Questions tagged [java]
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 on StackOverflow.com.
3,212
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How can I install Sun/Oracle's proprietary Java JDK 6/7/8 or JRE?
I want to install Oracle's JRE and to update to the latest version with the Software Updater when they released. Is there a Ubuntu package that is provided by Canonical or Oracle?
Before release Java ...
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4
answers
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How to set JAVA_HOME for Java?
I've installed a version of Java. How can we set the $JAVA_HOME environment variable correctly?
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12
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How to install OpenJDK 8 on 14.04 LTS?
Java 8 is now available according to http://openjdk.java.net/projects/jdk8/, but http://openjdk.java.net/install/ does not yet mention how to install OpenJDK 8 (not Oracle Java) on Ubuntu 14.04 Long ...
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How do I install Oracle Java JDK 7? [duplicate]
If I downloaded the latest JDK from Oracle, do I just download the .tar file and extract it to /usr/lib/jvm/?
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1
answer
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How to install Oracle Java on Ubuntu 14.04? [duplicate]
I am using Ubuntu 14.04.1 LTS, x64 architecture, and I specifically need to install Oracle Java. Now I know there are some instructions on the website which I follow but the same website does not ...
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9
answers
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How to completely uninstall Java?
How can I completely remove all traces of Java on my system?
I already know how to install it in case I need it again.
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199
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9
answers
1.3m
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How can I execute a .jar file from the terminal
I know that to execute a file, I use the . command, then the file name with a space between them. But I'm trying to execute a Java .jar file using the . and it does not work. I went into the ...
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191
votes
8
answers
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How to set default Java version?
I followed all the instructions stated at this question, but am encountering some problems with the last part of it.
I actually have version 6.22 of java and would like to update to version 6.30.
So ...
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190
votes
7
answers
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Switch between multiple java versions
While installing Android Studio on Ubuntu 14.04 I get the message that my Java version (javac 1.7.0_79) is causing problems. I found a solution of how to install a newer Oracle version of Java:
sudo ...
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186
votes
15
answers
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How do I install Java?
How do I install Java, including in my browser, so websites with Java work?
164
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4
answers
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update-java-alternatives vs update-alternatives --config java
On Ubuntu 12.04 LTS I have installed Sun's JDK7, Eclipse, and the Arduino IDE. I want the Arduino to use OpenJDK 6 and want Eclipse to use Sun's JDK 7.
From my understanding I need to manually ...
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134
votes
8
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How do I install openjdk 7 on Ubuntu 16.04 or higher?
I would like to upgrade my main system to 16.04, but I work on projects that require OpenJDK 7.
Apparently it is not available from a trivial apt-get install openjdk-7-jdk. Only versions 8 and 9 are ...
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124
votes
6
answers
1.0m
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How to compile a .java file on Ubuntu?
How can I compile a .java file?
What programs will I need? If I need the Java JDK I will also need help installing that. I'm very new to Ubuntu, so any program that I need to install I will need a ...
- 1,375
110
votes
7
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Assistive technology not found AWTError
$ java -jar aprof-plot.jar
Exception in thread "main" java.awt.AWTError: Assistive Technology not found: org.GNOME.Accessibility.AtkWrapper
at java.awt.Toolkit.loadAssistiveTechnologies(Toolkit....
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107
votes
10
answers
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How do I install Oracle JDK 6? [duplicate]
Most of the software is not thoroughly tested with Java 7 and I would like to install Oracle's JDK 6.0 on Ubuntu 11.10.
Could someone please provide me the instructions for the same?
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104
votes
7
answers
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Installing Java Automatically (With Silent Option)
I'm trying to install Java through apt-get.
I found this PPA of Java Installers, however, when I add the repository, update and then issue the apt-get install -y command, the installer for java ...
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104
votes
4
answers
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How can I tell what version of Java I have installed?
I want to start toying around with java (eventually getting to the point where I can write basic little programs for android or web), but I've managed to have java messed up on my computer (from past ...
- 1,467
91
votes
10
answers
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How to find my current JAVA_HOME in ubuntu?
