Develop Reference

Run JavaFX with Visual Studio Code Remote Extension

I'm already trying for a few hours to run a JavaFX application with the help of the Visual Studio Remote Development extension within a Docker Container.
I want to forward the graphic of the application with the help of X11. I already integrated the required packages for X11 in the container, set the DISPLAY environment variable and mounted the X11 socket in the container (/tmp/.X11-unix/).
Unfortunately, it won't work like that... Whenever I try to run the application, I get the following error message:
root#c0699153fc1c:/workspaces/JavaFX/src# java --module-path /usr/share/openjfx/lib/ --add-modules javafx.controls,javafx.fxml HelloWorldApplication.java
Graphics Device initialization failed for : es2, sw
Error initializing QuantumRenderer: no suitable pipeline found
java.lang.RuntimeException: java.lang.RuntimeException: Error initializing QuantumRenderer: no suitable pipeline found
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumRenderer.getInstance(QuantumRenderer.java:280)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.init(QuantumToolkit.java:222)
at javafx.graphics/com.sun.javafx.tk.Toolkit.getToolkit(Toolkit.java:260)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.startup(PlatformImpl.java:267)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.startup(PlatformImpl.java:158)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.startToolkit(LauncherImpl.java:658)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:678)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.RuntimeException: Error initializing QuantumRenderer: no suitable pipeline found
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.init(QuantumRenderer.java:94)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:124)
... 1 more
Exception in thread "main" java.lang.RuntimeException: No toolkit found
I'm using openjdk:11 as base image for the docker container and installed the following packages inside of it:
openjfx
libx11-dev
libxext-dev
libxrender-dev
libxtst-dev
I previously already tried to run IntelliJ within a Docker container, which is working fine. The GUI gets forwarded to my Display and also JavaFX applications are working fine in there.
I would appreciate any help on this matter. Maybe I oversee something.
EDIT:
I think I found the problem. It seems like OpenJDK:11 and OpenJFX do not work correctly, even though I followed tons of tutorials...
So what I did now is that I exported the JDK, which comes with IntelliJ IDEA and mounted it into the container, which gets created of VS Code. After compiling the .java file with the mounted compiler and executing it, it worked flawlessly.
So now my only problem is, that I need a working setup within VS Code to get JavaFX applications working -> so a proper OpenJDK and OpenJFX configuration.

Finally, I was able to fix the problem. So the solution was:
I created an own Dockerfile, where I took the openjdk:12 image as base and copied the JavaFX libraries (which I got from here: https://gluonhq.com/products/javafx/) into the container. Additionally, I added all required packages for X11 (mentioned above).
In VS Code, after the container has been started, I simply had to add the libs to the "Referenced Libraries".
Afterwards, I had to adjust the launch.json and added the following vmArgs:
"vmArgs": "--module-path <Path-to-FX-Folder> --add-modules javafx.controls"
Now when I run the application, the window is going to be created and shown on my DISPLAY.

VisualVM is unable to profile a web application on Eclipse

I would like to profile my Spring Web Application that is running on Tomcat and Eclipse. I added VisualVM to the Eclipse and followed below steps to run the application for profiling.
Right click on the application name >
Run As >
Run Configuration >
Java Application >
'Selected Project' >
Set 'org.apache.catalina.starup.Boostrap' as a value for Main class,
also selected VisualVM as the Launcher > clicked on Run button.
The VisualVM starts but shows following message:
"Cannot open requested application"
Under local I can see VisualVM, Eclipse and Tomcat.
Following exception will be thrown and shown on console as well:
Exception in thread "main" java.lang.NoClassDefFoundError:
org/apache/juli/logging/LogFactory
at org.apache.catalina.startup.Bootstrap.<clinit>(Bootstrap.java:59)
Caused by: java.lang.ClassNotFoundException: org.apache.juli.logging.LogFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 1 more
I reckon the issue is because of wrong server selected. Maybe I should choose Tomcat but not sure how.

Probably an issue with an incomplete classpath when the VisualVM plugin launches Tomcat. You could try to correct the classpath of the start configuration which you created (e.g. try to add bin/tomcat-juli.jar from your tomcat installation) but I doubt this will work easily.
You can try the following:
start your Tomcat, e.g. from Eclipse
then manually start VisualVM: It is actually part of the JDK and located in <JDK dir>/bin/jvisualvm(.exe)
in the application list you should see the Tomcat process and then you can open it with a double click.

Try using Java Mission Control by running jmc. It is included in recent versions of the JDK.
See the getting started doc at http://docs.oracle.com/javacomponents/jmc-5-5/jmc-user-guide/index.html
Run your application, then open the jmc window and connect to the Tomcat process.

This is caused when a class file that your code depends on is not found at run time. This is purely an issue with the class path. Either the class is not exists in the class path or you have a different version of JAR file in the class path. The exception will go away if the class path is corrected.

Matlab has critical error from clean install (possibly OS X related?)

