Spring scheduled annotation

 Spring has nice feature called scheduler. Just simply create class and annotate method with @Scheduled(...) annotation and it's all. You have scheduled task, that wil be executed based on your time expression. Example:

Tomcat remote debugging

You can debug remote server for example from eclipse using JPDA.

Java implement a web service client

Exist two common ways to create webservice client in java it's Axis 2 or JAX-WS. What is the best approach? here is performance comparison, it says that JAX-WS is much better (about twice). Below is the comparison table.

Specified VM install not found: type Standard VM, name jre6

Ant saying "Specified VM install not found: type Standard VM, name jre6"! Solution is to delete the "C:\Users\Sergey\juno\.metadata\.plugins\org.eclipse.debug.core\.launches\projectname build.xml.launch file"

Configuring Log4j with Java Web Applications + Tomcat

Log4j -  is a Java-based logging utility. Next i will explain hot to configure it with Web App + tomcat.

JVM Performance Tuning

while(iAmNotSatisfied){  
   size = defineMinMaxHeapSize();
   ratios =  tuneGenerationRatios();
   alg = selectAppropriateGcAlgorithm();
   testApplication(size, ratios, alg);
   iAmNotSatisfied = analyzeStatistics();
}
More details later...;)

References:
From Vladislav Gangan Software as Craft presentation
Books:
Java Performance Tuning (2nd Edition)
Pro Java EE 5 Performance Management and Optimization
Java Performance

Java HotSpot VM Options

Useful Linux commands

Some Useful Linux Commands