Question Of The Day - Repository

This page provides a consolidated and split view of all the question of the day (QOTD) articles available from this Blog. It includes QOTD articles on Java, Java EE, middleware technologies, monitoring and more.

Simply browse through the different sections and select the topic of your choice.

As usual, please feel free to post any question or comment on any topic.

Java

Common Java problems

·        ClassCastException and ClassLoader Puzzle

JVM

·        Why can’t you increase the JVM thread capacity (total # of threads) by expanding the Java heap space capacity via -Xmx?

·        How can you monitor and calculate how much CPU % each of the Oracle HotSpot or JRockit JVM garbage collection (GC) threads is using at runtime on Linux OS?

·        HotSpot 32-bit to 64-bit upgrade: what to look for?

Middleware technologies (Weblogic)

Weblogic threads

·        What is the difference between Oracle Weblogic thread states & attributes (Total, Standby, Active, idle, Hogging, Stuck)?

·        How can you monitor the JVM threads in an efficient manner using the Weblogic admin console?

·        How can you detect the presence of STUCK threads?