JVM (Java Virtual Machine) is an abstract computing machine (or virtual machine), a platform-independent execution environment that converts Java bytecode into machine language and executes it.

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How to determine what websites or local applications are using JVM/JRE

We run a large Windows shop -- tens of thousands of workstations. Most have a version of the Sun/Oracle Java Virtual Machine (JVM) installed. With all the security issues around the JVM, we'd like to ...
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389 views

What are the best practices for monitoring and alerting for low level JVM metrics?

I'm looking to set up monitoring and alerting for java server based app and want to find some best practices for monitoring JVM specific metrics and for designing alerts based on those metrics. So ...
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261 views

Amazon Ec2 segfault error

I have a production Java application hosted on Jetty. During the last week or so, the system has crashed, leaving only a single message accessed with "dmesg": java[20551]: segfault at ...
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467 views

Migrating WebLogic 10.3.0 to new host. Slow managed server startup times

We are migrating our Blue Martini Commerce application (only supported on WebLogic 10.3.0) to a new host (Redhat 6.3 on a VMWare ESX vm). We are seeing extremely slow start up times for our managed ...
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195 views

Reduce Tomcat6 memory footprint

This is my setenv.bat (windows installation). It's the MySQL enterprise monitor service manager. set JAVA_HOME=D:\MYSQL_~2\SERVIC~1\java set JAVA_OPTS= ++JvmOptions="-XX:+UseParallelOldGC" ...
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146 views

Local Proxy tool which authenticates against NTLM, sits on top of the Java VM and possibly transparently passes through HTTPS requests

I'm looking for a local HTTP proxy which I can run locally on my machine. This proxy accepts HTTP and HTTPS request and passes them upstream on to an external corporate proxy. The local proxy needs to ...
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198 views

-XX:MaxNewSize and other JVM parameter setting in AIX

All, I am trying to adjust our application's memory settings: JVM and Heap adjustments. I also came across -XX:MaxNewSize parameter. Our application runs on a AIX machine which has ample RAM (100+ ...
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214 views

java.lang.OutOfMemoryError: GC overhead limit exceeded TeamCity 7.0

I am getting this error suddenly. Running teamcity 7.0 on a Windows Server 2008. How do I add more memory via passing options to the JVM? I don't understand how to pass the xmx option when using ...
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Can the JVM(Oracle) run into an OutOfMemory error if the heap size is below the max?

I am running a Tomcat site(with an NGinx front end) that seems to be randomly running out of memory even though the max heap size is pretty large. My question is is it possible for the JVM to get an ...
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667 views

Tomcat web application intermittent freeze

I have a Grails web application (just a standard war file) deployed on a Ubuntu 10.10 server running on tomcat 6. My database is postgresql. The problem is that every so often (once or twice a day ...
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107 views

Load balancing in Tomcat in 64-bit OS

Sorry about double post. Actually I want to move my question on StackOverflow to ServerFault but it seems like I can't do it. Below is my question: I have a web application and required load ...
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405 views

How should I deploy my JVM-based web application on ubuntu?

I've developed a web application using clojure/compojure (JVM based) and while developing I tested it using embedded jetty that runs on 0.0.0.0:8080. I would now like to deploy it to run on port 80 on ...
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Tuning Tomcat 7 on windows (for Alfresco)

I have installed Tomcat7 as a service on a windows server 64bit 2008 R2 to run Alfresco (4.2.c). I have 48G of ram. I have read Tomcat tuning tutorial with the JVM settings for memory. To edit the ...
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Tomcat Memory - Setting in setenv.sh not respected

I have Tomcat 7.0.35 on CentOS. I have configured setenv.sh to have the following: export JAVA_OPTS="-Dfile.encoding=UTF-8 -Xms128m -Xmx1024m -XX:PermSize=256m -XX:MaxPermSize=512m" However under ...
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Committed memory on my tomcat server

I have a problem to configure JVM on my server. The server is a machine runs on AWS with 8G of RAM and 8 CPU. There is only tomcat6 with solr on the server. Actually I have configured JVM like that: ...
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what is the default size of jvm heap when using maven to create jvm?

I am using the server started by the following command. mvn jetty:run i want to stop the server, but i failed to run mvn jetty:stop, even faild to run java -version, why? [mirror@home wpse]$ mvn ...
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How to make glassfish v3.1.1 run with -Xmx256m?

I have a t1.micro amazon instance and that machine have very scarce resources. I need for the moment to run glassfish3.1.1 (due to complete JEE6 support) on those conditions. Any guidance is welcome. ...
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Are running JVMs affected by JRE upgrade

The title pretty much says it all: I would like to perform an apt-get upgrade on my server to get the latest JRE (among other packages), but there are a couple of JVMs running which should not be ...
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HTOP virtual mem to high?

I am using HTOP to monitor my running processes. My system: Ubuntu 12.04LTS with 16GB RAM. I start my Tomcat with Xms=1G and Xmx=10G. When I HTOP I have the following output: PID USER PRI ...
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38 views

bash redirections stalling when used with jstack

I have this command that is not working and I have no idea how to debug. The command it never returns and I have to press CTRL+C. diff <(jstack 13928) <(sleep 10;jstack 13928) I want to make ...
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ColdFusion JVM: strange memory behaviour

Since last month, we got a problem on our company's server (Win2008ServerStd + IIS7 + CF enterprise 9.0.1 (hotfix2)). I used jConsole to monitor the Coldfusion JVM (1.6.0_24) activity and here's what ...