Use the multi-language debugger to take snapshots of the application state during execution.
Place breakpoints in your source code, add field watches, step through your code,
run into methods, and monitor execution as it occurs.
You can also connect the NetBeans debugger to an already-running process.
Expression Evaluation
Evaluate Java-syntax expressions assigned to watches and
conditional breakpoints "live" while stepping through your code.
You can even inspect partial results of expressions and step over individual expressions.
During a debugging session, you can evaluate any variable directly in the Source Editor
by moving the pointer over the variable:
The current value is displayed in a tool tip.
The evaluation is performed according to the context given by the current thread.
Expression Stepping
You can easily step over individual expressions within a statement.
The debugger will display the return value from each expression.
Configurable Breakpoints
In addition to the standard line and method breakpoints,
the NetBeans debugger provides advanced Class, Thread, Exception, and Variable breakpoints.
Configure these custom breakpoints to be triggered by conditions and events
such as uncaught exceptions, class loading, or variable access.
Multi-Session and Multi-Threaded Debugging
You can debug several processes at the same time:
Browse the list of the currently running debugging sessions
in the Sessions view of the Debugger window.
If you debug several threads,
check the state of your current session's threads
in the Threads view in the Debugger window.
Inspect the call stack and locale variables of the current thread
in the Call Stack and Local Variables views.
Change or suspend a thread if you think it is causing problems,
and resume the thread later, once the problem is solved.
HeapWalker
Use the HeapWalker to watch references to objects while debugging a program.
The Instances pane shows all instances of a type,
while the Fields pane shows its structure.
The References pane shows the references to the selected instance.
