Read return value of method using javassist

Question

I want to read the return value of a method and I have to pass it to the code that I insert using the .insertAfter method.

Example:

public String sayHello(){
    return "1";
}

I want to add some code, say someClass.someMethod () using javassist.

method.insertAfter("someClass.someMethod(<how to add that value here>);");

Can anyone let me know how to do this?

[Edit] I cannot edit the body of the method because other code may be present. The above method is just an example.

+3

Santosh Tulasiram Apr 20 15 at 18:40

1 answer

James · Accepted Answer · 2015-05-20T16:59:13+0000

This works for me:

    method.insertAfter( "System.err.println( $_ );");

If the method returns void, then $ _ will be null. So, in your case, I think this will work:

    method.insertAfter( "someClass.someMethod( $_ );");

where someMethod takes an object.