Created question in FIWARE Q/A platform on 01-07-2016 at 12:07
Please, ANSWER this question AT https://stackoverflow.com/questions/38142597/orion-proton-subscription-java-lang-nullpointerexception-parsing-an-event-fro

Question:
Orion / Proton subscription: java.lang.NullPointerException parsing an event from Orion

Description:
My Proton instance fails with a java.lang.NullPointerException whenever an event is sent by Orion

this is the Proton log:

proton_1 | 01-Jul-2016 09:46:03.117 INFO [http-nio-8080-exec-1] com.ibm.hrl.proton.webapp.providers.EventXmlNgsiMessageReader.readFrom started event message body reader
proton_1 | 01-Jul-2016 09:46:03.125 INFO [http-nio-8080-exec-1] com.ibm.hrl.proton.webapp.providers.EventXmlNgsiMessageReader.readFrom Event: ApeContextUpdate
proton_1 | 01-Jul-2016 09:46:03.126 SEVERE [http-nio-8080-exec-1] com.ibm.hrl.proton.webapp.providers.EventXmlNgsiMessageReader.readFrom Could not parse XML NGSI event java.lang.NullPointerException, reason: null
proton_1 | last attribute name: null last value: null
proton_1 | 01-Jul-2016 09:46:03.130 INFO [http-nio-8080-exec-1] com.ibm.hrl.proton.webapp.providers.EventXmlNgsiMessageReader.readFrom finished event message body reader
proton_1 | 01-Jul-2016 09:46:03.131 INFO [http-nio-8080-exec-1] com.ibm.hrl.proton.webapp.resources.EventResource.submitNewEvent starting submitNewEvent
proton_1 | 01-Jul-2016 09:46:03.132 SEVERE [http-nio-8080-exec-1] com.ibm.hrl.proton.webapp.resources.EventResource.submitNewEvent Could not send event, reason: java.lang.NullPointerException, message: null

I've read the Appendix of the User guide and double checked the event name and the attributes list.

This is an xml sent by orion:

POST /ProtonOnWebServer/rest/events HTTP/1.1
User-Agent: orion/0.28.0 libcurl/7.19.7
Host: localhost:8080
Accept: application/xml, application/json
Content-length: 772
Content-type: application/xml

<notifyContextRequest>
<subscriptionId>57762eb9982959644644f9ee</subscriptionId>
<originator>localhost</originator>
<contextResponseList>
<contextElementResponse>
<contextElement>
<entityId type="Ape" isPattern="false">
<id>u1</id>
</entityId>
<contextAttributeList>
<contextAttribute>
<name>carsharing</name>
<type>urn:x-ogc:def:trs:IDAS:1.0:ISO8601</type>
<contextValue>2016-07-01T11:01:06</contextValue>
</contextAttribute>
</contextAttributeList>
</contextElement>
<statusCode>
<code>200</code>
<reasonPhrase>OK</reasonPhrase>
</statusCode>
</contextElementResponse>
</contextResponseList>
</notifyContextRequest>

This is the definition of the Proton project (BTW this is the project copied from
the server filesystem because also the rest api fails with a
NullPointerException)

{
"epn": {
"events": [
{
"name": "ApeContextUpdate",
"createdDate": "Fri Jul 01 2016",
"attributes": [

,

,

]
}
],
"epas": [],
"contexts":

,
"consumers": [],
"producers": [],
"name": "t0"
}
}

and this is my docker-compose file:

mongo:
image: mongo:2.6
command: --smallfiles --quiet

proton:
image: fiware/proactivetechnologyonline
ports:

• "8080:8080"

orion:
image: fiware/orion:0.28
links:

• mongo
• proton
  command: -dbhost mongo --silent
  ports:
• "1026:1026"

I'm using Orion 0.28 (the last one that supports XML notifications) and the latest Proton

UPDATE 1 - catalina.log

07-Jul-2016 07:52:39.914 INFO [http-nio-8080-exec-1] com.ibm.hrl.proton.webapp.providers.EventXmlNgsiMessageReader.readFrom started event message body reader
07-Jul-2016 07:52:39.924 INFO [http-nio-8080-exec-1] com.ibm.hrl.proton.webapp.providers.EventXmlNgsiMessageReader.readFrom Event: ApeContextUpdate
07-Jul-2016 07:52:39.924 SEVERE [http-nio-8080-exec-1] com.ibm.hrl.proton.webapp.providers.EventXmlNgsiMessageReader.readFrom Could not parse XML NGSI event java.lang.NullPointerException, reason: null
last attribute name: null last value: null
07-Jul-2016 07:52:39.928 INFO [http-nio-8080-exec-1] com.ibm.hrl.proton.webapp.providers.EventXmlNgsiMessageReader.readFrom finished event message body reader
07-Jul-2016 07:52:39.929 INFO [http-nio-8080-exec-1] com.ibm.hrl.proton.webapp.resources.EventResource.submitNewEvent starting submitNewEvent
07-Jul-2016 07:52:39.929 SEVERE [http-nio-8080-exec-1] com.ibm.hrl.proton.webapp.resources.EventResource.submitNewEvent Could not send event, reason: java.lang.NullPointerException, message: null