Questions tagged [java]

Java is a general-purpose programming language and a computing platform called the Java Virtual Machine (JVM). Use this tag when you are dealing with a java program, installing java, or configuring a java installation.

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43
votes
5answers
32k views

openjdk-8-jre-headless : Depends: ca-certificates-java but it is not going to be installed

Can't install Java8 apt-get install openjdk-8-jre-headless Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean ...
34
votes
4answers
514k views

How to find path where jdk installed?

I've installed jdk1.7.0.rpm package in RHEL6. Where I do find the path to execute my first java program?
25
votes
5answers
42k views

How to trace a java-program?

As a sysadmin I sometimes face situations, where a program behaves abnormally, while not creating errors at all or creating nonsense error-messages. In the past - before java came in - there were two ...
20
votes
3answers
64k views

Java location from /usr/bin/java

I'm trying to find my java location within my Linux system and got this [980@b449 ~]$ which java /usr/bin/java [980@b449 ~]$ readlink -f $(which java) /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/...
19
votes
3answers
22k views

Running unsigned javaws code

For a KVM remote console I need to be able to run a jnlp file. When I run it I get: net.sourceforge.jnlp.LaunchException: Fatal: Initialization Error: Could not initialize application. at net....
17
votes
2answers
23k views

Writing a systemd unit file with a environment-set executable path

I am writing a systemd unit file for a Java application and I'd like to control the version of Java used to start it up. My (simplified) service file is [Service] Type=simple EnvironmentFile=%h/...
16
votes
6answers
135k views

Kill only one Java process

I usually run few Java applications, one for server running locally and other for some IDE like NetBeans. And from time to time, after lots of redeployments, my server get stuck on ...
16
votes
9answers
70k views

Problem to launch java at Debian: “error while loading shared libraries: libjli.so”

I'm trying to launch java: $ java -version java: error while loading shared libraries: libjli.so: cannot open shared object file: No such file or directory $ ldd /usr/lib/jvm/java-6-openjdk/jre/bin/...
15
votes
2answers
2k views

How to fix Java applications mouse pointer offset in Awesome WM?

How to reproduce in Awesome WM v3.5.2 through 3.5.5 (so far): Install OpenJDK or Oracle Java 7. This bug has been observed with both. Start a new Awesome WM session with the default configuration. ...
14
votes
2answers
58k views

How to find where is $JAVA_HOME set? [duplicate]

I'm trying to change the value of $JAVA_HOME & I just can't seem to find in which file is it being set currently. I can't remember where did I set it the last time. Already tried How to determine ...
14
votes
1answer
2k views

Is there any way to tell if a shell script was killed with signal 9

I have a bash script (called from a java program) that keeps getting killed. I always catch the signal 15 with trap but then some other signal comes along that I suspect is signal 9 but am in ...
13
votes
6answers
57k views

Command Line Tool for monitoring Java Heap

Is there any command line tool for monitoring the heap size usage of Java in CentOS?
12
votes
2answers
6k views

Invoke Syscalls from Java

Is there a way to invoke syscalls directly from Java, or is it necessary to first call a native method?
12
votes
1answer
14k views

What is the difference between JAVA_HOME and update-alternatives?

I have been trying to figure out the best way to run OpenJDK Java Runtime as default Java for my Fedora box and use Oracle JDK 6 for Android development namely for running Android SDK Manager, Android ...
10
votes
1answer
14k views

configure java daemon with systemd

I'm using this definition for a systemd job: [Unit] Description=Some job [Service] ExecStart=/usr/local/sbin/somejob User=dlt Type=forking [Install] WantedBy=multi-user.target The script ...
10
votes
1answer
13k views

How to get Oracle java 7 to work with setcap cap_net_bind_service+ep

I am trying to grant the java executable the right to open ports below 1024 on Linux. Here is the setup /home/test/java contains the Oracle Server JRE 7.0.25 CentOS 6.4 Here is what getcap returns ...
10
votes
1answer
11k views

How can i know which unistd.h file is loaded?

