Null Pointer Error using Mache

Uncaught exception from servlet
java.lang.NullPointerException
	at com.fasterxml.jackson.core.json.UTF8JsonGenerator._writeFieldName(UTF8JsonGenerator.java:289)
	at com.fasterxml.jackson.core.json.UTF8JsonGenerator.writeFieldName(UTF8JsonGenerator.java:179)
	at com.google.api.client.json.jackson2.JacksonGenerator.writeFieldName(JacksonGenerator.java:73)
	at com.google.api.client.json.JsonGenerator.serialize(JsonGenerator.java:171)
	at com.google.api.client.json.JsonGenerator.serialize(JsonGenerator.java:172)
	at com.google.api.client.json.JsonGenerator.serialize(JsonGenerator.java:145)
	at com.google.api.client.json.JsonGenerator.serialize(JsonGenerator.java:172)
	at com.google.api.client.json.JsonGenerator.serialize(JsonGenerator.java:106)
	at com.google.api.client.http.json.JsonHttpContent.writeTo(JsonHttpContent.java:78)
	at com.google.api.client.http.GZipEncoding.encode(GZipEncoding.java:49)
	at com.google.api.client.http.HttpEncodingStreamingContent.writeTo(HttpEncodingStreamingContent.java:51)
	at com.google.api.client.util.IOUtils.computeLength(IOUtils.java:113)
	at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:917)
	at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:410)
	at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343)
	at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:460)
	at com.streak.logging.utils.BigqueryIngester.streamingRowIngestion(BigqueryIngester.java:54)
	at com.streak.logging.analysis.LogExportDirectToBigqueryTask.doGet(LogExportDirectToBigqueryTask.java:178)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
	at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
	at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
	at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
	at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
	at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:266)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:326)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
	at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
	at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146)
	at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:446)
	at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:435)
	at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:442)
	at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:186)
	at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:306)
	at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:298)
	at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:439)
	at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
	at java.lang.Thread.run(Thread.java:724)