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.
382
questions
49
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10
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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 ...
- 57.1k
48
votes
9
answers
114k
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'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 "...
- 481
47
votes
8
answers
332k
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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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42
votes
5
answers
95k
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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 ...
- 1,707
28
votes
4
answers
95k
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Installing Java 7 Update 25 on 12.04 LTS?
How can I install Java on Ubuntu 12.04?
I have:
Java(TM) SE Runtime Environment (build 1.7.0_21-b11)
Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)
- 281
27
votes
5
answers
70k
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17.10 openjdk and oracle jdk 8 and 9 the trustAnchors parameter must be non-empty
I've just installed 17.10 in a fresh VM. Trying to set up a development environment, when I run gradle or ./gradlew I get the following error:
* What went wrong:
Error resolving plugin [id: 'com....
- 469
27
votes
1
answer
70k
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OpenJDK - Oracle is better? [closed]
From http://www.wikihow.com/Install-Oracle-Java-on-Ubuntu-Linux
Type/Copy/Paste: java -version . If you're having
OpenJDK Runtime Environment (IcedTea6 1.10pre) (7b15~pre1-0lucid1)
OpenJDK 64-Bit ...
- 1,470
26
votes
3
answers
42k
views
Eclipse (ADT) crash Failed to write core dump. Core dumps have been disabled
i found my problem here:
how to fix “Failed to write core dump. Core dumps have been disabled” error while running java
and
here:
Eclipse crashing on startup
and here:
Eclipse continue crash
Nothing ...
- 873
26
votes
2
answers
45k
views
Install AdoptOpenJDK / Adoptium onto Ubuntu
I downloaded Java 11 in the form of OpenJDK from AdoptOpenJDK. From the tar.gz file I can extract a folder named jdk-11.0.3+7 with nested folders for bin, conf, lib, and so on. But no installer app ...
- 639
20
votes
2
answers
30k
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How to tell if a certain package exists in the apt repos? [duplicate]
I am specifically interested in determining whether a 32-bit version of OpenJDK 8 exists in the apt/Ubuntu repos.
According to this answer, you can install the 32-bit version of the Open JDK 7 ...
- 315
20
votes
3
answers
33k
views
How can I select which Java to use?
I have installed both OpenJDK 6 and 7. When I run "java somefile" from the command line, OpenJDK 6 is invoked. I do not want to change this default behavior. What command can I use to run my non-...
- 343
19
votes
3
answers
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libawt_xawt.so: libXext.so.6: cannot open shared object file: No such file or directory
Exception in thread "main" java.lang.UnsatisfiedLinkError: /usr/lib/java/jdk1.8.0_60/jre/lib/i386/libawt_xawt.so: libXext.so.6: cannot open shared object file: No such file or directory
at java....
- 471
17
votes
4
answers
96k
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How can I enable Java in Chromium? [duplicate]
I've got Java working on Firefox in Ubuntu 11.04 (Natty Narwhal), but using the same page on Chromium tells me Java cannot be found.
How can I enable Java on Chromium in my Ubuntu 11.04?
- 185
16
votes
2
answers
24k
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How do I install Groovy in Ubuntu? [duplicate]
I don't know how to install files to Ubuntu. Kindly explain to me how to install Groovy.
- 3,890
16
votes
1
answer
10k
views
Ugly/Non Anti-Aliased fonts in Java-Swing Applications
I've recently switched to Ubuntu and I've installed Oracle's Java JDK 8u45 (32 bit) using the webupd8team/java repository.
Everything seems to be working fine except that the Java-Swing applications ...
- 881
15
votes
2
answers
3k
views
Why isn't Oracle Java included in the standard Ubuntu repo?
Unlike many popular programming languages, the popular Oracle Java package is only available using a PPA, not by the official repo.
Why isn't Oracle Java included in the standard Ubuntu repo?
- 12.5k
14
votes
3
answers
62k
views
Can I install a 32-bit Java in addition to a 64-bit version?
For normal development I'm using the 64-bit VM which comes when I install the Java development kit (OpenJDK) with the package manager.
But there are some Java applications (containing native ...
- 789
12
votes
2
answers
67k
views
JVM errors when running minecraft
This is the output I am getting when I am playing minecraft.
Java HotSpot(TM) Server VM warning:
Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future ...
- 121
11
votes
1
answer
25k
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Install Java Plugin in Pale Moon Browser
Pale Moon seems to continue supporting NPAPI plugins like Java indefinitely. I use a website, which require java plugin enabled. But I can't get the java plugin in the plugins list. I know the ...
