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

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584 views

Hugepages in linux - how to make sure that java process will start using hugepages

I'm running java server on Red Hat Enterprise Linux Server release 5.9. Recently I started to use HugePages as it has some advantages I would like to use. System was configured correctly (as many ...
5
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1answer
2k 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 ...
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2answers
4k views

install java sdk 6, wheezy

Followed debian Java Sun wiki, and later 1[open jsk 7 ]2 which has a note on installing 6 : link to java 7 on debian aptitude install sun-java6-jdk No candidate version found for ...
3
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2answers
141 views

How to make apt recognize an installed tar package?

I've installed Oracle Java. I want to be able to remove OpenJDK, but when trying to do so apt wants to install another version of Java. How can I configure apt so that it knows I already have a ...
7
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1answer
2k 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 ...
2
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1answer
143 views

Autocomplete doesn't work for file parameters to jarsigner

I'm using Lubuntu 12.10. Assume I've got a file called test.apk in my current folder. 1.) In LXTerminal/bash if I type, adb install t<TAB> the terminal autocompletes it correctly to ...
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2answers
420 views

Problem downloading Java JDK with WGET on Ubuntu

I'm attempting to install the Java JDK through the command line using WGET on ubuntu (no desktop). Here is the picture I took. The file that was downloaded was not the tar ball of the JDK: How can I ...
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0answers
220 views

Jitsi crashes sound every time

No matter which version of the software I download and install from jitsi.org, running Jitsi causes the sound on my OpenSUSE 12.3 machine to be replaced by a low hissing noise. This persists even if I ...
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2answers
4k views

Find the process id of a java application in a bash script (to see if the target application is already running)

I know there are a million questions on getting the process ID, but this one seems to be unique. Google has not given me the answer, so I hope stackexhange will help rather than close this question. ...
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1answer
170 views

Init script partially launches java app

I have a java application that I manage to execute by hand. The application normally opens several ports for local communications (7180 => 7183). Port 7182 serves as a web console and allows me to ...
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0answers
47 views

High Availability of Services

I want to monitor a couple of services in linux. In case they go down I want to restart them. I'm writing a crontab which will get the name of the services using jps command every 60 seconds, and if ...
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2answers
113 views

TCLBLEND FAILURE - Centos 6.4

I have been trying to use a home grown test tool and after doing an update to Centos 6.4, I am no longer able to run the tcl based tool. I am getting the following error and I have no internet access ...
2
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1answer
61 views

Can connect from RPi to laptop, but not other way around

I'm developing a server-client application (command-line based) in Java. I want to run it on my Raspberry Pi (RPi), but it turns out I can't login to my server-part from my laptop. The problem is that ...
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0answers
219 views

X high CPU when using Java applications

Only recently, my Freemind program has become extremely sluggish and unresponsive (big lag) when moving my mind map around. I use Arch Linux with xfce4. Freemind is made with Java. If I move the mind ...
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1answer
2k views

Alternatives not working well for Java installation on Centos 6.4

I am trying to installing on Centos java from Oracle. Following are my steps. yum install /usr/local/jdk-7u3-linux-x64.rpm alternatives --install /usr/bin/java java /usr/java/latest/jre/bin/java ...
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1answer
266 views

Red5 can't find JAVA_HOME

I'm setting up a Red5 server on Cygwin I get this /usr/share/red5$ sh red5.sh Running on CYGWIN_NT-6.1-WOW64 Unable to locate Java. Please set JAVA_HOME environment variable. However, I can also ...
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1answer
1k views

Java installation having issues on Centos java and javac showing different version

I have this package of java jdk-7u3-linux-x64.rpm. So I have been doing this normally yum install jdk-7u3-linux-x64.rpm. Then immediately I will do this alternatives --install /usr/bin/java java ...
2
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2answers
494 views

Search class names in jars

I'm using this command to search *.jar files for java classes, and I only get the name of the jars that contain those classes: grep -ral --include=*.jar SignonEJB . How can I also get the class ...
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1answer
351 views

Java application locks up after playing sound

Our Java application plays short notification sounds periodically (in response to user actions). On some hardward, our application will lock up after the 3rd or 4th short sound. We have to pkill java ...
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1answer
1k views

Can't load IA 32-bit .so on a IA 32-bit platform

I'm trying to install an 32_bit_application on CentOS (64-bit), while running the setup.bin file it return the following error Invocation of this Java Application has caused an ...
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votes
1answer
68 views

Novice Ubuntu 12.04 user needs help! [closed]

I'm new to Unix/Linux and someone suggested I try Ubuntu. I like it but I can't figure a couple of things out and don't really have time to google up ways to solve the problem. Answers from a quick ...
2
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4answers
107 views

any feature on linux like Perfermance Counter on Windows servers?

I have a tomcat web application, when invoking an unstable remote API, I want to get realtime http request time at any time. On windows server, I can use Performance Counter, does centos provide ...
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3answers
1k views

Uniquely identifying java processes with same name

I have two java processes which run using the same file name, MyApp.jar (for example). /usr/java/latest/bin/java -jar MyApp.jar These jars exist in different places and use different ...
2
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3answers
958 views

Linux / JVM - OutOfMemoryError: unable to create new native thread

I have a memory problem with a Linux server (CentOS). It is a VM. Below is the context. It has 70Gb of RAM. There are 2 tomcat running on it. One tomcat is given a heap of 13Gb and the other one a ...
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0answers
93 views

Prevent Java to escalate CPU usage on Slackware64?

