Jars included to the project

Hi everyone...
Today I've just started to work on a project that had several developers before me. Everytime a lib file (jar) used on the project was updated, they usually just copy/paste it and added the new jar to the class path. Now the classpath is a mess, with lots of files like "sourcelib1.0.jar" "sourcelib1.1.jar" "sourcelib1.2.jar" included...
I dont know how the Java compiler solves the conflicts of different jar files with the same class and methods, but with versions different, and I would like to know, to be able to clean this mess. (I've already tried to keep the lates version based on the number displayed, but I get build error if I do that). I dont really know if these several versions of the same lib added to the project are a problem I should worry about.
Also, Is there a way of knowing which lib version I'm using, since all of then are in the classpath?
Thanks for your answers

take a look at the jar lesson of the java tutorial here http://java.sun.com/docs/books/tutorial/deployment/jar/
you'll need:
1- an entry point of your program: Main-Class: mainClassName This entry must be added to the manifest file.
See http://java.sun.com/docs/books/tutorial/deployment/jar/appman.html
2- a classpath of your program: Class-Path: jar1-name jar2-name directory-name/jar3-nameThis entry must also be added to the manifest file.
See http://java.sun.com/docs/books/tutorial/deployment/jar/downman.html
NB: In order to manually package your program into a .jar file, you have to have the following structure:
-PROJECT_JAR_DIRECTORY/
- - -META-INF/MANIFEST.MF
- - -com/company/project/*.class
Open MS-DOS and go to the PROJECT_JAR_DIRECTORY directory then run this command:
jar cvfm MyJar.jar META-INF/MANIFEST.MF *hth

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