I have several unistd.h files in my Ubuntu Linux. I've one on /usr/include/asm/unistd.h. This file has this directives: # ifdef __i386__ # include "unistd_32.h" # else # include "unistd_64.h" # ...
10
votes
2answers
38k views

Adding a folder of jar files to my path

I have java tools that I need to use. The tools are in a folder full of jar files. I wanted to add this folder to my path, for the obvious reasons, but after I edit my .bash_profile to include the new ...
9
votes
2answers
6k views

jetbrains-toolbox loads to a blank screen

For the last month or so, I've been attempting to get jetbrains-toolbox to work. It used to work (and is how I installed IntelliJ IDEA and Gogland.) When I went to update the IDEA I'm currently ...
9
votes
1answer
4k views

update-alternatives just for one user

I'm using a shared server. On that server different versions of Java are installed: Selection Path Priority Status ----------------------------------------...
9
votes
1answer
25k views

Where can I set global Java Options?

I have horrible, improperly-rendered fonts in Java programs such as jabref and rubymine. This can be fixed by running _JAVA_OPTIONS='-Dawt.useSystemAAFontSettings=on' jabref I understand that I ...
9
votes
1answer
5k views

What is the safe way to allow Java 7 to run on SELinux

Short version: What is the most secure way to allow Java 7 to run on (with?) SELinux? Long version: Sorry in advance if I use incorrect terminology. I'm really just a Java developer with a meager ...
8
votes
4answers
49k views

How to set JAVA_HOME correctly on CentOS?

I am trying to set JAVA_HOME so that I can install Apache Solr with the help of this tutorial. I am connected to my server using ssh with root user To allow the running sh script to install Apache ...
8
votes
1answer
343 views

Why was Java 8 left out from Debian Buster?

Recent stable version of Debian, Debian Buster, does not have Java 8 any more. However, Java 8 is still widely used in productive settings, and doing this is a huge fallback before any upgrade. ...
8
votes
4answers
6k views

Set up for Android Studio gets stuck

I was setting up my freshly installed Ubuntu Mate 16.04, when it was time to set up Android Studio 3.0 I came across this: it appears that the setup tries to download from https://dl.google.com/...
8
votes
2answers
15k views

Java JDK missing libjli.so path in dependency list, Debian

I am scripting the creation of chroot jails and part of that automation includes copying various executables and their dependencies into the jail. I am using the following bash line to parse the file ...
8
votes
5answers
9k views

A system-wide way to set or get $JAVA_HOME in Ubuntu?

I wonder whether Ubuntu itself provides a system-wide way to find the current JAVA_HOME or whether there is right place for setting JAVA_HOME. Mac OS X does well in this, for /usr/libexec/java_home ...
8
votes
2answers
2k views

Java process freezes until I use 100% CPU [closed]

The issue I encounter When working on Android-Studio, Eclipse or even command-line Gradle, the Java software often freezes (even though usually it is after I update my system/change java). For ...
7
votes
4answers
56k views

Java “Could not reserve enough space for object heap” even though there is enough RAM

I am currently having some issues running Java. It won't start because of heap issues. But I have more than 9 GB Ram free (or even 16 GB if you assumed the cache would be empty). This is the error I ...
7
votes
2answers
2k views

What is Debian's stance regarding GCJ and OpenJDK?

Both OpenJDK and GCJ are available for install on Debian, and now I wonder what's happening. Don't these provide same functionality?
7
votes
1answer
28k views

How do I download and launch a JNLP file in CentOS?

I'm using Amazon's GPU cluster to experiment with some HPC java code on CentOS. The Java application is in JNLP format and has a GUI. I've followed Amazon's getting started video, but I'm not ...
7
votes
2answers
10k views

Minimal Java installation for Linux with no GUI

I'm working on a CentOS 6.3 x86_64 minimal OS (installed using the netinstall ISO). This system is not expected to run anything beyond console apps/services and Tomcat7. When I attempt to install ...
7
votes
2answers
2k views

Java doesn't show menu text

I startet netbeans/intelliJ/squirrelSQL after I didn't use it for a few days/weeks and now the menu doesn't show text. There are just the underlineds. My system: ArchLinux (everything up to date, ...
7
votes
2answers
8k views

