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

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0
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1answer
38 views

OSX Maverick Java version's mess

I have installed from the Oracle website, the latest version of Java needed to run Cassandra. Unfortunately, I still get the error message : "Cassandra 2.0 and later require Java 7u25 or later." ...
0
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0answers
13 views

jinfo for java-7-openjdk-amd64

I am trying to check my memory settings currently in use with tomcat via jinfo on Ubuntu. However when running jinfo -flags <PID> against the tomcat PID, I get the following error: $ sudo ...
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0answers
41 views

Why doesn't Linux strace show activity on a particular socket from java

This has been confusing me for a while now. I have a Java app (specifically, Glassfish, 3.1.2.2). I want to see how it handles the main HTTP socket that is used to for serving HTTP requests. I can ...
0
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0answers
13 views

Difference between ps_mem.py & free -m . Ubuntu server kills processes

Previously, I had a 4GB RAM server with Linode. Several times, I did "free -m" command to check available memory. I asked question here as well, but realized its more appropriate here. Most of the ...
-2
votes
0answers
15 views

Soft link between filesystems on CentOS with java 8 app ok?

So our basic software setup is to host application data in the /var/app-name/data directory. However some setups have minimal disk space allocated to the root filesystem (basically just enough for the ...
-2
votes
0answers
22 views

What are the correct memory settings for Tomcat 7 under java 8?

How is memory set in tomcat-8 with java-8 as jvm? In java-7 using java-7 i would create a file with contetnts as below #!/bin/sh export JAVA_OPTS="-Xms1000m -Xmx6000m" /tomcat/bin/startup.sh How ...
0
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0answers
13 views

windows single sign on tomcat through IIS Url rewrite

I'm facing a difficult setup where I have to configure single sign on, based on the logged in used on my tomcat application. I already took some steps which allow me to login via single sign on ...
2
votes
0answers
28 views

mod_ssl client certificates on a reverse proxy

I am trying to add client certificate authentication on a reverse proxy that proxies an oracle application. Before adding, and if i remove the subsequent code, the oracle application is able to start ...
2
votes
3answers
29 views

How can I verify the heap size startup arguments for an active JVM that's running as a Windows service and loading JVM params from registry?

I've got a Windows server with a third-party application on it that runs as a Windows service. The service/application is actually a java virtual machine however it displays in task manager as an exe ...
3
votes
1answer
117 views

Is it appropriate to use HeapDumpOnOutOfMemoryError in Production?

We have been struggling to diagnose the cause of an OutOfMemoryError we experienced on one of our production servers. Our attempts to reproduce the issue in soak tests have so far failed, and we are ...
0
votes
2answers
79 views

ColdFusion 11 and Java 8u25 and -XX:+UseStringDeduplication don't want to work

I have a ColdFusion 11 update 2 server and I wanted to try out new Java UseStringDeDuplication Setting that does work -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005 ...
0
votes
2answers
25 views

Automatically stop Tomcat if Root context initialization fails

I can't seem to figure out if it's possible to setup Tomcat to stop when the ROOT context initialization fails. Since my Tomcat instance only hosts one application as the ROOT context, it makes no ...
2
votes
3answers
60 views

java program out of memory before reaching xmx

On a Redhat CentOS 6.4 are only a few process running, using about 3GB RAM (System has 12GB available). One of the processes is a WSO2ESB Server (java), we start it with those parameters: -Xms2048m ...
-1
votes
1answer
23 views

enable java app to establish http connection under network of VPN.

Some relative question http://stackoverflow.com/questions/17170980/connect-to-http-server-behind-vpn-with-java has already asked in Stack Overflow while I don't still have a solution since this should ...
1
vote
1answer
46 views

Apache2 / tomcat / MySQL / PageSpeed Server hanging once a day

My server started to hang at least once a day. It remains so until I restart Tomcat. I'm not sure yet which part causes the problem, so I'm trying to work on several hypotheses: My website is served ...
1
vote
1answer
80 views

What ciphers are compatible with both Java 6/Tomcat 7 and IE8 (XP)?

I have disabled SSL3 and restricted the ciphers available to a recommended set but now I can't access my server using IE8 on Windows XP. If I allow all ciphers then I can connect using IE8 but when I ...
0
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0answers
40 views

Memory usage of Postgresql and play framework

I am running a play framework application and a Postgresql server on a VPS which has 2vCores and 2GB of RAM and I'm having memory issues. I limited my play application to 1024MB with the parameter : ...
-2
votes
1answer
41 views

Does GlassFish Server need JDK or JRE in order to run Java EE applications? [closed]

I want to Install GlassFish Server in a computer without a GUI. I would like to know if a JDK or a JRE is required in order to run Java Platform, Enterprise Edition (Java EE) applications?
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votes
2answers
115 views

AWS Beanstalk redirect entire application from http to https

I've been trying to figure this out for a while and have not had any luck. As I'm sure you guys are well aware, the aws load balancer forwards all https request onto the ec2 instance over port 80. I ...
0
votes
0answers
35 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 ...
0
votes
0answers
45 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. ...
-2
votes
2answers
70 views

Do we need enterprise support for RHEL/CentOS and PostgreSQL [closed]

We are an SI currently working on a proposal for an web app solution with tight budget. The 3rd party web app is written in JDK7 is to be deployed to 2 physical server running 3 VM each, one for ...
0
votes
0answers
14 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 ...
9
votes
4answers
404 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 ...
0
votes
1answer
37 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 ...
0
votes
1answer
45 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 ...
1
vote
1answer
40 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
votes
1answer
2k 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 ...
0
votes
1answer
129 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 ...
0
votes
0answers
36 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 ...
11
votes
2answers
2k 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 ...
0
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2answers
240 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 ...
1
vote
2answers
101 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
votes
1answer
68 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
votes
1answer
110 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
votes
1answer
118 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 ...
2
votes
0answers
94 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 ...
0
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0answers
18 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
49 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
votes
0answers
32 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
79 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: ...
0
votes
2answers
31 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 ...
0
votes
0answers
132 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 ...
1
vote
0answers
201 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 ...
0
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0answers
138 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
35 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 ...
0
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0answers
180 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 ...
0
votes
1answer
37 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
346 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 ...
1
vote
0answers
315 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 ...