BAEL-3091: The Prototype Pattern in Java (changed code based on valid comments from a reader)

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

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+<?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>

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

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

static-analysis/src/test/java/com/baeldung/pmd/CntUnitTest.java

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+package com.baeldung.pmd;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class CntUnitTest {
+
+    private Cnt service;
+
+    @Test
+    public void whenSecondParamIsZeroShouldReturnIntMax(){
+        service = new Cnt();
+        int answer = service.d(100,0);
+        assertEquals(Integer.MAX_VALUE, answer);
+    }
+}