Книга: Learning GNU Emacs, 3rd Edition

9.5.7 Compiling and Running with the JDEE

9.5.7 Compiling and Running with the JDEE

Compiling the current buffer can be done quickly with the C-c C-v C-c command. Any errors show up in the compilation buffer. That compilation buffer also allows you to navigate quickly to any errors that the compiler finds. Simply move your cursor to the error in question (using the normal motion commands) and hit Enter. You'll find yourself in the right file on the right line number. Very handy indeed.

Note that you can also run ant builds with M-x jde-ant-build. Check out the JDEE documentation or the help for various jde-ant variables for more information.

Running a simple program that has its own main( ) method is easy: just press C-c C-v C-r. That command executes the current buffer (by opening an execution buffer named *fully.qualified.ClassName*). Any output from the program shows in the buffer. You can move around in the buffer just as you would in a normal text buffer.

Of course, if you are working on anything other than a simple test class, you'll probably be in a package. Java's use of the classpaths rarely leaves room for being at the "bottom" of a package hierarchy. For example, in the package com.oreilly.demo, you want to start execution from the same directory that contains the com directory, not from the demo directory that contains the actual Java files. Regrettably, the demo directory is the default.

You can edit the following variables to make executing in larger projects a bit more convenient:

jde-run-working-directory

The directory in which execution starts

jde-run-application-class

The fully qualified name of the class that contains the main( ) method to execute

With those values set, you should be able to run your application from any buffer, regardless of what directory the file you're editing happens to be in.

Another fun note about running your application through the JDEE: if any stack traces appear because of exceptions, you can navigate those traces by using the C-c C-v C-[ and C-c C-v C-] commands (up and down, respectively). Again, Emacs makes it possible to manage quite a large portion of a development project all from one interface.

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