Eclipse Debugging

Keynotes for a quick recap.

Debug Shell

Use this area to Write, Run and inspect Java expressions in the context of a debug session. Write a piece of code in debug shell (Window->Show View->Debug Shell
Select the written code-> Execute Selected Text will be enabled to execute it.
Also, a display of the result will be enabled to check the result. The result will be displayed in the console window(Auto switches from debug shell to Console)

Detail Formatter

This is used to view the objects while inspecting with explicit values and not object references.
In the example for DebugPersonDetailsIteration.java
Right-click on the person in expressions->New Detail Formatter

String description = "Name:"+this.name+";Age:"+ this.age + " ;Country:" + this.country;
return description;

Conditional BreakPoint

In the debug mode, when the breakpoint is hit for the first time
Right-click on the breakpoint->Breakpoint Properties--> Checkbox (Conditional BreakPoint) and add below condition

if(p.getName()!=null && p.getName().equalsIgnoreCase("Marco")) {
	return true;
}else {
	return false;
}

Hit Count

In the debug mode, when the breakpoint is hit for the first time, Right-click on the breakpoint->Breakpoint Properties--> checkbox (HitCount)-->Enter a number.
The breakpoint will be hit when the iteration count matches the given number

Exception Breakpoint

In the debug mode, breakpoints tab click on
Add Java Exception breakpoint -> Choose an Exception (Arithmetic Exception) -> Click OK
The code will pause right at the line about to through the exception.
Note: Right Click -> Breakpoint properties ->Select "SubClasses of this exception"

Method Breakpoint

Right-click on the breakpoint placed at the method signature -> Breakpoint properties->Select Entry or Exit check boxes based on where you want your code to pause.

Drop To Frame

This allows you to drop to a previous frame in the call stack seen in debug pane. It is like reverting to an earlier stack by stopping the program and re-running it.

Step Filtering

This is used to avoid stepping into the standard libraries.
Windows->Preferences->Debug->StepFiltering->Checkbox (Use Step Filters)

Select enclosing element

ALT+SHIFT+UP/DOWN

References

https://github.com/j2eeexpert2015/DebuggingTutorial https://eclipsetutorial.sourceforge.net/debugger.html https://www.youtube.com/playlist?list=PLUGinutrSzN-ALgaL0mSyPDHi3VhUCcuV