title: AEM 6.2 cq:dialog Image upload preview not working
body: <p>This is my first AEM project, I have a image upload in a component which is working, after uploading if i open settings of component to change the image, preview is not working as you can see in below picture.</p>
  
  <p><a href="https://i.stack.imgur.com/QmZnY.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/QmZnY.jpg" alt="enter image description here"></a> </p>
  
  <p><strong>cq:dialog banner file upload properties</strong> 
  <a href="https://i.stack.imgur.com/s6mj1.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/s6mj1.jpg" alt="enter image description here"></a></p>
  
  <p>If i try to open image with <code>/content/xxxDetails/xxx/_jcr_content/par/banner/bannerImage</code> i can able to access image.</p>
  
  <p>How do i fix the preview problem, I thing it's basic question but please help me  as this is my first project.</p>
  
  <p><strong>EDIT: cq:dialog</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:cq="http://www.day.com/jcr/cq/1.0" xmlns:jcr="http://www.jcp.org/jcr/1.0" xmlns:nt="http://www.jcp.org/jcr/nt/1.0"
      jcr:primaryType="nt:unstructured"
      jcr:title="Properties"
      sling:resourceType="cq/gui/components/authoring/dialog"&gt;
      &lt;content
          jcr:primaryType="nt:unstructured"
          sling:resourceType="granite/ui/components/foundation/container"&gt;
          &lt;layout
              jcr:primaryType="nt:unstructured"
              sling:resourceType="granite/ui/components/foundation/layouts/tabs"
              type="nav"/&gt;
          &lt;items jcr:primaryType="nt:unstructured"&gt;
              &lt;banner
                  jcr:primaryType="nt:unstructured"
                  jcr:title="Banner Properties"
                  sling:resourceType="granite/ui/components/foundation/section"&gt;
                  &lt;layout
                      jcr:primaryType="nt:unstructured"
                      sling:resourceType="granite/ui/components/foundation/layouts/fixedcolumns"/&gt;
                  &lt;items jcr:primaryType="nt:unstructured"&gt;
                      &lt;columns
                          jcr:primaryType="nt:unstructured"
                          sling:resourceType="granite/ui/components/foundation/container"&gt;
                          &lt;items jcr:primaryType="nt:unstructured"&gt;
                              &lt;headerText
                                  jcr:primaryType="nt:unstructured"
                                  sling:resourceType="granite/ui/components/foundation/form/textfield"
                                  fieldLabel="Heading Text"
                                  name="./header"/&gt;
                              &lt;SubText
                                  jcr:primaryType="nt:unstructured"
                                  sling:resourceType="granite/ui/components/foundation/form/textarea"
                                  fieldLabel="SubHeading"
                                  name="./subtext"/&gt;
                              &lt;bannerImage
                                  jcr:primaryType="nt:unstructured"
                                  sling:resourceType="granite/ui/components/foundation/form/fileupload"
                                  autoStart="{Boolean}false"
                                  class="cq-droptarget"
                                  fieldLabel="Banner"
                                  fileNameParameter="./bannerImgName"
                                  fileReferenceParameter="./bannerImgRef"
                                  mimeTypes="[image]"
                                  multiple="{Boolean}false"
                                  name="./bannerImage"
                                  title="Upload Image"
                                  uploadUrl="${suffix.path}"
                                  useHTML5="{Boolean}true"/&gt;
                          &lt;/items&gt;
                      &lt;/columns&gt;
                  &lt;/items&gt;
              &lt;/banner&gt;
          &lt;/items&gt;
      &lt;/content&gt;
  &lt;/jcr:root&gt;
  </code></pre>
  
