Understanding the first level JPA cache

I can bet that every Java developer at least heard about L1 (aka EntityManager or Session) cache. But is your level…

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Why should you care about equals and hashcode

Equals and hash code are fundamental elements of every Java object. Their correctness and performance are crucial for your applications.…

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Smart package structure to improve testability

There are many ways of dividing whole application into packages. Discussions about pros and cons of packaging by feature or…

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JPA in case of asynchronous processing

Few years ago in Java world it was almost obvious that every “enterprise” class project needed JPA to communicate with…

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Do we really still need a 32-bit JVM?

Even today (and it’s 2015) we have two versions or Oracle HotSpot JDK – adjusted to 32 or 64 bits architecture.…

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Using jstat to report custom JVM metric sets

I’ve always been missing possibility to configure custom headers in JStat. Of course there are a lot of predefined data…

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Dependency injection pitfalls in Spring

There are three injection variants in Spring framework: Setter-based injection Constructor-based injection Field-based injection Each of those mechanisms has advantages and…

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Need micro caching? Memoization to the rescue

Caching solves wide sort of performance problems. There are many ways to integrate caching into our applications. For example when…

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Debugging OpenJDK

Sometimes debugging Java code is not enough and we need to step over the native part of Java. I spent…

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