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  This is my Java blog with various tips and tricks that are targeted for medium and advanced Java users. I am a guy living in Palo Alto, California, but I am originally from Sweden. I am working as CTO on Speedment with Java and database application acceleration. Check it out on www.speedment.com Pull down all the source code on this blog using "git clone https://github.com/minborg/javapot.git". I encourage any contribution and improvement on the source code. Happy Reading! /Per Minborg Enforcing Java Singletons is Very Hard Background A  singleton  is a class that is instantiated exactly one time and can be used to represent "global" or system wide components. Common usages of singletons include loggers, factories, window managers or platform components. My general tip is to avoid using singletons when possible, because it is difficult to break out or override functionality and also to write test mocks and they also tend to create a bad over all code structure. As...

  Determination of proper Java Heap size for a production system is not a straightforward exercise. In my Java EE enterprise experience, I have seen multiple performance problem cases due to inadequate Java Heap capacity and tuning. know more java training  This article will provide you with 5 tips that can help you determine optimal Java heap size, as a starting point, for your current or new production environment. Some of these tips are also very useful regarding the prevention and resolution of java.lang.OutOfMemoryError problems; including memory leaks. Please note that these tips are intended to “help you” determine proper Java Heap size. Since each IT environment is unique, you are actually in the best position to determine precisely the required Java Heap specifications of your client’s environment. Some of these tips may also not be applicable in the context of a very small Java standalone application but I still recommend you to read the entire article. Future artic...