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Alibaba Java Coding Guidelines PMD implementations(XenoAmess TPM)
There is a newer version: 2.2.1.0x
<?xml version="1.0"?>

<ruleset name="AlibabaJavaOop" 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>AlibabaJavaOop</description>

    <rule name="EqualsAvoidNullRule"
          language="java"
          message="java.oop.EqualsAvoidNullRule.rule.msg"
          class="com.xenoamess.p3c.pmd.lang.java.rule.oop.EqualsAvoidNullRule">
        <priority>2</priority>

        <example>
            <![CDATA[
    public void f(String str){
        String inner = "hi";
        if (inner.equals(str)) {
            System.out.println("hello world");
        }
    }
            ]]>
        </example>
    </rule>

    <rule name="WrapperTypeEqualityRule"
          language="java"
          message="java.oop.WrapperTypeEqualityRule.rule.msg"
          class="com.xenoamess.p3c.pmd.lang.java.rule.oop.WrapperTypeEqualityRule">
        <description>java.oop.WrapperTypeEqualityRule.rule.desc</description>
        <priority>1</priority>

        <example>
            <![CDATA[
    Integer a = 235;
    Integer b = 235;
    if (a.equals(b)) {
        // code
    }
            ]]>
        </example>
    </rule>

    <rule name="PojoMustUsePrimitiveFieldRule"
          language="java"
          message="java.oop.PojoMustUsePrimitiveFieldRule.rule.msg"
          class="com.xenoamess.p3c.pmd.lang.java.rule.oop.PojoMustUsePrimitiveFieldRule">
        <description>java.oop.PojoMustUsePrimitiveFieldRule.rule.msg.desc</description>
        <priority>3</priority>

        <example>
            <![CDATA[
    public class DemoDO {
        String str;
        Integer a;
    }
            ]]>
        </example>
    </rule>

    <rule name="PojoNoDefaultValueRule"
          language="java"
          message="java.oop.PojoNoDefaultValueRule.rule.msg"
          class="com.xenoamess.p3c.pmd.lang.java.rule.oop.PojoNoDefaultValueRule">
        <priority>3</priority>

        <example>
            <![CDATA[
    public class DemoDO {
        String str;
        Integer a;
    }
            ]]>
        </example>
    </rule>

    <rule name="PojoMustOverrideToStringRule"
          language="java"
          message="java.oop.PojoMustOverrideToStringRule.rule.msg"
          class="com.xenoamess.p3c.pmd.lang.java.rule.oop.PojoMustOverrideToStringRule">
        <description>java.oop.PojoMustOverrideToStringRule.rule.desc</description>
        <priority>3</priority>

        <example>
            <![CDATA[
    public class ToStringDemo extends Super{
        private String secondName;

        @Override
        public String toString() {
            return super.toString() + "ToStringDemo{" + "secondName='" + secondName + '\'' + '}';
        }
    }

    class Super {
        private String firstName;

        @Override
        public String toString() {
            return "Super{" + "firstName=" + firstName + '\'' + '}';
        }
    }
            ]]>
        </example>
    </rule>

    <rule name="StringConcatRule"
          language="java"
          message="java.oop.StringConcatRule.rule.msg"
          class="com.xenoamess.p3c.pmd.lang.java.rule.oop.StringConcatRule">
        <description>java.oop.StringConcatRule.rule.msg.desc</description>
        <priority>3</priority>

        <example>
            <![CDATA[
Negative example:
    String result;
    for (String string : tagNameList) {
        result = result + string;
    }
]]>
        </example>
        <example>
            <![CDATA[
Positive example:
    StringBuilder stringBuilder = new StringBuilder();
    for (String string : tagNameList) {
        stringBuilder.append(string);
    }
    String result = stringBuilder.toString();
]]>
        </example>
    </rule>

    <rule name="BigDecimalAvoidDoubleConstructorRule"
          language="java"
          message="java.oop.BigDecimalAvoidDoubleConstructorRule.rule.msg"
          class="com.xenoamess.p3c.pmd.lang.java.rule.oop.BigDecimalAvoidDoubleConstructorRule">
        <description>java.oop.BigDecimalAvoidDoubleConstructorRule.rule.msg.desc</description>
        <priority>3</priority>

        <example>
            <![CDATA[
Negative example:
    BigDecimal good1 = new BigDecimal(0.1);
]]>
        </example>
        <example>
            <![CDATA[
Positive example:
    BigDecimal good1 = new BigDecimal("0.1");
    BigDecimal good2 = BigDecimal.valueOf(0.1);
]]>
        </example>
    </rule>
</ruleset>