ClassFile.compact mangles large class files ------------------------------------------- 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 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.jboss.org/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira