More symbol names

core/src/main/java/hudson/PluginManager.java

@@ -63,6 +63,7 @@ import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.FilenameUtils;
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.logging.LogFactory;
+import org.jenkinsci.Symbol;
 import org.jenkinsci.bytecode.Transformer;
 import org.jvnet.hudson.reactor.Executable;
 import org.jvnet.hudson.reactor.Reactor;
@@ -1642,7 +1643,7 @@ public abstract class PluginManager extends AbstractModelObject implements OnMas
     /**
      * {@link AdministrativeMonitor} that checks if there are any plugins with cycle dependencies.
      */
-    @Extension
+    @Extension @Symbol("pluginCycleDependencies")
     public static final class PluginCycleDependenciesMonitor extends AdministrativeMonitor {
 
         private transient volatile boolean isActive = false;
@@ -1671,7 +1672,7 @@ public abstract class PluginManager extends AbstractModelObject implements OnMas
      * {@link AdministrativeMonitor} that informs the administrator about a required plugin update.
      * @since 1.491
      */
-    @Extension
+    @Extension @Symbol("pluginUpdate")
     public static final class PluginUpdateMonitor extends AdministrativeMonitor {
 
         private Map<String, PluginUpdateInfo> pluginsToBeUpdated = new HashMap<String, PluginManager.PluginUpdateMonitor.PluginUpdateInfo>();

core/src/main/java/hudson/ProxyConfiguration.java

@@ -53,6 +53,7 @@ import org.apache.commons.httpclient.HttpClient;
 import org.apache.commons.httpclient.UsernamePasswordCredentials;
 import org.apache.commons.httpclient.auth.AuthScope;
 import org.apache.commons.httpclient.methods.GetMethod;
+import org.jenkinsci.Symbol;
 import org.jvnet.robust_http_client.RetryableHttpStream;
 import org.kohsuke.stapler.DataBoundConstructor;
 import org.kohsuke.stapler.QueryParameter;
@@ -272,7 +273,7 @@ public final class ProxyConfiguration extends AbstractDescribableImpl<ProxyConfi
         XSTREAM.alias("proxy", ProxyConfiguration.class);
     }
 
-    @Extension
+    @Extension @Symbol("proxy")
     public static class DescriptorImpl extends Descriptor<ProxyConfiguration> {
         @Override
         public String getDisplayName() {

core/src/main/java/hudson/console/HudsonExceptionNote.java

@@ -25,6 +25,7 @@ package hudson.console;
 
 import hudson.Extension;
 import hudson.MarkupText;
+import org.jenkinsci.Symbol;
 
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -95,7 +96,7 @@ public class HudsonExceptionNote extends ConsoleNote<Object> {
         return "http://stacktrace.jenkins-ci.org/search?query="+className;
     }
 
-    @Extension
+    @Extension @Symbol("stackTrace")
     public static final class DescriptorImpl extends ConsoleAnnotationDescriptor {
         @Override
         public String getDisplayName() {

core/src/main/java/hudson/console/HyperlinkNote.java

@@ -26,6 +26,7 @@ package hudson.console;
 import hudson.Extension;
 import hudson.MarkupText;
 import jenkins.model.Jenkins;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.Stapler;
 import org.kohsuke.stapler.StaplerRequest;
 
@@ -83,7 +84,7 @@ public class HyperlinkNote extends ConsoleNote {
         }
     }
 
-    @Extension
+    @Extension @Symbol("hyperlink")
     public static class DescriptorImpl extends ConsoleAnnotationDescriptor {
         public String getDisplayName() {
             return "Hyperlinks";

core/src/main/java/hudson/console/ModelHyperlinkNote.java

@@ -3,6 +3,7 @@ package hudson.console;
 import hudson.Extension;
 import hudson.model.*;
 import jenkins.model.Jenkins;
+import org.jenkinsci.Symbol;
 
 import java.io.IOException;
 import java.util.logging.Level;
@@ -64,7 +65,7 @@ public class ModelHyperlinkNote extends HyperlinkNote {
         }
     }
 
-    @Extension
+    @Extension @Symbol("hyperlinkToModels")
     public static class DescriptorImpl extends HyperlinkNote.DescriptorImpl {
         public String getDisplayName() {
             return "Hyperlinks to models";

core/src/main/java/hudson/diagnosis/HudsonHomeDiskUsageChecker.java

@@ -26,6 +26,7 @@ package hudson.diagnosis;
 import hudson.Extension;
 import jenkins.model.Jenkins;
 import hudson.model.PeriodicWork;
+import org.jenkinsci.Symbol;
 
 import java.util.logging.Logger;
 
@@ -35,7 +36,7 @@ import java.util.logging.Logger;
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension
+@Extension @Symbol("diskUsageCheck")
 public class HudsonHomeDiskUsageChecker extends PeriodicWork {
     public long getRecurrencePeriod() {
         return HOUR;

core/src/main/java/hudson/diagnosis/HudsonHomeDiskUsageMonitor.java

@@ -28,6 +28,7 @@ import hudson.model.AbstractModelObject;
 import hudson.Extension;
 import hudson.ExtensionPoint;
 import hudson.ExtensionList;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.HttpResponse;
 import org.kohsuke.stapler.HttpResponses;
 import org.kohsuke.stapler.QueryParameter;
@@ -40,7 +41,7 @@ import java.util.List;
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension
+@Extension @Symbol("diskUsageCheck")
 public final class HudsonHomeDiskUsageMonitor extends AdministrativeMonitor {
     /**
      * Value updated by {@link HudsonHomeDiskUsageChecker}.

core/src/main/java/hudson/diagnosis/MemoryUsageMonitor.java

@@ -39,6 +39,7 @@ import java.util.List;
 import java.util.ArrayList;
 import java.io.IOException;
 
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.QueryParameter;
 
