List/Grid Tag Archives: JVM

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JavaOne 2012: Looking into the JVM Crystal Ball

I returned to Plaza A/B in the Hilton to attend the fourth session on Monday, but first went up to the top floor of the Hilton to pick up lunch. I’m reminded every year on the first day of JavaOne how surprisingly frustratin ...
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VisualVM: Monitoring Remote JVM Over SSH (JMX Or Not)

VisualVM is a great tool for monitoring JVM (5.0+) regarding memory usage, threads, GC, MBeans etc. Let’s see how to use it over SSH to monitor (or even profile, using its sampler) a remote JVM either with JMX or without it. Thi ...
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OutOfMemoryError: unable to create new native thread – Problem Demystified

As you may have seen from my previous tutorials and case studies , Java Heap Space OutOfMemoryError problems can be complex to pinpoint and resolve. One of ...
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Java Memory Model Simplified

As a typical Java developer I never monitored the memory usage of my application apart from following typical best practices like closing the connections, streams etc.. Recently we were struck with few issues in our JBoss servers ...
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BTrace: hidden gem in Java developer toolbox

This post is about BTrace which I am considering as a hidden gem for Java developer. BTrace is a safe, dynamic tracing tool for the Java platform. BTrace can be used to dynamically trace a r ...
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Which Java thread consumes my CPU?

What do you do when your Java application consumes 100% of the CPU? Turns out you can easily find the problematic thread(s) using built-in UNIX and JDK tools. No profilers or agents required. For the purpose of testing we’ll ...
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8 Ways to improve your Java EE Production Support skills

Everybody involved in Java EE production support know this job can be difficult; 7/24 pager support, multiple incidents and bug fixes to deal with on a regular basis, pressure from the client and the management team to resolve pro ...
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Java Thread at RUNNABLE state is not really running

Recently, I was doing an analysis/tuning on a Java application server installation in order to identify the bottlenecks and fix them. The most common action in such procedure (tuning) is to retrieve many Thread dumps, when system ...
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Memory Access Patterns Are Important

In high-performance computing it is often said that the cost of a cache-miss is the largest performance penalty for an algorithm. For many years the increase in speed of our processors has greatly outstripped latency gains to m ...
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Oracle Service Bus – Stuck Thread Case Study

This case study describes the complete root cause analysis process of a stuck thread problem experienced with Oracle Service Bus 11g running on AIX 6.1 and IBM Java VM 1.6. This article is also a great opportu ...
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