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Hosted Zimbra Email Catches On With Managed Service Providers

Saturday, 19 July 2008

MSPmentor: "When it comes to hosted email, why zig when you can zag? That explains the strategy at EtomicMail, a managed service provider that’s hosting Zimbra — an open source email platf

An Open Source Seeing Eye Dog for Web Surfers

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LinuxInsider: "WebAnywhere is an open source, Web-based application that acts as a screen reader of sorts for blind people. Its developer, a student at the University of Washington, designed it so tha

Perl and Bash Versions Of Binary To Decimal Conversion Script

Saturday, 19 July 2008

The Linux and Unix Menagerie: "As promised, in yesterday's post on converting binary values to decimal in C, today we're going to follow up with straight-up ports to Perl and shell. Actually, they'll

E4X: JavaScript on Steroids

Saturday, 19 July 2008

IBM Developerworks: "E4X is designed to simplify the task of writing JavaScript code for XML. It is an efficient, powerful tool that you can use to interact with XML nodes and attributes. The primary

Linux 2.6.26 Kernel Benchmarks

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Phoronix: "Over the weekend the Linux 2.6.26 kernel was released. This quarterly update to the Linux kernel introduced Kernel-based Virtual Machine improvements, new One Laptop Per Child support, a ne

Introduction to JVM crashes

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posted Friday, 9 September 2005

The Sun JDK uses a runtime engine called the hotspot JVM. This JVM has at least 2 compiler optimizers (client and server, also known as C1 and C2) as well as a shared runtime environment and a number of garbage collectors (gc).

This means that a JVM can fail in either of these distinct components and apart from the runtime an error can be narrowed down by selecting a different compiler. eg java -client or java -server.

The JVM will try and help diagnose a crash for you, it will print out a stack trace and try and work out if the current instruction was inside its code or a native library that it had loaded. The JVM traps many unix signals and generating a SEGV, which would be fatal to a normal app is part of the mechanism hotspot uses to allocate memory.

If the pc occurs in a native library then that is most likely that library at fault or the library is interferring with the JVM.

For more advanced notes see the Sun troubleshooting guide

http://java.sun.com/j2se/1.5/pdf/jdk50_ts_guide.pdf

tags: java jvm

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