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resources.report.rules.pmd.DataflowAnomalyAnalysis.html Maven / Gradle / Ivy

DataflowAnomalyAnalysis

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.


  
UR - Anomaly: There is a reference to a variable that was not defined before. This is a bug and leads to an error.
  
DU - Anomaly: A recently defined variable is undefined. These anomalies may appear in normal source text.
  
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.lang.java.rule.controversial.DataflowAnomalyAnalysisRule
Example(s):



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