What's available in Unmanaged Extensions?

[Nicholas Stuart]

I'm following the guide  http://docs.neo4j.org/chunked/milestone/server-unmanaged-extensions.html to create my own unmanaged extension, but I noticed that is says I can get a Logger, but I tried to get it through the Context and was unable to. What's available from the @Context?

[Michael Hunger]

you can use a java.util.logging logger there.

If that's ok with you?

Michael

[Nicholas Stuart]

I attempted to do this, using @Context Logger logger in my constructor but got an error when I tried to deploy to 1.8 M06.

[Michael Hunger]

Just the usual 

Logger logger = Logger.getLogger(MyClasss.class.getName());

[Nicholas Stuart]

Thanks Michael. What else is available though? I'm trying to return a a Collection Class through a JSON ResponseBuilder Object and am getting an exception when I try to. Do you have any suggestions on how to perform this function?

javax.ws.rs.WebApplicationException: com.sun.jersey.api.MessageException: A message body writer for Java class java.util.HashSet, and Java type class java.util.HashSet, and MIME media type application/json was not found

at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:285)

at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1437)

at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)

at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)

at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)

at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)

at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)

at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)

at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)

at org.neo4j.server.statistic.StatisticFilter.doFilter(StatisticFilter.java:62)

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.servlet.SessionHandler.handle(SessionHandler.java:182)

at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)

at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)

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:926)

at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)

at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)

at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)

at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)

at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

Caused by: com.sun.jersey.api.MessageException: A message body writer for Java class java.util.HashSet, and Java type class java.util.HashSet, and MIME media type application/json was not found

... 25 more

[Lasse Westh-Nielsen]

Nicholas,

I can't remember if Jersey/ JSON work with Sets, but I do remember Maps and Lists wirk nicely - try converting your time to one of those perhaps?

Lasse

[Nicholas Stuart]

It should just marshal it into a Collection, which it should be able to handle, but I changed it to a List/ArrayList and it was still the same error.

[Nicholas Stuart]

So I got it working in a way. If I take my set and return it as a String, but with a @Produces of JSON, it returns it as a JSON list.