I have a Java API in jar file with some dependencies from other jar files.
Is there any way to call a specific method from this API, like using PInvoke from .NET?
Here you go :) I've used it myself and was very please with the implementation.
IKVM: Using Java API's in .NET Applications
(1) If you just want some libraries from Java.
(2.1) If you have access to the code.
(2.2) Last resort, dynamically load the Java into .Net (interpreter)