 /**
@@ -46,7 +47,7 @@ import org.kohsuke.stapler.QueryParameter;
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension
+@Extension @Symbol("memoryUsage")
 public final class MemoryUsageMonitor extends PeriodicWork {
     /**
      * A memory group is conceptually a set of memory pools. 

core/src/main/java/hudson/diagnosis/NullIdDescriptorMonitor.java

@@ -29,6 +29,7 @@ import hudson.init.Initializer;
 import hudson.model.AdministrativeMonitor;
 import hudson.model.Descriptor;
 import jenkins.model.Jenkins;
+import org.jenkinsci.Symbol;
 
 import java.text.MessageFormat;
 import java.util.ArrayList;
@@ -46,7 +47,7 @@ import static hudson.init.InitMilestone.EXTENSIONS_AUGMENTED;
  * @author Kohsuke Kawaguchi
  * @since 1.402
  */
-@Extension
+@Extension @Symbol("nullId")
 public class NullIdDescriptorMonitor extends AdministrativeMonitor {
 
     private final List<Descriptor> problems = new ArrayList<Descriptor>();

core/src/main/java/hudson/diagnosis/OldDataMonitor.java

@@ -55,6 +55,7 @@ import javax.annotation.CheckForNull;
 import jenkins.model.Jenkins;
 import org.acegisecurity.context.SecurityContext;
 import org.acegisecurity.context.SecurityContextHolder;
+import org.jenkinsci.Symbol;
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.NoExternalUse;
 import org.kohsuke.stapler.HttpRedirect;
@@ -70,7 +71,7 @@ import org.kohsuke.stapler.interceptor.RequirePOST;
  *
  * @author Alan.Harder@Sun.Com
  */
-@Extension
+@Extension @Symbol("oldData")
 public class OldDataMonitor extends AdministrativeMonitor {
     private static final Logger LOGGER = Logger.getLogger(OldDataMonitor.class.getName());
 
@@ -432,7 +433,7 @@ public class OldDataMonitor extends AdministrativeMonitor {
         }
     }
 
-    @Extension
+    @Extension @Symbol("oldData")
     public static class ManagementLinkImpl extends ManagementLink {
         @Override
         public String getIconFileName() {

core/src/main/java/hudson/model/FreeStyleProject.java

@@ -25,6 +25,7 @@ package hudson.model;
 
 import hudson.Extension;
 import jenkins.model.Jenkins;
+import org.jenkinsci.Symbol;
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.NoExternalUse;
 
@@ -66,7 +67,7 @@ public class FreeStyleProject extends Project<FreeStyleProject,FreeStyleBuild> i
     @Restricted(NoExternalUse.class)
     public static /*almost final*/ DescriptorImpl DESCRIPTOR;
 
-    @Extension(ordinal=1000)
+    @Extension(ordinal=1000) @Symbol({"freeStyle","freeStyleJob"})
     public static class DescriptorImpl extends AbstractProjectDescriptor {
         public DescriptorImpl() {
             DESCRIPTOR = this;

core/src/main/java/hudson/model/JDK.java

@@ -44,6 +44,7 @@ import java.util.Arrays;
 import java.util.Collections;
 
 import jenkins.model.Jenkins;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.NoExternalUse;
@@ -166,7 +167,7 @@ public final class JDK extends ToolInstallation implements NodeSpecific<JDK>, En
         }
     }
 
-    @Extension
+    @Extension @Symbol("jdk")
     public static class DescriptorImpl extends ToolDescriptor<JDK> {
 
         public String getDisplayName() {

core/src/main/java/hudson/model/LoadStatistics.java

@@ -31,6 +31,7 @@ import hudson.model.queue.Tasks;
 import hudson.util.ColorPalette;
 import hudson.util.NoOverlapCategoryAxis;
 import jenkins.model.Jenkins;
+import org.jenkinsci.Symbol;
 import org.jfree.chart.ChartFactory;
 import org.jfree.chart.JFreeChart;
 import org.jfree.chart.axis.CategoryAxis;
@@ -380,7 +381,7 @@ public abstract class LoadStatistics {
     /**
      * Periodically update the load statistics average.
      */
-    @Extension
+    @Extension @Symbol("loadStatistics")
     public static class LoadStatisticsUpdater extends PeriodicWork {
         public long getRecurrencePeriod() {
             return CLOCK;

core/src/main/java/hudson/model/ManageJenkinsAction.java

@@ -25,13 +25,14 @@ package hudson.model;
 
 import hudson.Extension;
 import jenkins.model.Jenkins;
+import org.jenkinsci.Symbol;
 
 /**
  * Adds the "Manage Jenkins" link to the top page.
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension(ordinal=100)
+@Extension(ordinal=100) @Symbol("manageJenkins")
 public class ManageJenkinsAction implements RootAction {
     public String getIconFileName() {
         if (Jenkins.getInstance().hasPermission(Jenkins.ADMINISTER))

core/src/main/java/hudson/model/MyView.java

@@ -32,6 +32,7 @@ import java.util.List;
 import javax.servlet.ServletException;
 
 import jenkins.model.Jenkins;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 import org.kohsuke.stapler.StaplerResponse;
 import org.kohsuke.stapler.DataBoundConstructor;
@@ -93,7 +94,7 @@ public class MyView extends View {
         // noop
     }
 
-    @Extension
+    @Extension @Symbol("myView")
     public static final class DescriptorImpl extends ViewDescriptor {
         /**
          * If the security is not enabled, there's no point in having

core/src/main/java/hudson/model/MyViewsProperty.java

@@ -45,6 +45,7 @@ import jenkins.model.Jenkins;
 import net.sf.json.JSONObject;
 
 import org.acegisecurity.AccessDeniedException;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 import org.kohsuke.stapler.HttpRedirect;
 import org.kohsuke.stapler.HttpResponse;
@@ -201,7 +202,7 @@ public class MyViewsProperty extends UserProperty implements ModifiableViewGroup
         return "my-views";
     }
 