  <p>Error Logs</p>
  
  <pre><code>09.05.2017 18:29:15.949 *ERROR* [0:0:0:0:0:0:0:1 [1494334755944] POST /content/xxxDetails/xxx/_jcr_content/par/banner HTTP/1.1] org.apache.sling.servlets.post.impl.operations.ModifyOperation Exception during response processing.
  org.apache.sling.api.resource.PersistenceException: Unable to commit changes to session.
      at org.apache.sling.jcr.resource.internal.helper.jcr.JcrResourceProvider.commit(JcrResourceProvider.java:482)
      at org.apache.sling.resourceresolver.impl.providers.stateful.AuthenticatedResourceProvider.commit(AuthenticatedResourceProvider.java:215)
      at org.apache.sling.resourceresolver.impl.helper.ResourceResolverControl.commit(ResourceResolverControl.java:411)
      at org.apache.sling.resourceresolver.impl.ResourceResolverImpl.commit(ResourceResolverImpl.java:1224)
      at org.apache.sling.servlets.post.AbstractPostOperation.run(AbstractPostOperation.java:129)
      at org.apache.sling.servlets.post.impl.SlingPostServlet.doPost(SlingPostServlet.java:202)
      at org.apache.sling.api.servlets.SlingAllMethodsServlet.mayService(SlingAllMethodsServlet.java:149)
      at org.apache.sling.api.servlets.SlingSafeMethodsServlet.service(SlingSafeMethodsServlet.java:345)
      at org.apache.sling.api.servlets.SlingSafeMethodsServlet.service(SlingSafeMethodsServlet.java:376)
      at org.apache.sling.engine.impl.request.RequestData.service(RequestData.java:546)
      at org.apache.sling.engine.impl.filter.SlingComponentFilterChain.render(SlingComponentFilterChain.java:44)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:77)
      at com.day.cq.personalization.impl.TargetComponentFilter.doFilter(TargetComponentFilter.java:96)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.day.cq.wcm.core.impl.WCMDebugFilter.doFilterWithErrorHandling(WCMDebugFilter.java:187)
      at com.day.cq.wcm.core.impl.WCMDebugFilter.doFilter(WCMDebugFilter.java:154)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.day.cq.wcm.core.impl.WCMComponentFilter.filterRootInclude(WCMComponentFilter.java:362)
      at com.day.cq.wcm.core.impl.WCMComponentFilter.doFilter(WCMComponentFilter.java:177)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at org.apache.sling.engine.impl.SlingRequestProcessorImpl.processComponent(SlingRequestProcessorImpl.java:282)
      at org.apache.sling.engine.impl.filter.RequestSlingFilterChain.render(RequestSlingFilterChain.java:49)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:77)
      at com.adobe.cq.social.ugcbase.security.impl.SaferSlingPostServlet.doFilter(SaferSlingPostServlet.java:126)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.day.cq.dam.core.impl.assetlinkshare.AdhocAssetShareAuthHandler.doFilter(AdhocAssetShareAuthHandler.java:381)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.day.cq.dam.core.impl.servlet.ActivityRecordHandler.doFilter(ActivityRecordHandler.java:155)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:73)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:73)
      at com.adobe.granite.requests.logging.impl.RequestLoggerImpl.doFilter(RequestLoggerImpl.java:127)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.adobe.granite.csrf.impl.CSRFFilter.doFilter(CSRFFilter.java:220)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at org.apache.sling.security.impl.ContentDispositionFilter.doFilter(ContentDispositionFilter.java:181)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.day.cq.wcm.core.impl.AuthoringUIModeServiceImpl.doFilter(AuthoringUIModeServiceImpl.java:367)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.day.cq.wcm.core.impl.warp.TimeWarpFilter.doFilter(TimeWarpFilter.java:106)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.day.cq.wcm.mobile.core.impl.redirect.RedirectFilter.doFilter(RedirectFilter.java:248)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.aem.community.core.filters.LoggingFilter.doFilter(LoggingFilter.java:50)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at