https://issues.jenkins-ci.org/browse/JENKINS-22624

Fixing compatibility issue.
Fixes #2

pom.xml

@@ -3,7 +3,8 @@
   <parent>
     <groupId>org.jenkins-ci.plugins</groupId>
     <artifactId>plugin</artifactId>
-    <version>1.551</version><!-- which version of Jenkins is this plugin built against? -->
+    <!-- <version>1.551</version> -->
+    <version>1.532.1</version> 
   </parent>
 
   <artifactId>categorized-view</artifactId>

src/main/java/org/jenkinsci/plugins/categorizedview/CategorizedJobsView.java

@@ -2,19 +2,20 @@
 
 import hudson.Extension;
 import hudson.Util;
+import hudson.model.TopLevelItem;
+import hudson.model.ViewGroup;
 import hudson.model.Descriptor;
 import hudson.model.Descriptor.FormException;
 import hudson.model.ListView;
-import hudson.model.TopLevelItem;
 import hudson.model.ViewDescriptor;
-import hudson.model.ViewGroup;
 import hudson.util.CaseInsensitiveComparator;
 import hudson.util.DescribableList;
 import hudson.util.FormValidation;
 import hudson.views.ListViewColumn;
 
 import java.io.IOException;
 import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.List;
@@ -95,9 +96,16 @@ public void migrateOldFormat() {
 
 	@Override
 	protected void submit(StaplerRequest req) throws ServletException, FormException, IOException {
+		forcefullyDisableRecurseBecauseItCausesClassCastExceptionOnJenkins1_532_1(req);
 		super.submit(req);
 		categorizationCriteria.rebuildHetero(req, req.getSubmittedForm(), CategorizationCriteria.all(), "categorizationCriteria");
 	}
+
+
+	public void forcefullyDisableRecurseBecauseItCausesClassCastExceptionOnJenkins1_532_1(
+			StaplerRequest req) {
+		req.setAttribute("recurse", false);
+	}
 
     public DescribableList<CategorizationCriteria, Descriptor<CategorizationCriteria>> getCategorizationCriteria() {
     	migrateOldFormat();

src/main/resources/lib/categorizedview/catProjectViewRow.jelly

@@ -46,7 +46,7 @@ THE SOFTWARE.
 	  	onClick="toggleJobGroupVisibility('${view.getViewName()}','${view.getGroupClassFor(job)}')">
 	  	<td>
 		  	<span id="handle_${view.getGroupClassFor(job)}">
-			   <img class="icon16x16" src="${rootURL}/images/16x16/collapse.png"/> 
+			   <img class="icon16x16" src="${rootURL}/plugin/categorized-view/images/collapse.png"/> 
 			</span>
 			<script type="text/javascript">
 				document.observe("dom:loaded", function() {

src/main/resources/org/jenkinsci/plugins/categorizedview/CategorizedJobsView/main.groovy

@@ -3,7 +3,7 @@ package hudson.model.View;
 t=namespace(lib.CategorizedviewTagLib)
 st=namespace("jelly:stapler")
 
-if (items.isEmpty()) {
+if (my.groupedItems.isEmpty()) {
     if (app.items.size() != 0) {
         set("views",my.owner.views);
         set("currentView",my);