Zeppelin UI returns 503 error everytime

[#1]

I am using Zeppelin 0.8 on hdp 3.0.In ambari Zeppelin is shown as started but when I try to access Zeppelin UI it shows

HTTP ERROR 503

Problem accessing /. Reason:

    Service Unavailable

---

Powered by Jetty:// 9.4.11.v20180605

Have checked the permissions on Webapps folder it is fine, even cleared the contents of notebook folder and tried again but with no success.
Even deleted the service and reinstalled it on another host but no effect

Please help @Shelton 

Contents of log :

MultiException stack 1 of 1
com.google.gson.JsonSyntaxException: duplicate key: colWidth
at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191)
at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172)
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172)
at com.google.gson.Gson.fromJson(Gson.java:791)
at com.google.gson.Gson.fromJson(Gson.java:757)
at com.google.gson.Gson.fromJson(Gson.java:706)
at com.google.gson.Gson.fromJson(Gson.java:678)
at org.apache.zeppelin.notebook.Note.fromJson(Note.java:988)
at org.apache.zeppelin.notebook.repo.FileSystemNotebookRepo.get(FileSystemNotebookRepo.java:68)
at org.apache.zeppelin.notebook.repo.NotebookRepoSync.get(NotebookRepoSync.java:165)
at org.apache.zeppelin.notebook.Notebook.loadNoteFromRepo(Notebook.java:505)
at org.apache.zeppelin.notebook.Notebook.loadAllNotes(Notebook.java:589)
at org.apache.zeppelin.notebook.Notebook.<init>(Notebook.java:123)
at org.apache.zeppelin.server.ZeppelinServer.<init>(ZeppelinServer.java:161)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.glassfish.hk2.utilities.reflection.ReflectionHelper.makeMe(ReflectionHelper.java:1375)
at org.jvnet.hk2.internal.Utilities.justCreate(Utilities.java:1083)
at org.jvnet.hk2.internal.ServiceLocatorImpl.create(ServiceLocatorImpl.java:978)
at org.jvnet.hk2.internal.ServiceLocatorImpl.createAndInitialize(ServiceLocatorImpl.java:1082)
at org.jvnet.hk2.internal.ServiceLocatorImpl.createAndInitialize(ServiceLocatorImpl.java:1074)
at org.glassfish.jersey.inject.hk2.AbstractHk2InjectionManager.createAndInitialize(AbstractHk2InjectionManager.java:213)
at org.glassfish.jersey.inject.hk2.ImmediateHk2InjectionManager.createAndInitialize(ImmediateHk2InjectionManager.java:54)
at org.glassfish.jersey.server.ApplicationConfigurator.createApplication(ApplicationConfigurator.java:138)
at org.glassfish.jersey.server.ApplicationConfigurator.init(ApplicationConfigurator.java:96)
at org.glassfish.jersey.server.ApplicationHandler.lambda$initialize$0(ApplicationHandler.java:313)
at java.util.Arrays$ArrayList.forEach(Arrays.java:3880)
at org.glassfish.jersey.server.ApplicationHandler.initialize(ApplicationHandler.java:313)
at org.glassfish.jersey.server.ApplicationHandler.<init>(ApplicationHandler.java:282)
at org.glassfish.jersey.servlet.WebComponent.<init>(WebComponent.java:335)
at org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:178)
at org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:370)
at javax.servlet.GenericServlet.init(GenericServlet.java:244)
at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:670)
at org.eclipse.jetty.servlet.ServletHolder.initialize(ServletHolder.java:427)
at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:760)
at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:374)
at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1497)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1459)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:848)
at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:287)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:545)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:138)
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:167)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:138)
at org.eclipse.jetty.server.Server.start(Server.java:419)
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:108)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
at org.eclipse.jetty.server.Server.doStart(Server.java:386)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.apache.zeppelin.server.ZeppelinServer.main(ZeppelinServer.java:215)
WARN [2020-06-04 18:02:26,999] ({main} WebAppContext.java[doStart]:554) - Failed startup of context o.e.j.w.WebAppContext@60611244{zeppelin-web,/,file:///usr/hdp/3.0.1.0-187/zeppelin/webapps/webapp/,UNAVAILABLE}{/usr/hdp/current/zeppelin-server/lib/zeppelin-web-0.8.0.3.0.1.0-187.war}
javax.servlet.ServletException: rest@355bd4==org.eclipse.jetty.servlet.NoJspServlet,jsp=rest,order=-1,inst=false
at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:691)
at org.eclipse.jetty.servlet.ServletHolder.initialize(ServletHolder.java:427)
at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:760)
at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:374)
at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1497)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1459)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:848)
at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:287)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:545)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:138)
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:167)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:138)
at org.eclipse.jetty.server.Server.start(Server.java:419)
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:108)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
at org.eclipse.jetty.server.Server.doStart(Server.java:386)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.apache.zeppelin.server.ZeppelinServer.main(ZeppelinServer.java:215)
Caused by: A MultiException has 1 exceptions. They are:
1. com.google.gson.JsonSyntaxException: duplicate key: colWidth