org.apache.sling.engine.impl.debug.RequestProgressTrackerLogFilter.doFilter(RequestProgressTrackerLogFilter.java:95)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.day.cq.analytics.provisioning.impl.UserAuthenticationRequestFilter.doFilter(UserAuthenticationRequestFilter.java:119)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.adobe.cq.social.commons.cors.CORSAuthenticationFilter.doFilter(CORSAuthenticationFilter.java:91)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.day.cq.wcm.foundation.forms.impl.FormsHandlingServlet.doFilter(FormsHandlingServlet.java:285)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.adobe.granite.optout.impl.OptOutFilter.doFilter(OptOutFilter.java:74)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.adobe.cq.history.impl.HistoryRequestFilter.doFilter(HistoryRequestFilter.java:107)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.day.cq.wcm.core.impl.WCMRequestFilter.doFilter(WCMRequestFilter.java:90)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.adobe.cq.mcm.campaign.servlets.CampaignCopyTracker.doFilter(CampaignCopyTracker.java:100)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at org.apache.sling.rewriter.impl.RewriterFilter.doFilter(RewriterFilter.java:83)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.adobe.granite.httpcache.impl.InnerCacheFilter.doFilter(InnerCacheFilter.java:77)
      at com.adobe.granite.httpcache.impl.InnerCacheFilter.doFilter(InnerCacheFilter.java:56)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at org.apache.sling.i18n.impl.I18NFilter.doFilter(I18NFilter.java:129)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.adobe.granite.rest.impl.servlet.ApiResourceFilter.doFilter(ApiResourceFilter.java:67)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at org.apache.sling.bgservlets.impl.BackgroundServletStarterFilter.doFilter(BackgroundServletStarterFilter.java:169)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at com.adobe.granite.resourceresolverhelper.impl.ResourceResolverHelperImpl.doFilter(ResourceResolverHelperImpl.java:84)
      at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:68)
      at org.apache.sling.engine.impl.SlingRequestProcessorImpl.doProcessRequest(SlingRequestProcessorImpl.java:151)
      at org.apache.sling.engine.impl.SlingMainServlet.service(SlingMainServlet.java:216)
      at org.apache.felix.http.base.internal.handler.ServletHandler.handle(ServletHandler.java:85)
      at org.apache.felix.http.base.internal.dispatch.InvocationChain.doFilter(InvocationChain.java:79)
      at com.adobe.granite.license.impl.LicenseCheckFilter.doFilter(LicenseCheckFilter.java:308)
      at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:135)
      at org.apache.felix.http.base.internal.dispatch.InvocationChain.doFilter(InvocationChain.java:74)
      at org.apache.felix.http.sslfilter.internal.SslFilter.doFilter(SslFilter.java:89)
      at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:135)
      at org.apache.felix.http.base.internal.dispatch.InvocationChain.doFilter(InvocationChain.java:74)
      at org.apache.sling.security.impl.ReferrerFilter.doFilter(ReferrerFilter.java:290)
      at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:135)
      at org.apache.felix.http.base.internal.dispatch.InvocationChain.doFilter(InvocationChain.java:74)
      at org.apache.sling.i18n.impl.I18NFilter.doFilter(I18NFilter.java:129)
      at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:135)
      at org.apache.felix.http.base.internal.dispatch.InvocationChain.doFilter(InvocationChain.java:74)
      at org.apache.sling.featureflags.impl.FeatureManager.doFilter(FeatureManager.java:116)
      at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:135)
      at org.apache.felix.http.base.internal.dispatch.InvocationChain.doFilter(InvocationChain.java:74)
      at org.apache.sling.engine.impl.log.RequestLoggerFilter.doFilter(RequestLoggerFilter.java:75)
      at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:135)
      at org.apache.felix.http.base.internal.dispatch.InvocationChain.doFilter(InvocationChain.java:74)
      at org.apache.felix.http.base.internal.dispatch.Dispatcher.dispatch(Dispatcher.java:124)
      at org.apache.felix.http.base.internal.DispatcherServlet.service(DispatcherServlet.java:61)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
      at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
      at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
      at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
      at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
