I was following an instruction to add some .jar files into classpath. After that I found I could not compile properly, then I realized that I added all the jar files but not in the order it specified. So I changed the order of the jar files (still the same jar files) and it compiled fine.
Does the sequence of jar files you add to classpath matter and why ?
This probably has something to do with classes that are in more than 1 JAR file. The system class loader checks the JAR files / folders on the class path in order of declaration. If one JAR has version A of a class and another JAR has version B of that same class, then you will use version A if the first JAR is first and version B if the second is first.