-    @Extension
+    @Extension @Symbol("myView")
     public static class DescriptorImpl extends UserPropertyDescriptor {
 
         @Override
@@ -242,7 +243,7 @@ public class MyViewsProperty extends UserProperty implements ModifiableViewGroup
         return Jenkins.getInstance().getMyViewsTabBar();
     }
     
-    @Extension
+    @Extension @Symbol("myView")
     public static class GlobalAction implements RootAction {
 
 		public String getDisplayName() {

core/src/main/java/hudson/model/PaneStatusProperties.java

@@ -8,6 +8,7 @@ import java.io.IOException;
 
 import javax.servlet.http.HttpSession;
 
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.Stapler;
 
 public class PaneStatusProperties extends UserProperty implements Saveable {
@@ -43,7 +44,7 @@ public class PaneStatusProperties extends UserProperty implements Saveable {
 		return this;
 	}
 	
-	@Extension
+	@Extension @Symbol("paneStatus")
 	public static class DescriptorImpl extends UserPropertyDescriptor {
 
 		@Override

core/src/main/java/hudson/model/PasswordParameterDefinition.java

@@ -24,6 +24,7 @@
 package hudson.model;
 
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 import org.kohsuke.stapler.DataBoundConstructor;
 import hudson.Extension;
@@ -88,7 +89,7 @@ public class PasswordParameterDefinition extends SimpleParameterDefinition {
         this.defaultValue = Secret.fromString(defaultValue);
     }
 
-    @Extension
+    @Extension @Symbol({"password","nonStoredPasswordParam"})
     public final static class ParameterDescriptorImpl extends ParameterDescriptor {
         @Override
         public String getDisplayName() {

core/src/main/java/hudson/model/ProxyView.java

@@ -32,6 +32,7 @@ import java.util.Collection;
 import javax.servlet.ServletException;
 
 import jenkins.model.Jenkins;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 import org.kohsuke.stapler.QueryParameter;
 import org.kohsuke.stapler.Stapler;
@@ -120,7 +121,7 @@ public class ProxyView extends View implements StaplerFallback {
             return FormValidation.error(Messages.ProxyView_NoSuchViewExists(value));
     }
 
-    @Extension
+    @Extension @Symbol("proxy")
     public static class DescriptorImpl extends ViewDescriptor {
 
         @Override

core/src/main/java/hudson/scm/NullSCM.java

@@ -32,6 +32,7 @@ import hudson.model.TaskListener;
 import java.io.File;
 import java.io.IOException;
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 /**
@@ -58,7 +59,7 @@ public class NullSCM extends SCM {
         return NullChangeLogParser.INSTANCE;
     }
 
-    @Extension(ordinal = Integer.MAX_VALUE)
+    @Extension(ordinal = Integer.MAX_VALUE) @Symbol("none")
     public static class DescriptorImpl extends SCMDescriptor<NullSCM> {
         public DescriptorImpl() {
             super(null);

core/src/main/java/hudson/security/GlobalSecurityConfiguration.java

@@ -45,6 +45,7 @@ import jenkins.model.Jenkins;
 import jenkins.util.ServerTcpPort;
 import net.sf.json.JSONObject;
 
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 import org.kohsuke.stapler.StaplerResponse;
 
@@ -55,7 +56,7 @@ import org.kohsuke.stapler.StaplerResponse;
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension(ordinal = Integer.MAX_VALUE - 210)
+@Extension(ordinal = Integer.MAX_VALUE - 210) @Symbol("securityConfig")
 public class GlobalSecurityConfiguration extends ManagementLink implements Describable<GlobalSecurityConfiguration> {
     
     private static final Logger LOGGER = Logger.getLogger(GlobalSecurityConfiguration.class.getName());
@@ -167,7 +168,7 @@ public class GlobalSecurityConfiguration extends ManagementLink implements Descr
         return Jenkins.getInstance().getDescriptorOrDie(getClass());
     }
     
-    @Extension
+    @Extension @Symbol("security")
     public static final class DescriptorImpl extends Descriptor<GlobalSecurityConfiguration> {
         @Override
         public String getDisplayName() {

core/src/main/java/hudson/security/HudsonPrivateSecurityRealm.java

@@ -54,6 +54,7 @@ import org.acegisecurity.providers.encoding.PasswordEncoder;
 import org.acegisecurity.providers.encoding.ShaPasswordEncoder;
 import org.acegisecurity.userdetails.UserDetails;
 import org.acegisecurity.userdetails.UsernameNotFoundException;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 import org.kohsuke.stapler.ForwardToView;
 import org.kohsuke.stapler.HttpResponse;
@@ -563,7 +564,7 @@ public class HudsonPrivateSecurityRealm extends AbstractPasswordBasedSecurityRea
             }
         }
 
-        @Extension
+        @Extension @Symbol("password")
         public static final class DescriptorImpl extends UserPropertyDescriptor {
             @Override
             public String getDisplayName() {
@@ -603,7 +604,7 @@ public class HudsonPrivateSecurityRealm extends AbstractPasswordBasedSecurityRea
      * Displays "manage users" link in the system config if {@link HudsonPrivateSecurityRealm}
      * is in effect.
      */
-    @Extension
+    @Extension @Symbol("localUsers")
     public static final class ManageUserLinks extends ManagementLink {
         public String getIconFileName() {
             if(Jenkins.getInstance().getSecurityRealm() instanceof HudsonPrivateSecurityRealm)
@@ -714,7 +715,7 @@ public class HudsonPrivateSecurityRealm extends AbstractPasswordBasedSecurityRea
         private static final String JBCRYPT_HEADER = "#jbcrypt:";
     };
 
