[jboss-jira] [JBoss JIRA] Created: (JASSIST-43) ConstPool.getItem(int) returns unexpected item, causes exceptions in calling methods; e.g. in getFieldrefClassName(...) and getInterfaceMethodrefClassName(...)

[Martin Burger (JIRA)]

ConstPool.getItem(int) returns unexpected item, causes exceptions in calling methods; e.g. in getFieldrefClassName(...) and getInterfaceMethodrefClassName(...)
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                 Key: JASSIST-43
                 URL: http://jira.jboss.com/jira/browse/JASSIST-43
             Project: Javassist
          Issue Type: Bug
         Environment: $ uname -a
Darwin [...] 8.11.1 Darwin Kernel Version 8.11.1: Wed Oct 10 18:23:28 PDT 2007; root:xnu-792.25.20~1/RELEASE_I386 i386 i386

$ java -version
java version "1.5.0_13"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_13-b05-241)
Java HotSpot(TM) Client VM (build 1.5.0_13-121, mixed mode, sharing)

Javassist 3.6.0
            Reporter: Martin Burger
         Assigned To: Shigeru Chiba


I am using subclasses of javassist.expr.ExprEditor to heavily instrument classes. On some large (in terms of amount of code) classes I get various exceptions in ConstPool, for example:

Caused by: java.lang.ClassCastException: javassist.bytecode.ClassInfo
        at javassist.bytecode.ConstPool.getFieldrefClassName(ConstPool.java:254)
        at javassist.expr.FieldAccess.getClassName(FieldAccess.java:97)
        at javassist.expr.FieldAccess.getCtClass(FieldAccess.java:89)
        at javassist.expr.FieldAccess.getField(FieldAccess.java:112)

And:

Caused by: java.lang.NullPointerException
        at javassist.bytecode.ConstPool.getInterfaceMethodrefClassName(ConstPool.java:413)
        at javassist.expr.MethodCall.getClassName(MethodCall.java:91)
        at javassist.expr.MethodCall.getCtClass(MethodCall.java:75)
        at javassist.expr.MethodCall.getMethod(MethodCall.java:114)

It seems that ConstPool.getItem(int) returns an "unexpected" item, so (1) the cast to FieldrefInfo fails and (2) the returned item is null instead of an instance of InterfaceMethodrefInfo, respectively.

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