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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Can't Install Open JDK? [duplicate]

I'm trying to Install Minecraft On Ubuntu 12.04 lts. When I try to install Open JDK it gives me this message: The following packages have unmet dependencies: openjdk-6-jre: Depends: ...
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113 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 ...
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179 views

“The Eclipse executable launcher was unable to locate its companion launcher jar.” How can this be solved?

I am trying to install Eclipse for Java EE but everytime I try to run Eclipse using the terminal it will give an error of The Eclipse executable launcher was unable to locate its companion ...
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0answers
107 views

Problem with OpenJRE on Ubuntu

So, I installed OpenJRE from the Ubuntu Software Center, and then I click on Minecraft.jar and select "Open with OpenJDK Java 7 Runtime", and nothing happens. Then I go to terminal and type (While in ...
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745 views

Setup JDK for android studio

I was setting up android studio and got this So I followed the answer here and used sudo update-alternatives --set java /usr/local/java/jdk1.7.0_17/jre/bin/java sudo update-alternatives --set ...
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14 views

How can you install Oracle Java JDK 7 without an internet connection with noob friendly instructions? [duplicate]

Is there any way that you can easily and I mean easily install Oracle Java JDK 7 in ubuntu with absolutely no internet connection. I'm asking because I am completely new to things(noob and newb) like ...
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1answer
97 views

Playing Minecraft in Ubuntu - Black lines

Help me please. Complete novice on Ubuntu ( on day 2 ) and trying to get this working for son for his christmas present ( one of many!!! ) I have Ubuntu 13.04 installed, have followed the ...
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1answer
155 views

JAVAC is not in the jdk path but java -version says JDK is installed

When I type javac in the terminal, this is what I get: The program 'javac' can be found in the following packages: * default-jdk * ecj * gcj-4.6-jdk * openjdk-6-jdk * gcj-4.5-jdk * ...
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1answer
617 views

How to uninstall JDK

Today I installed Android Studio but when I opened it raised the error: 'tools.jar' seems to be not in Android Studio classpath. Please ensure JAVA_HOME points to JDK rather than JRE. I ...
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votes
1answer
3k views

Java memory usage ballooning to all RAM when running Minecraft Server

When I run Minecraft server, over time (a few hours to a few days) the memory usage by Java balloons to take up all available computer memory and the server performance then degrades: lags, players ...
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1answer
108 views

Error on installing eclipse from software center

I have installed eclipse from the software center and when I open it I get the error that sayt to see a log file. The log file is in ~/.eclipse/org.eclipse.platform_3.7.0_155965261/configuration path ...
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46 views

open jdk and chrome

Hi I currently have open jdk and I am using chrome on 13.04 ubuntu. I don't see any java plugin currently installed in about:plugins. I am trying to use a cisco vpn client via the browser. Do I need ...
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1answer
400 views

MatLab installation from .iso problem

I tried installing MatLab on Ubuntu 12.04 from an .iso, unsuccessfully. The .iso file is mounted, but when I go to the mounted folder and type ./install , I get this error message: Error: Cannot ...
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1answer
38 views

How to host Java based website?

I am a web developer. I have developed a website based on Java, Hibernate and Oracle Database Technologies. I want to host this website on internet. Previously, I use to contact 3rd party ...
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0answers
189 views

Web Development in Ubuntu 13.10?

I am a Web Developer and Java Developer. I have already installed JDK and Eclipse. I need a Web Development and Designing Software like Dreamweaver for my Ubuntu 13.10. I normally work with below ...
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3answers
169 views

Made an executable .jar , runs on Windows but Ubuntu doesn't run it?