Use certain version of JRE / JDK for certain programs

I use ArchLinux, and an IDE called PyCharm. On its download page, it recommends using Java 6 instead of OpenJDK. ArchLinux has an OpenJDK package (jdk7-openjdk) that I have installed, installed, and ...
7
votes
1answer
2k views

Poorly performing java application vs poorly performing server

This is a very generic question, but it has been coming up more and more often for me. I would like to try and determine an appropriate course of action for this generic case, as I think it could ...
7
votes
2answers
11k views

use different java version to run two programs

I installed two JAVA JREs on my new CentOS since Cassandra needs java7u25 or later while iReport needs to work with 1.6. Now how do I launch each program from command line telling each program which ...
7
votes
1answer
5k views

Is the openjdk-r ppa trustworthy enough to install on server?

We are running ubuntu 14.04, which still does not have openjdk8 yet. And I doubt they are going to fix this very soon. We need jdk8 very badly. Is this openjdk-r ppa safe enough?
7
votes
0answers
404 views

Java programs steal focus in X11

I run IntelliJ IDEA & some other Java GUI apps on my linux box. Every one of them tends to steal focus when launching up, and doing it in stealthy way. E.g.: I run IDEA, it starts up in ...
6
votes
3answers
13k views

What to do to run GUI Java app in chrooted environment?

In my case Java app is JDownloader. I prepared chroot environment as explained here: http://www.0x61.com/forum/post5240333.html#p5240333 and here: http://interreality.org/~reed/java-chroot.html ...
6
votes
4answers
3k views

Is there a JVM daemon?

I'm curious, is there a JVM which runs as an OS daemon, and forks when a new process should be started in it ( i.e. like init, or zygote process on Android )? If no, why not? I am not talking about a ...
6
votes
1answer
50k views

How to completely remove Java 6 and install Java/JDK 7 on Linux Mint 13

How can I completely remove Java 6 and install Java/JDK 7 on Linux Mint 13?
6
votes
1answer
33k views

Installing openjdk-7-jdk does not update java (which is still version 1.6)

I am having issues updating Java. I am running Ubuntu 11.10. I can execute sudo apt-get install openjdk-7-jdk and it completes successfully. javac -version is 1.7, however java -version is 1.6. This ...
6
votes
2answers
44k views

Java code to copy files from one linux machine to another linux machine

I'm looking for java code to copy files to a remote linux system. I have tried Runtime.getRuntime().exec() function by passing an scp command, but each time I run the program it is asking for the ...
6
votes
2answers
2k views

How can I install Sun JDK on a Debian based system?

I can't find any .deb packages for Sun's Java Development Kit. How can I install it on my Debian machine without causing conflicts with the already installed openjdk packages?
6
votes
2answers
1k views

Java problem - nearly looks like a virus?

I have a weird problem since about a week. When I wake up my computer from suspend, a java process starts and consumes about 170 % CPU capacity. I analyzed the java process a bit: it connects to ...
6
votes
4answers
28k views

java plugin does not work in chromium-browser (all possible attempts exhausted)

I was using google chrome browser on Ubuntu 12.04 machine, recently I needed to switch to chromium-browser. I am using the version that is available on the Ubuntu software centre. The problem is that ...
6
votes
3answers
2k views

How can I expose JAVA_HOME to applications running under X and/or Gnome?

I'm trying to run IntelliJ from Gnome3's Applications menu, but it complains the JAVA_HOME variable is not set. I have the Java installation under my home folder. I managed to export the variable in ...
6
votes
2answers
4k views

How do I change file associations from the command line?

The system in question is Solaris, using the Gnome type interface (Java Desktop Environment). We have occasional issues with users managing to mess up their file assocations (most notably .tif). ...
6
votes
1answer
592 views

Installing OpenJDK on a Netbsd Sparc64 Server

I am currently working on a project that involves running the lift framework on a sun sparc64 architecture. Due to limited support from more popular unix distros, I am running NetBSD 64-bit on the ...
5
votes
3answers
12k views

Looking for a Java class in a set of JARs with find, unzip, grep

I was trying to find the JAR containing a Java Class. JARs are in zip format. My first attempt was: $ find -name "*3.0.6.RELEASE.jar" | xargs -l1 unzip -l \ | grep stereotype.Controller ...