1. A system, comprising: a processor; and a memory comprising program instructions, wherein the program instructions are executable by the processor to implement a class loader mechanism comprising a hierarchy of class loaders, wherein the hierarchy of class loaders comprises a delegator class loader and a parent class loader of the delegator class loader, wherein the delegator class loader is configured to: receive a load class request from one of one or more child class loaders of the delegator class loader in the hierarchy of class loaders; and delegate the load class request to a module class loader in a class loader chain comprising one or more module class loaders, wherein the parent of each of the one or more module class loaders in the class loader chain is set to the parent class loader of the delegator class loader; wherein the module class loader in the class loader chain is configured to load a class indicated by the load class request.