sam created ZEPPELIN-1748:
-----------------------------

             Summary: Trying to set dependencies using API results in 500 (NPE)
                 Key: ZEPPELIN-1748
                 URL: https://issues.apache.org/jira/browse/ZEPPELIN-1748
             Project: Zeppelin
          Issue Type: Bug
    Affects Versions: 0.7.0
            Reporter: sam


When I try

{code}
curl -w "%{http_code}" -XPUT 
http://192.168.99.100:8080/api/interpreter/setting/2C54NSZZQ -d 
'{"dependencies":[
  {
    "groupArtifactVersion":"/usr/zeppelin/ml-view-assembly.jar",
    "exclusions":[]
  }
]}'
{code}

I get a 500 back, and in the zeppelin logs I see the following ST.

I've noticed that Zeppelin often gives this kind of error for the API.

{code}
WARN [2016-12-04 09:09:05,120] ({qtp901506536-12 - 
/api/interpreter/setting/2C54NSZZQ} LogUtils.java[doLog]:452) - Application 
{http://rest.zeppelin.apache.org/}HeliumRestApi has thrown exception, unwinding 
now
org.apache.cxf.interceptor.Fault
        at 
org.apache.cxf.service.invoker.AbstractInvoker.createFault(AbstractInvoker.java:162)
        at 
org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:128)
        at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:192)
        at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:100)
        at 
org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:57)
        at 
org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:93)
        at 
org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:272)
        at 
org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
        at 
org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:239)
        at 
org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:248)
        at 
org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:222)
        at 
org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:153)
        at 
org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:167)
        at 
org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:286)
        at 
org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPut(AbstractHTTPServlet.java:223)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
        at 
org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:262)
        at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)
        at 
org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
        at 
org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
        at 
org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
        at 
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
        at 
org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
        at 
org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
        at 
org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
        at 
org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
        at 
org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
        at 
org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
        at 
org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
        at 
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at org.apache.zeppelin.server.CorsFilter.doFilter(CorsFilter.java:72)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
        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(Thread.java:745)
Caused by: java.lang.NullPointerException
        at 
org.apache.zeppelin.rest.InterpreterRestApi.updateSetting(InterpreterRestApi.java:120)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:180)
        at 
org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:96)
        ... 50 more
{code}

As a workaround when I add

{code}
-H 'Content-Type:application/json' 
{code}

To my curl command it works.  This doesn't seem right, it seems like the API 
should return with BadRequest or something and give a helpful message.  
Internal error suggests the code isn't right.



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