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Questions tagged [java]

Programming language and runtime environment that allows compiled Java programs to run unchanged on most hardware and software platforms

1817 questions
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8 answers

How to change default /tmp to /home/user/tmp

Is there an environment variable to set the temporary directory on debian based systems? I have a java applet that uses that environement variable and it's getting confused when launching two instances of the same applet.
Disco
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4 answers

Linux `alternatives --config` without user input

I am writing a RHEL kickstart script, and in my %post, I need to install a JRE. Basically, the current setup involves me needing to manually go in after first boot and set the newly installed JRE as the default using the alternatives --config…
snk
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2 answers

Adding lines to /etc/profile with puppet?

I use puppet to install a current JDK and tomcat. package { [ "openjdk-6-jdk", "openjdk-6-doc", "openjdk-6-jre", "tomcat6", "tomcat6-admin", "tomcat6-common", "tomcat6-docs", "tomcat6-user" ]: ensure => present, } Now I'd like…
miku
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16
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3 answers

Unable to change vm.max_map_count for elasticsearch

Prehistory I have elasticsearch and SugarCRM7 running on CentOS 6.5. Every day I face the same problem: java outOfMemory error. That happens because of small vm.max_map_count value, 65530 only when 262144 is recommended. Problem The problem is that…
Valentina
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3 answers

How do you manage Java in your Windows/Active Directory environment?

Like I suppose a lot of people, we have a Windows/Active Directory environment and a lot of internal line of business apps that require Java. Our experience is that Java does not play nice in such a corporate network environment. Initial…
Maximus Minimus
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15
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4 answers

Cannot switch, ssh to specific user: su: cannot set user id: Resource temporarily unavailable?

/var/log/secure: su: pam_keyinit(su-l:session): Unable to change UID to 500 temporarily su: pam_keyinit(su-l:session): Unable to change UID to 500 temporarily su: pam_unix(su-l:session): session opened for user adtech by root(uid=0) su:…
quanta
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1 answer

Copy a Java keystore on one machine to another?

I have a keystore on one machine (at /root/.keystore) and I want to move it to another machine at the same location. Currently, the second machine doesn't have a keystore at /root/.keystore, is there a way I can export then create/import? Or do I…
Brandon
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13
votes
6 answers

Set JDK 8 as the default Java on Debian 8

I'm trying to set the Java SDK 8 tools (installed from the debian backports repo) as the defaults. # update-java-alternatives --list java-1.7.0-openjdk-amd64 1071 /usr/lib/jvm/java-1.7.0-openjdk-amd64 java-1.8.0-openjdk-amd64 1069…
Edd Barrett
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13
votes
1 answer

Suddenly error='Cannot allocate memory' (errno=12)

So this morning I noticed my website is down, went on my server and saw that the webserver has been stopped. When I try to start it again I get this error start -Dhttp.port=80 -Dapplication.secret=********** [info] Wrote…
Jakob Abfalter
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13
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4 answers

ps aux hanging on high cpu/IO with java processes

I'm having some issues with java process and nrpe checks. We have some processes that sometimes use 1000% cpu on a 32 core system. The system is pretty responsive until you do a ps aux or try to do anything in the /proc/pid#…
Mike
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4 answers

How to convince my Administrator that Java ON A SERVER is not insecure per se?

The Application We have a small Java application which uses some Camel routes to pick up uploaded files from a webserver, process them and send out some e-mails with the results. The server on which this application was running has been…
lajuette
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7 answers

Run Jar in Background on Linux

I have a jar that runs forever (infinite loop with socket listening thread) and need it to run in the background at all times. An example would be: "java -jar test.jar" How do I do this? Thanks in advance!
Benny
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12
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6 answers

Open source tomcat log viewer

I'm managing several tomcat instances (aprox 30-35) and looking for some console to centralize the logs. I tried php-syslog-ng before (no with tomcat), and found it useful. I would like that these software would have some of these features: -Syntax…
Ari
12
votes
1 answer

Installing openjdk 11 on alpine:3.9

I'm trying to build an alpine docker image with openjdk 11. To do so, I'm starting an alpine container: docker run -it alpine:3.9 /bin/sh And running the following: export JAVA_HOME=/opt/openjdk-11 export PATH=$JAVA_HOME/bin:$PATH export…
Thiago
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3 answers

How to generate new, 2048-bit Diffie-Hellman parameters with Java keytool?

We are non-experts trying - unsuccessfully so far - to update our web server (JBoss-5.1.0.GA) settings to meet Diffie-Hellman standards. After running a test on https://weakdh.org/sysadmin.html, we are told that we need to "generate new, 2048-bit…
user2072931
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