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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Sending data from rs232 [duplicate]

I'm trying to write a loopback test with pins 2 and 3 connected. I am using Ubuntu OS and java for the code. The library that I'm working with is JSSC. I am able to read and write from the serial ...
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2k views

Why is Android studio complaining about OpenJDK?

I have latest version of Manjaro 64 bit, latest version of Oracle's JDk and Latest version of Android studio. Everything is up to date on my system. Android studio is complaining about OpenJDK ...
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foolproof way to detect if java process is running

I have a java process that runs continually that sometimes, for reasons I have yet to fully debug, craps out. So, I also have a cron job that looks for the process every 5 minutes and if it finds the ...
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update-alternatives returns error about Java directory not available

I've been trying this tutorial: How To Manually Install Oracle Java on a Debian to install Java on Debian 8, but I'm getting the following error : update-alternatives: error: alternative path /opt/jdk/...
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298 views

Can't test Java installation as normal user

I have installed java and firefox. root@localhost:/home/debian# java -version java version "1.8.0_45" Java(TM) SE Runtime Environment (build 1.8.0_45-b14) Java HotSpot(TM) Server VM (build 25.45-b02, ...
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759 views

How to install openjdk properly?

Something wrong in my openjdk,i purge it and reinstall it. root@localhost:/home/debian# apt-get remove --purge openjdk-7-jre Reading package lists... Done Building dependency tree Reading state ...
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188 views

Issues with Java in Linux

Firstly, I would like to apologize as I'm not quite sure whether this question is suitable to be on this site or Stackoverflow. I chose U&L eventually because the traffic here is much lower ...
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122 views

When I execute a .run file as <user> it works fine. If I sudo run it, it cannot detect Java

I am trying to execute a .run file that will install some applications. I'm installing the application in /opt/... When I run it without sudo, the installer runs correctly but cannot write to /opt/. ...
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843 views

How to remove JDK 7 and install JDK 8 in Linux Mint?

JDK 7 is already installed in Linux Mint by default. I want to remove it and to install JDK 8 instead. I youtubed and i found a tutorial. I followed it. What i did was, first i downloaded JDK from ...
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310 views

how to make special program run with different version of java from system? [duplicate]

My system need to use java 1.7. However, I need to run some old apps which require java1.6. Can I use shell script to let the old apps use correct java version? Could the $JAVA_HOME help? I try to ...
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100 views

Java version is different in GUI and command line

On my Mac I have two different indications of the activated JAVA version $ uname -a Darwin Mr-MBP.lan 14.4.0 Darwin Kernel Version 14.4.0: Thu May 28 11:35:04 PDT 2015; root:xnu-2782.30.5~1/...
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XFCE strange behaviour on Java applications

I recently moved to XFCE 3.12 on my laptop and everything is working great except for a strange behaviour in Eclipse and other Java applications. When expanding a line selection with Shift+Up or Down ...
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OS X Java Security Edit Site List En Masse

I'm sure, like many other systems administrators like myself who use Mac, you've come across the dreaded Java Security site list and the need to add IP's for individual blades, servers and anything ...
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281 views

Java programs not running in terminal

I have java 8 installed on fedora 20. Any java program runs perfectly fine via eclipse but when I run the same program on terminal it reports an error saying 'could not load main class' . what could ...
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89 views

How to switch java environment for specific process?