-    @Extension
+    @Extension @Symbol("local")
     public static final class DescriptorImpl extends Descriptor<SecurityRealm> {
         public String getDisplayName() {
             return Messages.HudsonPrivateSecurityRealm_DisplayName();

core/src/main/java/hudson/security/LegacyAuthorizationStrategy.java

@@ -27,6 +27,7 @@ import hudson.Extension;
 import hudson.model.Descriptor;
 import jenkins.model.Jenkins;
 import org.acegisecurity.acls.sid.GrantedAuthoritySid;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 
 import java.util.Collection;
@@ -54,7 +55,7 @@ public final class LegacyAuthorizationStrategy extends AuthorizationStrategy {
         return Collections.singleton("admin");
     }
 
-    @Extension
+    @Extension @Symbol("legacy")
     public static final class DescriptorImpl extends Descriptor<AuthorizationStrategy> {
         public String getDisplayName() {
             return Messages.LegacyAuthorizationStrategy_DisplayName();

core/src/main/java/hudson/security/LegacySecurityRealm.java

@@ -26,6 +26,7 @@ package hudson.security;
 import org.acegisecurity.AuthenticationManager;
 import org.acegisecurity.Authentication;
 import org.acegisecurity.AuthenticationException;
+import org.jenkinsci.Symbol;
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.NoExternalUse;
 import org.springframework.web.context.WebApplicationContext;
@@ -97,7 +98,7 @@ public final class LegacySecurityRealm extends SecurityRealm implements Authenti
     @Restricted(NoExternalUse.class)
     public static /*almost final*/ Descriptor<SecurityRealm> DESCRIPTOR;
 
-    @Extension
+    @Extension @Symbol("legacy")
     public static class DescriptorImpl extends  Descriptor<SecurityRealm> {
         public DescriptorImpl() {
             DESCRIPTOR = this;

core/src/main/java/hudson/security/csrf/GlobalCrumbIssuerConfiguration.java

@@ -28,6 +28,7 @@ import jenkins.model.GlobalConfiguration;
 import jenkins.model.GlobalConfigurationCategory;
 import jenkins.model.Jenkins;
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 /**
@@ -35,7 +36,7 @@ import org.kohsuke.stapler.StaplerRequest;
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension(ordinal=195) // immediately after the security setting
+@Extension(ordinal=195) @Symbol("crumb") // immediately after the security setting
 public class GlobalCrumbIssuerConfiguration extends GlobalConfiguration {
     @Override
     public GlobalConfigurationCategory getCategory() {

core/src/main/java/hudson/slaves/NodeProvisioner.java

@@ -30,6 +30,7 @@ import jenkins.model.Jenkins;
 import static hudson.model.LoadStatistics.DECAY;
 import hudson.model.MultiStageTimeSeries.TimeScale;
 import hudson.Extension;
+import org.jenkinsci.Symbol;
 
 import javax.annotation.Nonnull;
 import javax.annotation.concurrent.GuardedBy;
@@ -599,7 +600,7 @@ public class NodeProvisioner {
      *
      * @since 1.588
      */
-    @Extension
+    @Extension @Symbol("standard")
     public static class StandardStrategyImpl extends Strategy {
 
         /** {@inheritDoc} */

core/src/main/java/hudson/slaves/RetentionStrategy.java

@@ -32,6 +32,7 @@ import hudson.util.DescriptorList;
 import java.util.Collections;
 import java.util.HashMap;
 import jenkins.model.Jenkins;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 
 import javax.annotation.concurrent.GuardedBy;
@@ -164,7 +165,7 @@ public abstract class RetentionStrategy<T extends Computer> extends AbstractDesc
             return 1;
         }
 
-        @Extension(ordinal=100)
+        @Extension(ordinal=100) @Symbol("always")
         public static class DescriptorImpl extends Descriptor<RetentionStrategy<?>> {
             public String getDisplayName() {
                 return Messages.RetentionStrategy_Always_displayName();

core/src/main/java/hudson/tasks/LogRotator.java

@@ -29,6 +29,7 @@ import hudson.model.Job;
 import hudson.model.Run;
 import jenkins.model.BuildDiscarder;
 import jenkins.model.BuildDiscarderDescriptor;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 
 import java.io.IOException;
@@ -252,7 +253,7 @@ public class LogRotator extends BuildDiscarder {
         return String.valueOf(i);
     }
 
-    @Extension
+    @Extension @Symbol("logRotator")
     public static final class LRDescriptor extends BuildDiscarderDescriptor {
         public String getDisplayName() {
             return "Log Rotation";

core/src/main/java/hudson/tasks/Maven.java

@@ -62,6 +62,7 @@ import jenkins.security.MasterToSlaveCallable;
 import net.sf.json.JSONObject;
 
 import org.apache.commons.lang.StringUtils;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 import org.kohsuke.stapler.StaplerRequest;
 
@@ -388,7 +389,7 @@ public class Maven extends Builder {
     @Deprecated
     public static DescriptorImpl DESCRIPTOR;
 
-    @Extension
+    @Extension @Symbol("maven")
     public static final class DescriptorImpl extends BuildStepDescriptor<Builder> {
         @CopyOnWrite
         private volatile MavenInstallation[] installations = new MavenInstallation[0];
@@ -624,7 +625,7 @@ public class Maven extends Builder {
             return new MavenInstallation(getName(), translateFor(node, log), getProperties().toList());
         }
 
-        @Extension
+        @Extension @Symbol("maven")
         public static class DescriptorImpl extends ToolDescriptor<MavenInstallation> {
             @Override
             public String getDisplayName() {
@@ -682,7 +683,7 @@ public class Maven extends Builder {
             super(id);
         }
 
