On 29/04/2012 22:08, dgchristen...@comcast.net wrote: > Thanks for the response Mark. I've done as you've suggested and moved the env > vars to setenv.sh and explicitly set JAVA_HOME. Setting JAVA_HOME means I no > longer need to change the -Djava.library.path but I still get the same error > (X11 not found). > > I definitely have an X11 server running on the server (which is really my > laptop; I'm running all of this locally on my laptop--no remoting). Is it > possible that the problem occurs because I am running Tomcat as a daemon? The > command I use to start Tomcat is: > > sudo service tomcat6 start > > I've tried running startup.sh directly from the console but it doesn't work. > It looks like /etc/init.d/tomcat6 sets up some env vars before starting > Tomcat. I can try updating my environment so I can run startup.sh if you > think it worth attempting.
Please don't top-post. Answer inline instead. Tomcat has no knowledge of Swing, so or UI components of this nature. Is there a reason it has to be started from Tomcat? p > Thanks, > DG > > ----- Original Message ----- > From: "Mark Eggers" <its_toas...@yahoo.com> > To: "Tomcat Users List" <users@tomcat.apache.org> > Sent: Saturday, April 28, 2012 6:50:07 PM > Subject: Re: Running Swing app under Tomcat 6 on Linux > > Comments and questions are in line. Please note I run Fedora / CentOS / > Redhat and I'm not so familiar with Ubuntu. > > ----- Original Message ----- > >> From: "dgchristen...@comcast.net" <dgchristen...@comcast.net> >> To: users@tomcat.apache.org >> Cc: >> Sent: Saturday, April 28, 2012 1:11 PM >> Subject: Running Swing app under Tomcat 6 on Linux >> >> My version info: >> >> • Tomcat 6.0.28 >> • Java 1.6 >> • Ubuntu 10.4 >> >> >> I have a small debugging/monitoring app written in Java/Swing that I'd like >> to run inside Tomcat to help with debugging. The app is started by >> dynamically loading the monitoring class from a webservice running under >> Tomcat. The works in Windows (multiple flavors) but I'm having problems >> getting this running on Ubuntu. What I've tried so far: > > What does this give you that monitoring the application via JMX (see > VisualVM, jconsole), and debugging with your favorite IDE (NetBeans, Eclipse, > IntelliJ) doesn't give you? You can actually do both locally as well as > remotely (with a little bit of setup). > >> >> 1) First error I got was an Headless exception. Since the app is a GUI app I >> can't run in headless mode. After searching around I changed Tomcat's >> library path (via -Djava.library.path in catalina.sh) to point to the >> client lib (ie. .../java-6-sun-1.6.0.26/jre/lib/i386/client) instead of the >> server lib. > > Try setting JRE_HOME in the environment to point to a JRE installation > instead. Or use JAVA_HOME and point to the JDK. Tomcat will figure things > out. > > If your environment is not set up by default to do that (mine is with > custom.sh in /etc/profiles.d), create and use a setenv.sh script in > CATALINA_HOME. In this set any CATALINA_OPTS, JAVA_OPTS, and other > environment variables you need to. > >> >> 2) After changing the libs the next error was that DISPLAY wasn't set. After >> setting DISPLAY=0.0 in catalina.sh I get "Can't connect to X11 with >> DISPLAY=0.0" error. I've tried different values for DISPLAY (e.g. >> localhost:0.0) and nothing makes a difference. I've also tried fiddling >> around with the policies in case there's a permissions error. See below for >> the call stack. > > Are you running an X server? By that, are I mean is Ubuntu showing up in > whatever GUI you've chosen (I guess Gnome 2 is that version's default)? > > If you only have a command line interface, then there's no place to create > the screen. You can play games with a virtual frame buffer, but that will > just allow your program to run, but without any screen output (obviously). > > Again, don't set the DISPLAY environment variable in catalina.sh. Set this in > setenv.sh in the bin directory of CATALINA_HOME. There are lots of scenarios > here. Three common ones come to mind. > > 1. Local X server > > You're at the console and running in a GUI environment. The display > environment variable should already be set (typically :0.0). If you start > Tomcat with your application in this environment, the GUI interface should > just appear. > > 2. Remote client, accessing the GUI via a VNC server (such as TightVNC) > > Your display environment should already be set. For example, I'm currently on > a remote CentOS 5.8 system via VNC. My DISPLAY environment variable is set to > :0.2. If you start Tomcat with your application in this environment, the GUI > interface should just appear in the VNC viewer (for example TightVNC). > > 3. Remote client, X server > > Note that an X server means your PC is serving the screen, keyboard, and > mouse to a remote client (your application). To accomplish this you'll have > to have an X server running (if you're on Windows, try XMing), and you'll > have to set the DISPLAY variable appropriately. Running Java swing > applications in this fashion is not very pleasant especially if your program > is graphics-intensive. > >> The webservice app is a simple RESTEasy implementation. Since this works in >> Windows I'm assuming (perhaps erroneously) that this can work in Linux. Any >> help would be appreciated. >> >> Thanks, >> DG >> >> java . lang . InternalError : Can 't connect to X11 window server using >> ' : 0 . 0 ' as the value of the DISPLAY variable. >> sun.awt.X11GraphicsEnvironment.initDisplay(Native Method) >> sun.awt.X11GraphicsEnvironment.access$100(X11GraphicsEnvironment.java:52) >> sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:155) >> java.security.AccessController.doPrivileged(Native Method) >> sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:131) >> java.lang.Class.forName0(Native Method) >> java.lang.Class.forName(Class.java:169) >> java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:68) >> >> >> java.awt.Window.init(Window.java:380) >> java.awt.Window.<init>(Window.java:433) >> java.awt.Frame.<init>(Frame.java:403) >> java.awt.Frame.<init>(Frame.java:368) >> javax.swing.JFrame.<init>(JFrame.java:158) >> com.quinsoft.zeidon.objectbrowser.ObjectBrowser.startup(ObjectBrowser.java:60) >> >> > > > This should work just fine if you're running an X server on your Ubuntu > system. The DISPLAY environment variable should be :0.0 (no spaces) for a > local machine. > > . . . . just my two cents. > /mde/ > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > -- [key:62590808]
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