I use openjdk in my work, but sometimes I need oracle's jre or even specific version of oracle's jre. As I know, I should update JAVA_HOME value and /usr/bin/java or /etc/alternatives/java link ...
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133 views

How to change JAVA_HOME temprorary with env command

I use openjdk for my work, but sometimes I need oracle's JRE. I thought that I could use 'env' command for this, but can't figure out why it's not working. I have openjdk in /usr/lib/jvm/java-1.8.0-...
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1answer
142 views

How to copy a installed library to a remote Linux host

I am a newbie on Linux and trying to host my Java project on a remote linux host(CentOS). My Project depends on some native libraries that needs to be existing in the host, and since it is a shared ...
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60 views

JAR file terminates unexpectedly without error

I have a JAR file that I'm running in a screen session using java -jar <myjarfile> and for some reason it stops running at unexpected times. I'm redirecting both the StdErr and StdOut to ...
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Tomcat won't use setenv.sh

I have Tomcat installed as service. It's CATALINA_HOME and CATALINA_BASE are same: -Dcatalina.base=/usr/share/tomcat7 -Dcatalina.home=/usr/share/tomcat7 I added setenv.sh script to /usr/share/...
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installing java on cent os 6.6 64 bit system

am trying to follow this link: How to Install JAVA 7 (JDK 7u79) on CentOS/RHEL 7/6/5 and Fedora So I downloaded the jdk tar and untarred it.However when I run java -version from within bin I get the ...
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175 views

Block outgoing connection from running process

I have an java application that I have been developing. I use a external db server that I can't control. I want to simulate connection error to it, but I'm unable to do it. I have tried to use ...
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104 views

What makes a program Linux compatible/incompatible?

I understand that Linux does not support .exe's, but is adding Linux support as simple as providing a .jar version? This summer I'm going to try to really start programming and contributing to... well ...
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Is it possible to create aliases that affect services starting?

Currently I have a custom service that executes java in multiple places. I want to be able to add an option to any executions of java this service will spawn (I'm specifying the error log location, ...
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275 views

Open Java programs of a linux machine on Windows with SSH?

I usually use laptop (which has Windows) to ssh to my Linux server and run stuff on it (e.g. Intellij, MATLAB). I wonder if there anyway to open Java programs (again, like Intellij) of a remote ...
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Debian Packaging with JavaSwing?

On my Ubuntu 14.04 machine I am developing a java swing application and I'm compiling it with oracle java version "1.7.0_80" In the myapp-1.0.0/DEBIAN/control file I put the following information: ...
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Help with java on Fedora

I have installed java on my fedora, because when I execute java -version I get: openjdk version "1.8.0_25" OpenJDK Runtime Environment (build 1.8.0_25-b18) OpenJDK 64-Bit Server VM (build 25.25-b02, ...
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60 views

How to know if I correctly installed Java?

I am very new to Linux as I just installed it on my HP Chromebook (Xfce). I am trying to get OpenJDK 7 on it. When I use the Software Center to install it, it looks like it installed correctly, but ...
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230 views

JRE failed even after open jdk as well as oracle … using ubuntu14.04

$ sudo update-alternatives --config java There are 2 choices for the alternative java (providing /usr/bin/java). Selection Path Priority Status 0 ...
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271 views

Centos 7 - where is jfx library for openjdk8?

I have centos 7.1. And I installed openjdk8 and openjdk-devel8. However, when I tried to compile in netbeans my jfx application I get package javafx.* does not exist. After some investigation I see ...
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5k 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/...
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after reboot server, service start without special chars

I write simple Java server. This service (java server) connect with mySQL database. I am connecting with this service by socket connection. Everything work well when i start my service by line ...
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192 views

Can't push git updates & run Unix commands when connecting via SSH

I have installed java 8 on my bluehost VPS. I have followed http://tecadmin.net/install-java-8-on-centos-rhel-and-fedora/ instructions . In order to add directories to PATH variable I have added ...
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1answer
76 views

Is it Possible to globally set the java hs_err log Location?

I know when executing a jar using the command line option -XX:ErrorFile=[location] allows you to change where the hs_err log files are placed. I am wondering: is there is a place I can globally ...
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223 views

/usr/java/jre1.8.0_31/bin/java.exe: No such file or directory

I've been trying to run a plugin inside a I have hired, and I've constantly been getting this error: [04:13:41] /bin/sh: /usr/java/jre1.8.0_31/bin/java.exe: No such file or directory Not too sure ...
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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 ...
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139 views

sqldeveloper can't start

When starting sqldeveloper it crashes without any warning. It just shows a window for a fraction of second. By debuging : $ bash -vx /opt/sqldeveloper/sqldeveloper/bin/sqldeveloper it gives this ...
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102 views

What happens to TCP when a write fails to enqueue with the device tx ring?

