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Performance

Every once in a while I run into someone that has a JVM that is running back to back collections and yet the heap is still almost full after each attempt! When they discover that their problem is related to the JVM not having enough memory they often ask the question, why didn't the JVM throw an OutOfMemoryError? After all my application is not making any forward progress and the reason is Java...
on Jan 8, 2014

Education

Just recently I was engaged to assist with an application that wasn’t behaving. The application, running in a 1.7.0_45 JVM, relied heavily on a 3rd party SAAS framework. That vendor provided my client with a list of 26 different JVM flags that should be set. When faced with this long list of flags I couldn’t resist asking why all the flags and why these flags. After all there are more than 700...
on Dec 11, 2013

J2EE

While I don't normally blog about the exiting world of JVM command line options, this new 7.0 option, which allows you to rotate to a new GC log file, was just so exciting... err... not so widely published that I decided to share. Of course these options only apply when you've used the -Xloggc: option. The settings are; UseGCLogFileRotation, default value: false NumberOfGCLogsFiles, default value...
on Aug 20, 2012

J2SE

One of the old bits of tuning advice given when Java memory management was not as tall as it it today was to set max heap to min heap. After all, we don't really want the JVM messing around with memory when it should really be getting on with things. Fast forward a few years and the adaptive memory management picture has matured considerably. So much so that setting -Xmx == to -Xms would now...
on Dec 19, 2011
It’s after JavaONE and as promised, here is the answer to the performance puzzler with a stack trace. But first a word about JavaONE. The physical layout was the same as last year and as a result, JavaONE suffered from some of the same problems as last year. This year Oracle took a lot of advice from an advisory committee and the result was the conference made very good use of the poor...
on Oct 10, 2011