Update MissingSerialVersionUID

pmd-java/src/main/resources/category/java/errorprone.xml

@@ -2341,8 +2341,7 @@ chain needs an own serialVersionUID field. See also [Should an abstract class ha
 <![CDATA[
 //ClassOrInterfaceDeclaration
     [@Interface = false()]
-    [count(ClassOrInterfaceBody/ClassOrInterfaceBodyDeclaration
-        /FieldDeclaration/VariableDeclarator/VariableDeclaratorId[@Name='serialVersionUID']) = 0]
+    [count(ClassOrInterfaceBody/FieldDeclaration/VariableDeclarator/VariableDeclaratorId[@Name='serialVersionUID']) = 0]
     [(ImplementsList | ExtendsList)/ClassOrInterfaceType[pmd-java:typeIs('java.io.Serializable')]]
 ]]>
                 </value>

pmd-java/src/test/java/net/sourceforge/pmd/lang/java/rule/errorprone/MissingSerialVersionUIDTest.java

@@ -6,7 +6,6 @@ package net.sourceforge.pmd.lang.java.rule.errorprone;
 
 import net.sourceforge.pmd.testframework.PmdRuleTst;
 
-@org.junit.Ignore("Rule has not been updated yet")
 public class MissingSerialVersionUIDTest extends PmdRuleTst {
     // no additional unit tests
 }

pmd-java/src/test/resources/net/sourceforge/pmd/lang/java/rule/errorprone/xml/MissingSerialVersionUID.xml

@@ -17,6 +17,8 @@ public class Foo {
         <description>Simple failure case</description>
         <expected-problems>1</expected-problems>
         <code><![CDATA[
+import java.io.Serializable;
+
 public class Foo implements Serializable {
 }
         ]]></code>