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DataflowAnomalyAnalysis


DataflowAnomalyAnalysis
aflowAnomalyAnalysis">DataflowAnomalyAnalysis
		Since: PMD 3.9
		The dataflow analysis tracks local definitions, undefinitions and references to variables on different paths on the data flow.
From those informations there can be found various problems.

1. UR - Anomaly: There is a reference to a variable that was not defined before. This is a bug and leads to an error.
2. DU - Anomaly: A recently defined variable is undefined. These anomalies may appear in normal source text.
3. DD - Anomaly: A recently defined variable is redefined. This is ominous but don't have to be a bug.
          
		
		
		    
		    
    		    
    		    
    		    

    		    This rule is defined by the following Java class:
    		    net.sourceforge.pmd.dfa.DaaRule
    		    
		    
	    
	    
        
        
        Example:
            
                    

public class Foo {
    public void foo() {
	 int buz = 5;
	 buz = 6; // redefinition of buz -> dd-anomaly
	 foo(buz);
	 buz = 2;
    } // buz is undefined when leaving scope -> du-anomaly
}

          
            
  
        

        
        
            
                This rule has the following properties:
                Name Default value Description
                
                
                    

                    maxviolations
                    100
                    The maximum number of violations per class.
                    
                
                    
                    maxpaths
                    1000
                    The maximum number of checked paths per method. A lower value will increase the performance of the rule but may decrease the number of found anomalies.

Name	Default value	Description
maxviolations	100	The maximum number of violations per class.
maxpaths	1000	The maximum number of checked paths per method. A lower value will increase the performance of the rule but may decrease the number of found anomalies.