NPE on sort

[tmonkowius]

Hi, sporadically I find this stack within our production log. When I sort within the sortable it works, but somehow the sortable item is sometimes null. Any ideas what could be the reason?

groupId=com.googlecode.wicket-jquery-ui artifactId=wicket-jquery-ui-core version=9.18.0

Exception: java.lang.NullPointerException at com.googlecode.wicket.jquery.core.utils.ListUtils.move(ListUtils.java:177) at com.googlecode.wicket.jquery.ui.interaction.sortable.Sortable.onUpdate(Sortable.java:137) at com.googlecode.wicket.jquery.ui.interaction.sortable.SortableBehavior.onAjax(SortableBehavior.java:180) at com.googlecode.wicket.jquery.core.ajax.JQueryAjaxBehavior.respond(JQueryAjaxBehavior.java:174) at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:630) at org.apache.wicket.core.request.handler.ListenerRequestHandler.internalInvoke(ListenerRequestHandler.java:300) at org.apache.wicket.core.request.handler.ListenerRequestHandler.invoke(ListenerRequestHandler.java:274) at org.apache.wicket.core.request.handler.ListenerRequestHandler.invokeListener(ListenerRequestHandler.java:222) at org.apache.wicket.core.request.handler.ListenerRequestHandler.respond(ListenerRequestHandler.java:202) at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:910) at org.apache.wicket.request.RequestHandlerExecutor.execute(RequestHandlerExecutor.java:63) at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:294) at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:255) at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:277) at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:208) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:307) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:253) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:211) at com.ccc.yap.presentation.frontend.configuration.spring.LoggingFilter.doFilter(LoggingFilter.java:73) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:253) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:211) at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:65) at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:109) at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:138) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:156) at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:70) at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:109) at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:138) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:156) at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:70) at org.pac4j.jee.filter.SecurityFilter.lambda$internalFilter$0(SecurityFilter.java:94) at org.pac4j.core.engine.DefaultSecurityLogic.perform(DefaultSecurityLogic.java:160) at org.pac4j.jee.filter.SecurityFilter.internalFilter(SecurityFilter.java:92) at org.pac4j.jee.config.AbstractConfigFilter.doFilter(AbstractConfigFilter.java:72) at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:70) at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:463) at org.apache.shiro.web.servlet.AbstractShiroFilter.lambda$doFilterInternal$0(AbstractShiroFilter.java:378) at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:91) at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:84) at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:389) at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:376) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:156) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267) at com.ccc.yap.presentation.frontend.configuration.spring.SpringInitializer$1.doFilter(SpringInitializer.java:145) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:253) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:211) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.jav...

[martin-g]

The project has been moved to https://github.com/wicketstuff/core/tree/master/wicketstuff-jquery-ui-parent