Figure 2

JobCenter leverages Java class loaders to separately load modules with their own namespaces to avoid library, package, class, or interface collisions with the main JobCenter classes or other modules. When executed, JobCenter loads a minimal set of root classes and a single external library that are primarily responsible for loading the main classes using a new class loader. These main classes contain the majority of code and libraries necessary for running JobCenter and are responsible for loading modules using a new class loader for each module. Typically, classes loaded in this manner would share namespace with their parent class loader (main), but the parent class loader for modules is explicitly set to be the root class loader. This separates module namespaces from each other, as well as from the large set of main classes and libraries that run JobCenter.