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

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 Fix For: 3.12.0.GA Attachments: after, before, CodeIterator.r506.patch, 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.