Re: Illegal signature

If this is the result of the same code you posted with subject 
"Statement v/s Line", the problem is very likely to be
new Type[] { Type.VOID }
you should replace that with Type.NO_ARGS

Nikhil C. Khedkar wrote:
> Hi,
> 	I have put few instructions in a method after each
> line. After I do that I am getting the following
> error. Note the ClassLOader has found one input
> parameter to the method, which was not there before
> and after the method was instrumented. Any clues?
> 
> Thanks,
> 	Nikhil Khedkar
> 
> instrumentMethod() : name = <init> signature = ()V
> EXITING instrumentMethod() : name = <init> signature =
> ()V
> 
> instrumentMethod() : name = calculate signature =
> (II)V
> EXITING instrumentMethod() : name = calculate
> signature = (II)V
> 
> instrumentMethod() : name = exposedAPI signature =
> ()Ljava/lang/String;
> EXITING instrumentMethod() : name = exposedAPI
> signature = ()Ljava/lang/String;
> 
> instrumentMethod() : name = simpleStatements signature
> = ()V
> EXITING instrumentMethod() : name = simpleStatements
> signature = ()V
> 
> instrumentMethod() : name = main signature =
> ([Ljava/lang/String;)V
> EXITING instrumentMethod() : name = main signature =
> ([Ljava/lang/String;)V
> 
> Exception in thread "main" java.lang.ClassFormatError:
> com/training/db/Addition
> 
> (Method "<init>" has illegal signature "(V)V")
>         at java.lang.ClassLoader.defineClass0(Native
> Method)
>         at
> java.lang.ClassLoader.defineClass(ClassLoader.java:502)
>         at
> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
>         at
> java.net.URLClassLoader.defineClass(URLClassLoader.java:250)
>         at
> java.net.URLClassLoader.access$100(URLClassLoader.java:54)
>         at
> java.net.URLClassLoader$1.run(URLClassLoader.java:193)
>         at
> java.security.AccessController.doPrivileged(Native
> Method)
>         at
> java.net.URLClassLoader.findClass(URLClassLoader.java:186)
>         at
> java.lang.ClassLoader.loadClass(ClassLoader.java:299)
>         at
> sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)
>         at
> java.lang.ClassLoader.loadClass(ClassLoader.java:255)
>         at
> java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
> 
> 
> Here's the code I want to instrument
> 
> package com.training.db;
> 
> import java.lang.StringBuffer;
> 
> public class Addition
> {
> 	private StringBuffer test = new StringBuffer("");
> 
> 	public Addition()
> 	{
> 		test = new StringBuffer("Test Message");
> 	}
> 
> 	public void calculate(int i, int j)
> 	{
> 		if(i == 0)
> 		{
> 			j = j + 5;
> 		}
> 		else
> 		{
> 			j = j + 5;
> 		}
> 	}
> 
> 	public String exposedAPI()
> 	{
> 		simpleStatements();
> 		int x = 9;
> 		int j = (x = 55);
> 
> 		String sName = null;int i = 0;
> 		return sName;
> 	}
> 
> 	private void simpleStatements()
> 	{
> 		int x = 12;
> 		int y = 10;
> 		System.out.println(x);
> 		int z = 1 + 6;
> 	}
> 
> 	public static void main(String []args) throws
> InterruptedException
> 	{
> 		System.out.println("main 1");
> 		Thread.sleep(10000);
> 
> 		System.out.println("main 2");
> 		Thread.sleep(10000);
> 	}
> }
> 
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