plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>

   <extension
         point="org.eclipse.ui.views">
      <category
            id="GroupWarnings"
            name="Group warnings">
      </category>
      <view
            category="GroupWarnings"
            class="kokan.groupwarnings.views.GroupWarningsByResource"
            icon="icons/sample.gif"
            id="groupwarnings.views.GroupWarningsByResource"
            name="Group warnings by resource">
      </view>
   </extension>
   <extension
         point="org.eclipse.ui.perspectiveExtensions">
      <perspectiveExtension
            targetID="org.eclipse.jdt.ui.JavaPerspective">
         <view
               id="groupwarnings.views.GroupWarningsByResource"
               ratio="0.5"
               relationship="right"
               relative="org.eclipse.ui.views.TaskList">
         </view>
      </perspectiveExtension>
   </extension>

</plugin>