      at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
      at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
      at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
      at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
      at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
      at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
      at org.eclipse.jetty.server.Server.handle(Server.java:499)
      at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
      at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
      at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
      at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
      at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
      at java.lang.Thread.run(Unknown Source)
  Caused by: javax.jcr.nodetype.ConstraintViolationException: OakConstraint0030: Uniqueness constraint violated at path [/] for one of the property in [jcr:uuid] having value 6483de35-5fc6-437e-a40d-c9a074ee96ad
      at org.apache.jackrabbit.oak.api.CommitFailedException.asRepositoryException(CommitFailedException.java:225)
      at org.apache.jackrabbit.oak.api.CommitFailedException.asRepositoryException(CommitFailedException.java:212)
      at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.newRepositoryException(SessionDelegate.java:670)
      at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.save(SessionDelegate.java:496)
      at org.apache.jackrabbit.oak.jcr.session.SessionImpl$8.performVoid(SessionImpl.java:419)
      at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.performVoid(SessionDelegate.java:274)
      at org.apache.jackrabbit.oak.jcr.session.SessionImpl.save(SessionImpl.java:416)
      at sun.reflect.GeneratedMethodAccessor45.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      at java.lang.reflect.Method.invoke(Unknown Source)
      at org.apache.sling.jcr.base.SessionProxyHandler$SessionProxyInvocationHandler.invoke(SessionProxyHandler.java:116)
      at com.sun.proxy.$Proxy7.save(Unknown Source)
      at org.apache.sling.jcr.resource.internal.helper.jcr.JcrResourceProvider.commit(JcrResourceProvider.java:480)
      ... 115 common frames omitted
  Caused by: org.apache.jackrabbit.oak.api.CommitFailedException: OakConstraint0030: Uniqueness constraint violated at path [/] for one of the property in [jcr:uuid] having value 6483de35-5fc6-437e-a40d-c9a074ee96ad
      at org.apache.jackrabbit.oak.plugins.index.property.PropertyIndexEditor.checkUniquenessConstraints(PropertyIndexEditor.java:320)
      at org.apache.jackrabbit.oak.plugins.index.property.PropertyIndexEditor.updateIndex(PropertyIndexEditor.java:300)
      at org.apache.jackrabbit.oak.plugins.index.property.PropertyIndexEditor.leave(PropertyIndexEditor.java:243)
      at org.apache.jackrabbit.oak.plugins.index.IndexUpdate.leave(IndexUpdate.java:252)
      at org.apache.jackrabbit.oak.spi.commit.VisibleEditor.leave(VisibleEditor.java:63)
      at org.apache.jackrabbit.oak.spi.commit.CompositeEditor.leave(CompositeEditor.java:74)
      at org.apache.jackrabbit.oak.spi.commit.EditorDiff.process(EditorDiff.java:56)
      at org.apache.jackrabbit.oak.spi.commit.EditorHook.processCommit(EditorHook.java:54)
      at org.apache.jackrabbit.oak.spi.commit.CompositeHook.processCommit(CompositeHook.java:61)
      at org.apache.jackrabbit.oak.spi.commit.CompositeHook.processCommit(CompositeHook.java:61)
      at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore$Commit.prepare(SegmentNodeStore.java:488)
      at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore$Commit.optimisticMerge(SegmentNodeStore.java:519)
      at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore$Commit.execute(SegmentNodeStore.java:575)
      at org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore.merge(SegmentNodeStore.java:238)
      at org.apache.jackrabbit.oak.spi.state.ProxyNodeStore.merge(ProxyNodeStore.java:43)
      at org.apache.jackrabbit.oak.core.MutableRoot.commit(MutableRoot.java:247)
      at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.commit(SessionDelegate.java:347)
      at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.save(SessionDelegate.java:494)
      ... 124 common frames omitted
  </code></pre>