java bytecode manipulate; insert Print code after every java code

Question

I want to insert Print code after every java code. For example:

public void  myMethod() {
   Integer i = 0;
   Long l = 0L;
   Date date = new Date();
}

to:

public void  myMethod() {
   Integer i = 0;
   System.out.println("test");
   Long l = 0L;
   System.out.println("test");
   Date date = new Date();
   System.out.println("test");
}

how should I do?Can you help me?

@MarounMaroun nope. He want to insert that through byte code. — Suresh Atta
– Suresh Atta, Commented Dec 18, 2015 at 8:16
@sᴜʀᴇsʜᴀᴛᴛᴀ I don't really understand what's the meaning of inserting print statement to the bytecode :/ — Maroun
– Maroun, Commented Dec 18, 2015 at 8:17

Community · Accepted Answer · 2017-05-23 11:52:02Z

1

One way to a solution in the compiler

1 parse your code:

Best way to parse Java in Java

2 insert automatically code:

use JET for example

https://eclipse.org/articles/Article-JET2/jet_tutorial2.html

SECOND SOLUTION

create and put some annotation (by hand)

RUNTIME SOLUTION

you have to investigate bytecode.

Some links: http://web.cs.ucla.edu/~msb/cs239-tutorial/

see the chapter: Generating Call Traces

And posts around this tag: https://stackoverflow.com/questions/tagged/java-bytecode-asm

edited May 23, 2017 at 11:52

CommunityBot

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answered Dec 18, 2015 at 8:22

guillaume girod-vitouchkina

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2 Comments

Gan Zhang Over a year ago

At first,thank you for your answer.And I have a question,what do you think of using a bytecode library like ASM to do this?Can it work?

guillaume girod-vitouchkina Over a year ago

@GanZhang , Yes, it could, I put some links: see the link on UCLA.

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