-        @Extension
+        @Extension @Symbol("maven")
         public static final class DescriptorImpl extends DownloadFromUrlInstaller.DescriptorImpl<MavenInstaller> {
             public String getDisplayName() {
                 return Messages.InstallFromApache();

core/src/main/java/hudson/tasks/_maven/Maven3MojoNote.java

@@ -28,6 +28,7 @@ import hudson.MarkupText;
 import hudson.console.ConsoleAnnotationDescriptor;
 import hudson.console.ConsoleAnnotator;
 import hudson.console.ConsoleNote;
+import org.jenkinsci.Symbol;
 
 import java.util.regex.Pattern;
 
@@ -57,7 +58,7 @@ public class Maven3MojoNote extends ConsoleNote {
         return null;
     }
 
-    @Extension
+    @Extension @Symbol("maven3Mojos")
     public static final class DescriptorImpl extends ConsoleAnnotationDescriptor {
         public String getDisplayName() {
             return "Maven 3 Mojos";

core/src/main/java/hudson/tasks/_maven/MavenErrorNote.java

@@ -28,6 +28,7 @@ import hudson.MarkupText;
 import hudson.console.ConsoleAnnotationDescriptor;
 import hudson.console.ConsoleAnnotator;
 import hudson.console.ConsoleNote;
+import org.jenkinsci.Symbol;
 
 import java.util.regex.Pattern;
 
@@ -44,7 +45,7 @@ public class MavenErrorNote extends ConsoleNote {
         return null;
     }
 
-    @Extension
+    @Extension @Symbol("mavenErrors")
     public static final class DescriptorImpl extends ConsoleAnnotationDescriptor {
         public String getDisplayName() {
             return "Maven Errors";

core/src/main/java/hudson/tasks/_maven/MavenMojoNote.java

@@ -28,6 +28,7 @@ import hudson.MarkupText;
 import hudson.console.ConsoleAnnotationDescriptor;
 import hudson.console.ConsoleAnnotator;
 import hudson.console.ConsoleNote;
+import org.jenkinsci.Symbol;
 
 import java.util.regex.Pattern;
 
@@ -49,7 +50,7 @@ public class MavenMojoNote extends ConsoleNote {
         return null;
     }
 
-    @Extension
+    @Extension @Symbol("mavenMojos")
     public static final class DescriptorImpl extends ConsoleAnnotationDescriptor {
         public String getDisplayName() {
             return "Maven Mojos";

core/src/main/java/hudson/tasks/_maven/MavenWarningNote.java

@@ -28,6 +28,7 @@ import hudson.MarkupText;
 import hudson.console.ConsoleAnnotationDescriptor;
 import hudson.console.ConsoleAnnotator;
 import hudson.console.ConsoleNote;
+import org.jenkinsci.Symbol;
 
 import java.util.regex.Pattern;
 
@@ -46,7 +47,7 @@ public class MavenWarningNote extends ConsoleNote {
         return null;
     }
 
-    @Extension
+    @Extension @Symbol("mavenWarnings")
     public static final class DescriptorImpl extends ConsoleAnnotationDescriptor {
         public String getDisplayName() {
             return "Maven Warnings";

core/src/main/java/hudson/tools/InstallSourceProperty.java

@@ -27,6 +27,7 @@ import hudson.Extension;
 import hudson.util.DescribableList;
 import hudson.model.Descriptor;
 import hudson.model.Saveable;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 
 import java.util.List;
@@ -61,7 +62,7 @@ public class InstallSourceProperty extends ToolProperty<ToolInstallation> {
         return ToolInstallation.class;
     }
 
-    @Extension
+    @Extension @Symbol("installSource")
     public static class DescriptorImpl extends ToolPropertyDescriptor {
         public String getDisplayName() {
             return Messages.InstallSourceProperty_DescriptorImpl_displayName();

core/src/main/java/hudson/tools/JDKInstaller.java

@@ -52,6 +52,7 @@ import org.apache.commons.httpclient.methods.GetMethod;
 import org.apache.commons.httpclient.methods.PostMethod;
 import org.apache.commons.httpclient.protocol.Protocol;
 import org.apache.commons.io.IOUtils;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 import org.kohsuke.stapler.HttpResponse;
 import org.kohsuke.stapler.QueryParameter;
@@ -741,7 +742,7 @@ public class JDKInstaller extends ToolInstaller {
         return (DescriptorImpl)super.getDescriptor();
     }
 
-    @Extension
+    @Extension @Symbol("jdkInstaller")
     public static final class DescriptorImpl extends ToolInstallerDescriptor<JDKInstaller> {
         private String username;
         private Secret password;
@@ -805,7 +806,7 @@ public class JDKInstaller extends ToolInstaller {
     /**
      * JDK list.
      */
-    @Extension
+    @Extension @Symbol("jdk")
     public static final class JDKList extends Downloadable {
         public JDKList() {
             super(JDKInstaller.class);

core/src/main/java/hudson/views/GlobalDefaultViewConfiguration.java

@@ -27,6 +27,7 @@ import hudson.Extension;
 import jenkins.model.GlobalConfiguration;
 import jenkins.model.Jenkins;
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 /**
@@ -34,7 +35,7 @@ import org.kohsuke.stapler.StaplerRequest;
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension(ordinal=300)
+@Extension(ordinal=300) @Symbol("defaultView")
 public class GlobalDefaultViewConfiguration extends GlobalConfiguration {
     @Override
     public boolean configure(StaplerRequest req, JSONObject json) throws FormException {

core/src/main/java/hudson/views/LastDurationColumn.java

@@ -24,6 +24,7 @@
 package hudson.views;
 
 import hudson.Extension;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 
 public class LastDurationColumn extends ListViewColumn {
@@ -31,7 +32,7 @@ public class LastDurationColumn extends ListViewColumn {
     public LastDurationColumn() {
     }
 
