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.

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577 votes
28 answers
922k views

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 ...
Benjamin's user avatar
  • 10.2k
186 votes
15 answers
479k views

How do I install Java?

How do I install Java, including in my browser, so websites with Java work?
249 votes
0 answers
339k views

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/?
user22744's user avatar
  • 2,501
203 votes
9 answers
983k views

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.
CaldwellYSR's user avatar
  • 2,197
33 votes
12 answers
110k views

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 ...
jnut's user avatar
  • 2,784
160 votes
4 answers
610k views

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 ...
Stan Smith's user avatar
  • 1,703
32 votes
3 answers
27k 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: */...
fadabi Nawi's user avatar
107 votes
10 answers
319k views

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?
Praveen Sripati's user avatar
134 votes
8 answers
403k views

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 ...
onairda's user avatar
  • 3,045
197 votes
9 answers
1.3m views

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 .jar file using the . and it does not work. I went into the properties and ...
jaorizabal's user avatar
  • 3,748
392 votes
4 answers
1.5m views

How to set JAVA_HOME for Java?

I've installed a version of Java. How can we set the $JAVA_HOME environment variable correctly?
Gaurav Agarwal's user avatar
7 votes
2 answers
14k views

Cannot install Oracle JDK via apt in Ubuntu 16.04

I created a new Ubuntu 16.04.3 VM and am attempting to install JDK 9. Unfortunately, the latest version of the JDK apt installer, 9.0.1-1~webupd8~0, is failing to download the binaries and I suspect ...
PicoDeGallo's user avatar
191 votes
8 answers
837k views

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 ...
Matteo's user avatar
  • 2,307
10 votes
1 answer
4k views

Can't run Java applications (like logisim) due to "Assistive Technology not found" error

I tried it and the errors are: Exception in thread "main" java.awt.AWTError: Assistive Technology not found: org.GNOME.Accessibility.AtkWrapper at java.desktop/java.awt.Toolkit.newAWTError(Toolkit....
WISERDIVISOR's user avatar
207 votes
1 answer
613k views

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 ...
Dan's user avatar
  • 3,418
4 votes
5 answers
14k views

Installing Java 7 in 16.04 and using multiple Java versions

I already installed Java 8, but I don't know how to install Java 7 and how to switch between the two Java versions. I also want to switch between Java 7 and 8 to update a project I am working on. I ...
Geemo's user avatar
  • 133
181 votes
6 answers
585k views

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 ...
mcExchange's user avatar
  • 3,088
72 votes
2 answers
21k views

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. ...
tudor -Reinstate Monica-'s user avatar
62 votes
2 answers
156k 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 ...
HarlemSquirrel's user avatar
29 votes
5 answers
191k views

How run a .jar file with a double-click?

I have a problem running .jar files by double-clicking them. When I go to the Properties dialogue I can't find Java--only Archive Manager in the list of programs. But java -jar somefile.jar opens the ...
Qafqaz Qafqaz's user avatar
324 votes
12 answers
993k views

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 ...
Thorbjørn Ravn Andersen's user avatar
36 votes
4 answers
73k 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 ...
rubo77's user avatar
  • 32.4k
20 votes
3 answers
37k views

Can't install Oracle Java 8 in Ubuntu 16.04

I haven’t installed anything strange in my Ubuntu 16.04 Server. I did some tests in my Ubuntu 16.04 Desktop VM some hours before and installation was successful, but in my dedicated it seems something ...
Ubuntu Noob's user avatar
19 votes
6 answers
35k views

Unsatisfied Link Error and missing .so files when starting Eclipse

I upgraded to the 12.04 beta yesterday. Now, when I try to start Eclipse, I get the splash screen and then this error message: An error has occurred. See the log file /home/gabriel/.eclipse/org....
Keidax's user avatar
  • 791
46 votes
8 answers
18k views

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 ...
Tim's user avatar
  • 563
39 votes
2 answers
37k views

"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 ...
Fawkes5's user avatar
  • 2,509
4 votes
1 answer
2k views

Java version problem with Eclipse and NetBeans on 18.04

I'm new to Ubuntu, using 18.04 and trying to install Netbeans or Eclipse but neither of them works. At first my java was version 10. Searching for solutions I found many suggestions to install ...
Me.'s user avatar
  • 53
110 votes
7 answers
117k views

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....
Shiwangi Singh's user avatar
71 votes
14 answers
210k views

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 ...
user827992's user avatar
  • 2,851
14 votes
2 answers
60k views

How to run a Java program in Ubuntu

sachin@sachin-Lenovo-G550:~$ java -version java version “1.7.0_21″ OpenJDK Runtime Environment (IcedTea 2.3.9) (7u21-2.3.9-1ubuntu1) OpenJDK Server VM (build 23.7-b01, mixed mode) When I ran the ...
Sachin dua's user avatar
9 votes
3 answers
25k views

How to get Scilab 6.0.1 working on Ubuntu 18.04 LTS?

