How to debug a DLL called from Java in Delphi?

Question

With Delphi I wrote a DLL which can be called from Java via JNA (Java Native Access) . Methods in this DLL are just simple operations, but for future use and more complex invocations I would like to know how I can use the Delphi debugger, if the DLL is called from Java directly (or from the Java IDE).

Answer 1

I believe the answer for this question would be the same as for Stack Overflow question How to debug a DLL file in Delphi .

In fact, since you debug the Delphi's DLL file within a Delphi environment, it does not matter who is in the higher of the call stack.

Answer 2

It works if I define the host application (Java) and set the correct arguments:

• Host Application: C:\\Programme\\Java\\jdk1.6.0_14\\jre\\bin\\java.exe
• Parameter: -cp "/path/to/test.jar" junit.textui.TestRunner AppTest

The JUnit text TestRunner command line arguments are explained here: http://junit.sourceforge.net/junit3.8.1/javadoc/junit/textui/TestRunner.html

Answer 3

Why not debug the DLL in Delphi first? There's a unit testing framework for Delphi called DUnit . You'll still want to write integration tests for the full system, but you could mock out the external dependency in your JUnit unit tests.