Provides interfaces for interacting with IDEA's debugger. The main extensibility point of the debugger is the possibility for a plugin to provide custom mapping of positions in compiled classes to source code lines, which is mostly necessary for JSP debugging. Such mapping is provided through the {@link PositionManager} interface. One standard implementation of this interface for application servers compatible with the JSR-45 specification is provided by the {@link JSR45PositionManager} class. Another implementation of this interface, which can be used as an example for the debugger API, is found in the Tomcat plugin.