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

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Hadoop lib syncronisation

I'm using Cloudera CDH5. I try to work with Twitter Anlyse . After building flume-sources-1.0-SNAPSHOT.jar and hive-serdes-1.0-SNAPSHOT.jar I placed this jars in manually in directories on all ...
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94 views

JRuby on rails with sidekiq deploy on Java production server

I'm a RoR guy and for some time I've been stumbling with some clients who just won't install ruby (or rails) on their machine. For this I turned to jruby. I used warbler to make a .war file and ...
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0answers
155 views

Java client does not connect when bypassing proxy to corporate network

I am on a Windows 7 client that connects to a corporate network. We are running Pentaho Data Integration Client on the client that connects to a Pentaho DI Server that is on the corperate network. ...
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0answers
23 views

What are the default accessible resources for a webapp in Tomcat?

When a deploy a web application in Tomcat by default all directories I create under %TOMCAT_HOME%/webapps/mywebapp/ are accessible, i.e. files contained in the directories can be served. Except ...
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4answers
1k views

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 ...
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1answer
96 views

Script that checks and runs a jar, sometimes runs it twice.

I jave written a small bash script to run every 10 minutes, check if a certain program is running and if not run it. However, I noticed that sometimes I have two instances of the same program running ...
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1answer
94 views

What better solution to adopt for client server system implementation by java sockets

I need some advice from someone experienced in networking. I have already created a system designed to monitor some tasks (5-30) that are written in java started by a auomatic scheduler or by ...
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1answer
357 views

Disable Java auto updater via policy/script or some other automated means

I started researching on this and it turned out that this was not as easy as it seemed it would be. Basically looking to get some sort of automated way that I can turn off all the "an update is ready ...
4
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1answer
6k views

Java 8 Update 25 Install Via GPO Not Working

I am trying to set up our Active Directory DC to automatically install Java 8 Update 25 (jre1.8.0_25.msi) using Group Policy. When attempting to add the jre1.8.0_25.msi package in the GPO at Computer ...
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1answer
497 views

Elasticsearch River JDBC - Avoiding 'SELECT *'

I'd like to syncronize some MySQL tables to an ElasticSearch index, you know, for search. But almost every examples I can find show a big bad fat "SELECT * FROM", it's OK for an example, but I'm in ...
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50 views

VM State Transitions (core dump)

I have been looking over a set of core dumps for a fatal error we experience using the HotSpot JVM (version 6). The "VM State" field caught my attention looking through the files. I have seen all 3 ...
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2answers
4k views

Disabling SSLv3 but still supporting SSLv2Hello in Apache

Many SSL clients, notably JDK 6, use the SSLv2Hello protocol to handshake with the server. Using this protocol does not mean you are using SSL 2.0 or 3.0 for that matter; it is merely a handshake to ...
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2answers
945 views

JDBC Connection Pool details on Glassfish

In the context of configuring Session Beans for Entity Classes, I can get some basic information from Glassfish v4 on Ubuntu about the JDBC connection pool from the CLI with asadmin, but would like to ...
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vote
2answers
255 views

Preserve imported CA Certificates through Java upgrades

I have imported internal Certificate Authorities into Java's CA keystore. (Using keytool to import into the "cacerts" store) This works fine and dandy, until I update the Java RPM. At which point ...
0
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1answer
232 views

Connect with Java to Amazon EC2 instances

I have written a client-server application in Java and I want to run it on Amazon EC2 Ubuntu instacnes. The client runs on an EC2 instance and the server on one and the third EC2 instance is for ...
0
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1answer
194 views

Using self signed certificates with Tigase XMPP server

I am trying to use a self signed certificate, generated using http://docs.tigase.org/tigase-server/5.3.0/adminguide/#_server_certificates, to start the XMPP server. However, the server does not start ...
0
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1answer
882 views

tomcat not able to start in jpda start mode

This is my catalina.sh #!/bin/sh JAVA_HOME="/usr/local/java" CATALINA_PID="/usr/local/tomcat/tomcat.pid" CATALINA_HOME="/usr/local/tomcat" JAVA_OPTS="-Xloggc:/usr/local/tomcat/logs/gc.log -Xms3072m ...
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0answers
131 views

Inconsistent data transfer throughout Ubuntu server causes system instability and data corruption [closed]

Update 2 We replaced the CPU, and all is good. It was a busted CPU! Update We replaced the motherboard, and are still getting the exact same problem. Does this mean it is a faulty CPU? What else ...
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0answers
41 views

What could be the possible causes of a “java.io.IOException: Bad HTTP request, less data is received than expected” error?

