Internal Server Error: Exception in SWP Servlet when calling service with POST request

[Nicolas Fouqué]

Hello, 

I have a SWP webservice taht is defined the most basically possible, it's a ui:JSONService and it is supposed to use a few parameters defined with spin:constraint : 

Argument directorysynchro:entityDirectoryGraph : rdfs:Resource

Argument directorysynchro:entityDirectoryZipFilePath : xsd:string

However, when I use Postman to send the following POST request : 

http://localhost:8083/tbl/swp?_viewClass=directorysynchro:_test_ImportDirectory_zipFile&directorysynchro:entityDirectoryGraph=urn:x-evn-master:graph_in_edg&directorysynchro:entityDirectoryZipFilePath=/project/filepath

I instantly get this error

org.topbraid.core.servlet.HttpErrorException: Exception in SWP Servlet

at org.topbraidlive.swp.servlet.SWPServlet.run(SWPServlet.java:220)

at org.topbraidlive.swp.servlet.SWPServlet.run(SWPServlet.java:132)

at org.topbraidlive.swp.servlet.SWPServlet.run(SWPServlet.java:114)

at org.topbraidlive.swp.servlet.SWPServlet.doPost(SWPServlet.java:77)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)

... Rest omitted

Caused by: java.lang.NullPointerException

at org.topbraid.spin.swp.servlet.SWPServletUtil.addParametersToScope(SWPServletUtil.java:585)

at org.topbraid.spin.swp.servlet.SWPServletUtil.addParametersToScope(SWPServletUtil.java:543)

at org.topbraid.spin.swp.servlet.SWPServletUtil.getView(SWPServletUtil.java:413)

at org.topbraid.spin.swp.servlet.SWPServletUtil.runUncached(SWPServletUtil.java:740)

at org.topbraid.spin.swp.servlet.SWPServletUtil.run(SWPServletUtil.java:729)

at org.topbraidlive.swp.servlet.SWPServlet.run(SWPServlet.java:180)

... 45 more

What's strange is that when I try to send the same request as a GET, the service does start (I get logs and ui:dumpScope), however the parameters are not properly bound (I check them with ui:dumpscope but they are all empty)

[Holger Knublauch]

Hi Nicolas,

please try the argument names without the prefix, e.g.

http://localhost:8083/tbl/swp?_viewClass=directorysynchro:_test_ImportDirectory_zipFile&entityDirectoryGraph=urn:x-evn-master:graph_in_edg&entityDirectoryZipFilePath=/project/filepath

The interpretation of spl:Arguments in SWP (and SPIN) is that only the local name part of the predicate will be used. So for ex:predicate you would use the parameter predicate without the ex:

HTH
Holger

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[Nicolas Fouqué]

Hi Holger, 

Thank you for your help, I can now use GET requests with parameters, but I still get the same error when I try to use POST requests

Any idea why that might be ?

Thanks in advance,

Nicolas

[Holger Knublauch]

With POST requests, the SWP servlet expects the parameters to be part of the request body.

Holger

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