Hi,
I found log the file and the error message is:
Oct 29, 2011 4:22:03 PM com.sun.jersey.spi.container.ContainerResponse 
writeSEVERE: A message body writer for Java class 
hk.itags.server.unmanaged.Todo, and Java type class 
hk.itags.server.unmanaged.Todo, and MIME media type application/json was not 
foundOct 29, 2011 4:22:03 PM com.sun.jersey.spi.container.ContainerResponse 
writeSEVERE: The registered message body writers compatible with the MIME media 
type are:*/* ->  com.sun.jersey.core.impl.provider.entity.FormProvider  
com.sun.jersey.core.impl.provider.entity.StringProvider  
com.sun.jersey.core.impl.provider.entity.ByteArrayProvider  
com.sun.jersey.core.impl.provider.entity.FileProvider  
com.sun.jersey.core.impl.provider.entity.InputStreamProvider  
com.sun.jersey.core.impl.provider.entity.DataSourceProvider  
com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General  
com.sun.jersey.core.impl.provider.entity.ReaderProvider  
com.sun.jersey.core.impl.provider.entity.DocumentProvider  
com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider  
com.sun.jersey.core.impl.provider.entity.SourceProvider$SourceWriter  
com.sun.jersey.server.impl.template.ViewableMessageBodyWriter  
com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$General  
com.sun.jersey.core.impl.provider.entity.XMLListElementProvider$General
Oct 29, 2011 4:22:03 PM com.sun.jersey.spi.container.ContainerResponse 
traceExceptionSEVERE: Mapped exception to response: 500 (Internal Server 
Error)javax.ws.rs.WebApplicationException       at 
com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:273)
     at 
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1140)
       at 
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1053)
        at 
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1043)
        at 
com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:406)
     at 
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:477)
     at 
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:662)
     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.handle(ServletHandler.java:390)     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$RequestHandler.headerComplete(HttpConnection.java:926)
      at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)  at 
org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)     at 
org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)     at 
org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)  
     at 
org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
----------------------------------------
> From: [email protected]
> To: [email protected]
> Date: Sat, 29 Oct 2011 06:49:51 +0000
> Subject: [Neo4j] Server log file for HA
>
>
> Hi,
> I could not find any log message for unmanaged extension when a 500 error 
> respond generated in HA configuration.Does neo4j rest server generate any 
> message for unmanaged extension?
> I was trying to use JAXB for JSON respond of an object but get the 500 error 
> respond. But I can successfully get a XML respond.Any idea?
> Regards,
> Brendan
> _______________________________________________
> Neo4j mailing list
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