Java is a programming language originally developed by Sun Microsystems. Questions here should be about the installation, configuration and troubleshooting a JVM (Java Virtual Machine) or a JRE (Java Runtime Environment). Programming questions (unless directly related to Ubuntu) should be asked ...

learn more… | top users | synonyms

4
votes
0answers
278 views

OpenJDK, IcedTea security settings

I am a beginner Linux user. From my knowledge the system uses OpenJDK and IcedTea only when I connect to a SAP IDES server through SAP GUI JAVA adding a string in it to connect to that server. I use ...
4
votes
0answers
64 views

Window Transparency with Java

I'm using a java application that relies heavily on window transparency it to work properly (windows apparently fade on top of each other to make them cross over each other). On Windows it works just ...
3
votes
0answers
152 views

Java crashes with fatal error

I'm trying to get SweetHome3D to work on Lubuntu 16.04, but it crashes immediately after starting. I get the following error message: > sweethome3d Java 3D: implicit antialiasing enabled # # A ...
3
votes
0answers
21 views

Ubuntu : UDP message generation / receive low rate issue

I have two simple java programs to generate and receive UDP messages using DatagramSocket . Generator String message = "MyMessage"; byte[] data = (message).getBytes(); DatagramPacket packet = new ...
3
votes
0answers
40 views

Is there anything wrong with java-package?

There is a question about How can I install Sun/Oracle's proprietary Java JDK 6/7/8 or JRE? There are 23 answers at the moment, most of them are either explaining how to do it manually (unpack, move ...
3
votes
0answers
170 views

Global Menu for JavaFX Applications

I know that we can enable global menu for Java Swing applications using Jayatana. But I am searching for global menu support for JavaFX applications. After searching on it, I have found that ...
3
votes
0answers
643 views

How to remove Eclipse Mars.1 installed using oomph installer

I've installed Java-EE Eclipse Mars.1 in Ubuntu 14.04. And now I have problems running different bundles of Eclipse. Besides this installer created a weird shortcut .local/share/applications/eclipse....
3
votes
0answers
92 views

Ubuntu 15.04 crashes with scattered screen

I have recently installed 4GB DDR3 RAM (Innex) with an existing 2GB RAM (Dynet), currenlty it runs with 6GB RAM. I use Eclipse, Java, Chrome extensively for my development purpose But after this ...
3
votes
0answers
617 views

how to enable webex on 14.10 64bits

I had issues to join Cisco Webex in Firefox on 14.10 64bits. Here is my experience to make it work. First, you need to install either openjdk/icedtea or Oracle Java as the JRE. You should be able ...
3
votes
0answers
455 views

How to use Firefox AppArmor profile with IcedTea Java plugin on Ubuntu 14.04?

Whenever I set up Ubuntu on a new system, I active the default AppArmor profile for Firefox via sudo aa-enforce /etc/apparmor.d/usr.bin.firefox Doing this on Ubuntu 14.04, however, makes Java ...
3
votes
0answers
189 views

How to do a ppa for a java ant project?

I was doing a launchpad ppa for my ant project using jdeb. when I had the unpleasant surprise in the last step that ubuntu ppa actually builds the package from the repository, not just accepts signed ...
2
votes
0answers
17 views

Java obfuscator?

I do Java development and I was wondering if there is a Java obfuscator that I can install on Ubuntu GNOME 16.04 with GNOME 3.20? That is one that I could give the code to and it would do things like ...
2
votes
0answers
70 views

Problems with Java and Symlinks

i'm having troubles with the java jar files symlink. First of all i've to use java -jar command if i don't do it the java file doesn't run properly. Well the problem starts when i symlink the jar file,...
2
votes
0answers
406 views

java-8-oracle (1.8.0_66) problem with PrintAssembly “Could not load hsdis-amd64.so”

I'm trying to run my programs with -XX:+PrintAssembly options but I always get message like: Java HotSpot(TM) 64-Bit Server VM warning: PrintAssembly is enabled; turning on DebugNonSafepoints to ...
2
votes
0answers
40 views

Using Screen inside /etc/init

I am trying to launch a .jar inside a screen session at boot using /etc/init Here is my script (pretty standard:) start on runlevel [2345] stop on runlevel [^2345] console log chdir /home/...
2
votes
0answers
58 views

Use DEB for distribution of WAR?

