title: strange "String index out of range: 0" error
body: <p>I have a huge application and at some point, when a redirect is involved i received this strange error:</p>
  
  <pre><code>Caused by java.lang.StringIndexOutOfBoundsException with message: "String index out of range: 0"    
  java.lang.String.charAt(String.java:687)
  com.sun.faces.application.ViewHandlerImpl.getActionURL(ViewHandlerImpl.java:652)
  org.jboss.seam.jsf.SeamViewHandler.getActionURL(SeamViewHandler.java:74)
  com.sun.facelets.FaceletViewHandler.getActionURL(FaceletViewHandler.java:803)
  org.ajax4jsf.application.ViewHandlerWrapper.getActionURL(ViewHandlerWrapper.java:86)
  org.jboss.seam.ui.util.ViewUrlBuilder.&lt;init&gt;(ViewUrlBuilder.java:25)
  org.jboss.seam.ui.component.UISeamCommandBase.getUrl(UISeamCommandBase.java:48)
  org.jboss.seam.ui.renderkit.LinkRendererBase.doEncodeBegin(LinkRendererBase.java:26)
  org.jboss.seam.ui.util.cdk.RendererBase.encodeBegin(RendererBase.java:79)
  javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:813)
  javax.faces.component.UIComponent.encodeAll(UIComponent.java:934)
  javax.faces.component.UIComponent.encodeAll(UIComponent.java:942)
  javax.faces.component.UIComponent.encodeAll(UIComponent.java:942)
  com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592)
  org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)
  org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)
  com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:109)
  com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
  com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
  javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
  org.jboss.seam.web.RewriteFilter.doFilter(RewriteFilter.java:63)
  org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40)
  org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90)
  org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
  org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
  org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:73)
  org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)
  org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
  org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
  org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
  org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56)
  org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60)
  org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53)
  org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
  org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
  org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
  org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
  org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
  org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
  org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
  org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
  org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
  org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
  org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
  org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
  org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
  java.lang.Thread.run(Thread.java:619)
  </code></pre>
  
  <p>I've spent two hours debugging and so on, but did not find any clue...
  It's just weird because the error log does not tell something clear...(which string, which property is involved etc).</p>
  
  <p>Does anyone can guess something more from the stacktrace?</p>
  
  <p>Thanks.</p>