-    @Extension(ordinal=DEFAULT_COLUMNS_ORDINAL_PROPERTIES_START-4)
+    @Extension(ordinal=DEFAULT_COLUMNS_ORDINAL_PROPERTIES_START-4) @Symbol("lastDuration")
     public static class DescriptorImpl extends ListViewColumnDescriptor {
         @Override
         public String getDisplayName() {

core/src/main/java/hudson/views/LastFailureColumn.java

@@ -24,6 +24,7 @@
 package hudson.views;
 
 import hudson.Extension;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 
 public class LastFailureColumn extends ListViewColumn {
@@ -31,7 +32,7 @@ public class LastFailureColumn extends ListViewColumn {
     public LastFailureColumn() {
     }
 
-    @Extension(ordinal=DEFAULT_COLUMNS_ORDINAL_PROPERTIES_START-2)
+    @Extension(ordinal=DEFAULT_COLUMNS_ORDINAL_PROPERTIES_START-2) @Symbol("lastFailure")
     public static class DescriptorImpl extends ListViewColumnDescriptor {
         @Override
         public String getDisplayName() {

core/src/main/java/hudson/views/LastStableColumn.java

@@ -24,6 +24,7 @@
 package hudson.views;
 
 import hudson.Extension;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 
 public class LastStableColumn extends ListViewColumn {
@@ -31,7 +32,7 @@ public class LastStableColumn extends ListViewColumn {
     public LastStableColumn() {
     }
 
-    @Extension(ordinal=DEFAULT_COLUMNS_ORDINAL_PROPERTIES_START-3)
+    @Extension(ordinal=DEFAULT_COLUMNS_ORDINAL_PROPERTIES_START-3) @Symbol("lastStable")
     public static class DescriptorImpl extends ListViewColumnDescriptor {
         @Override
         public String getDisplayName() {

core/src/main/java/hudson/views/LastSuccessColumn.java

@@ -24,6 +24,7 @@
 package hudson.views;
 
 import hudson.Extension;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 
 public class LastSuccessColumn extends ListViewColumn {
@@ -31,7 +32,7 @@ public class LastSuccessColumn extends ListViewColumn {
     public LastSuccessColumn() {
     }
 
-    @Extension(ordinal=DEFAULT_COLUMNS_ORDINAL_PROPERTIES_START-1)
+    @Extension(ordinal=DEFAULT_COLUMNS_ORDINAL_PROPERTIES_START-1) @Symbol("lastSuccess")
     public static class DescriptorImpl extends ListViewColumnDescriptor {
         @Override
         public String getDisplayName() {

core/src/main/java/hudson/views/MyViewsTabBar.java

@@ -32,6 +32,7 @@ import jenkins.model.GlobalConfiguration;
 import jenkins.model.Jenkins;
 import hudson.model.MyViewsProperty;
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 /**
@@ -67,7 +68,7 @@ public abstract class MyViewsTabBar extends AbstractDescribableImpl<MyViewsTabBa
      *
      * @author Kohsuke Kawaguchi
      */
-    @Extension(ordinal=305)
+    @Extension(ordinal=305) @Symbol("myView")
     public static class GlobalConfigurationImpl extends GlobalConfiguration {
         public MyViewsTabBar getMyViewsTabBar() {
             return Jenkins.getInstance().getMyViewsTabBar();

core/src/main/java/jenkins/diagnosis/HsErrPidList.java

@@ -24,13 +24,15 @@ import java.util.List;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import org.apache.commons.io.IOUtils;
+import org.jenkinsci.Symbol;
 
 /**
  * Finds crash dump reports and show them in the UI.
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension(optional=true) // TODO why would an extension using a built-in extension point need to be marked optional?
+@Extension(optional=true) @Symbol("hsErrPid")
+// TODO why would an extension using a built-in extension point need to be marked optional?
 public class HsErrPidList extends AdministrativeMonitor {
     /**
      * hs_err_pid files that we think belong to us.

core/src/main/java/jenkins/management/NodesLink.java

@@ -27,11 +27,12 @@ package jenkins.management;
 import hudson.Extension;
 import hudson.model.ManagementLink;
 import jenkins.management.Messages;
+import org.jenkinsci.Symbol;
 
 /**
  * @author <a href="mailto:nicolas.deloof@gmail.com">Nicolas De Loof</a>
  */
-@Extension(ordinal = Integer.MAX_VALUE - 1000)
+@Extension(ordinal = Integer.MAX_VALUE - 1000) @Symbol("nodes")
 public class NodesLink extends ManagementLink {
 
     @Override

core/src/main/java/jenkins/management/PluginsLink.java

@@ -26,11 +26,12 @@ package jenkins.management;
 
 import hudson.Extension;
 import hudson.model.ManagementLink;
+import org.jenkinsci.Symbol;
 
 /**
  * @author <a href="mailto:nicolas.deloof@gmail.com">Nicolas De Loof</a>
  */
-@Extension(ordinal = Integer.MAX_VALUE - 400)
+@Extension(ordinal = Integer.MAX_VALUE - 400) @Symbol("plugins")
 public class PluginsLink extends ManagementLink {
 
     @Override

core/src/main/java/jenkins/management/ReloadLink.java

@@ -26,11 +26,12 @@ package jenkins.management;
 
 import hudson.Extension;
 import hudson.model.ManagementLink;
+import org.jenkinsci.Symbol;
 
 /**
  * @author <a href="mailto:nicolas.deloof@gmail.com">Nicolas De Loof</a>
  */
-@Extension(ordinal = Integer.MAX_VALUE - 300)
+@Extension(ordinal = Integer.MAX_VALUE - 300) @Symbol("reload")
 public class ReloadLink extends ManagementLink {
 
