In Contact app for example, when creating a new Contact, press save without typing anything, and then navigate to the next error ....

-------------------------com.vaadin.server.ServerRpcManager$RpcInvocationException: Unable to invoke method focusNextProblematicField in info.magnolia.ui.vaadin.gwt.client.form.rpc.FormServerRpc
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:172)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:118)
at com.vaadin.server.AbstractCommunicationManager.handleBurst(AbstractCommunicationManager.java:1678)
at com.vaadin.server.AbstractCommunicationManager.handleVariables(AbstractCommunicationManager.java:1564)
at com.vaadin.server.AbstractCommunicationManager.handleUidlRequest(AbstractCommunicationManager.java:582)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:315)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:201)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at info.magnolia.cms.filters.ServletDispatchingFilter.doFilter(ServletDispatchingFilter.java:123)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:67)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:70)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.module.cache.executor.Bypass.processCacheRequest(Bypass.java:58)
at info.magnolia.module.cache.executor.CompositeExecutor.processCacheRequest(CompositeExecutor.java:66)
at info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:153)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:76)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.filters.RangeSupportFilter.doFilter(RangeSupportFilter.java:84)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:60)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.security.SecurityCallbackFilter.doFilter(SecurityCallbackFilter.java:86)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:93)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.module.templatingkit.filters.SiteMergeFilter.doFilter(SiteMergeFilter.java:99)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.filters.MultiChannelFilter.doFilter(MultiChannelFilter.java:83)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:75)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:93)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
at info.magnolia.module.devicedetection.filter.DeviceDetectionFilter.doFilter(DeviceDetectionFilter.java:73)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:102)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:131)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:67)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
at info.magnolia.cms.filters.SafeDestroyMgnlFilterWrapper.doFilter(SafeDestroyMgnlFilterWrapper.java:108)
at info.magnolia.cms.filters.MgnlFilterDispatcher.doDispatch(MgnlFilterDispatcher.java:67)
at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:108)
at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:94)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:170)
... 89 more
Caused by: java.lang.StackOverflowError
at java.util.regex.Pattern$Curly.match(Pattern.java:3737)
at java.util.regex.Pattern$GroupHead.match(Pattern.java:4168)
at java.util.regex.Pattern$Loop.match(Pattern.java:4295)
at java.util.regex.Pattern$GroupTail.match(Pattern.java:4227)
at java.util.regex.Pattern$Curly.match0(Pattern.java:3782)
at java.util.regex.Pattern$Curly.match(Pattern.java:3744)
at java.util.regex.Pattern$GroupHead.match(Pattern.java:4168)
at java.util.regex.Pattern$Loop.matchInit(Pattern.java:4311)
at java.util.regex.Pattern$Prolog.match(Pattern.java:4251)
at java.util.regex.Pattern$Loop.match(Pattern.java:4304)
at java.util.regex.Pattern$GroupTail.match(Pattern.java:4227)
at java.util.regex.Pattern$BmpCharProperty.match(Pattern.java:3366)
at java.util.regex.Pattern$GroupCurly.match0(Pattern.java:3972)
at java.util.regex.Pattern$GroupCurly.match(Pattern.java:3916)
at java.util.regex.Pattern$GroupHead.match(Pattern.java:4168)
at java.util.regex.Pattern$Loop.matchInit(Pattern.java:4311)
at java.util.regex.Pattern$Prolog.match(Pattern.java:4251)
at java.util.regex.Pattern$BmpCharProperty.match(Pattern.java:3366)
at java.util.regex.Pattern$GroupCurly.match0(Pattern.java:3972)
at java.util.regex.Pattern$GroupCurly.match(Pattern.java:3916)
at java.util.regex.Pattern$Begin.match(Pattern.java:3120)
at java.util.regex.Matcher.match(Matcher.java:1127)
at java.util.regex.Matcher.matches(Matcher.java:502)
at com.vaadin.data.validator.RegexpValidator.isValidValue(RegexpValidator.java:93)
at com.vaadin.data.validator.RegexpValidator.isValidValue(RegexpValidator.java:42)
at com.vaadin.data.validator.AbstractValidator.validate(AbstractValidator.java:100)
at com.vaadin.ui.AbstractField.validate(AbstractField.java:935)
at com.vaadin.ui.AbstractField.validate(AbstractField.java:900)
at com.vaadin.ui.AbstractField.isValid(AbstractField.java:873)
at info.magnolia.ui.vaadin.form.FormSection.getNextProblematicField(FormSection.java:144)