I recently conducted an eSeminar on building enterprise applications with Flex Builder and Flex Data Services. You can view the recording of that presentation at: http://seminars.breezecentral.com/p24622178/ In my session I promised that I would formally document the process for debugging Flex & Java together in Flex Builder. So finally, here is that documentation. If you haven't already done so, the first thing you will need to do is install Flex Builder 2 as an Eclipse Plugin and Flex Data Services with integrated JRun. You can get these products on the Adobe website. I use FDS with JRun for this example, but you could easily use Tomcat or any other app server. A few steps may change slightly, but the general concepts would be the same. Now just follow along. 1) Start Flex Builder & Flex Data Services 2) Create a new Flex Project in Flex Builder ![][1] 2.1) Specify that the application will use Flex Data Services and that the application should be compiled on the server ![][2] 2.2) Click Next 2.3) Locate the root folder of your FDS samples application; mine is E:\fds2\jrun4\servers\default\samples 2.4) Change the root URL to be the URL to the samples application; mine is http://localhost:8700/samples/ ![][3] 2.5) Click Next 2.4) Lets name the project crm 2.5) Uncheck the "Use default location" box 2.6) Specify the Folder as \dataservice\crm for instance mine is: E:\fds2\jrun4\servers\default\samples\dataservice\crm 2.7) Specify the Main application file as mini.mxml ![][4] 2.8) Select Finish 3) Test everything by right-clicking on the mini.mxml file in the Eclipse Navigator, then Run As -> Flex Application ![][5] 3.1) Your browser should load the mini application and look like: ![][6] 4) Now back to Flex Builder where we will create another new project, but this time a Java Project 4.1) Name the project samples_server 4.2) Create the project from existing source, specifying the WEB-INF folder of the samples application, in my case: E:\fds2\jrun4\servers\default\samples\WEB-INF ![][7] 4.3) Select Next 4.4) Go to the Libraries tab and select "Add External JARs" ![][8] 4.5) Select the jrun.jar file located in \jrun4\lib ![][9] 4.6) Also add the flex-services.jar located in \jrun4\servers\lib ![][10] 4.7) Select Finish 5) Setup Java Debugging 5.1) Shutdown Flex Data Services 5.2) In the Eclipse Navigator browse to the src/samples.crm/EmployeeDAO.java class 5.3) Right-click on the EmployeeDAO.java file and select Debug As -> Debug... ![][11] 5.4) Select Java_Application then New 5.5) Specify the name as "JRun_Debug" 5.6) Check the box "Include libraries when searching for a main class" 5.7) Enter the Main class: jrunx.kernel.JRun ![][12] 5.8) Select the Arguments tab and enter "-start default" for the program arguments and "-Xms32m -Xmx384m -Dsun.io.useCanonCaches=false" for the VM arguments 5.9) Select the Apply button 5.10) Select the Debug button 5.11) Insure that Flex Data Services started ![][13] 6) Set a breakpoint in EmployeeDAO.java in the findEmployeesByCompany method ![][14] 7) Set a breakpoint in mini.mxml in the fill function ![][15] 8) Right-click on mini.mxml in the Eclipse Navigator and select Debug As -> Flex Application ![][16] 9) You should hit the breakpoint in the mini Flex application, then select Resume in the debugger ![][17] 10) You should hit the breakpoint in the Java backend ![][18] 11) Now jump up and down with joy saying "I can actually debug web applications!" I hope this is helpful for you. It's sure helped me figure out just where things in my applications were going wrong. -James [1]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/1a.png [2]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/2a.png [3]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/2-5a.png [4]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/3a.png [5]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/4a.png [6]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/5a.png [7]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/6a.png [8]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/7a.png [9]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/8a.png [10]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/9a.png [11]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/10a.png [12]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/11a.png [13]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/12a.png [14]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/13a.png [15]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/14a.png [16]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/15a.png [17]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/16a.png [18]: http://www.cayambe.com/wordpress/wp-content/uploads/2006/06/17a.png