Introduction to pmd (#972)

* initial check for introduction to pmd

* change name to static-analysis

* move it to static-analysis

static-analysis/pom.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.baeldung</groupId>
+    <artifactId>static-analysis</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <dependencies>
+    </dependencies>
+    
+    <reporting>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-pmd-plugin</artifactId>
+                <version>3.7</version>
+                <configuration>
+                    <rulesets>
+                        <ruleset>rulesets/java/braces.xml</ruleset>
+                        <ruleset>rulesets/java/naming.xml</ruleset>
+                    </rulesets>
+                </configuration>
+            </plugin>
+        </plugins>
+    </reporting>
+
+</project>

static-analysis/src/main/java/com/baeldung/pmd/Cnt.java

@@ -0,0 +1,12 @@
+package com.baeldung.pmd;
+
+public class Cnt {
+
+    public int d(int a, int b) {
+        if (b == 0)
+            return Integer.MAX_VALUE;
+        else
+            return a / b;
+    }
+
+}

static-analysis/src/main/resources/customruleset.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0"?>
+<ruleset name="Custom ruleset" xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 http://pmd.sourceforge.net/ruleset_2_0_0.xsd">
+
+    <description>
+    This ruleset checks my code for bad stuff
+  </description>
+
+    <!-- We'll use the entire 'strings' ruleset -->
+    <rule ref="rulesets/java/strings.xml" />
+
+    <!-- Here's some rules we'll specify one at a time -->
+    <rule ref="rulesets/java/unusedcode.xml/UnusedLocalVariable" />
+    <rule ref="rulesets/java/unusedcode.xml/UnusedPrivateField" />
+    <rule ref="rulesets/java/imports.xml/DuplicateImports" />
+    <rule ref="rulesets/java/basic.xml/UnnecessaryConversionTemporary" />
+
+    <!-- We want to customize this rule a bit, change the message and raise 
+        the priority -->
+    <rule ref="rulesets/java/basic.xml/EmptyCatchBlock" message="Must handle exceptions">
+        <priority>2</priority>
+    </rule>
+
+    <!-- Now we'll customize a rule's property value -->
+    <rule ref="rulesets/java/codesize.xml/CyclomaticComplexity">
+        <properties>
+            <property name="reportLevel" value="5" />
+        </properties>
+    </rule>
+
+    <!-- We want everything from braces.xml except WhileLoopsMustUseBraces -->
+    <rule ref="rulesets/java/braces.xml">
+        <exclude name="WhileLoopsMustUseBraces" />
+    </rule>
+
+</ruleset>