How to find my current JAVA_HOME in ubuntu? I have to set java_home path when installing maven.
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85
votes
4
answers
200k
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Setting JDK 7 as default
four@twenty:~$ file /etc/alternatives/java /etc/alternatives/javac
/etc/alternatives/java:symbolic link to `/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java'
/etc/alternatives/javac:symbolic link to `/...
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votes
6
answers
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How to install the Java plugin for Firefox?
I am trying to install Java and plugins for Firefox. I installed both the JDK and JRE.
When I try with the sudo update-alternatives --config java command it shows only one choice available.
Plugins ...
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72
votes
14
answers
211k
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How do I make java default to a manually installed JRE/JDK?
I have Ubuntu 12.04 amd64 installed on my machine, on the previous versions of Ubuntu it was deadly easy, now there is this command update-java-alternatives with a really bad man page.
I just have my ...
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72
votes
2
answers
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Why is OpenJDK 10 packaged as openjdk-11-*?
While looking to compile OpenJDK from source, the newest General Availability version (OpenJDK 10.0.1) insists on OpenJDK 9 or 10. JDK 11, however, is not due to be released until September 2018.
...
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64
votes
5
answers
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Gradle in Ubuntu for Launchpad
It appears that Ubuntu doesn't have new versions of Gradle in their repositories for some reason. I need it for a project that will be build by Launchpad.
What should I do about this?
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62
votes
7
answers
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How to uninstall OpenJDK?
I don't want OpenJDK installed on my Ubuntu 13.04 system, but trying to uninstall the openjdk-7-jre yields the following message:
$ sudo apt-get purge openjdk-7-jre
Reading package lists... Done
...
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62
votes
2
answers
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views
How do I get Java plugin working on Google Chrome?
Google has updated its Chrome browser to version 35. This new version uses Aura in place of GTK2 and no longer supports NPAPI plugins like Java (both OpenJDK and Oracle). PPAPI plugins like ...
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61
votes
3
answers
293k
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Oracle-Java8-Installer: No installation candidate
I'm trying to install Oracle Java 8 on my Ubuntu Server (16.04 LTS, fully updated, x64), following this (very simple) guide.
After running apt-get update, I get the standard list of sites having been ...
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59
votes
4
answers
109k
views
Replace openjdk with oracle-jdk on Ubuntu
I have an ubuntu system and I want to replace my openjdk with oracle-jdk.
However if I remove my open-jdk and then install oracle-jdk, when I try to install some packages they want to install ...
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59
votes
1
answer
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How do I update Oracle Java (JDK and JRE)
Recently, I've installed JDK 7 from the Oracle site, using these instructions.
Now, I'm wondering what is the correct method to update it (or, better, to keep up-to-date automatically)? For instance, ...
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58
votes
14
answers
28k
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Android Studio update issue with jre/bin/java
While updating Android Studio I got the following error. The patch was downloaded and extracted, but there was some conflict with jre/bin/java Access denied. The error message is shown in the below ...
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58
votes
4
answers
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Is there a way to update all Java related alternatives?
Is there a way to quickly switch over all the Java related alternatives using update-alternatives?
For instance, if want to switch Java over to 7, I run sudo update-alternatives --config java and ...
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58
votes
5
answers
21k
views
phpStorm losing keyboard input
Every now and again phpStorm will lose input from my keyboard. I can still click around, but it will not register any keys. Other windows are fine. It takes a phpStorm restart to bring them back. It ...
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54
votes
7
answers
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Installing Chrome Java Plugin
I've been trying to install the Java plugin for Chrome for a couple hours now, and I figured it was time to ask people with more experience. I can't seem to get it working. My current Java version is ...
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votes
7
answers
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How to upgrade Java on Ubuntu?
I installed Ubuntu on my computer, and now my Java version is not updated. I have Java, so I don't need to install - just update the current version.
Can someone please tell me the command I have to ...
- 607
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votes
1
answer
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Downgrading Java 11 to java 8? [duplicate]
How can i downgrade the java version 11 to java 8. As i need jenkins, current jenkins versoin doesn't support java 11. I need to downgrade.
