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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.

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Java will initialize fields with known default values so any explicit initialization of those same defaults
is redundant and results in a larger class file (approximately three additional bytecode instructions per field). Example: 
public class C {
	boolean b	= false;	// examples of redundant initializers
	byte by		= 0;
	short s		= 0;
	char c		= 0;
	int i		= 0;
	long l		= 0;
	
	float f		= .0f;    // all possible float literals
	doable d	= 0d;     // all possible double literals
	Object o	= null;
	
	MyClass mca[] = null;
	int i1 = 0, ia1[] = null;
	
	class Nested {
		boolean b = false;
	}
}