[jboss-jira] [JBoss JIRA] (JASSIST-146) ClassFile.compact mangles large class files

[Paul Rupe (Created) (JIRA)]

ClassFile.compact mangles large class files
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                 Key: JASSIST-146
                 URL: https://issues.jboss.org/browse/JASSIST-146
             Project: Javassist
          Issue Type: Bug
    Affects Versions: 3.15.0-GA
         Environment: Fedora Linux 14 x86_64, Java 1.6.0_27
            Reporter: Paul Rupe
            Assignee: Shigeru Chiba


I have a large .class file (1307829 bytes).  Simply reading it in using javassist, calling ClassFile.compact(), then writing it out to a new file creates an invalid class file that is substantially larger (1996560 bytes).

javap -c throws an EOFException:
java.io.EOFException
        at java.io.DataInputStream.readFully(DataInputStream.java:197)
        at java.io.DataInputStream.readFully(DataInputStream.java:169)
        at sun.tools.javap.AttrData.read(AttrData.java:54)
        at sun.tools.javap.FieldData.read(FieldData.java:91)
        at sun.tools.javap.ClassData.readFields(ClassData.java:211)
        at sun.tools.javap.ClassData.read(ClassData.java:114)
        at sun.tools.javap.ClassData.<init>(ClassData.java:70)
        at sun.tools.javap.JavapPrinter.<init>(JavapPrinter.java:48)
        at sun.tools.javap.Main.displayResults(Main.java:208)
        at sun.tools.javap.Main.perform(Main.java:79)
        at sun.tools.javap.Main.entry(Main.java:67)
        at sun.tools.javap.Main.main(Main.java:52)

javassist throws an exception trying to read back the class file it just created:
java.lang.ClassCastException: javassist.bytecode.FieldrefInfo cannot be cast to javassist.bytecode.Utf8Info
        at javassist.bytecode.ConstPool.getUtf8Info(ConstPool.java:615)
        at javassist.bytecode.AttributeInfo.read(AttributeInfo.java:76)
        at javassist.bytecode.FieldInfo.read(FieldInfo.java:253)
        at javassist.bytecode.FieldInfo.<init>(FieldInfo.java:63)
        at javassist.bytecode.ClassFile.read(ClassFile.java:783)
        at javassist.bytecode.ClassFile.<init>(ClassFile.java:109)
        at Test.compact(Test.java:21)
        at Test.main(Test.java:12)

Attempting to use the new class file in an application results in
java.lang.ClassFormatError: Invalid this class index 537 in constant pool in class file WorldGenCreateGuild


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