I have a GlassFish server with a lot of "java.io.IOException: Bad HTTP request, less data is received than expected" errors in an application instance log. Anyone knows what could be the possible ...
0
votes
1answer
175 views

OpenShift allow permanent external access to PostgreSQL [closed]

I have an OpenShift gear with Nginx and PostgreSQL, and need to allow a Java applet (served from Nginx) direct access to the PG database. I've already tried to edit ...
0
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0answers
66 views

How to profile how much memory my tomcat server needs?

I'm running a tomcat server on my own for the first time and I was shocked by how much memory Java apps need compared to apps in other languages. Since I am paying a web host, I want to determine how ...
2
votes
1answer
208 views

ES fills up heap slowly over time and hangs at 14GB, while biggest index is 164MB?

I have an issue with Elasticsearch, at some times, it tries to run GC continously since this one is unable to free because heap size set to 14GB (min and max) is said to be completely allocated: ...
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2answers
33 views

Hide/mask tomcat from open access

How to mask tomcat app adress from public access easily. Let's say we run it on default port 8080. So myapp.com:8080 is easy to scan, whatever port we use it's no problem. Lockoutrealm that tomcat ...
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0answers
421 views

Hadoop data node start fails with error: java: cannot execute: Permission denied

I am facing an error in starting a Hadoop Data Node from Ambari WEB interface, and I need your help to resolve this. As always the error message is very comlex and long, but first thing first. Even ...
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0answers
443 views

Unable to convert JKS keystore to Oracle Wallet using orapki

I have generated jks keystore using keytool and using the jks keystore I have csr. The same csr I have sent to Signing authority. The Signing authority have given the trusted ...
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2answers
306 views

JVM will not start when starting Glassfish on RHEL

GlassFish 3.0.1 RHEL 6.3 When trying to start GlassFish I get the following JVM error: JVM failed to start: com.sun.enterprise.admin.launcher.GFLauncherException: The server exited prematurely with ...
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0answers
34 views

Glassfish 2.0 - per node JVM config

I have a Glassfish (2.0) cluster with two nodes. I want to pass some extra JVM settings to a single node only. Is this configurable? At least from the console I see, this selective configuration is ...
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0answers
226 views

How to protect tomcat application - user authentication with fail2ban?

AFAIK tomcat6 does not use Apache std .htaccess auth, but has own user authentication method. My question is: How to protect it against brute force attack with fail2ban ?
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0answers
136 views

Java Spring application working on one system, dying on almost identical one

Introduction I'm running a third party Java Spring application on RHEL, that refuses to run on machines cloned from a certain RHEL 6.5 template. It just dies on startup with a bogus exception (see ...
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2answers
33 views

Apple OSX with JVM support (or any virtual machine) [duplicate]

Few things I didn't understand on OS X... From 2010 until today... Throughout the internet there were several sources stating that according to Apple's EULA it wasn't legal to run any virtual ...
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93 views

Client authentication on tomcat fails

I have a Apache Tomcat 7.0.39 server running on a Windows server machine and I'm trying to enable client authentication. I first tried this using eclipse on a client machine I have (also on windows ...
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0answers
323 views

tlsv1 alert internal error - SSL certificate misconfiguration on Tomcat7

I have configured a certificate on my tomcat7 a few weeks ago and, after having an issue using a facebook plugin on my website, the Facebook Plataform Team pointed that: 'this issue is caused by an ...
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0answers
213 views

tcpdump on any interface does not support VLAN

I have tried the following command: tcpdump -i any vlan , on both Ubuntu 10.04 (kernel 2.6.32-36) and Ubuntu 12.04 (kernel 3.8.0-39) and got the following output: tcpdump: no VLAN support for data ...
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0answers
22 views

What memory settings are in effect (system or user) in a Citrix Windows 2008 environment running JRE 1.6?

