Home » Author Archives: Pierre Hugues Charbonneau (page 2)

Author Archives: Pierre Hugues Charbonneau

Pierre-Hugues Charbonneau (nickname P-H) is working for CGI Inc. Canada for the last 10 years as a senior IT consultant. His primary area of expertise is Java EE, middleware & JVM technologies. He is a specialist in production system troubleshooting, root cause analysis, middleware, JVM tuning, scalability and capacity improvement; including internal processes improvement for IT support teams. P-H is the principal author at Java EE Support Patterns.

Java Thread: retained memory analysis

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This article will provide you with a tutorial allowing you to determine how much and where Java heap space is retained from your active application Java threads. A true case study from an Oracle Weblogic 10.0 production environment will be presented in order for you to better understand the analysis process. We will also attempt to demonstrate that excessive garbage ...

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Java Heap Dump: Are you up to the task?

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If you are as much enthusiasm as I am on Java performance, heap dump analysis should not be a mystery to you. If it is then the good news is that you have an opportunity to increase your Java troubleshooting skills and JVM knowledge. The JVM has now evolve to a point that it is much easier today to generate ...

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IBM AIX: Java process size monitoring

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This article will provide you with a quick reference guide on how to calculate the Java process size memory footprint for Java VM processes running on IBM AIX 5.3+ OS. This is a complementary post to my original article on this subject: how to monitor the Java native memory on AIX. I highly recommend this read to any individual involved ...

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java.lang.ClassNotFoundException: How to resolve

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This article is intended for Java beginners currently facing java.lang.ClassNotFoundException challenges. It will provide you with an overview of this common Java exception, a sample Java program to support your learning process and resolution strategies. If you are interested on more advanced class loader related problems, I recommended that you review my article series on java.lang.NoClassDefFoundError since these Java exceptions ...

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Java deadlock troubleshooting and resolution

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One of the great things about JavaOne annual conferences is the presentation of several technical and troubleshooting labs presented by subject matter experts. One of these labs did especially capture my attention this year: “HOL6500 – Finding And Solving Java Deadlocks ”,  presented by Java Champion Heinz Kabutz . This is one of the best presentations I have seen on this subject. I ...

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3 things Java developers should know

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Here is an interesting article for those of should who have been following remotely the JavaOne 2012 conference. A recent interview with the Java Champion Heinz Kabutz was brought to my attention; including his Java memory puzzle program which was quite instructive from a Java memory management perspective. One particular section of the interview captured my attention: things Java developers ...

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Log4j Thread Deadlock – A Case Study

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This case study describes the complete root cause analysis and resolution of an Apache Log4j thread race problem affecting a Weblogic Portal 10.0 production environment. It will also demonstrate the importance of proper Java classloader knowledge when developing and supporting Java EE applications. This article is also another opportunity for you to improve your thread dump analysis skills and understand ...

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Java 7: HashMap vs ConcurrentHashMap

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As you may have seen from my past performance related articles and HashMap case studies, Java thread safety problems can bring down your Java EE application and the Java EE container fairly easily. One of most common problems I have observed when troubleshooting Java EE performance problems is infinite looping triggered from the non-thread safe HashMap get() and put() operations. ...

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