I made the following small file with Eclipse, using the SWT Library: //all the imports public class classtest { public static void main(String[] args) { Display display = new Display(); ...
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0answers
23 views

Problem in opening SDK manager in Eclipse

When I click on Android SDK manager, a window pops up and says opening SDK manager shortly but then the window collapses and nothing happens
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1answer
550 views

installing java in ubuntu [duplicate]

this is my first time using linux ubuntu. I'm trying to install java, i downloaded the file from the java website, extracted the file to the desktop and the extracted file's name now is jre1.7.0_45 ...
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3answers
9k views

upgraded to 13.04 now getting JREDetection "Your security settings have blocked an untrusted application from running

I upgraded Ubuntu 12.10 to 13.04 upgraded java to 1.8.0-ea-b118 and still cannot run my application to connect to my office. I have checked all the options and spent all day looking for hits on this ...
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1answer
86 views

Java out of memory error during the installation processor of netbeans

I am getting java out of memory error when try to install netbeans. System : Linux shantanu 3.11.0-14-generic #21-Ubuntu SMP Tue Nov 12 17:04:55 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux Ubuntu ...
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0answers
296 views

Matlab 2013b on Ubuntu 12.04 MATLAB_JAVA problem

I'm on Ubuntu 12.04 and I have installed Matlab 2013b. It's running. However, I have some graphical issues like empty windows and unreadable hints. I found out that its due to the java version 1.7: ...
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0answers
22 views

How to increase permgen space of java in Ubuntu 13.04

How to increase permgen space of java in Ubuntu 13.04? I am using java Sun/Oracle JDK 6
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0answers
67 views

Cannot install Icedtea Java Plugin

I cannot install the Icedtea Java Browser Plugin to run Java applets. It shows some error message as given in the attachment. Please help me solve this error. It shows this error message: Package ...
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1answer
26 views

can i again reinstall java on ubuntu?because both windows and ubuntu is in my system and java is configured on windows?

iam new to ubuntu. i have been working on windows. My question is can we run web application developed in windows on ubuntu? both windows and ubuntu is installed in my system java is congigured on ...
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1answer
28 views

Launching rmid problem on Ubuntu 12.04

I have java version "1.6.0_21" Java(TM) SE Runtime Environment (build 1.6.0_21-b07) Java HotSpot(TM) Client VM (build 17.0-b17, mixed mode) installed. When I type rmid in the command line, I get ...
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96 views

java applet at startup with crontab not working

I know the question is asked in many variants and I have read them, but still cannot find an answer to my problem. I have a jar file which I want to run at startup as root. I have tried in rc.local, ...
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1answer
458 views

Run a 32 bit software on a 64 bit architecture under Ubuntu 13.10

I need to use a software which already works fine in a 32 bit Ubuntu 10.10 virtual machine, with my 64 bit Ubuntu 13.10. I found all the executable files and copy/pasted them into the same directory ...
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3answers
43 views

How to determine command location?

I need to use keytool and I want to use possible newest version. I have on my Ubuntu oracle jdk, and OpenJDK. ~$ java -version java version "1.7.0_25" Java(TM) SE Runtime Environment (build ...
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0answers
107 views

libc - Ahsay OBM

I have probelms to get Ahsay OBM client for Linux running due to problems with libc. I'm running Ubuntu Server 12.04.3 LTS. I get the following error: # sudo /usr/local/obm/bin/RunBackupSet.sh ...
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2answers
343 views

Best Practice for Installing Java on Ubuntu / is it secure?

Much has been said about the security risks associated with Java. However the burp suite (pen test) depends on Java. Is it secure to install Java? if so, how to properly do it? My Ubuntu is a web ...
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0answers
42 views

Why do sysstat and top seem to give completely different RAM statistics?

I'm using ubuntu to run a Minecraft server, and I've been having memory usage problems lately, so I set up sysstat to log usage data every 10 minutes. However, I've been noticing some major ...
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2answers
3k views

JAVA blocked due to security level on Ubuntu 13.10

JAVA being blocked because of security level. However, I am aunable to alter security levels in Ubuntu. I have dated to the latest JAVA: sudo add-apt-repository ppa:webupd8team/java sudo apt-get ...
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vote
1answer
851 views

Eclipse Kepler crashes without any log entry [duplicate]

I'm using Ubuntu 13.10 Saucy Salamander 64bit and Eclipse Kepler 64bit terminates after some random time without response. The windows simply disappears. There's also no entry about the crash in ...
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0answers
37 views

Problem setting up minecraft coder pack and forge

recently I learned java and now I would like to create my own mod for minecraft. So I followed this tutorial on setting up MCP and forge: http://www.youtube.com/watch?v=klYTEMiATZw I followed all ...
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votes
1answer
262 views