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votes
10
answers
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How to correctly remove OpenJDK/OpenJRE and set SunJDK/SunJRE as Default
Ubuntu seems to favour OpenJDK/JRE very much over Sun JDK/JRE. Even after I installed Sun JRE, JDK and plugin and spent some time plucking out OpenJDK-related packages, apt-get has installed them back ...
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48
votes
4
answers
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How to find path to java?
I needed to update my openJDK to 8 version... And I downloaded the 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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48
votes
9
answers
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views
'tools.jar' is not in IDEA classpath
I am a new user of Linux, it has been recommended to me by my friend.
He told me to install software called IntelliJ Idea IDE.
Well I have been following the tutorial. But now when I try to open "...
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47
votes
8
answers
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How to set the JDK for Android Studio?
I can't compile a default new project for Android 2.1 because(?) the JDK used by Android Studio is JDK 1.7 but it should be JDK 1.6.
To change it I go to File -> Project Structure and try to find the ...
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46
votes
8
answers
18k
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How can I remove duplicate icons for "launched" java programs in the launcher?
When launching java programs (like IntelliJ IDEA and Crashplan) in Natty's Unity launcher, duplicate icons are shown (see image). For IntelliJ I created the .desktop file, for Crashplan the .desktop ...
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42
votes
5
answers
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Specify JDK for tomcat7
I have installed tomcat7 (using apt-get install) and whenever I want to start tomcat7 it says :
* no JDK found - please set JAVA_HOME
I have set JAVA_HOME in my bash.bashrc and also in ~/.bashrc and ...
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41
votes
6
answers
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views
Setup and install IntelliJ with JDK
Is there any scripts for downloading and installing IntelliJ with JavaJDK or OpenJDK?
I don't know how I did it before using Ubuntu 12.10 but I'm now on a fresh 13.04 install and I have been looking ...
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39
votes
3
answers
44k
views
How can I get a java apps to use the GTK+ theme?
Is there a way to get java apps to use my gtk theme?
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2
answers
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"sha256sum mismatch jdk-7u3-linux-x64.tar.gz " error when trying to install Oracle Java
i recently tried installed java 7 on ubuntu 12.04 and i think i screwed something up
I followed the instructions given here.
First you need to remove openjdk for this run the following command from ...
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votes
4
answers
74k
views
Fix scaling of java-based applications for a high DPI screen
There are some applications (mainly java based) that don't follow the global 2x scale I set in the screen-settings. So these apps are really tiny on my high DPI screen with 3200x1800px.
How can I get ...
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35
votes
1
answer
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How to run a .jnlp file in ubuntu server
I am trying to run a .jnlp (java) file in Ubuntu Server. This file is BitCoin minter. When I try to run it, it says access is denied.
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12
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How can I install Minecraft?
I have tried many tutorials but none of them are clear enough. I have also tried installing it using Wine but it won't update and Wine goes gray and stops working.
Does anybody know an easy way to ...
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votes
4
answers
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How to replace OpenJDK 6 with OpenJDK 7?
Surprisingly (as OpenJDK 7 was released to general availability about 4 months ago) Ubuntu 11.10 still uses OpenJDK 6 instead of 7 by default. How do I best fix this? I'd prefer to remove OpenJDK 6 ...
- 57.5k
33
votes
4
answers
89k
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How can I uninstall oracle java 8 and install oracle java 7 instead with webupd8 installer?
I installed oracle java 8 by typing in terminal:
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
but now I want to uninstall oracle ...
- 611
32
votes
4
answers
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netbeans not all requested modules can be enabled
I know this question has already been posted, but the solutions provided don't work for me.
I added the webupd8team/java repository and installed oracle-java8-installer and oracle-java8-set-default.
I ...
32
votes
3
answers
28k
views
How to start a GUI application from cron?
I need to run a Java applet from a Firefox. The problem is, I need to run this Firefox from a cron. If I run from the command line and its work fine, but when put the command in the cron it failed:
*/...
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