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Java Thread at RUNNABLE state is not really running

Recently, I was doing an analysis/tuning on a Java application server installation in order to identify the bottlenecks and fix them. The most common action in such procedure (tuning) ...
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Exception: java lang AbstractMethodError

This java.lang.AbstractMethodError is usually thrown when we try to invoke the abstract method.Generally this error is identified at the compile time itself,if this ...
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Java Exception: java lang NoSuchMethodError

If you have a look at the error message java.lang.NoSuchMethodError you may understand that the Java Virtual Machine is trying to indicate us that the method you invoked is not available ...
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Memory Access Patterns Are Important

In high-performance computing it is often said that the cost of a cache-miss is the largest performance penalty for an algorithm. For many years the increase in speed of our processors ...
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Java 8: Testing the Lambda Water

Java 8 is about a year away and comes with a language feature I really look forward to: Lambda Expression. Sadly the other big feature, Modules for the Java Platform, has been delayed ...
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Java Executor Service Types

ExecutorService feature was come with Java 5. It extends Executor interface and provides thread pool feature to execute asynchronous short tasks. There are five ways to execute ...
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Java Concurrency – CyclicBarrier Example

CyclicBarrier in Java is a synchronizer introduced in JDK 5 on java.util.Concurrent package along with other concurrent utility like Counting ...
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Hash Length Extension Attacks

In this post I will try to leave the summer slump behind and focus on more interesting things than complaining about the weather – hash length extension attacks. Hash length extension ...
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String memory internals

This article is based on my answer on StackOverflow. I am trying to explain how String class stores the texts, how interning and constant pool works. The main ...
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IO vs. NIO – Interruptions, Timeouts and Buffers

Let’s imagine a system that sometimes needs to copy a file to a few locations, but in a way where responsiveness is critical. In other words, if for some reason a file system is overloaded ...
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