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Alibaba Java Coding Guidelines PMD implementations
There is a newer version: 2.1.1
<?xml version="1.0"?>

<ruleset name="AlibabaJavaSets" 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">
 
    <rule name="ClassCastExceptionWithToArrayRule"
        message="java.set.ClassCastExceptionWithToArrayRule.rule.msg"
        class="com.alibaba.p3c.pmd.lang.java.rule.set.ClassCastExceptionWithToArrayRule">
        <priority>2</priority>
        <example>
        <![CDATA[    
Negative example:  
   Integer[] a = (Integer [])c.toArray();
        ]]>
        </example> 
        <example>
        <![CDATA[
Positive example： 
   Integer[] b = (Integer [])c.toArray(new Integer[c.size()]); 
         ]]>
        </example>
    </rule>

    <rule name="UnsupportedExceptionWithModifyAsListRule"
        message="java.set.UnsupportedExceptionWithModifyAsListRule.rule.msg"
        class="com.alibaba.p3c.pmd.lang.java.rule.set.UnsupportedExceptionWithModifyAsListRule">
        <priority>2</priority>
        <example>
       <![CDATA[ 
Positive example:
   List<String> t   = Arrays.asList("a","b","c"); 
   //warn
   t.add("22");
   //warn
   t.remove("22");
   //warn
   t.clear(); 
         ]]>
         </example>
    </rule>

    <rule name="ClassCastExceptionWithSubListToArrayListRule"
        message="java.set.ClassCastExceptionWithSubListToArrayListRule.rule.msg"
        class="com.alibaba.p3c.pmd.lang.java.rule.set.ClassCastExceptionWithSubListToArrayListRule">
        <description>java.set.ClassCastExceptionWithSubListToArrayListRule.rule.msg.desc</description>
        <priority>2</priority>
        <example>
        <![CDATA[ 
Negative example:
   List<String> list = new ArrayList<String>();
   list.add("22");
   //warn
   List<String> test = (ArrayList<String>) list.subList(0, 1);	 
         ]]>
        </example>
        <example>
        <![CDATA[ 
Positive example:
   List<String> list2 = new ArrayList<String>(list.subList(0, 1));
         ]]>
         </example>
    </rule>

    <rule name="ConcurrentExceptionWithModifyOriginSubListRule"
        message="java.set.ConcurrentExceptionWithModifyOriginSubListRule.rule.msg"
        class="com.alibaba.p3c.pmd.lang.java.rule.set.ConcurrentExceptionWithModifyOriginSubListRule">
        <priority>2</priority>
        <example>
      <![CDATA[
Negative example:                
   List<String> originList = new ArrayList<String>();
   originList.add("22");
   List<String> subList = originList.subList(0, 1);
   //warn
   originList.add("22"); 
       ]]>
         </example>
    </rule>


    <rule name="DontModifyInForeachCircleRule"
        message="java.set.DontModifyInForeachCircleRule.rule.msg"
        class="com.alibaba.p3c.pmd.lang.java.rule.set.DontModifyInForeachCircleRule">
        <priority>1</priority>

        <example>
        <![CDATA[ 
 Negative example:   
   List<String> originList = new ArrayList<String>();
   originList.add("22");
   for (String item : originList) { 
      //warn
      list.add("bb");
   }  
        ]]>
       </example> 
      <example>
       <![CDATA[ 
 Positive example: 
   Iterator<Integer> it=b.iterator();		 
   while(it.hasNext()){                      
      Integer temp =  it.next();             
      if (delCondition) {
          it.remove();
      }
   }
         ]]>
      </example>
    </rule>

    <rule name="CollectionInitShouldAssignCapacityRule"
        message="java.set.CollectionInitShouldAssignCapacityRule.rule.msg"
        class="com.alibaba.p3c.pmd.lang.java.rule.set.CollectionInitShouldAssignCapacityRule">
        <description>java.set.CollectionInitShouldAssignCapacityRule.rule.msg.desc</description>
        <priority>3</priority>
        <example>
        <![CDATA[ 
 Negative example:   
   Map<String, String> map = new HashMap<String, String>();
    
        ]]>
       </example> 
      <example>
       <![CDATA[ 
 Positive example: 
   Map<String, String> map = new HashMap<String, String>(16);
         ]]>
      </example>
    </rule>

</ruleset>