title: Endeca Preview :: javax.servlet.ServletException: javax.jcr.PathNotFoundException: previewUrl (500)
body: <p>While accessing the <strong>Preview Settings</strong> of an app in Endeca Workbench, the following error is thrown: <em>(This issue is happening when the Preview settings' textbox is stored with empty string accidentally)</em>. Any workaround to fix this issue?
  [Environment: Endeca 3.1.2, ATG 10.2, Linux]
  <img src="https://i.stack.imgur.com/Mc4z0.png" alt="enter image description here"></p>
  
  <pre><code>javax.servlet.ServletException: javax.jcr.PathNotFoundException: previewUrl (500)
  The requested URL /ifcr/sites/MyEndecaApp/configuration/tools/preview.html resulted in an error in /apps/endeca/preview/html.jsp.
  Exception:
  org.apache.sling.api.SlingException: javax.servlet.ServletException: javax.jcr.PathNotFoundException: previewUrl
          at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.handleJspExceptionInternal(JspServletWrapper.java:560)
          at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:496)
          at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:442)
          at org.apache.sling.scripting.jsp.JspServletWrapperAdapter.service(JspServletWrapperAdapter.java:59)
          at org.apache.sling.scripting.jsp.JspScriptEngineFactory.callJsp(JspScriptEngineFactory.java:173)
          at org.apache.sling.scripting.jsp.JspScriptEngineFactory.access$100(JspScriptEngineFactory.java:84)
          at org.apache.sling.scripting.jsp.JspScriptEngineFactory$JspScriptEngine.eval(JspScriptEngineFactory.java:388)
          at org.apache.sling.scripting.core.impl.DefaultSlingScript.call(DefaultSlingScript.java:358)
          at org.apache.sling.scripting.core.impl.DefaultSlingScript.eval(DefaultSlingScript.java:170)
          at org.apache.sling.scripting.core.impl.DefaultSlingScript.service(DefaultSlingScript.java:456)
          at org.apache.sling.engine.impl.request.RequestData.service(RequestData.java:529)
          at org.apache.sling.engine.impl.filter.SlingComponentFilterChain.render(SlingComponentFilterChain.java:45)
          at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:64)
          at com.endeca.ifcr.servlets.post.ConflictDetectionFilter.doFilter(ConflictDetectionFilter.java:217)
          at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
          at org.apache.sling.engine.impl.SlingRequestProcessorImpl.processComponent(SlingRequestProcessorImpl.java:269)
          at org.apache.sling.engine.impl.filter.RequestSlingFilterChain.render(RequestSlingFilterChain.java:49)
          at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:64)
          at com.endeca.workbench.filters.RootFilter.doFilter(RootFilter.java:84)
          at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
          at com.endeca.workbench.filters.NoCacheFilter.doFilter(NoCacheFilter.java:56)
          at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
          at com.endeca.workbench.filters.LastVisitedFilter.doFilter(LastVisitedFilter.java:50)
          at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
          at com.endeca.workbench.filters.AccessFilter.doFilter(AccessFilter.java:54)
          at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
          at com.endeca.ifcr.filters.NoSuchPrincipalFilter.doFilter(NoSuchPrincipalFilter.java:84)
          at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
          at com.endeca.ifcr.servlets.get.WorkbenchRedirectFilter.doFilter(WorkbenchRedirectFilter.java:102)
          at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
          at com.endeca.ifcr.servlets.get.CacheControlFilter.doFilter(CacheControlFilter.java:91)
          at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
          at org.apache.sling.engine.impl.debug.RequestProgressTrackerLogFilter.doFilter(RequestProgressTrackerLogFilter.java:59)
          at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
          at org.apache.sling.i18n.impl.I18NFilter.doFilter(I18NFilter.java:101)
          at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
          at org.apache.sling.engine.impl.SlingRequestProcessorImpl.processRequest(SlingRequestProcessorImpl.java:161)
          at org.apache.sling.engine.impl.SlingMainServlet.service(SlingMainServlet.java:183)
          at org.apache.felix.http.base.internal.handler.ServletHandler.doHandle(ServletHandler.java:96)
          at org.apache.felix.http.base.internal.handler.ServletHandler.handle(ServletHandler.java:79)
          at org.apache.felix.http.base.internal.dispatch.ServletPipeline.handle(ServletPipeline.java:42)
          at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:49)
          at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:33)
          at com.endeca.workbench.ready.WorkbenchReadyFilter.doFilter(WorkbenchReadyFilter.java:174)
          at org.apache.felix.http.base.internal.handler.FilterHandler.doHandle(FilterHandler.java:88)
          at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:76)
          at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:47)
          at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:33)
