plugin.xml

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

   <extension
       point="org.eclipse.ui.startup">
       <startup
           class="com.salesforce.apex.checkstyle.plugin.ApexCheckstylePluginStartup"/>
   </extension>

    <!-- Popupmenu actions to check selected files on demand -->
    <extension
        point="org.eclipse.ui.popupMenus">
        <objectContribution
            objectClass="org.eclipse.core.resources.IResource"
            adaptable="true"
            id="ncom.salesforce.apex.checkstyle.plugin.ondemand">
            <menu
                id="ApexCheckstyle.menu"
                label="APEX Checkstyle"
                path="additions">
                <separator
                    name="ondemand"/>
            </menu>

            <action
                label="Check code"
                class="com.salesforce.apex.checkstyle.plugin.handlers.CheckSelectedFilesAction"
                enablesFor="+"
                menubarPath="ApexCheckstyle.menu/ondemand"
                tooltip="Check code"
                id="com.salesforce.apex.checkstyle.plugin.handlers.CheckSelectedFilesAction"/>
                
             <action
                label="Replace warnings"
                class="com.salesforce.apex.checkstyle.plugin.handlers.CheckSelectedFilesAction"
                enablesFor="+"
                menubarPath="ApexCheckstyle.menu/ondemand"
                tooltip="Replace warnings"
                id="com.salesforce.apex.checkstyle.plugin.handlers.ReplaceSelectedFilesAction"/>           
        </objectContribution>
    </extension>

    <!--
        Marker
    -->
   <extension
           id="com.salesforce.apex.checkstyle.plugin.apexCheckstyleMarker"
		   point="org.eclipse.core.resources.markers"
		   name="Apex Checkstyle Warning">
		   <super type="org.eclipse.core.resources.problemmarker"/>
		   <persistent value="true"/>
   </extension>

</plugin>