Remove deprecated PMD rules.

Author: garydgregory

src/site/resources/pmd/pmd-ruleset.xml

@@ -26,13 +26,10 @@
   <!-- Default ruleset for maven-pmd-plugin -->
   <rule ref="category/java/bestpractices.xml/AvoidUsingHardCodedIP"/>
   <rule ref="category/java/bestpractices.xml/CheckResultSet"/>
-  <rule ref="category/java/bestpractices.xml/UnusedImports"/>
   <rule ref="category/java/bestpractices.xml/UnusedFormalParameter"/>
   <rule ref="category/java/bestpractices.xml/UnusedLocalVariable"/>
   <rule ref="category/java/bestpractices.xml/UnusedPrivateField"/>
   <rule ref="category/java/bestpractices.xml/UnusedPrivateMethod"/>
-  <rule ref="category/java/codestyle.xml/DontImportJavaLang"/>
-  <rule ref="category/java/codestyle.xml/DuplicateImports"/>
   <rule ref="category/java/codestyle.xml/ExtendsObject"/>
   <rule ref="category/java/codestyle.xml/ForLoopShouldBeWhileLoop"/>
   <!-- See custom rules -->
@@ -54,16 +51,7 @@
   <rule ref="category/java/errorprone.xml/ClassCastExceptionWithToArray"/>
   <rule ref="category/java/errorprone.xml/DontUseFloatTypeForLoopIndices"/>
   <rule ref="category/java/errorprone.xml/EmptyCatchBlock"/>
-  <rule ref="category/java/errorprone.xml/EmptyFinallyBlock"/>
-  <rule ref="category/java/errorprone.xml/EmptyIfStmt"/>
-  <rule ref="category/java/errorprone.xml/EmptyInitializer"/>
-  <rule ref="category/java/errorprone.xml/EmptyStatementBlock"/>
   <rule ref="category/java/errorprone.xml/EmptyStatementNotInLoop"/>
-  <rule ref="category/java/errorprone.xml/EmptySwitchStatements"/>
-  <rule ref="category/java/errorprone.xml/EmptySynchronizedBlock"/>
-  <rule ref="category/java/errorprone.xml/EmptyTryBlock"/>
-  <rule ref="category/java/errorprone.xml/EmptyWhileStmt"/>
-  <rule ref="category/java/errorprone.xml/ImportFromSamePackage"/>
   <rule ref="category/java/errorprone.xml/JumbledIncrementer"/>
   <rule ref="category/java/errorprone.xml/MisplacedNullCheck"/>
   <rule ref="category/java/errorprone.xml/OverrideBothEqualsAndHashcode"/>
@@ -76,7 +64,6 @@
   <rule ref="category/java/multithreading.xml/DontCallThreadRun"/>
   <rule ref="category/java/multithreading.xml/DoubleCheckedLocking"/>
   <rule ref="category/java/performance.xml/BigIntegerInstantiation"/>
-  <rule ref="category/java/performance.xml/BooleanInstantiation"/>
 
   <!-- Custom rules. -->