Introduction This posting deals with analysis of Thread dumps, for improving Middleware Performance (at App Server or Application level) as well as for general...
Introduction This posting deals with analysis of Thread dumps, for improving Middleware Performance (at App Server or Application level) as well as for general troubleshooting. It will also go into details of WebLogic Application Server specific Thread Dump Analysis and fine tuning. Main Article This section details with basics of thread states and locking in general. Subsequent sections will deal with capturing thread dumps and analysis with particular emphasis on WebLogic...
Introduction This posting deals with analysis of Thread dumps, for improving Middleware Performance (at App Server or Application level) as well as for general troubleshooting. It will also go...
Introduction A customer recently used strace on a WebLogic server that was having some trouble. The first thing that jumped out at them was hundreds of SIGSEGV,...
Introduction A customer recently used strace on a WebLogic server that was having some trouble. The first thing that jumped out at them was hundreds of SIGSEGV, also known as Segmentation Fault, events showed up in the output. They opened a support incident and asked for more information on what might be causing all of those segmentation faults. Main Article Most people that have used Unix for any amount of time are familiar with occasionally seeing "Segmentation Fault (core...
Introduction A customer recently used strace on a WebLogic server that was having some trouble. The first thing that jumped out at them was hundreds of SIGSEGV, also known as Segmentation...
I posted a few days ago about finding which JAR file contains a class file – something I often want to do. My friend Chris Johnson promptly posted a better...
I posted a few days ago about finding which JAR file contains a class file – something I often want to do. My friend Chris Johnson promptly posted a better version here with caching – thanks Chris! Chris said I inspired him to finish his script and in return he has inspired me to improve it further. As I often work with JAR files in a development environment, and often a lot of them, the search can take a while, so the caching is great. But – those files can change over...
I posted a few days ago about finding which JAR file contains a class file – something I often want to do. My friend Chris Johnson promptly posted a better version here with caching – thanks Chris!...
So my compatriot Mark posted a little utility he just wrote that makes it easy to find out which JAR file contains the file you're looking for. I often want to...
So my compatriot Mark posted a little utility he just wrote that makes it easy to find out which JAR file contains the file you're looking for. I often want to search through a large number of JAR files looking for a particular class, and every time I do this I wish I had some utility to make it easier. Which inspired me to dust off my only part done equivalent and finish it up. So here's my version of Mark's utility. It's mostly the same - I just added a very simple cache so...
So my compatriot Mark posted a little utility he just wrote that makes it easy to find out which JAR file contains the file you're looking for. I often want to search through a large number of...
I often want to search through a large number of JAR files looking for a particular class, and every time I do this I wish I had some utility to make it easier....
I often want to search through a large number of JAR files looking for a particular class, and every time I do this I wish I had some utility to make it easier. So I finally made one: #!/bin/sh TARGET="$1" for i in `find . -name "*jar"` do jar tvf $i | grep $TARGET > /dev/null if [ $? == 0 ] then echo "$TARGET is in $i" fi done Update: My colleague Chris Johnson just posted a better version of this, with some caching over at the Fusion Security Blog.
I often want to search through a large number of JAR files looking for a particular class, and every time I do this I wish I had some utility to make it easier. So I finally made one:...
Introduction Recently, I have been working with a number of customers on JVM tuning exercises. It seems that there is not widespread knowledge amongst...
Introduction Recently, I have been working with a number of customers on JVM tuning exercises. It seems that there is not widespread knowledge amongst developers and administrators about how garbage collection works, and how the JVM uses memory. So, I decided to write a very basic introduction and an example that will let you see it happening in real time! This post does not try to cover everything about garbage collection or JVM tuning – that is a huge area, and there are...
Introduction Recently, I have been working with a number of customers on JVM tuning exercises. It seems that there is not widespread knowledge amongst developers and administrators about how garbage...
Introduction Here is a sample code to show how to extract JVM GC statistics from JVM log files. Main Article Recently, I was doing some work on tuning Garbage...
Introduction Here is a sample code to show how to extract JVM GC statistics from JVM log files. Main Article Recently, I was doing some work on tuning Garbage Collection in a HotSpot JVM (Sun JVM) underneath WebLogic Server 10.3.3. In order to do this, I wanted to look at the Garbage Collection logs. The JVM will produce these logs for you if you pass in the following parameters: -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -Xloggc:gc.log In this particular case though, only...
Introduction Here is a sample code to show how to extract JVM GC statistics from JVM log files. Main Article Recently, I was doing some work on tuning Garbage Collection in a HotSpot JVM (Sun...
Introduction I was working with a very large VMWare image today, containing Oracle E-Business Suite R12. The image is located on an external USB drive, simply...
Introduction I was working with a very large VMWare image today, containing Oracle E-Business Suite R12. The image is located on an external USB drive, simply because it is too large to fit on the internal disk on the available host machine. It was running very, very slow, in fact so slow that it was completely unusable. A little bit of research turned up some settings that can be used in this kind of situation. Main Article The problem seems to be that VMWare creates a...
Introduction I was working with a very large VMWare image today, containing Oracle E-Business Suite R12. The image is located on an external USB drive, simply because it is too large to fit on the...
I spent several hours today beating my head against a wall and thought I'd post this in case anyone else runs into the same problem. I have a virtual...
I spent several hours today beating my head against a wall and thought I'd post this in case anyone else runs into the same problem. I have a virtual environment with two machines, one is a KDC and one is just a WebLogic server. I setup WebLogic to do Kerberos, following the directions in the the documentation and could not figure out what I was doing wrong. Whenever I accessed WebLogic I kept seeing the header "Authorization: Negotiate TlRMTVNTUAAB..." with only a short...
I spent several hours today beating my head against a wall and thought I'd post this in case anyone else runs into the same problem. I have a virtual environment with two machines, one is a KDC and...
