working class, lines 43 and 59 seem to be switched:
>     28	/*  16*/        obj = this;
>     29	/*  16*/        Unobserved unobserved1 = null;
>     30	/*  16*/        unobserved1 = ((SuperClassOfObserved) (obj)).unobserved;
>     31	/*  16*/        EventRecorderFactory.getInstance().recordOutgoingFieldRead(this, JinsiClassUtils.getClassOfObject(this), obj, Desc.getClazz("de.unisb.cs.st.deltadebugging.jinsi.test.integration.events.outgoing.fieldaccesses.SuperClassOfObserved"), "unobserved", unobserved1, Desc.getType("Lde/unisb/cs/st/deltadebugging/jinsi/test/integration/events/outgoing/fieldaccesses/Unobserved;"), "SuperClassOfObserved.java", 16, Context.METHOD);
>     32	/*  16*/        EventRecorderFactory.getInstance().recordIncomingFieldRead(this, JinsiClassUtils.getClassOfObject(this), obj, Desc.getClazz("de.unisb.cs.st.deltadebugging.jinsi.test.integration.events.outgoing.fieldaccesses.SuperClassOfObserved"), "unobserved", unobserved1, Desc.getType("Lde/unisb/cs/st/deltadebugging/jinsi/test/integration/events/outgoing/fieldaccesses/Unobserved;"), "SuperClassOfObserved.java", 16, Context.METHOD);
>     33	/*  16*/        obj = unobserved1;
>     34	/*  16*/        l = 0L;
>     35	/*  16*/        l = ((Unobserved) (obj)).fieldLong;
>     36	/*  16*/        EventRecorderFactory.getInstance();
>     37	/*  16*/        this;
>     38	/*  16*/        JinsiClassUtils.getClassOfObject(this);
>     39	/*  16*/        obj;
>     40	/*  16*/        Desc.getClazz("de.unisb.cs.st.deltadebugging.jinsi.test.integration.events.outgoing.fieldaccesses.Unobserved");
>     41	/*  16*/        "fieldLong";
>     42	/*  16*/        l;
>     43	/*  16*/        JVM INSTR new #102 <Class Long>;
>     44	/*  16*/        JVM INSTR dup ;
>     45	/*  16*/        Long();
>     46	/*  16*/        Desc.getType("J");
>     47	/*  16*/        "SuperClassOfObserved.java";
>     48	/*  16*/        16;
>     49	/*  16*/        Context.METHOD;
>     50	/*  16*/        recordOutgoingFieldRead();
>     51	/*  16*/        JVM INSTR pop ;
>     52	/*  16*/        EventRecorderFactory.getInstance();
>     53	/*  16*/        this;
>     54	/*  16*/        JinsiClassUtils.getClassOfObject(this);
>     55	/*  16*/        obj;
>     56	/*  16*/        Desc.getClazz("de.unisb.cs.st.deltadebugging.jinsi.test.integration.events.outgoing.fieldaccesses.Unobserved");
>     57	/*  16*/        "fieldLong";
>     58	/*  16*/        l;
>     59	/*  16*/        JVM INSTR new #102 <Class Long>;
>     60	/*  16*/        JVM INSTR dup ;
>     61	/*  16*/        Long();
>     62	/*  16*/        Desc.getType("J");
>     63	/*  16*/        "SuperClassOfObserved.java";
>     64	/*  16*/        16;
>     65	/*  16*/        Context.METHOD;
>     66	/*  16*/        recordIncomingFieldRead();
>     67	/*  16*/        JVM INSTR pop ;
>     68	/*  16*/        long fieldLong = l;
> However, I don't know if this is related to the defect.

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