Dynamic Query-Based Debugger
Many program errors are hard to find because of a cause-effect gap between the time when the error occurs and the time when it becomes apparent to the programmer by terminating the program or by producing incorrect results   . The situation is further complicated in modern object- oriented systems which use large class libraries and create complicated pointer-linked data structures. If one of these references is incorrect and violates an abstract relationship between objects, the resulting error may remain undiscovered until much later in the program’s execution.
KeywordsVirtual Machine Query Result Garbage Collection Query Evaluation Java Virtual Machine
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