- 743
10
votes
7
answers
34k
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Running Java/Minecraft with the Nvidia GPU
I have ripped the web up trying to figure this out. Bumblebee hasn't helped. I want to run Minecraft on the Nvidia GPU in my laptop. As far as I can tell, Ubuntu default runs it with Intel because ...
10
votes
3
answers
91k
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How do we install Java in Wine?
I have a Windows file.exe and I need Wine and Java to open it. I don't know how to install Java in Wine. When I try to open Java setup it says
Wrapper.CreateFile failed with error 32: Sharing ...
- 101
10
votes
1
answer
6k
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Ubuntu 17.10 Java 8 Certificate Error
I have a fresh install of Ubuntu 17.10, on which I installed the package oracle-java8-installer (from PPA).
But when I try to compile an ionic project using "ionic cordova build android", it throws ...
- 103
9
votes
2
answers
15k
views
Problem with Java while trying to run pycharm-community-4.5
I've just installed pycharm-community-4.5 into my Ubuntu 14.04 (64 bit). After installing I ran the command /opt/pycharm-community-4.5/bin$ ./pycharm.sh to run pycharm but the terminal showed me some ...
9
votes
4
answers
38k
views
How to install JDK8 on Ubuntu 16?
I needed JDK 8 for Bazel. I ran sudo apt-get install openjdk-8* on a freshly built Ubuntu 16.04.02 machine, but after installation update-alternatives --config java show two paths:
/usr/lib/jvm/java-...
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8
votes
1
answer
6k
views
How to prevent openjdk-6-jre-headless from clobbering Oracle JDK installation?
My automated build server runs a job that depends on Apache Ant. The script invokes apt-get install ant. Ant depends on openjdk-6-jre-headless which runs update-alternatives making itself the default ...
- 1,295
8
votes
5
answers
13k
views
OpenJDK-8/Oracle JDK 8 Font Patches for Ubuntu
Is there a patched version of OpenJDK-8 or Oracle JDK 8 for Ubuntu 14.10 which fixes ugly fonts in Java Applications (Jetbrains products, Netbeans etc.)?
I had previously installed a patched version ...
- 1,656
8
votes
1
answer
8k
views
How to "install" multiple Java versions?
How do you have multiple Java versions in Ubuntu 18.04 LTS?
In my Windows, I usually have 3 versions available for development. I do not have them installed in my system but rather, I can switch to ...
user909427
8
votes
9
answers
56k
views
IcedTea-8 cannot run any jnlp application (maybe due to openjdk-11?)
I'm on Ubuntu MATE 18.04. All the jnlp applications I tried give execution error. After inspection, some libraries seem to be missing in Java.
So I removed everything, started installation again, and ...
- 557
8
votes
3
answers
950
views
Is there a way to use JAVA on Ubuntu after FF stopped NPAPI support?
Mozilla announced that NPAPI will not be supported since the released version 52. This means that Java will not be supported either.
Chromium based browsers do not support java for some time already.
...
- 90.1k
7
votes
2
answers
15k
views
What's the difference between OpenJDK and Sun Java for the end user? [closed]
For users running Java application or applets in the browser, what difference does it make running either Sun Java or OpenJDK?
EDIT
Oracle will be retiring the DLJ, and basing the proprietary ...
- 17.9k
7
votes
5
answers
22k
views
C, C++ and Java IDE for Ubuntu [duplicate]
Is there an IDE which can run on Ubuntu that supports C, C++ and Java? I installed NetBeans, but it only supported Java. I installed the C/C++ package manually, but that package gives an error if I ...
- 130
7
votes
6
answers
12k
views
What editor is as good as TextPad for compiling and running Java programs? [duplicate]
I want an editor that is as good as TextPad (for Windows) for compiling and running Java programs on Ubuntu 12.04. Please suggest one.
- 6,789
7
votes
1
answer
27k
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Ubuntu - saying your security settings have blocked an application from running with an out-of-date version of java
I have this new problem since 2014 begin. I cant remotely login to this enterprise network
for giving them support. Its keep showing this new error.
How to fix it please?
EDIT:
user25165
7
votes
4
answers
6k
views
Unable to install LanguageTool 2.5 extension for LibreOffice 4.2 on Ubuntu 14.04
I am not able to install LanguageTool extension for LibreOffice. Getting exception when I try to install it.
p.s. Somebody says that the solution is installing openoffice.org-java-common package but ...
