Post office web site - Note, that each test run creates a new
Note, that each test run creates a new console instance. In the Console View you can select which console to display by clicking the arrow button. Remote Debugging Remote debugging is used for applications that run on a remote JVM, especially for an application that runs outside the Eclipse platform. Typical targets for remote debugging are servlets that have neither a GUI nor a console. To make a Java application accessible to an external debugger, you must specify additional commandline parameters when starting the application s JVM. In the following example assuming that this application has already been installed outside Eclipse I demonstrate how DukeSpeaks can be made accessible to a remote debugger: java.exe -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=y, address=8787 -classpath %LOCALCLASSPATH% com.bdaum.dukeSpeaks.Player First, the JVM is switched into debug mode. The sun.tools.debug agent is switched off, as well as the JIT and HotSpot compilers. With Xrunjdwp the reference implementation of the Java Debug Wire Protocols (JDWP) is loaded. A socket connection is selected as transport mode. The server=y parameter specifies that the application acts as a debug server, and the suspend=y parameter specifies that the application must not start autonomously but must wait for a connection with the debug client. Finally, the address=8787 parameter specifies the debug port number that can be selected from the host computer s free ports. Now, start the application and execute the command. Nothing happens. The application waits for the debug client. Now it s time to create a remote debug configuration in Eclipse. To do so, invoke the Run > Debug function. In the selection list at the left-hand side of the dialog, select Remote Java Application and press the New button. Then enter a name for the new configuration (for example, DukeSpeaksRemote) and select the project (DukeSpeaks). This specification is actually not used to tell the Eclipse debugger the location of the binary files but to inform it about the location of the source files. The Connection Type field remains unchanged: Standard (Socket Attach). Since the remote application runs on the same host computer, you must enter the localhost value under Host. For Port, specify exactly the same value that was used above in the java command. So enter 8787. Finally, mark the Allow Termination of Remote VM checkbox. This allows you to terminate the application via remote control from the Eclipse debugger. Now the configuration is properly set up. You can start the debugging process by clicking the Debug button. From now on, everything works just as with local debugging. You can set breakpoints, look at variables, and even modify the values of variables. The only thing that does not work with remote debugging is, of course, HotSwapping. 119 Project Development
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