Override class in java

Question

Assume I have a project K

K depends lib.jar

In lib.jar , there is a class named x.y.z.Foo

Answer 1

Java class loading behaviour in a standalone application (at least with no custom classloaders) is stable. Make sure that your k.jar (or path) comes before lib.jar in -cp java arg

java -cp k.jar lib.jar ...

or add dependencies to /META-INF/MANIFEST.MF of your K project as

...
Class-Path: lib1.jar lib2.jar
...

and run

java -jar k.jar

k.jar classes will be loaded first

in Maven it is

    
        
            maven-jar-plugin
            
                
                    
                        true
                    
                
            
        
         ...