Hi,
I am getting a stack overflow error in Spring Web Flow when the attributemapper contains an object which implements the Map interface which has a cyclical relationship with another object also implementing the Map interface. The stack overflow trace starts in a log.debug statement in Spring Web Flow:
logger.debug("Activating new session for flow '" + flow.getId() + "' in state '"
+ flow.getStartState().getId() + "' with input " + input);

The input is a LocalAttributeMap. The toString of input ends up in the Spring DefaultValueStyler which (afaics) is not able to handle cyclical relations.

I put a breakpoint to show the start of the stacktrace. Below you can find the the start of the stacktrace resulting in a stack overflow, further below you can find the end (ending in a stack overflow).

Is there a way for me to prevent this. Is there a mode in which the DefaultValueStyyler can be run so that it prevents infinite looping?

Thanks for any response on this.

gr. Martin

>>>> Start of stack overflow stack trace:
EcoreDynamicObject.entrySet() line: 268
DefaultValueStyler.visit(Map) line: 78
GeneratedMethodAccessor69.invoke(Object, Object[]) line: not available
DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25
Method.invoke(Object, Object...) line: 585
ReflectiveVisitorHelper.invokeVisit(Object, Object) line: 97
DefaultValueStyler.style(Object) line: 56
DefaultValueStyler.visit(Map$Entry) line: 93
GeneratedMethodAccessor73.invoke(Object, Object[]) line: not available
DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25
Method.invoke(Object, Object...) line: 585
ReflectiveVisitorHelper.invokeVisit(Object, Object) line: 97
DefaultValueStyler.style(Object) line: 56
DefaultValueStyler.visit(Map) line: 80
GeneratedMethodAccessor69.invoke(Object, Object[]) line: not available
DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25
Method.invoke(Object, Object...) line: 585
ReflectiveVisitorHelper.invokeVisit(Object, Object) line: 97
DefaultValueStyler.style(Object) line: 56
StylerUtils.style(Object) line: 47
LocalAttributeMap.toString() line: 316
String.valueOf(Object) line: 2577
StringBuffer.append(Object) line: 220
RequestControlContextImpl.start(Flow, MutableAttributeMap) line: 190
SubflowState.doEnter(RequestControlContext) line: 120
SubflowState(State).enter(RequestControlContext) line: 200
Transition.execute(State, RequestControlContext) line: 229
ViewState(TransitionableState).onEvent(RequestCont rolContext) line: 112
Flow.onEvent(RequestControlContext) line: 572
RequestControlContextImpl.signalEvent(Event) line: 208
FlowExecutionImpl.signalEvent(String, ExternalContext) line: 217
FlowNavigationHandler.handleNavigation(FacesContex t, String, String, NavigationHandler) line: 184
FlowNavigationHandler(DecoratingNavigationHandler) .handleNavigation(FacesContext, String, String) line: 72
ActionListenerImpl.processAction(ActionEvent) line: 119
HtmlCommandLink(UICommand).broadcast(FacesEvent) line: 383
HtmlDataTable(UIDataAdaptor).broadcast(FacesEvent) line: 1172
AjaxViewRoot.processEvents(Buffer, boolean) line: 186
AjaxViewRoot.broadcastEvents(FacesContext, PhaseId) line: 164
AjaxViewRoot.processDecodes(FacesContext) line: 280
ApplyRequestValuesPhase.execute(FacesContext) line: 101
LifecycleImpl.phase(PhaseId, Phase, FacesContext) line: 251
LifecycleImpl.execute(FacesContext) line: 117
FacesServlet.service(ServletRequest, ServletResponse) line: 244
ApplicationFilterChain.internalDoFilter(ServletReq uest, ServletResponse) line: 290
ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 206
ExtensionsFilter.doFilter(ServletRequest, ServletResponse, FilterChain) line: 100
ApplicationFilterChain.internalDoFilter(ServletReq uest, ServletResponse) line: 235
ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 206
ConfigurableXMLFilter(BaseXMLFilter).doXmlFilter(F ilterChain, HttpServletRequest, HttpServletResponse) line: 141
Filter(BaseFilter).doFilter(ServletRequest, ServletResponse, FilterChain) line: 281
ApplicationFilterChain.internalDoFilter(ServletReq uest, ServletResponse) line: 235
ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 206
ExtensionsFilter.doFilter(ServletRequest, ServletResponse, FilterChain) line: 147
ApplicationFilterChain.internalDoFilter(ServletReq uest, ServletResponse) line: 235
ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 206
FlowSystemCleanupFilter.doFilterInternal(HttpServl etRequest, HttpServletResponse, FilterChain) line: 41
FlowSystemCleanupFilter(OncePerRequestFilter).doFi lter(ServletRequest, ServletResponse, FilterChain) line: 75
ApplicationFilterChain.internalDoFilter(ServletReq uest, ServletResponse) line: 235
ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 206
StandardWrapperValve.invoke(Request, Response) line: 230
StandardContextValve.invoke(Request, Response) line: 175
StandardHostValve.invoke(Request, Response) line: 128
ErrorReportValve.invoke(Request, Response) line: 104
StandardEngineValve.invoke(Request, Response) line: 109
CoyoteAdapter.service(Request, Response) line: 261
Http11Processor.process(Socket) line: 844
Http11Protocol$Http11ConnectionHandler.process(Soc ket) line: 581
JIoEndpoint$Worker.run() line: 447
Thread.run() line: 595


>>> Last part of the stack overflow:

java.lang.StackOverflowError
java.lang.Integer.toString(Integer.java:303)
java.lang.Integer.toString(Integer.java:116)
java.lang.String.valueOf(String.java:2682)
java.lang.Integer.toString(Integer.java:682)
java.lang.String.valueOf(String.java:2577)
org.springframework.core.style.DefaultValueStyler. visit(DefaultValueStyler.java:64)
sun.reflect.GeneratedMethodAccessor75.invoke(Unkno wn Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:585)
org.springframework.core.ReflectiveVisitorHelper.i nvokeVisit(ReflectiveVisitorHelper.java:97)
org.springframework.core.style.DefaultValueStyler. style(DefaultValueStyler.java:56)
org.springframework.core.style.DefaultValueStyler. visit(DefaultValueStyler.java:93)
sun.reflect.GeneratedMethodAccessor73.invoke(Unkno wn Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:585)
org.springframework.core.ReflectiveVisitorHelper.i nvokeVisit(ReflectiveVisitorHelper.java:97)