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 ...

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Error | Failed to generate a seed from SecureRandom within 3 seconds. Not enough entrophy? [closed]

Ubuntu Server 16.04 64 bit running on an OVH VPS Java JRE 8 u91 64 bit I'm using an OVH VPS server to run a BungeeCord Spigot Minecraft server network. When I run the BungeeCord.jar file, it starts ...
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How to fix my 'java' problem in Ubuntu 14.04 LTS?

I use Ubuntu 14.04 LTS. It all started when my eclipse-ide layout started to show some strange lines from now and then. In fact it started earlier when I tried to reconfigure java so it would run ...
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1answer
35 views

VLC suddenly keeps popping up with JAVA logo and ASCii colour art

I'm using Ubuntu Mate 16.04 LTS. I've installed it just yesterday and updated it immediately. Today I start my system up and VLC keeps popping up out of nowhere. It shows in a small window the JAVA ...
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32 views

How to setup selendroid in ubuntu 14.04? Cannot execute selendroid script. ANDROID_HOME not found error shown in eclipse console

I'm trying to set up selendroid in ubuntu for mobile app testing purposes. First I installed JAVA from ubuntu software center. Then I installed android SDK and I've set path in .bashrc as follows: ...
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3answers
53 views

How to start building desktop applications for Ubuntu Desktop? [duplicate]

I am willing to start building some application for Ubuntu distribution of Linux. I am a Java developer and mostly deal with enterprise systems and some small website with PHP in my free time. I am ...
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1answer
18 views

Black flashes on Minecraft

I recently installed ubuntu 14.04 on my laptop and wanted to install minecraft. It started perfectly fine (No black screens, no crashes) but after a few seconds, my whole screen goes black for 1 ...
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28 views

binary file cannot link to swt

I want to install TickWrite on my ubuntu 14. machine (64). When I run TickWrite binary file, I receive the following error at the end of the installation: TickWrite7 has been successfully installed ...
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37 views

Java based application is really slow

I am using Ubuntu 16.04. I have a big problem with java based application. When I use java based application, the application always become really slow. The application I used are Cytoscape and ...
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212 views

Is the GTK3/SWT bug fixed with the Eclipse Neon release?

I made a fresh install of Ubuntu 16.04 and I continued to install Eclipse Mars 4.2 as well. But every time I create a new project Eclipse hangs. I found out that there is a bug reported for this at ...
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24 views

Eclipse and Spring Tool Suit (STS) hangs all the time in ubuntu mate

I find this problem with many of the linux and eclipse users who are facing this problem. When I use any other application like chrome, vlc or gimp, ubuntu mate 15.10 works fine. But when I run ...
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26 views

How can I get a project from Ubuntu? [duplicate]

I'm a Computer Science undergraduate student. I'm looking for a opensource project for our 3rd year course Rapid Application Development(RAD). I am good in Python and Java languages. Where I can get a ...
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35 views

Upgrading to Newest Java 8 Update whilte using Update-Alternatives

I have two java versions installed on my PC (ubuntu 14.04): java 7 and java 8: felipe@felipe-XPS-8300:~$ sudo update-alternatives --list java /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java /usr/lib/...
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2answers
242 views

Java/minecraft problems

so i'm trying to install minecraft on Ubuntu 16.04 and i installed minecraft.jar cant run it it is excutive so it should run but it dos'nt java's file is there but it cant run either any suggestions?
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33 views

Getting this error, while running java program

Exception in thread "main" java.lang.UnsupportedClassVersionError: Hello : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader....
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2answers
56 views

Netbeans - Starting of Tomcat failed

I am trying to run Tomcat 7 from Netbeans 8.1 but getting the following output on the server console. java.util.logging.ErrorManager: 4: Unable to create [/usr/share/tomcat7/logs] java.util....
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55 views

How to test file upload spring web service using restful client?

I have a Restful web service that accepts large text files as input and parses them. How to test the web service using rest client like soap ui?
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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 ...
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0answers
34 views

Eclipse won't start from docky nor launcher

Eclipse won't start from docky nor launcher, even though I can double click it to start in nautilus. It told me: failed to change to directory '/eclipse' ( No such file or directory) I didn't ...
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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 ...
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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 ...
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1answer
50 views

Launching proper version of Eclipse IDE via i3wm

So currently I use the gnome desktop and somehow I ended up with 2 versions of eclipse. If I recall correctly, I installed one via the Ubuntu software center and the other from the eclipse website. ...
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2answers
100 views

How to find path to java?

I needed to update my openJDK to 8 version... And i was download new one this way sudo add-apt-repository ppa:openjdk-r/ppa sudo apt-get update sudo apt-get install openjdk-8-jdk sudo update-...
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1answer
295 views

Juniper on 64bit 16.04?

I am having the exact problem described at this question, but in 64bit 16.04 LTS instead. That is, when I try to run the Juniper VPN from my company web site, I get the successive messages "Please ...
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1answer
208 views

eclipse freezes in ubntu 16.04

I'm running ubuntu 16.04 on a dell xps 13, and I had java eclipse running ok. I did a mercurial commit from the command line, and I had some conflicts related to the eclipse metadata files. I managed ...
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1answer
228 views

Ugly font rendering with Android Studio on Java8

I am using Oracle Java 8 and Android Studio, but it is difficult to work with it because of the ugly font rendering. Here are some screen-shots. I am using Ubuntu 16.04 LTS 64 bit, Android Studio ...
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1answer
56 views

Minecraft server on Ubuntu 16 not saving worlds on shutdown

My kids and I are trying to determine the issue with Minecraft server not saving worlds on reboot. If we log off and log back in, any progress is still present, but if I reboot the machine, the world ...
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2answers
194 views