at org.jvnet.hk2.internal.Utilities.justCreate(Utilities.java:1085)
at org.jvnet.hk2.internal.ServiceLocatorImpl.create(ServiceLocatorImpl.java:978)
at org.jvnet.hk2.internal.ServiceLocatorImpl.createAndInitialize(ServiceLocatorImpl.java:1082)
at org.jvnet.hk2.internal.ServiceLocatorImpl.createAndInitialize(ServiceLocatorImpl.java:1074)
at org.glassfish.jersey.inject.hk2.AbstractHk2InjectionManager.createAndInitialize(AbstractHk2InjectionManager.java:213)
at org.glassfish.jersey.inject.hk2.ImmediateHk2InjectionManager.createAndInitialize(ImmediateHk2InjectionManager.java:54)
at org.glassfish.jersey.server.ApplicationConfigurator.createApplication(ApplicationConfigurator.java:138)
at org.glassfish.jersey.server.ApplicationConfigurator.init(ApplicationConfigurator.java:96)
at org.glassfish.jersey.server.ApplicationHandler.lambda$initialize$0(ApplicationHandler.java:313)
at java.util.Arrays$ArrayList.forEach(Arrays.java:3880)
at org.glassfish.jersey.server.ApplicationHandler.initialize(ApplicationHandler.java:313)
at org.glassfish.jersey.server.ApplicationHandler.<init>(ApplicationHandler.java:282)
at org.glassfish.jersey.servlet.WebComponent.<init>(WebComponent.java:335)
at org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:178)
at org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:370)
at javax.servlet.GenericServlet.init(GenericServlet.java:244)
at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:670)
... 21 more
Caused by: com.google.gson.JsonSyntaxException: duplicate key: colWidth
at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:191)
at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:146)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172)
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172)
at com.google.gson.Gson.fromJson(Gson.java:791)
at com.google.gson.Gson.fromJson(Gson.java:757)
at com.google.gson.Gson.fromJson(Gson.java:706)
at com.google.gson.Gson.fromJson(Gson.java:678)
at org.apache.zeppelin.notebook.Note.fromJson(Note.java:988)
at org.apache.zeppelin.notebook.repo.FileSystemNotebookRepo.get(FileSystemNotebookRepo.java:68)
at org.apache.zeppelin.notebook.repo.NotebookRepoSync.get(NotebookRepoSync.java:165)
at org.apache.zeppelin.notebook.Notebook.loadNoteFromRepo(Notebook.java:505)
at org.apache.zeppelin.notebook.Notebook.loadAllNotes(Notebook.java:589)
at org.apache.zeppelin.notebook.Notebook.<init>(Notebook.java:123)
at org.apache.zeppelin.server.ZeppelinServer.<init>(ZeppelinServer.java:161)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.glassfish.hk2.utilities.reflection.ReflectionHelper.makeMe(ReflectionHelper.java:1375)
at org.jvnet.hk2.internal.Utilities.justCreate(Utilities.java:1083)
... 37 more
INFO [2020-06-04 18:02:27,022] ({main} AbstractConnector.java[doStart]:289) - Started ServerConnector@5d0e703a{HTTP/1.1,[http/1.1]}{0.0.0.0:9995}
INFO [2020-06-04 18:02:27,023] ({main} Server.java[doStart]:411) - Started @21690ms
INFO [2020-06-04 18:02:27,023] ({main} ZeppelinServer.java[main]:223) - Done, zeppelin server started

[#2]

I had the same issue on HDP after I moved to remote storage for my notebooks (hdfs). Here is what helped me but at cost of all notebooks that I had to delete.

FIrstly, delete webapps dir on the host where you installed zeppelin:

sudo rm -r /usr/hdp/current/zeppelin-server/webapps

and then remote storage (could be a local folder it depends on where you keep them) for notebooks (you can copy them into a backup folder before deleting too)

hdfs dfs -rm -r /user/zeppelin/notebook/*

Make sure you clear your notebooks in hdfs (local) and restart zeppelin.