Lets say the device tx ring is full and you do a normal C non blocking write(fd, buff) to enqueue data in the TCP SND buffer. What happens when this fails? In UDP - the packet would be dropped but ...
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1answer
2k views

How to setup DISPLAY to run a Java JAR Swing Executable from Init.d

I need to run a Java JAR Swing GUI executable in a Raspbian Wheezy Debian distribution inside an ARM device during boot time. I am following this as reference with myapp,myapp-start.sh and myapp-stop....
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1answer
123 views

Question on environmental variable

I have Oracle jdk7 installed on my centos6. I noticed that the /etc/profile has the lines below: #below lines are added for Java export JAVA_HOME="/usr/java/latest" ## export JAVA_HOME JDK ## export ...
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75 views

Java JRE 6 installation

I installed Java 6 (jre-6u45-linux-x64.bin) on a Ubuntu 12.04 machine following the procedure from this link: http://ubuntuforums.org/showthread.php?t=1904467. When I later installed Java 7 and ...
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370 views

crontab is launching multiple java process every 5 minutes?

I have a java runnable jar which I need to run it if it not running or got killed for some reason so I decided to use crontab for this - I need to run the crontab as "poppetapp" user so I am logged ...
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73 views

JVM low-memory tuning

What command-line options would provide the lowest memory-footprint JVM, in OpenJDK, or possibly other JVMs (Linux/Debian)? I'm willing to disable JIT, live with slow or choppy garbage collection, ...
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308 views

JRE version on solaris + Invalid argument when runing JRE java

I located the Jre1.6 in my Solaris machine under /tmp in order to use the Jre version pwd /tmp ls -ltr jre1.6 total 512 -r--r--r-- 1 root root 917 Oct 3 2011 Welcome.html -r--r--...
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742 views

Cannot start Tomcat 7 as Apache Commons Daemon

I've been following the install process as recommended here. I'm trying to run Tomcat as a Unix daemon as described in the docs. However, when I run $CATALINA_HOME/bin/jsvc like this (note, I added ...
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50 views

Why does gstreamer-ffmpeg change the fonts for java applications?

I recently installed gstreamer-ffmpeg-0.10.i686 on RHEL 7. As a result of this text in my java program has become slightly larger (maybe 2 or 3 font sizes), which is enough to mess with some of the UI ...
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303 views

Limit max thread use for multithreaded java app

I have downloaded a .jar file and am using java with it, and it seems multithreaded, which is great ... unless I don't want it to be multithreaded, or unless I want to use only N threads with it. Is ...
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File not read by Java until touched

We had a freak incident on Solaris. Our java program couldn't read a file until we touched the file. It was reading other files just fine, it just seemed to be completely blind to this one particular ...
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921 views

Java does not run with error “No such file or directory”, despite it exists and is x86_64

The file exists but bash complains it doesn't when asked to execute it. $ ./Libs/openjdk-1.8.0_60-eap/bin/java bash: ./Libs/openjdk-1.8.0_60-eap/bin/java: No such file or directory $ ls -l ./Libs/...
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92 views

How do I synchronize 2 xml files?

I have 2 xml files named 1k.xml and 1n.xml. The file 1k.xml contains some additional elements and data which are not there in 1n.xml. I want to copy whatever is absent in 1n.xml to it, so that both ...
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Increasing `ulimit -u` settings temporarily in OSX Yosemite

I'm trying to temporarily (without restarting the machine, just for test that starts a JVM) increase the number of processes to 2048 in OSX Yosemite but I'm unable to do so. First, I tried calling ...