For software development, we can distinguish two different kinds of errors:
Compile errors appear during compile and are thrown by the Java compiler. A typical example for this type of error is an improperly typed method or class name . This type of error can be found very easily because the compiler checks the code and presents a meaningful message.
There are also runtime errors, which cannot be found by the compiler; thus they appear only during runtime. An example might be a loop stepping through an array with a size smaller than the loop variable. These kinds of errors are typically fixed using a debugger.
This chapter describes how to fix both types of errors using the validator and debugger tooling in WebSphere Studio.