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Debugging Using Eclipse

Debugging Using Eclipse. BusTRAK Team Software Engineering 3/23/2005. Debugging. The process of identifying and fixing errors in software Mainly used to describe run-time errors or incorrect results. Debugging Tips. Prefer compile-time errors to run-time errors

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Debugging Using Eclipse

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  1. Debugging Using Eclipse BusTRAK Team Software Engineering 3/23/2005

  2. Debugging • The process of identifying and fixing errors in software • Mainly used to describe run-time errors or incorrect results

  3. Debugging Tips • Prefer compile-time errors to run-time errors • Compiler can spot error quickly • GUI debuggers are much easier to use (Eclipse, Visual Studio) than command-line debuggers (gdb) • Fix one error at a time and document each change or use CVS

  4. Eclipse Debugging • Pretty buggy in 3.01 release • Clumsy interface • But better than using the command-line • Everything you need can be found in the Run menu

  5. Eclipse Debugging Features • Breakpoints • Step into • Step over • Step return • Step Filters • Watches • Run to line • Suspend/Resume/Terminate

  6. Breakpoints • Breakpoints cause the thread of execution to suspend and return to the debugger • Setting breakpoints in Eclipse is easy, just double-click the left margin

  7. Step Into • Executes single (highlighted) statement • If statement contains call to method, it steps into the method • To use: • Must be in Debug Perspective • Click from Debug Toolbar or press F5

  8. Step Over • Executes single (highlighted) statement • If statement contains method call, the entire method is executed without stepping through it • To use: • Must be in Debug Perspective • Click from Debug toolbar or press F6

  9. Step Return • All statements in current method are executed • Return to where method was called • To use: • Must be in Debug Perspective • Click from Debug toolbar or press F7

  10. Step with Filters • User can specify which methods Step Filter will execute and return from • Usually you would want steps to be made only into methods of your own classes • To set filters: • Go through Window > Preferences > Java > Debug > Step Filtering

  11. Watches • Watches allow you to view (and sometimes change) the value of a variable during execution • In Eclipse, watches are set automatically on variables in scope • Watches can be found in the Eclipse Debug perspective in the “Variables” window • Eclipse allows you to change the value of variables dynamically during runtime

  12. Run to Line • Equivalent to setting a temporary breakpoint

  13. Suspend/Resume/Terminate • Suspend pauses the current thread of execution and breaks into the debugger • Resume resumes a suspended application • Terminate stops the program and debugging process

  14. Demo

  15. Questions?

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