I have created a Java EE program with a WAR-file as a result. To run this file I use the JBoss Wildfly 8 server. Now I have multiple Ubuntu systems where I want to install the Wildfly server and run ...
2
votes
0answers
29 views

issue in java runtime

I have Ubuntu 14.04 64 bits on lenovo z5070 laptop. I've installed java on my laptop but I think that It doesn't work correctly. Because It usually warn me about a problem and make a log file. I've ...
2
votes
0answers
525 views

Firefox won't run java after installing 15.04

I installed ubuntu 15.04 yesterday. Firefox will not run the race viewers at igpmanager.com which use java. Ran java version and it returned the latest version of java. This machine is running an SSD ...
2
votes
0answers
243 views

The installed java is version 7u65, yet the ubuntu package is 7u71, why the discrepancy?

I'm running Ubuntu 14.04 and need to use Java 7 update 71. It seems like openjdk has been updated in the Trusty repos to update 71, yet even if I install the update java seems to still be at version ...
2
votes
0answers
219 views

Why doesn't lsof show localhost TCP connections in 14.04?

I have two servers running 12.04.4 and 14.04.1 respectively. Both have nginx (port 80) and a Java process (port 8080). As expected, the lsof output for the Java process (sudo lsof -nP -p $PID) on ...
2
votes
0answers
463 views

Unable to start topcoder arena in Ubuntu 14.04

When I want to clear cache using javaws - viewer these error comes. I am trying to launch my topcoder arena. Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar Exception in ...
2
votes
0answers
587 views

How to open jar file with doubleclick after upgarade to 14.04?

After upgrading to 14.04. I ran into problems with opening .jar files. Double clicking on Client.jar doesn't open it. I tried right clicking and selecting both , OpenJDK Java 7 runtime and OpenJDK ...
2
votes
0answers
104 views

Weird java memory allocation

My task manager shows that for my java process memory allocated is 16777216.0 TB (yep, TB). It happens when programming swing application with eclipse 3.8. Oh, and my distro is lubuntu 14.04. Nothing ...
2
votes
0answers
680 views

How can I improve the font rendering of Swing Java applications under Ubuntu?

Some Swing-Java programs in Ubuntu look very ugly because of their font. What's wrong with the fonts? Is there any way to fix the aliasing?
2
votes
0answers
163 views

Stuck on render ring in fullscreen when having used `xrendr -o right`

At work I am supposed to get a Java application running in fullscreen on a big-screen tv. This TV is connected to a Intel Nuc device, which is running Lubuntu 13.10. This TV is hanging on the wall ...
2
votes
0answers
388 views

Install java on a wine in a linux terminal server

I have a Windows terminal process (which requires Java). I need to run this in a Linux terminal server (it's an Amazon EC2 instance). I installed Wine, but now I need to install Java. When I try to ...
2
votes
0answers
165 views

I tried to transplant the wireless_tools to Android4.0 system, but I have a problem with Java

My Linux system is Ubuntu Kylin, a new branch of Ubuntu spreading mainly in China. I have changed some files, such as wireless.22.h, ifrename.c and iwlib.h, in wireless_tools.29/ which is located in ...
2
votes
0answers
548 views

Install 32 bit JRE on 64 bit Ubuntu 12.04 for Nokia SDK 2.0

I have successfully install java for my ubuntu through terminal but in mobile project want to include Nokia SDK 2.0 but this Platform is not able to run without 32bit jre. Error The SDK could not ...
2
votes
0answers
130 views

How Can I Change Jamvm on my embedded system to Openjdk?

I have one Embedded System Currently working On jamvm. I Want to change it to openjdk. How Can I do that???
2
votes
0answers
208 views

Starting minecraft logs me out of ubuntu 12.04

Whenever I start minecraft I can only get past the login screen. After that, the screen flashes dark, occasionally showing a Checking battery state ... [OK], and then it brings me to the login ...
2
votes
0answers
113 views

Help with Java: I want to reduce how many Java installed I have down to 1.

I have used many different methods to install java because I want to get Minecraft working. I heared that if I uninstall Java it would installed Libre Office, which I do not want to do. I have a ...
1
vote
0answers
13 views

Minecraft crash

i'd like to play minecraft on ubuntu 16.04 but i keep getting this error ---- Minecraft Crash Report ---- // Hi. I'm Minecraft, and I'm a crashaholic. Time: 7/26/16 3:03 PM Description: Initializing ...
1
vote
0answers
15 views

Run .jars Without java -jar Invocation

I often run Java .jar files, but in order to do so, I must invoke it with the command java -jar myJar.jar. Simply making the .jar executable will not allow it to be run, since it is not fully ...
1
vote
0answers
29 views

Java doesn't work (IcedTea )

