[jboss-jira] [JBoss JIRA] (JASSIST-241) VerifyError: Expecting a stackmap frame - Switch case statement Java 7

[Patson Luk (JIRA)]

Patson Luk created JASSIST-241:
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             Summary: VerifyError: Expecting a stackmap frame - Switch case statement Java 7
                 Key: JASSIST-241
                 URL: https://issues.jboss.org/browse/JASSIST-241
             Project: Javassist
          Issue Type: Feature Request
    Affects Versions: 3.19.0-GA
         Environment: jdk7
            Reporter: Patson Luk
            Assignee: Shigeru Chiba


This could be a duplicate of issue 215 and 205. 

Tested it on the master (3.19.0-GA) with java 7. Running the below class

{code}
import java.util.Random;

import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtMethod;


public class TestDriver {

    public static void main(String[] args) throws Exception {
        ClassPool pool  = ClassPool.getDefault();
        CtClass cc = pool.get("TestClass");
        
        CtMethod testMethod = cc.getMethod("test", "(Ljava/lang/Object;)V");
        testMethod.insertAfter("System.out.println(\"inserted!\");");
        cc.toClass();

        //invoke it
        TestClass.test(new Object());
    }
}

class TestClass {
    public static void test(Object o) {
        //part 1
        if (o == null) {
            return;
        }

        //part 2
        int oper = new Random().nextInt();
        switch (oper) {
        case 1:
            break;
        }
    }
}

{code}
 
Triggers error message as below:
{quote}
Exception in thread "main" java.lang.VerifyError: Expecting a stackmap frame at branch target 9 in method TestClass.test(Ljava/lang/Object;)V at offset 1
	at TestDriver.main(TestDriver.java:19)
{quote}

*Please take note that:*
# This is observed on Java 7. When the same code is run on Java 6, it is fine
# Both the "part 1" - return statement (commented in the code above) and "part 2" - switch/case statement have to be there to trigger the error. If either of those are commented out, then the code runs fine




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