     @Override

core/src/main/java/jenkins/model/GlobalCloudConfiguration.java

@@ -3,6 +3,7 @@ package jenkins.model;
 import hudson.Extension;
 import hudson.slaves.Cloud;
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 import java.io.IOException;
@@ -15,7 +16,7 @@ import java.io.IOException;
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension(ordinal=-100) // historically this was placed at the very end of the configuration page
+@Extension(ordinal=-100) @Symbol("cloud") // historically this was placed at the very end of the configuration page
 public class GlobalCloudConfiguration  extends GlobalConfiguration {
     @Override
     public boolean configure(StaplerRequest req, JSONObject json) throws FormException {

core/src/main/java/jenkins/model/GlobalConfigurationCategory.java

@@ -6,6 +6,7 @@ import hudson.ExtensionPoint;
 import hudson.model.ModelObject;
 import hudson.security.*;
 import hudson.security.Messages;
+import org.jenkinsci.Symbol;
 
 /**
  * Grouping of related {@link GlobalConfiguration}s.
@@ -54,7 +55,7 @@ public abstract class GlobalConfigurationCategory implements ExtensionPoint, Mod
      *
      * In the current UI, this corresponds to the /configure link.
      */
-    @Extension
+    @Extension @Symbol("unclassified")
     public static class Unclassified extends GlobalConfigurationCategory {
         @Override
         public String getShortDescription() {
@@ -69,7 +70,7 @@ public abstract class GlobalConfigurationCategory implements ExtensionPoint, Mod
     /**
      * Security related configurations.
      */
-    @Extension
+    @Extension @Symbol("security")
     public static class Security extends GlobalConfigurationCategory {
         @Override
         public String getShortDescription() {

core/src/main/java/jenkins/model/GlobalNodePropertiesConfiguration.java

@@ -4,6 +4,7 @@ import hudson.Extension;
 import hudson.slaves.NodeProperty;
 import hudson.slaves.NodePropertyDescriptor;
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 import java.io.IOException;
@@ -13,7 +14,7 @@ import java.io.IOException;
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension(ordinal=110) // historically this was placed above GlobalPluginConfiguration
+@Extension(ordinal=110) @Symbol("nodeProperties") // historically this was placed above GlobalPluginConfiguration
 public class GlobalNodePropertiesConfiguration extends GlobalConfiguration {
     @Override
     public boolean configure(StaplerRequest req, JSONObject json) throws FormException {

core/src/main/java/jenkins/model/GlobalPluginConfiguration.java

@@ -4,6 +4,7 @@ import hudson.Extension;
 import hudson.Plugin;
 import hudson.StructuredForm;
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 import javax.servlet.ServletException;
@@ -17,7 +18,7 @@ import java.io.IOException;
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension(ordinal=100) // historically this was placed above general configuration from arbitrary descriptors
+@Extension(ordinal=100) @Symbol("plugin") // historically this was placed above general configuration from arbitrary descriptors
 public class GlobalPluginConfiguration  extends GlobalConfiguration {
     @Override
     public boolean configure(StaplerRequest req, JSONObject json) throws FormException {

core/src/main/java/jenkins/model/GlobalProjectNamingStrategyConfiguration.java

@@ -27,6 +27,7 @@ import hudson.Extension;
 import jenkins.model.ProjectNamingStrategy.DefaultProjectNamingStrategy;
 import net.sf.json.JSONObject;
 
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 /**
@@ -34,7 +35,7 @@ import org.kohsuke.stapler.StaplerRequest;
  * 
  * @author Dominik Bartholdi (imod)
  */
-@Extension(ordinal = 250)
+@Extension(ordinal = 250) @Symbol("projectNamingStrategy")
 public class GlobalProjectNamingStrategyConfiguration extends GlobalConfiguration {
 
     @Override

core/src/main/java/jenkins/model/GlobalQuietPeriodConfiguration.java

@@ -25,6 +25,7 @@ package jenkins.model;
 
 import hudson.Extension;
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 import java.io.IOException;
@@ -34,7 +35,7 @@ import java.io.IOException;
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension(ordinal=400)
+@Extension(ordinal=400) @Symbol("quietPeriod")
 public class GlobalQuietPeriodConfiguration extends GlobalConfiguration {
     public int getQuietPeriod() {
         return Jenkins.getInstance().getQuietPeriod();

core/src/main/java/jenkins/model/GlobalSCMRetryCountConfiguration.java

@@ -25,6 +25,7 @@ package jenkins.model;
 
 import hudson.Extension;
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 import java.io.IOException;
@@ -34,7 +35,7 @@ import java.io.IOException;
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension(ordinal=395)
+@Extension(ordinal=395) @Symbol("scmRetryCount")
 public class GlobalSCMRetryCountConfiguration extends GlobalConfiguration {
     public int getScmCheckoutRetryCount() {
         return Jenkins.getInstance().getScmCheckoutRetryCount();

core/src/main/java/jenkins/model/IdStrategy.java

@@ -29,6 +29,7 @@ import hudson.ExtensionPoint;
 import hudson.model.AbstractDescribableImpl;
 import hudson.util.CaseInsensitiveComparator;
 import org.apache.commons.lang.StringUtils;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 
 import javax.annotation.Nonnull;
@@ -175,7 +176,7 @@ public abstract class IdStrategy extends AbstractDescribableImpl<IdStrategy> imp
             return CaseInsensitiveComparator.INSTANCE.compare(id1, id2);
         }
 
-        @Extension
+        @Extension @Symbol("caseInsensitive")
         public static class DescriptorImpl extends IdStrategyDescriptor {
 
             /**
@@ -303,7 +304,7 @@ public abstract class IdStrategy extends AbstractDescribableImpl<IdStrategy> imp
             return id1.compareTo(id2);
         }
 
-        @Extension
+        @Extension @Symbol("caseSensitive")
         public static class DescriptorImpl extends IdStrategyDescriptor {
 