I installed IcedTea Plugin on Ubuntu 14.04 LTS using Firefox. I receive this error message: Problem initializing runtime environment. Changing the SecurityManager is not allowed. I am not very ...
1
vote
0answers
20 views

Error during Eclipse plugin installation

I'm new in Ubuntu. I have installed Eclipse (Mars2) on Ubuntu, it is working fine as a basic IDE. But whenever I would like to add a plugin (help -> Install new software...) I got a question about if ...
1
vote
0answers
41 views

briss is not working on Xubuntu 16.04

I just installed Xubuntu 16.04 (was running Xubuntu 14.04). I noticed that the program briss, which crops pdf files, is not working (SIGSEGV, ya crash!). But it worked flawlessly on Xubuntu 14.04. ...
1
vote
0answers
21 views

Alsa chroot java program doesn't find microphone

I made a chroot environment from an architecture i386. Now I installed ALSA on it (alsa-base, alsa-utils, asound2). I mounted the proc,sys and dev directory too. Then I tested my microphone with the ...
1
vote
0answers
26 views

Why can't java find my fonts?

Whenever I try to run any jar file via java -jar file.jar, I get an exception saying: Exception in thread "main" java.lang.NoSuchFieldError: fontFile I just earlier today was having the same issue ...
1
vote
0answers
29 views

Java Applet on Ubuntu Web Server

I have an java applet to sign documents digitally: http://www.pki.sanluis.gov.ar/PkiAsp/Paginas/Pagina.asp?PaginaId=54 I have a middleware to do this from a smart card. I can't export the private key ...
1
vote
0answers
165 views

Eclipse hangs when creating project on Ubuntu (Vbox)

I'm running Ubuntu 16.04 on Virtual Box. It's the 64 bit version, and I have allocated 1024 mb of ram. My problem is when creating a new Java Project in eclipse, it just hangs and takes forever. I ...
1
vote
0answers
241 views

installation of openjdk-8 vs oracle jdk8

I am using Netbeans which I prefer Oracle jdk8. Just now Ubuntu said I had an incomplete upgrade to 16.04. No problem, I let it do its thing. To my surprise it removed Oracle JDK and put openjdk in ...
1
vote
0answers
46 views

Remove Oracle JRE 8 browser plugin installed

I'm on 14.04 and have the ppa Java 8 installer running on the box. It's okay to have it to install Java 8 in general, but in detail it has the flaw (at least in the way I use it) that it installs a ...
1
vote
0answers
173 views

Install 32 bit OpenJFX in 64Bit Ubuntu

I'm still not sure of this will fix my printing problem, but I'm trying to revert my Java into a 32 bit version, after finding out my 64 bit Java doesn't communicate with CUPS. (Ubuntu 15.10 64 bit) ...
1
vote
0answers
48 views

var lock issue right after installing JDK and soapUI on my machine

I have been dealing with an issue all day here. I cannot seem to have apt-get work for anything whatsoever. I have been through several parameters here including trying these following solutions: ...
1
vote
0answers
63 views

Minecraft hangs itself when launching

When I start minecraft, I get the following: marc@marc-desktop:~$ java -jar '/home/marc/Schreibtisch/Minecraft.jar' Bootstrap (v5) Current time is Feb 19, 2016 8:42:21 PM System.getProperty('os.name'...
1
vote
0answers
47 views

Oracle JAVA IDEs freeze

I experience a freeze since few months. I'm using Phpstorm and since june I has to downgrade java (oracle, phpstorm can't work with openJdk) jdk from 8 to 6 to avoid a freeze when the IDE is indexing ...
1
vote
0answers
270 views

Can't find JDK for Unity3d development

I'm developing on Unity3d 5.2 a game which should be build for an Android. I use Ubuntu 14.04. I used: sudo apt-get install openjdk-7-jdk to install java. Set $JAVA_HOME and $PATH variables in ....
1
vote
0answers
192 views

Downgrade java from 1.7.0_91 to 1.7.0_79 on ubuntu

my ubuntu machine contains java 1.7.0_91. how to install java 1.7.0_79. how to Downgrade java from 1.7.0_91 to 1.7.0_79 on ubuntu java -version output: java version "1.7.0_91" OpenJDK Runtime ...
1
vote
0answers
113 views

Minecraft launcher won't open

I have a problem with my Minecraft launcher. I go and start up the launcher, then everything seems to be working right at first, but then it stays on the loading screen. This is what is says: Please ...
1
vote
0answers
42 views

Force file creation time for all files transferred to a directory

Is there a way in Linux to change the creation/last access time/last modified time by default, whenever new files are transferred or copied. Currently, I need to poll a directory for files and ...