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NullPointerException when use webhcat

hi everyone:
I followed the wiki https://cwiki.apache.org/confluence/display/Hive/WebHCat+InstallWebHCat to run webhcat server, it's started.
I use curl :curl 'http://localhost:8080/templeton/v1/status'
return is:{"status":"ok", "version":"v1"}
but, when i use this:curl 'http://localhost:8080/templeton/v1/ddl/database?user.name=user'
return is :{"error":null}
I find some Exceptions in log:
org.apache.hive.hcatalog.templeton.CatchallExceptionMapper |java.lang.NullPointerException     at org.apache.hive.hcatalog.templeton.HcatDelegator.makeArgs(HcatDelegator.java:86)     at org.apache.hive.hcatalog.templeton.HcatDelegator.run(HcatDelegator.java:62)....

any idea about what I can do?
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