Installation and configuration of Java 3D in ubuntu

I'm new to ubuntu. My java 3d project using netbeans is running fine in my windows environment. But when I run project in Ubuntu 12.04 it shows this exception: java.lang.UnsatisfiedLinkError: no J3D ...
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0answers
978 views

When I start Eclipse 4.3 I get “Invalid Configuration Location” error

When I first installed Eclipse 4.3 (Kepler) it ran A-Okay. I even did a Java program. When I shut down Eclipse and ran it again later, I got the error message below. Thinking I did something wrong ...
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0answers
42 views

Custom folder locations for Java & wine programs

I have customised the default folder locations for Documents, Downloads, Pictures, etc by modifying the ~/.config/user-dirs.dirs. I use a separate NTFS partition to be able to use the same folders on ...
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0answers
77 views

PATH variable to Apache OPENNLP OK but doesn't work

yesterday I installed in my Ubuntu AWS 12.04 (Amazon) micro istance OpenNLP and seemed working. Today when digiting opennlp:command not found Following suggestions found here: I modified my ...
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votes
1answer
243 views

I cannot install xtreme download manager! [duplicate]

i followed the instruction given in the sourceforge forum but it didn't work.Pls tell me some solutions. cd xdman/ chmod +x xdman.sh ./xdman.sh ./xdman.sh: 2: ./xdman.sh: java: not found sudo ...
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votes
1answer
18 views

ALEKS plug-in on 12.04

I'm running 12.04 and have successfully installed the latest version of JDK. I've followed the instructions on this page to install the plug-in for ALEKS, and that worked. But when I log in to ALEKS ...
0
votes
1answer
58 views

How to install both 64 and 32 bits version of Java at the same time?

I am trying to get a game to work (Wakfu). I tried to apply most of the info here, but nothing helped me at all. I have Ubuntu 12.04 and I would like to install java32 run-time alongside java64. ...
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vote
4answers
984 views

Eclipse Error on Ubuntu 13.10

I have successfully installed Oracle Java 64 bit version on my machine (checked with java -version). Later I have downloaded Eclipse Kepler 64 bit but when I start it, it does not work and it is ...
0
votes
1answer
77 views

Uninstalling Java (only) after installing Restricted Extras

I've Googled it and searched a lot but didn't found specifically targeted question in this way. So I really don't want Java. I want to get rid of it. When seeing it in Software Updater, it seems ...
0
votes
1answer
64 views

Java -jar using Oracle lib

I have installed java-7-openjdk and it works well, but I need to use JavaFX in a project so I download "Java SE" (all packages) form Oracle and I store them inside/usr/lib/jvm/jdk1.7.0_45. Now I want ...
2
votes
2answers
1k views

What is the difference between default-jdk, ecj, gcj and openjdk?

This morning, I tried to install something and came across a statement like this: The program 'javac' can be found in the following packages: * default-jdk * ecj * gcj-4.6-jdk * gcj-4.7-jdk * ...
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vote
2answers
69 views

How to build Ubuntu Applications using java? [closed]

Actually I have done Core Java 3 years ago , and after that JSP(Java Server Pages), Springs, Hibernate .What I need is to know is how can I make ubuntu based application using Java , as this is the ...
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0answers
68 views

Eclipse crashes my desktop every time I use the Graphical Layout Editor for android

Every time I try to move a View in my activity layout I get a black screen which I don't have the time to even read and then poof I'm logged out of my Ubuntu desktop. Every single time. Anyone has ...
1
vote
1answer
415 views

installing Oracle Java 7 as Firefox (v. 22) plugin fails

I have installed Oracle Java 7 JRE under Ubuntu 12.04, and I am trying to get firefox (v. 22) to recognize it as a plugin. I've carefully followed these instructions: ...
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0answers
27 views

Runescape - Ubuntu 12.04 - Jaggex cache folder

does anyone here know how to hide the jaggexcache folder, jagexappletviewer file and jagex_cl_runescape_LIVE file from the home folder? The problem is this, everytime you play runescape (in both ...
0
votes
1answer
468 views

Netbeans doesn't start, Java fatal error, unless sudo

Fresh 13.10 64b Openjdk 6 is there, I just installed Netbeans 7.01 from the repo, but it doesn't work, I open then a console elect@elect-desktop:~$ netbeans # # A fatal error has been detected by ...