- 785
7
votes
3
answers
12k
views
"MOZILLA_FIVE_HOME not set" Zekr Qur'an study software java error
I installed Zekr Qur'an study software on Ubuntu 12.04 and I upgraded to 12.10. Then the Zekr app started giving me this error whenever I start it.
org.eclipse.swt.SWTError: No more handles [Unknown ...
- 469
6
votes
2
answers
2k
views
is OpenJDK Vulnerable to 0-Day Exploit?
I was curious to know if OpenJDK is also vulnerable to the Zero-Day Exploit that is currently afflicting Java 7 because of which experts are telling people to disable Java until a solution is found on ...
6
votes
4
answers
16k
views
Not all TTF fonts visible from the (Sun) JDK
I wanted to use Monaco.ttf with IntelliJ. Unfortunately it doesn't show up.
I also noticed that the Monaco font doesn't appear in the list of fonts got from awt:
java.awt.GraphicsEnvironment....
- 3,189
6
votes
3
answers
4k
views
How to revert back to OpenJDK?
I had installed sun-java, but I want to revert back to OpenJDK 7. I was trying to re-install from the terminal using the command sudo apt-get install openjdk-7-jre, same from Synaptic and Software ...
- 61
6
votes
1
answer
8k
views
Install java Runtime Environment
When running the --help switch, I got this.
$ /usr/lib/libreoffice/program/swriter
javaldx: Could not find a Java Runtime Environment!
Please ensure that a JVM and the package libreoffice-java-common
...
- 3,127
5
votes
1
answer
3k
views
How to run firefox and firefox ESR simultaneously
The main reason I want to use firefox ESR is to use a proprietary database tool for work that only allows oracle-java based web logins for linux (or a windows only thin client). I also want to use the ...
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5
votes
4
answers
13k
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exec: 2508: /tmp/install.dir.30906/Linux/resource/jre/bin/java: not found
After running:
sudo add-apt-repository ppa:ferramroberto/java
sudo apt-get update
sudo apt-get install sun-java6-jre sun-java6-plugin sun-java6-fonts
I try to setup a software sybase sudo ./setup....
- 227
5
votes
1
answer
1k
views
Is there a way to specify a global look and feel for swing apps?
Every time I install Netbeans on Ubuntu, I have to edit the ./etc/netbeans.conf file to include an option specifying the look and feel; otherwise, the menus are all black on dark gray, which is ...
- 3,356
4
votes
1
answer
2k
views
Java installation error using apt-cacher
I'm getting this output when I trey to update/install oracle-java7 or from webupd8 ppa:
Downloading Oracle Java 7...
--2014-11-19 16:35:02-- http://download.oracle.com/otn-pub/java/jdk/7u72-b14/jdk-...
- 101
4
votes
3
answers
23k
views
Cannot start Webex session. Java permission issue?
My fingers got ahead of me today and I managed to disable Java for Webex on my machine.
(Install details: Ubuntu 12.04 32bit, Chrome 32.0.1700.77, Java v7, update 51, Webex working fine for a year ...
- 101
4
votes
4
answers
23k
views
How to install JDK and Netbeans?
I have downloaded a .bin file for JDK and am trying to install it. I have used these commands:
chmod +x jdk-6u23-linux-i586.bin
sudo ./jdk-6u23-linux-i586.bin
and got this output:
sudo: ./jdk-6u23-...
- 51
4
votes
6
answers
38k
views
Can't Execute jar files
I'm having trouble opening jar files because there is no java runtime in open with listed. Even I have installed it via Software Center(i also try to reinstall it via synaptic and i do a --purge via ...
- 185
4
votes
4
answers
15k
views
Do I have log4j on my Ubuntu 18.04.6?
I'm obviously worried about this vulnerability, but I wonder if I even have this library on my machine?
The machine is a webserver running a couple of node expressjs frameworks over nginx, plus a ...
- 203
4
votes
2
answers
13k
views
Replacing the OpenJDK with the Oracle JDK
I've had the archive file for Oracle's JDK for some time and have been running java applications through ~/Downloads/jdk1.7.0/bin/java -jar <jarfile> for some time, but I'm wondering if there's ...
4
votes
1
answer
18k
views
how fix mistake made with update-alternatives?
In the process of installing OpenJDK 11 (via a download), and attempting to set the environment variable and defaults to invoke this version instead of the previously installed Java 10, I have messed ...
- 235
4
votes
4
answers
25k
views
Netbeans 7.0.1 installed but won't run
I installed Netbeans 7.0.1, and I've made sure to install all the JDKs and JREs I could find. It installed without errors. I also saw this question and made sure I followed all the instructions there ...
- 6,849