I use Slackware64-current on my work laptop and though I love running Slackware, sometimes it hangs on me near to the point of starting considering falling back to Windows. I develop on Java and use ...
2
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1answer
1k 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 ...
3
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0answers
123 views

RES memory more than initial and maximum memory for java

We have a java application running on Centos 6.4 what we notice is that the RES is around 370m which is more then the allocated max that is 256m. Does this signify that we the application is leaking? ...
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0answers
164 views

Ant error after installing NetBeans 7.3 in Lubuntu

I have NetBeans 7.01 from Debian repository - all works. But I have a problem with NetBeans 7.3 from the official site (installed on the same machine) - I can't compile anything: ERROR - Ant is ...
2
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2answers
157 views

Do I need to remove all “java|jre” packages from my system to be secure from java vulnerabilities?

Currently I have these installed on my Scientific Linux 6.3: [root@localhost ~]# rpm -qa | egrep -i 'java|jre' java-1.7.0-openjdk-1.7.0.9-2.3.7.1.el6_3.x86_64 ...
4
votes
3answers
10k 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 ...
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1answer
161 views

Point IP to an application instance

I was just wondering how I go about pointing a static IP address which I have purchased to an application instance on my server, using a different IP from the one I currently have pointing to my main ...
2
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1answer
599 views

IBM Java Runtime Environment on CentOS

I need to install IBM's JRE, but I can't seem to find an appropriate download or guide to installing it on CentOS. I've found various zips, but none of them include an RPM and I have no idea where to ...
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1answer
8k views

Missing 32 bit library on a 64 bit Linux install

I am trying to figure out why Eclipse is complaining about being unable to find a library. I've managed to reproduce/reduce the java problem to: $ ldd ...
3
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1answer
900 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 ...
3
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1answer
2k views

Cannot kill a java process

I have a java process that cannot be killed. I have tried every method I know, or that I have found on the internet to no avail. I have tried: killall java kill -9 <pid> kill -11 <pid> ...
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4answers
10k views

Java update on Centos

I have a Centos 6.2 machine. It currently has JDK 1.6.0_26 installed. I would like to update that to 1.6.0_38, the current release version. I saw a comment somewhere about sudo apt-get; apt-get does ...
3
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2answers
848 views

What is meant by stack in connection to a process?

From the book Advanced programming in the Unix environment I read the following line regarding threads in Unix like systems All the threads within a process share the same address space, file ...
3
votes
4answers
12k views

Installing JDK 7 on debian

So I just rented a dedicated server running Debian, and I know nothing about Linux. Anyway, I want to install the JDK 7, first I connected through SSH and granted myself administrator rights by ...
2
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0answers
450 views

Java uses max 8 cores on Debian, even though 16 are available [closed]

I have two servers at hand, both with 16 cores. The first is running Debian, the second running Ubuntu. I have written a small multithreaded java app that creates 16 threads. On the Debian machine, ...
0
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0answers
627 views

Java SWT App: Need 64-bit swt.jar

I have a Java app that I want to run in Ubuntu, but I have Java 64 so I can't run it because it only has the 32-bit swt.jar. I can't build it myself, so Is there anyone that can provide the 64-bit ...
1
vote
1answer
173 views

Visually-transparent & Input-transparent Windows

I'm a Java programmer who's rather new to Linux. I'm on Suse / Gnome and I need to create a window which: Is visually translucent/transparent. This is the usual alpha blending that composes a ...
10
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3answers
6k 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 ...
3
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0answers
186 views

Implement Java/JavaFX on ARM

I am working on ARM Linux. I have found this link that says that JavaFX could work on ARM. I am confused about Embedded Java SE and JavaFx ARM. Do I need to setup a JVM for those or not? I have ...
5
votes
1answer
3k 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 ...
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1answer
350 views

How to start java application after machine reboot?

I'm wondering if there is easier way to start java application (just tomcat server) after machine has been rebooted? Possible answers: Add the application as a service and then add it using ...
1
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2answers
2k views

Java version for Tomcat

I want to run my Tomcat with Java 7 but all I found about configuring it doesn't work. The management interface of Tomcat shows 1.6.0_24-b24 as Java version. The JAVA_HOME variable is empty. % echo ...
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1answer
1k views

Using NetBeans on ARM Linux?

Is it possible to run NetBeans on a ARM CPU with Linux as OS (maybe Debian) ? I want to be clear I don't need to compile for ARM (I will use NetBeans only for PHP coding). So the question is about ...
1
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1answer
181 views

CentOS5, RHEL5, Java dependent Packages, Alternate JVM/JDK

Specifically regarding Java dependent packages, such as ant. Is it possible to install them via rpm, when using an alternate JVM/JDK? For example, If I install the Oracle JDK, can I use an ant ...
2
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1answer
407 views

Problem with java3d

I want to play this java simulation: http://www.compadre.org/OSP/items/detail.cfm?ID=9640 in java 3d mode on a linux (ubuntu) system. But it doesn't work. If I switch to java 3d-mode it complains ...
2
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1answer
1k views

Installing jdk7 on Debian server via SSH

Currently, I'm trying to launch a java program on a server. The server is launched on my virtual machine (VirtualBox) and controlled over SSH. Its OS is Debian. So, in order to launch my program I ...