          at org.apache.felix.http.base.internal.dispatch.FilterPipeline.dispatch(FilterPipeline.java:48)
          at org.apache.felix.http.base.internal.dispatch.Dispatcher.dispatch(Dispatcher.java:39)
          at org.apache.felix.http.base.internal.DispatcherServlet.service(DispatcherServlet.java:67)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
          at org.apache.felix.http.proxy.ProxyServlet.service(ProxyServlet.java:60)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
          at org.apache.sling.launchpad.base.webapp.SlingServletDelegate.service(SlingServletDelegate.java:277)
          at org.apache.sling.launchpad.webapp.SlingServlet.service(SlingServlet.java:148)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
          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:191)
          at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
          at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
          at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:554)
          at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
          at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
          at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
          at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
          at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
          at java.lang.Thread.run(Thread.java:619)
  Caused by: javax.jcr.PathNotFoundException: previewUrl
          at org.apache.jackrabbit.core.NodeImpl.getProperty(NodeImpl.java:2523)
          at org.apache.jsp.apps.endeca.preview.html_jsp._jspService(html_jsp.java:151)
          at org.apache.sling.scripting.jsp.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
          at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
          ... 66 more
  Request Progress:
        0 (2013-04-17 06:03:23) TIMER_START{Request Processing}
        0 (2013-04-17 06:03:23) COMMENT timer_end format is {&lt;elapsed msec&gt;,&lt;timer name&gt;} &lt;optional message&gt;
        0 (2013-04-17 06:03:23) LOG Method=GET, PathInfo=/sites/MyEndecaApp/configuration/tools/preview.html
        0 (2013-04-17 06:03:23) TIMER_START{ResourceResolution}
        0 (2013-04-17 06:03:23) TIMER_END{0,ResourceResolution} URI=/ifcr/sites/MyEndecaApp/configuration/tools/preview.html resolves to Resource=JcrNodeResource, type=endeca/preview, superType=null, path=/sites/MyEndecaApp/configuration/tools/preview
        0 (2013-04-17 06:03:23) LOG Resource Path Info: SlingRequestPathInfo: path='/sites/MyEndecaApp/configuration/tools/preview', selectorString='null', extension='html', suffix='null'
        0 (2013-04-17 06:03:23) TIMER_START{ServletResolution}
        0 (2013-04-17 06:03:23) TIMER_START{resolveServlet(JcrNodeResource, type=endeca/preview, superType=null, path=/sites/MyEndecaApp/configuration/tools/preview)}
        0 (2013-04-17 06:03:23) TIMER_END{0,resolveServlet(JcrNodeResource, type=endeca/preview, superType=null, path=/sites/MyEndecaApp/configuration/tools/preview)} Using servlet /apps/endeca/preview/html.jsp
        0 (2013-04-17 06:03:23) TIMER_END{0,ServletResolution} URI=/ifcr/sites/MyEndecaApp/configuration/tools/preview.html handled by Servlet=/apps/endeca/preview/html.jsp
        0 (2013-04-17 06:03:23) LOG Applying Requestfilters
        1 (2013-04-17 06:03:23) LOG Calling filter: org.apache.sling.i18n.impl.I18NFilter
        1 (2013-04-17 06:03:23) LOG Calling filter: org.apache.sling.engine.impl.debug.RequestProgressTrackerLogFilter
        1 (2013-04-17 06:03:23) LOG Calling filter: com.endeca.ifcr.servlets.get.CacheControlFilter
        1 (2013-04-17 06:03:23) LOG Calling filter: com.endeca.ifcr.servlets.get.WorkbenchRedirectFilter
        1 (2013-04-17 06:03:23) LOG Calling filter: com.endeca.ifcr.filters.NoSuchPrincipalFilter
        1 (2013-04-17 06:03:23) LOG Calling filter: com.endeca.workbench.filters.AccessFilter
        5 (2013-04-17 06:03:23) LOG Calling filter: com.endeca.workbench.filters.LastVisitedFilter
       11 (2013-04-17 06:03:23) LOG Calling filter: com.endeca.workbench.filters.NoCacheFilter
       11 (2013-04-17 06:03:23) LOG Calling filter: com.endeca.workbench.filters.RootFilter
       11 (2013-04-17 06:03:23) LOG Applying Componentfilters
       11 (2013-04-17 06:03:23) LOG Calling filter: com.endeca.ifcr.servlets.post.ConflictDetectionFilter
       11 (2013-04-17 06:03:23) TIMER_START{/apps/endeca/preview/html.jsp#0}
       12 (2013-04-17 06:03:23) LOG SCRIPT ERROR: javax.servlet.ServletException: javax.jcr.PathNotFoundException: previewUrl
       12 (2013-04-17 06:03:23) TIMER_END{1,/apps/endeca/preview/html.jsp#0}
       13 (2013-04-17 06:03:23) TIMER_START{handleError:throwable=org.apache.sling.api.SlingException}
       16 (2013-04-17 06:03:23) TIMER_END{3,handleError:throwable=org.apache.sling.api.SlingException} Using handler org.apache.sling.servlets.resolver.internal.defaults.DefaultErrorHandlerServlet
       18 (2013-04-17 06:03:23) TIMER_END{18,Request Processing} Dumping SlingRequestProgressTracker Entries
  ________________________________________
  ApacheSling/2.2 (Java HotSpot(TM) 64-Bit Server VM 1.6.0_17; Linux 2.6.18-238.el5 amd64)
  </code></pre>