[jboss-jira] [JBoss JIRA] (JASSIST-149) ClassFormatError when using an ExprEditor, replacing a MethodCall after replacing a FieldAccess with a throw-Statement

[Ben Romberg (JIRA)]

Ben Romberg created JASSIST-149:
-----------------------------------

             Summary: ClassFormatError when using an ExprEditor, replacing a MethodCall after replacing a FieldAccess with a throw-Statement
                 Key: JASSIST-149
                 URL: https://issues.jboss.org/browse/JASSIST-149
             Project: Javassist
          Issue Type: Bug
    Affects Versions: 3.15.0-GA
         Environment: JRE 1.6
            Reporter: Ben Romberg
            Assignee: Shigeru Chiba


To reproduce, use the following ExprEditor:

new ExprEditor() {
  edit(FieldAccess fieldAccess) {
    fieldAccess.replace("throw new ...");
  }

  edit(MethodCall methodCall) {
    methodCall.replace(...);
  }
}

Now, use the ExprEditor on a method assigning a field first and then calling a method. When loading the modified class, the following exception should occur:

java.lang.ClassFormatError: Invalid pc in LineNumberTable in class file de/andrena/next/systemtest/pure/PureOnlyForOwnMethodsFieldsAndParametersSystemTest$TargetClass
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
	at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
	at java.lang.Class.getDeclaredFields0(Native Method)
	at java.lang.Class.privateGetDeclaredFields(Class.java:2291)
	at java.lang.Class.getDeclaredFields(Class.java:1743)
...

Expected behavior:
* Either correctly replacing the methodCall without corrupting the line-number-table, or
* throwing a CannotCompileException when trying to modify/insert code after a throw-Expression.

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