[jdt-debug-dev] Common Questions about functionality in jdt.debug.core

[Joe Tague <jtague@xxxxxxxxxxxxxxxx>]

Sorry to post here but I have had no luck in the newsgroups.

I am creating a plugin for my final year project that identifies design 
patterns from static structure and dynamic execution traces.

For this my plugin has been creating MethodEntryBreakpoints, and 
Watchpoints.

I create breakpoints by using the factories supplied by JDIDebugModel. 
For example:

IJavaMethodEntryBreakpoint br = JDIDebugModel.createMethodEntryBreakpoint(..

IJavaWatchpoint wp = JDIDebugModel.createWatchpoint(..

I am also able to launch in DEBUG_MODE.

I have a JavaBreakpointListener class that implements the 
breakpointHit() and installingBreakpoint() methods. In the former I just 
print some execution information out to the console (for now) and the 
latter I just return IJavaBreakpointListener.INSTALL;

In the breakpointHit() method I always return a 
IJavaBreakpointListener.DONT_SUSPEND vote so I can trace what and when 
methods are hit in the program execution, without suspending the VM.

For some reason LineBreakpoints and Watchpoints show as hitting the 
breakpointHit() method of my listener however MethodBreakpoints do not.

When I check the .isInstalled() property for my breakpoints, it shows 
them as not installed - which seems fine for everything but 
MethodBreakpoints.

At no point do I directly add breakpoints to a BreakpointManager, as 
from various posting it seemed that to make sure my breakpoint do not 
suspend the VM I should create them invisibly i.e do not register them 
with a BreakpointManager.

Can anyone suggest where I am going wrong?

Plus how do I gain access to objects of the type JavaValue, 
JavaVariable, JavaClassObject, JavaClassType etc. I need to do some 
decisions based on whether certain fields have been accessed, added to 
etc to identify the dynamic behaviour of a design pattern.

I know this is a lot to ask, and possibly the wrong place to ask it, but 
I cannot find any examples for these points anywhere. I have been 
backwards and forwards through the jdt.debug.* plugins.

Thanks for your time.

Joe