Not able to debug annotation processor

Until now, I never had to debug javac. Now that I am writing an annotation processor that gets called as part of javac, I felt the need to debug javac. I have still not found a way to do so. I tried passing the standard JVM debug options using -J option, but in vain. If you know how to attach a debugger to javac, please let me know.
Thanks,
Sahoo

Sahoo,
You can use the JSR-199 (IIRC) API to call the compiler programatically, which means you can call the compiler from a unit test, which means you just set a breakpoint in your processor, debug your test and the compiler runs and calls the processor and stops on the break point. Hickory has a package of testing tools. The core class there is Compilation which is a facade to the javax.tools API and an implementation of an in memory file manager. I have used this to have a processor load "files" via the class loader.getResource() mechanism so that should work for you as well.
See https://hickory.dev.java.net/nonav/apidocs/index.html?net/java/dev/hickory/testing/Compilation.html
If you browse the hickory source for the tests you'll find lots of examples.
https://hickory.dev.java.net/source/browse/hickory/trunk/code/test/net/java/dev/hickory/

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Please "Mark as Answer" if this post answered your question. :)
Kalpesh Chhatrala | Software Developer | Rajkot | India
Kalpesh 's Blog
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Hi Kalpesh,
>>Failed MyFunction The ASP.NET Web application at 'D:\MyProjectFolder' is already configured for testing by another test run. Only one test run at a
time can run tests in ASP.NET. If there are no other test runs using this Web application, ensure that the Web.config file does not contain an httpModule named HostAdapter.
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https://social.msdn.microsoft.com/Forums/en-US/e2ad0c20-df90-48dc-818c-8c5ec24d9365/visual-studio-test-is-not-hitting-breakpoints-in-debug?forum=vststest
Fang also shared more information about debugging the unit test for web project here:
https://social.msdn.microsoft.com/Forums/en-US/daa16086-b1b8-4917-ad8d-65e23b49e1bc/not-able-to-read-webconfig-through-unit-test-feature-by-visual-studiovsts?forum=vststest
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Not able to debug annotation processor

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