This blog collects some bad code that may not look so obiously bad for beginners. Beginners often struggle with the language syntax. They also have little knowledge about the standard JDK class library and how to make the best use of it.
In the end a lot of your application's performance depends on the overall quality of your code. By the way you should never underestimate the importance of memory footprint. Even though the Garbage Collection is quite fast, most server-side code's scalability is dominated and limited by its memory usage of per request/transaction duration.
1. Java Common Mistakes (part 1)
2. Java Common Mistakes (part 2)
3. Java Common Mistakes (part 3)
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