             /**

core/src/main/java/jenkins/model/MasterBuildConfiguration.java

@@ -26,6 +26,7 @@ package jenkins.model;
 import hudson.Extension;
 import hudson.model.Node.Mode;
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 import java.io.IOException;
@@ -35,7 +36,7 @@ import java.io.IOException;
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension(ordinal=500)
+@Extension(ordinal=500) @Symbol("masterBuild")
 public class MasterBuildConfiguration extends GlobalConfiguration {
     public int getNumExecutors() {
         return Jenkins.getInstance().getNumExecutors();

core/src/main/java/jenkins/model/ProjectNamingStrategy.java

@@ -40,6 +40,7 @@ import java.util.regex.PatternSyntaxException;
 import javax.servlet.ServletException;
 
 import org.apache.commons.lang.StringUtils;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 import org.kohsuke.stapler.QueryParameter;
 
@@ -108,7 +109,7 @@ public abstract class ProjectNamingStrategy implements Describable<ProjectNaming
             return DEFAULT_NAMING_STRATEGY;
         }
 
-        @Extension
+        @Extension @Symbol("default")
         public static final class DescriptorImpl extends ProjectNamingStrategyDescriptor {
             @Override
             public String getDisplayName() {
@@ -174,7 +175,7 @@ public abstract class ProjectNamingStrategy implements Describable<ProjectNaming
             return forceExistingJobs;
         }
 
-        @Extension
+        @Extension @Symbol("pattern")
         public static final class DescriptorImpl extends ProjectNamingStrategyDescriptor {
 
             public static final String DEFAULT_PATTERN = ".*";

core/src/main/java/jenkins/mvn/GlobalMavenConfig.java

@@ -4,10 +4,11 @@ import hudson.Extension;
 import jenkins.model.GlobalConfiguration;
 import net.sf.json.JSONObject;
 
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 //as close as it gets to the global Maven Project configuration
-@Extension(ordinal = 50)
+@Extension(ordinal = 50) @Symbol("maven")
 public class GlobalMavenConfig extends GlobalConfiguration {
     private SettingsProvider settingsProvider;
     private GlobalSettingsProvider globalSettingsProvider;

core/src/main/java/jenkins/security/LastGrantedAuthoritiesProperty.java

@@ -12,6 +12,7 @@ import org.acegisecurity.Authentication;
 import org.acegisecurity.GrantedAuthority;
 import org.acegisecurity.GrantedAuthorityImpl;
 import org.acegisecurity.userdetails.UserDetails;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 import javax.annotation.Nonnull;
@@ -146,7 +147,7 @@ public class LastGrantedAuthoritiesProperty extends UserProperty {
         }
     }
 
-    @Extension
+    @Extension @Symbol("lastGrantedAuthorities")
     public static final class DescriptorImpl extends UserPropertyDescriptor {
         @Override
         public boolean isEnabled() {

core/src/main/java/jenkins/security/QueueItemAuthenticatorConfiguration.java

@@ -7,6 +7,7 @@ import jenkins.model.GlobalConfiguration;
 import jenkins.model.GlobalConfigurationCategory;
 import jenkins.model.Jenkins;
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.StaplerRequest;
 
 import java.io.IOException;
@@ -18,7 +19,7 @@ import java.util.List;
  * @author Kohsuke Kawaguchi
  * @since 1.520
  */
-@Extension
+@Extension @Symbol("queueItemAuthenticator")
 public class QueueItemAuthenticatorConfiguration extends GlobalConfiguration {
     private final DescribableList<QueueItemAuthenticator,QueueItemAuthenticatorDescriptor> authenticators
         = new DescribableList<QueueItemAuthenticator, QueueItemAuthenticatorDescriptor>(this);

core/src/main/java/jenkins/security/RekeySecretAdminMonitor.java

@@ -10,6 +10,7 @@ import hudson.util.VersionNumber;
 import jenkins.management.AsynchronousAdministrativeMonitor;
 import jenkins.model.Jenkins;
 import jenkins.util.io.FileBoolean;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.HttpResponse;
 import org.kohsuke.stapler.StaplerProxy;
 import org.kohsuke.stapler.StaplerRequest;
@@ -28,7 +29,7 @@ import java.util.logging.Logger;
  *
  * @author Kohsuke Kawaguchi
  */
-@Extension
+@Extension @Symbol("rekeySecret")
 public class RekeySecretAdminMonitor extends AsynchronousAdministrativeMonitor implements StaplerProxy {
 
     /**

core/src/main/java/jenkins/slaves/JnlpSlaveAgentProtocol.java

@@ -11,6 +11,7 @@ import jenkins.AgentProtocol;
 import jenkins.model.Jenkins;
 import jenkins.security.ChannelConfigurator;
 import jenkins.security.HMACConfidentialKey;
+import org.jenkinsci.Symbol;
 import org.jenkinsci.remoting.nio.NioChannelHub;
 
 import javax.inject.Inject;
@@ -52,7 +53,7 @@ import java.util.logging.Logger;
  * @author Kohsuke Kawaguchi
  * @since 1.467
  */
-@Extension
+@Extension @Symbol("jnlp")
 public class JnlpSlaveAgentProtocol extends AgentProtocol {
     @Inject
     NioChannelSelector hub;

core/src/main/java/jenkins/slaves/JnlpSlaveAgentProtocol2.java

 package jenkins.slaves;
 
 import hudson.Extension;
+import org.jenkinsci.Symbol;
 import org.jenkinsci.remoting.nio.NioChannelHub;
 
 import java.io.ByteArrayInputStream;
@@ -18,7 +19,7 @@ import java.net.Socket;
  * @author Kohsuke Kawaguchi
  * @since 1.467
  */
-@Extension
+@Extension @Symbol("jnlp2")
 public class JnlpSlaveAgentProtocol2 extends JnlpSlaveAgentProtocol {
     @Override
     public String getName() {