##### Overview

- Download PMD 4.2.5
- What's new in PMD 4.2.5
- PMD in the news
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- Best practices
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- Similar projects
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- What does 'PMD' mean?

##### Usage

- Installation
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- Suppressing warnings
- Finding duplicated code
- JSP support

##### Customizing PMD

- Compiling PMD
- How to write a rule
- Writing XPath rules
- How to make a rule set
- How it works
- Rule guidelines

##### For example

- Run PMD on a Sourceforge project

##### Rule Sets

- Index
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##### Project Documentation

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##### Legend

- External Link
- Opens in a new window

## scratchpad

These are new rules that are still in progress.

### DataflowAnomalyAnalysis

Since: PMD

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 |
maxpaths | 1000 |