Using R2014b on OS X Yosemite.
Exception in thread "Startup Class Loader" java.lang.UnsatisfiedLinkError: jogamp.common.jvm.JVMUtil.initialize(Ljava/nio/ByteBuffer;)Z
at jogamp.common.jvm.JVMUtil.initialize(Native Method)
at jogamp.common.jvm.JVMUtil.<clinit>(JVMUtil.java:58)
at com.jogamp.common.os.Platform$1.run(Platform.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at com.jogamp.common.os.Platform.<clinit>(Platform.java:179)
at javax.media.opengl.GLProfile.<clinit>(GLProfile.java:83)
at com.mathworks.hg.peer.JavaSceneServerPeer.initializeJOGL(JavaSceneServerPeer.java:114)
at com.mathworks.hg.peer.JavaSceneServerPeer.<clinit>(JavaSceneServerPeer.java:100)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:190)
at com.mathworks.mde.desk.StartupClassLoader.loadClass(StartupClassLoader.java:258)
at com.mathworks.mde.desk.StartupClassLoader.access$900(StartupClassLoader.java:25)
at com.mathworks.mde.desk.StartupClassLoader$2.run(StartupClassLoader.java:244)
at java.lang.Thread.run(Thread.java:745)
This pops up the moment I start matlab. I am unable to use imagesc() or imshow() and probably loads of other functions, because matlab crashes with Caught unexpected exception of unknown type. instantly.
I'm at my wits end. The matlab install is fresh, and so is the OS. Same problem using the Java from Apple or the Java from Oracle.
EDIT: Response from MathWorks is that integration with Maple breaks everything. Emptying the .maplerc.sh file in the /bin/ directory fixes everything.

This issue is caused by having installed Matlab integration through maple. A file called .maplerc.sh is placed within the /bin/ folder in the matlab .app, and it apparently breaks everything. You cannot delete the file (this causes matlab to not launch on start up) but you can erase its contents. This will create an error upon launch, but you can ignore it and everything will work fine.
Uninstall matlab and maple, and reinstall maple and matlab without integration will fix the issue entirely.

Replace the contents of the file /Applications/MATLAB_R2014b.app/bin/.maplerc.sh by an empty line (as suggested by the other answer from Dorako), and
Modify the file /Applications/MATLAB_R2014b.app/toolbox/local/matlabrc.m, by searching for Maple in this text file and comment-out or remove the part between the two lines containing %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%.
The second step ensures that there is no error or warning message any more on startup, so that re-installing the programs is not necessary.

Running Java app from inside emacs using JDEE throws NoClassDefFoundError

I have configured JDEE in emacs. But when I try to run any App, it throws NoClassDefFoundError .
Upon compilation, although a class file is created, it only shows the buffer for sometime and then closes it.
The same files if compiled and run from the terminal work perfectly fine.
Also, on this machine I have java-6-openjdk installed. I had configured JDEE on my home computer which has sun java jdk and there are no such problems there.
Other than this, features such as code completion, generation etc work fine.
How do I solve this? Is this due to open jdk ?
I am using a Ubuntu 10.04 desktop.
This is the stack trace
cd /home/vineet/java/KodeJava/src/org/kodeplay/kodejava/
/usr/lib/jvm/java-6-openjdk/bin/java org.kodeplay.kodejava.EmacsTest
Exception in thread "main" java.lang.NoClassDefFoundError: org/kodeplay/kodejava/EmacsTest
Caused by: java.lang.ClassNotFoundException: org.kodeplay.kodejava.EmacsTest
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: org.kodeplay.kodejava.EmacsTest. Program will exit.
Process org.kodeplay.kodejava.EmacsTest exited abnormally with code 1
Thanks

something in your config is wrong. you are trying to run from the "/home/vineet/java/KodeJava/src/org/kodeplay/kodejava/" directory, but in order to find your class on the classpath, you should be running from "/home/vineet/java/KodeJava/src/". Probably need to configure the "jde-run-working-directory" variable.

From the question, it sounds as if the JDEE configuration is not complete when it comes to setting up the command to be launched when running the Java App.
If the same Java App can be run from the terminal with no issues, OpenJDK is not causing the trouble, I'd wager.
Perhaps you copied over from the other computer the JDEE configurations and did not adopt them for the new computer that has OpenJDK.

Mysql/j Connector Unloads Mysteriously Under Tomcat 6/JDK 6

Thank you for taking time to look at my question.
I developing a Java WAR file intended for distribution to only one server at a time. So far, I have tested on 3 different servers with success, one Debian, one Ubuntu and the other, the Windows machine I'm developing on.
On the final deployment server, for some reason the app deploys fine, and upon each startup, runs well for about 3 minutes. Database connectivity works, everything runs fine. After 3 minutes however, I start seeing NoClassDefFoundError's consistently every time the app tries to access the DB.
I'm the following libraries with all of them packaged in the WAR file:
Mysql/j Connecter, latest version
ActiveObjects, 0.8.2
Jasorb 1.3
Jython 2.5.1 (for some scripting)
Tomcat 6.0.20
mod_python
Apache
The error:
Exception in thread "Timer-4"
java.lang.NoClassDefFoundError:
com/mysql/jdbc/SQLError
at com.mysql.jdbc.Util.handleNewInstance(Util.java:430)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:352)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:284)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at net.java.ao.DatabaseProvider.getConnectionImpl(DatabaseProvider.java:771)
at net.java.ao.DatabaseProvider.getConnection(DatabaseProvider.java:734)
at net.java.ao.EntityManager.find(EntityManager.java:666)
at net.java.ao.EntityManager.find(EntityManager.java:607)
at net.java.ao.EntityManager.find(EntityManager.java:579)
at com.sq.sa.SAPushAlertsTask.run(SAPushAlertsTask.java:32)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
Caused by:
java.lang.ClassNotFoundException:
com.mysql.jdbc.SQLError
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:138
7)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:123
3)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 13 more

Either your MySQL/J connector is somehow broken OR (more likely) you have another somewhere jar in your classpath that has only some of the classes from MySQL's JDBC driver. Either way, "com/mysql/jdbc/SQLError" class can't be found.
Your application runs fine the first few minutes, then when some error occurs the above class can't be loaded which throws the exception as posted. Check your entire classpath (CLASSPATH env. variable + tomcat's lib + webapp's lib) and see whether a) you actually do have SQLError in it and b) MySQL JDBC driver does not occur more than once.
Once the above is fixed, you'll get an actual error that's causing this and should be able to take it from there.