net.sf.json.JSONException: There is a cycle in the hierarchy!
	at net.sf.json.util.CycleDetectionStrategy$StrictCycleDetectionStrategy.handleRepeatedReferenceAsObject(CycleDetectionStrategy.java:97)
	at net.sf.json.JSONObject._fromBean(JSONObject.java:600)
	at net.sf.json.JSONObject.fromObject(JSONObject.java:169)
	at net.sf.json.AbstractJSON._processValue(AbstractJSON.java:250)
	at net.sf.json.JSONObject._processValue(JSONObject.java:2599)
	at net.sf.json.JSONObject.processValue(JSONObject.java:2665)
	at net.sf.json.JSONObject.setInternal(JSONObject.java:2680)
	at net.sf.json.JSONObject.setValue(JSONObject.java:1376)
	at net.sf.json.JSONObject.defaultBeanProcessing(JSONObject.java:708)
	at net.sf.json.JSONObject._fromBean(JSONObject.java:642)
	at net.sf.json.JSONObject.fromObject(JSONObject.java:169)
	at org.kohsuke.stapler.HttpResponseRenderer$Default.handleJavaScriptProxyMethodCall(HttpResponseRenderer.java:89)
	at org.kohsuke.stapler.HttpResponseRenderer$Default.generateResponse(HttpResponseRenderer.java:64)
	at org.kohsuke.stapler.Function.renderResponse(Function.java:112)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:614)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:799)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:587)
	at org.kohsuke.stapler.Stapler.service(Stapler.java:218)