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Falcon Web UI is inaccessible(HTTP 503 error) and Ambari Service Check for Falcon fails: "ERROR: Unable to initialize Falcon Client object"

October 5, 2026 at 9:13 AM
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ISSUE : In Ambari 2.4.x, Falcon Web UI is inaccessible(HTTP 503 error) and Ambari Service Check for Falcon fails: "ERROR: Unable to initialize Falcon Client object"

Snippet of error from falcon logs

2017-01-04 14:08:56,390 INFO - [main:] ~ Initializing graph db (MetadataMappingService:143) 2017-01-04 14:08:56,438 ERROR - [main:] ~ Failed startup of context org.mortbay.jetty.webapp.WebAppContext@96a75da{/,/usr/hdp/current/falcon-server/server/webapp/falcon} (log:87) Caused by: org.apache.falcon.FalconException: java.lang.RuntimeException: GraphFactory could not instantiate this Graph implementation [com.thinkaurelius.titan.core.TitanFactory]. Caused by: java.lang.RuntimeException: GraphFactory could not instantiate this Graph implementation [com.thinkaurelius.titan.core.TitanFactory]. Caused by: java.lang.reflect.InvocationTargetException Caused by: java.lang.NoClassDefFoundError: com/sleepycat/je/LockMode Caused by: java.lang.ClassNotFoundException: com.sleepycat.je.LockMode 2017-01-04 14:08:56,440 INFO - [main:] ~ Started SocketConnector@0.0.0.0:15000 (log:67)

ROOT CAUSE : Missing jar

WORK AROUND :

On the falcon server, download missing jar and save it under falcon lib location

wget http://search.maven.org/remotecontent?filepath=com/sleepycat/je/5.0.73/je-5.0.73.jar -O /usr/hdp/current/falcon-server/server/webapp/falcon/WEB-INF/lib/je-5.0.73.jar chown falcon:hadoop /usr/hdp/current/falcon-server/server/webapp/falcon/WEB-INF/lib/je-5.0.73.jar

Restart Falcon server from Ambari. Hortonworks cannot ship this jar. It has to be manually downloaded.

mandeep_singh

Silver ⭐️⭐️

Thanks I had same issue with HDP 2.6 upgrade. I was able to fix it after following the instructions.

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subrata_bandyop

Gold ⭐️

thanks for the resolution. this resolved the falcon issue after upgrading to HDP-2.6.0.3 .

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jianle

Silver ⭐️

I just ran into the same issue in HDP 2.6.0 whose Ambari.repo content is:

#VERSION_NUMBER=2.5.0.3-7 [ambari-2.5.0.3] name=ambari Version - ambari-2.5.0.3 baseurl=http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.5.0.3 gpgcheck=1 gpgkey=http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.5.0.3/RPM-GPG-KEY/RPM-GPG-KEY-Jenkins enabled=1 priority=1

The work-around posted here fixed my issue.

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