I am looking at a virtual desktop on a Citrix server running a Windows 7 desktop. The JRE environment control settings look like this -Xmx300m but the user environment control settings are blank. ...
0
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1answer
44 views

TOP processes by system time

I have a system running 2 processes - MySQL and Java I'm seeing 20-30% of the time spent in %system. I've looked around to try and find a way to identify which what the balance of the system time is ...
13
votes
4answers
375 views

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 ...
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0answers
528 views

Upgrading to Java 7u65 breaks my Deployment Rule Set for Oracle applications

My company uses an older version of an Oracle application that requires Java 6u45. Naturally we want to be secure, so we use a Deployment Rule Set to specify 6u45 for that internal application and let ...
0
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2answers
171 views

Changing process priority in linux for jvm process

Is it fine if I change the JVM process priority through nice at server machine [linux]. I wanted my JVM process to use maximum resources from OS. What is the standard practice? Do people tune the ...
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0answers
473 views

JVM process resident set size “equals” max heap size, not current heap size

After a few reading about jvm memory (here, here, here, others I forgot...), I am expecting the resident set size of my java process to be roughly equal to the current heap space capacity. That's not ...
0
votes
3answers
215 views

How to update OpenJDK on RHEL

I need to update OpenJDK for one of the company servers (RHEL 6). It is currently running OpenJDK 1.7.0_09 but I need to upgrade to OpenJDK 1.7.0_45 I read some tutorials but they seem to use yum ...
0
votes
2answers
105 views

Prevent APT from overwriting custom files

My server runs a Java application that requires I replace a few java library files with ones I downloaded on my own. This has to do with JCE security extensions and isn't really relevant to my ...
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0answers
88 views

DRS: Unknown JNLP Location

We are using Deployment Rule Sets to limit access to the older JRE to well-known applications but are running into a problem. One business critical applications has the following properties (*s to ...
1
vote
1answer
424 views

RHEL Java Application returns “No space left on device” but only 3% used [duplicate]

My Java Application returns following Exception when saving a new file in /opt/wso2 on a CentOS 6.4: Caused by java.io.FileNotFoundException: ... (No space left on device) Caused by: ...
0
votes
1answer
60 views

504 error crash on openshift

I have deployed a java application in openshift. I am using bronze plan. My application is a scaled application and also uses 4GB of memeory. I got an 504 error crash two or more times in a day. ...
3
votes
2answers
807 views

Why is Wireshark not capturing certain POST requests?

If I use this filter in Wireshark: http.request.method == "POST" and use the vote buttons to vote for a stack exchange question, then Wireshark captures the corresponding POST request. I can also see ...
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0answers
213 views

CouchBase Client Fails to Cache Object less than 20mb. Time Out Error

I am caching my serialized POJO s(4mb-8mb size objects) concurrently into Couchbase server with CouchBase client (couchbase-client-1.4.3). for(upto 20 itertarions){ new Thread().start().. ...
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2answers
106 views

Java Deployment Ruleset not working

I've created a Java Deployment Ruleset that looks like this: <ruleset version="1.0+"> <rule> <id location="http://hpfweb.mydomain.com/" /> <action ...
0
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1answer
208 views

Record raw http requests in weblogic

We are running a java ee application on weblogic 12.1 that has a soap messaging component. We are having trouble with our soap responses and want to get more details so we can figure out exactly what ...
0
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0answers
455 views

java.lang.ClassNotFoundException: org.postgres.Driver when starting PuppetDB

When I start puppetdb I am getting the following error: cat /var/log/puppetdb/puppetdb.log 2014-08-06 11:29:50,558 ERROR [main] [utils.logging] Uncaught exception java.lang.ClassNotFoundException: ...
0
votes
1answer
28 views

Nginx: index mapping

I'm trying to install Nging as a frontend server for HTTP requests but the welcome page does not work: server { listen 8081; server_name localhost; root ...