Java is a general-purpose programming language and a computing platform called the Java Virtual Machine (JVM).

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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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7 views

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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1answer
23 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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1answer
16 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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1answer
18 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 ...
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1answer
26 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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1answer
13 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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0answers
17 views

can't start tomcat6(yum) org/apache/catalina/startup/Bootstrap (Unsupported major.minor version 49.0)

i installed tomcat6 on centos6 through yum, when i start tomcat6 (service tomcat6 start), it shows [OK] but, when i stop tomcat6 (service tomcat6 stop), it shows [failed], and i found exception in ...
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1answer
52 views

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 ...
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22 views

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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1answer
25 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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22 views

Java 1.6 -> 1.7 JNLP = SIGSEGV

When i try to run JNLP in Red Hat Enterprise Linux Server release 6.4 (Santiago) app from Java 1.6(1.6.0_36 ) i get: > [wojtek@rcmtex05 ~]$ strace -e open > ...
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1answer
46 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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0answers
15 views

Remove or decrease JAVA Security openjdk AWS centos instance

How to decrease or remove java security level in CentOS openjdk? I tried removing the java security level but I didn't find any option, my OS is in an ec2 aws machine.
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0answers
25 views

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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1answer
65 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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1answer
20 views

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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22 views

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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1answer
32 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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1answer
44 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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30 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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1answer
331 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 ...
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24 views

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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1answer
72 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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20 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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2answers
110 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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21 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 ...
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1answer
53 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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1answer
26 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
161 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 ...
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33 views

What font settings would Java Applications Use without Fontconfig?

I have a java application that looks fine without fontconfig installed, however, I need fontconfig as a dependency for a package, and when I install it my java app's fonts change drastically. My goal ...
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1answer
59 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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23 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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3answers
135 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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42 views

Start a ssh when I click on a JSP button

I have a JSP page, which has a button. I want to start a ssh to the linux server whenever someone clicks that button. Will I be able to see the terminal inside the browser? How can I do this?
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0answers
34 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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1answer
72 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 ...
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1answer
204 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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1answer
27 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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1answer
83 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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0answers
46 views

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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2answers
294 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 ...
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1answer
41 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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1answer
529 views

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 ...
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1answer
33 views

Which way is safer to read data from /sys

I am attempting to write a program that will monitor the temperature of various hardware components. The language I chose for it is Java. Now there are two ways I could read the temperatures: a) Do ...
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54 views

Syntastic, Vim & Android: get them play well together

I've got a problem configuring my development environment for android. I'm migrating away from Android Studio due to continious issues that I have no desire to solve anymore. I'm a long-time VIM ...
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396 views

Java application freezes until I use 100% CPU

The issue I encounter When working on Android-Studio or even Eclipse, the software often freezes (even though usually it is after I update my system). If I move to another desktop and come back, then ...
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2answers
164 views

Run GUI Java jar on system boot Lubuntu

I have a PC which runs Lubuntu 14.10 without a monitor. The user is autologged in. I have created a Sysvinit script and installed it on /etc/init.d. My script amongst other things, starts a jar file ...
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28 views

when idle tomcat runs on 3.9% CPU

I would like to know if it is normal that tomcat7 runs on 3.9% CPU when idle? I saw all other processes are at 0%, only tomcat7 is always at least 3.9%. Thanks
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1answer
31 views

Java in Gnu/linux servers

What is the use of installing java in linux server. I have seen initialising java paths in .bashrc and using them in different scripts. What does this all mean.please help. Dont have much knowledge ...