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PMD is a tool that looks for potential problems like possible bugs, dead code, suboptimal code, overcomplicated expressions or duplicate code.

The newest version!

In JDK 1.5, calling new Byte() causes memory allocation. Byte.valueOf() is more memory friendly. Example :
public class Foo {
private Byte i = new Byte(0); // change to Byte i =
Byte.valueOf(0);
}