I have installed clean Ubuntu MATE 18.04 LTS and installed Scilab from repository here with sudo apt-get update sudo apt-get install scilab After installation I tried to launch it from GUI (...
N0rbert's user avatar
  • 99.8k
24 votes
5 answers
91k views

JavaFX missing, Ubuntu 18.04

I have Java 8 and Ubuntu 18.04. I'm using NetBeans and when tried to make some program, it couldn't be done because JavaFX is missing. I installed Java JDK with NetBeans from Oracle's site and ...
maria's user avatar
  • 915
11 votes
3 answers
31k views

How do I install Netbeans 9.0+?

A lot has been changed since the release of Netbeans 9.0. Now Netbeans is taken by Apache Foundation. Also, APT still has v8.1 in Bionic Beaver (18.04). So, how do I install latest version (>9.0)?
Kulfy's user avatar
  • 17.7k
6 votes
3 answers
16k views

Update to latest version of java after ppa is discontinued

I have been trying to install the latest version of java-8. However, I found out that the PPA ppa:webupd8team/java has been discontinued due to changes in the java licence. How should I update my ...
deann's user avatar
  • 183
3 votes
1 answer
4k views

No 'Open with' option to open/run jar file with openjdk

I have run sudo apt-get install openjdk-7-jre It says Reading package lists... Done Building dependency tree Reading state information... Done openjdk-7-jre is already the newest version. ...
Jack McDowell's user avatar
74 votes
6 answers
376k views

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 ...
user199273's user avatar
59 votes
1 answer
165k views

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, ...
pilat's user avatar
  • 693
41 votes
6 answers
209k 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 ...
spences10's user avatar
  • 2,592
18 votes
2 answers
36k views

Changing JVM in Java

I only recently discovered the different JVM's on the wiki page and thought I'd start tinkering. Its been difficult to find documentation on how to configure Java on Ubuntu though. Lets say I wanted ...
OVERTONE's user avatar
  • 2,307
4 votes
3 answers
26k views

Installing Eclipse IDEs for Java and C/C++

I'm running an Ubuntu 14.04 and want to install the Eclipse IDE for both Java and C/C++ programming. I installed the separate installation files from their official website. I followed this thread ...
SY_13's user avatar
  • 486
1 vote
1 answer
792 views

how to install netbeans from umake?

How do I install netbeans from umake? thufir@dur:~$ thufir@dur:~$ umake ide netbeans Choose installation path: /home/thufir/.local/share/umake/ide/netbeans thufir@dur:~$ System info: thufir@...
Thufir's user avatar
  • 4,551
58 votes
4 answers
74k views

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 ...
James McMahon's user avatar
37 votes
3 answers
43k 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?
RolandiXor's user avatar
  • 51.5k
30 votes
3 answers
86k views

How can I install OpenJDK on Ubuntu 16.04? [duplicate]

Since I upgraded to the latest version of Ubuntu, I cannot install the Java OpenJDK package needed to compile Android custom ROMs. When I run sudo apt-get install openjdk-7-jdk, the following error ...
Hakam El Assouad's user avatar
24 votes
1 answer
49k views

java plugin in Chromium

Icedtea-7-plugin installed but it does not appears in the list in about:plugins in Chromium. Not able to execute java applets. Tried installing Icedtea-7-plugin but in vain. Using openjdk7 in 14.04
pulkit's user avatar
  • 321
22 votes
3 answers
69k views

"No such file or directory" when invoking java

I'm trying to re-install Oracle JDK 7 32 bit to 64 bit Ubuntu (previously 64 bit JDK was installed). JDK is currently present at /usr/lib/jvm/jdk1.7.0. I invoke sudo update-alternatives --remove "...
Andrei Botalov's user avatar
20 votes
6 answers
48k views

Is there any web browser with NPAPI plugins support?

As per this article, Mozilla has dropped the support of NPAPI plugins from Mozilla Firefox version 52. Is there any web browser with NPAPI plugin support? I have to use a website frequently, which ...
La Corazón's user avatar
15 votes
4 answers
31k views

Minecraft with OpenJDK 7, I get "the trustAnchors parameter must be non-empty"

Im using Ubuntu 15.04 and OpenJDK 7, trying to run Minecraft. This is what I get. EDIT: Minecraft is working now when I use sudo java -jar Minecraft.jar but doesn't work without super user, how would ...
ashermaster's user avatar
14 votes
9 answers
31k views

Minecraft in jdk 1.7.0_u2 x64

I have Ubuntu 11.10 64-bit and I installed JDK 1.7.0 update 2 x64 via webupd8 page. But currently I have problem with minecraft game. After downloading launcher from Minecraft.net and lauch the game ...
Bambi Bunny's user avatar
14 votes
5 answers
12k views

Will Sun's Java be available from Canonical's partner repository?

I just discovered that Oracle's (Sun's) Java6 has vanished from the Canonical's partner repository. Before Java was taken from all repositories I had purchased Minecraft for play in Ubuntu. After ...
Moma Antero's user avatar

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