How to remove the attached source which was added to a Jar?

Are commons-lang-2.4.jar and commons-lang3-3.1.jar required when passing and object array to an action using struts2.3.16.1?

• I used these jars to pass obejct array to an action ezmorph json-lib commons-collections commons-logging ... commons-lang-2.4.jar I thought I could remove commons-lang3.3.1.jar but when I did it, the web project couldn't start. I added commons-lang3.3.1.jar again, and it worked. I just want to know why or whether I did something wrong.

• Answer:

  Larger frameworks such as Struts come with a lot of dependencies. It is best to use a dependency manager to sort these out so that they automatically choose the correct jar versions. Example: .