Install oracle-java7-installer showing error

I tried running the command in Ubuntu 16.04: sudo apt-get install oracle-java7-installer oracle-java7-set-default but it's showing an error: How can I install this package?
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0answers
52 views

JAVA -Version command is not working in one of the ubuntu user

java -version command is not working in one of the ubuntu user Main User naveen@naveen-ubuntu:/$ java -version java version "1.8.0_91" Java(TM) SE Runtime Environment (build 1.8.0_91-b14) Java ...
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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 ...
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2answers
576 views

Installing Eclipse Mars on 16.04

So I realized the eclipse version in the repositories is pretty old and I'm trying to upgrade to the current version. Every tutorial I've read basically has you download the installer as a tar.gz ...
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0answers
21 views

remote development with netbeans

I need to develope an application with jsp and java to handle a huge ammount of data (900 million data sets with over 100 fields). The idea is to use for the data processing an ubuntu 16.04 server ...
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0answers
41 views

How do I install java3d in java8

I tried to install java3d and have done something incorrectly since java is crashing. Here is what I did: Went to "Download Java 3D 1.5.1 Software" which went to my downloads directory. Changed to ...
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2answers
42 views

Connection Mysql fails

I need a little help installing/connecting an application to a mysql database. First time I faced many problems/errors, the most of them are gone and this is the result stull nothing haha... Does ...
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2answers
659 views

Java / Minecraft “Error: Could not find or load main class –Xms1024M”

I am not a Linux pro nor a Java pro, but I am setting up a Minecraft server on Ubuntu 16.04. System has 8GB RAM. I followed all the directions for setting up the server (which is very simple) but ...
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1answer
45 views

How to redirect ant to use java from jdk in /usr instead from jre in /opt?

I have followed a blog set up jre on my machine in /opt/ directory. Then I redirected firefox to use libnpjp2.so from /opt/java/64/jre1.8.0_73/lib/amd64/libnpjp2.so. Now I have to install another ...
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0answers
164 views

Eclipse freezes when making new Project or package or class

I am new to Ubuntu. I installed it yesterday :D. Please, I want a simple explanation for my problem. I have tried to uninstall then reinstall Eclipse but it does not work. This problem happened with ...
0
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1answer
32 views

Connection mySQL to ws02

Folks, Im facing a problem with connecting/creating mysql database/tables to ws02 instead of h2 ws02@ws02:/usr/bin/wso2/wso2emm-2.0.1/bin$ sudo -E ./wso2server.sh -Dsetup [sudo] wachtwoord voor ...
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1answer
83 views

Software package fails installing because of permissions

I'm busy installing WS02 on Ubuntu 16.04 LTS Server edition, right now I am facing some problems regarding permissions I guess below is my terminal log. I checked the directory with $JAVA_HOME and ...
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2answers
178 views

Is it necessary fix eclipse.desktop to use Eclipse launcher in Ubuntu 16.04?

I've been trying to use Eclipse in Ubuntu 16.04. I have read that, in order for Eclipse to work properly, it requires the following code to be inserted in eclipse.ini: --launcher.GTK_version 2 It ...
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0answers
31 views

Error while installing Manage Engine Product:Asset Explorer

As per Installation,I am getting: $ ./ManageEngine_AssetExplorer.bin InstallShield Wizard Initializing InstallShield Wizard... Searching for Java(tm) Virtual Machine... . Preparing Java(tm) ...
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0answers
13 views

iwedia4tv on ubuntu 14.04

I have dell r710 with exsi6. Created a virtual machine with vmware and installed ubuntu 14.04 lts 64bits. Activated 3D acceleration followed the indicated instructionions sudo apt-get update sudo ...
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0answers
71 views

Please ensure JAVA_HOME points to JDK rather than JRE

today when i opened my IntelliJ i get the Please ensure JAVA_HOME points to JDK rather than JRE error.i search the net and from this link i installed my jdk-8u60-linux-x64.tar.gz downloaded file but ...
1
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1answer
60 views

Matlab Installation Failure

I have installed Matlab 2016a on ubuntu, then the matlab-supporter and matlab-supporter-dev packages via Terminal with defining Matlab directory. However when I launch Matlab I saw an error as shown ...
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0answers
24 views

Netbeans8.0.2 won't start even ater i installed the java-oracle8 set

To install java8 on ubuntu,I used: $ sudo add-apt-repository ppa:webupd8team/java $ sudo apt-get update $ sudo apt-get install oracle-java8-installer To verify java version, I used: $ java -...
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0answers
1k views

How can i make java version1.8.0_91 my default java version?

When I type: java -version it says: joelle@joelle-Satellite-L745D:~$ java -version java version "1.8.0_91" Java(TM) SE Runtime Environment (build 1.8.0_91-b14) Java HotSpot(TM) 64-Bit Server VM (...
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votes
1answer
24 views

Compiling GUI Java Client, Penguin Icon instead of Window

I am trying to run a java client program on Ubuntu through command line. This program connects to a server program written in C. My java program has GUI and many classes, so when I compile it, I get a ...
1
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1answer
97 views

Java will not run at all and is not recognized as a command no matter how many times I install it

I have been fighting with Java for nearly a week now. Please bear with me, I'm very new to linux and Ubuntu. I first attempted to install the JDK as the following site had written, which did not work....
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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 ...
0
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1answer
91 views

Installing Eclipse Mars

I am in the installation process for Eclipse Mars, followed the YouTube tutorials, but somewhere I went wrong. I realized that I have Eclipse installed, but for some reason when I click on the icon in ...
0
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0answers
297 views

Oracle Java 9 installer fails in Ubuntu 16.04

I'm new to ubuntu i tried this one: sudo add-apt-repository -y ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java9-installer but it failed: download failed ...