I want to verify binary compatibility between 2 JARs.
Following the suggestions in this answer I used jboss tattletale but it can find only missing classes.
How can I find if there are missing methods? Is it possible at all?
E.g.
"Depends - on" class Foo depends on Bar (like many other middle class workers)
import org.overlyusedclassnames.Bar
public class Foo{
public void someMethod(){
Bar tender = new Bar();
tender.getJohnnyRedLabel();
tender.getJohnnyBlueLabel(); //this method is new in the Bar class
}
}
"Compile time" class
package org.overlyusedclassnames;
/**
* @Since 1992
* Changes: added blue and gold Johnny Walker labels
*/
public class Bar {
public Drink getJohnnyRedLabel(){
return new JohnyWalkerFactory.get(RedLabel.class);
}
public Drink getJohnnyBlackLabel(){
return new JohnyWalkerFactory.get(BlackLabel.class);
}
public Drink getJohnnyGoldLabel(){
return new JohnyWalkerFactory.get(GoldLabel.class);
}
public Drink getJohnnyBlueLabel(){
return new JohnyWalkerFactory.get(BlueLabel.class);
}
}
Now imagine an old Bar jar is accedently replacing the compiled time bar:
"Runtime time" class
package org.overlyusedclassnames;
/**
* @Since 1909
* Changes: added red and black Johnny Walker labels
*/
public class Bar {
public Drink getJohnnyRedLabel(){
return new JohnyWalkerFactory.get(RedLabel.class);
}
public Drink getJohnnyBlackLabel(){
return new JohnyWalkerFactory.get(BlackLabel.class);
}
}
Is there a way to identify the missing method without running it and getting a NoSuchMethodError?
Disclaimer: This is a major rephrasing of my own related question, which is undeletable. I chose asking a new question because the rephrasing will render the current 2 answers as quite unrelated to the topic.
