Hi all! I'm a newbie with Restlet and I have a problem. I created a service
that works perfectly but my client application does not. It fails when I invoke
the DELETE method. GET, POST and PUT works fine.
This is the code from my client application:
JSONObject object = new JSONObject();
object.put("name", "a name");
Request request = new Request(Method.DELETE, reference);
request.setEntity(new JsonRepresentation(object.toString()));
Client client = new Client(Protocol.HTTP);
Response response = client.handle(request);
String text = response.getEntity().getText();
The code from the ServerResource class:
public class MyResource extends ServerResource {
@Delete
public Representation deleteUser(Representation entity) {
try {
String jsonString = (new
JsonRepresentation(entity)).getJsonObject().toString();
Map map = (Map) (new JSONParser()).parse(jsonString);
if(map.size() > 0) {
String message = dbc.deleteUser(map.get("name").toString());
return new StringRepresentation(message, MediaType.TEXT_PLAIN);
} else {
return new StringRepresentation("Unable to delete user",
MediaType.TEXT_PLAIN);
}
} catch (Exception ex) {
return new StringRepresentation("ERROR: " + ex.getMessage(),
MediaType.TEXT_PLAIN);
}
}
... }
POST and PUT methods start with the same code. I tested each method using
Advanced Rest Client in Chrome and all of them works perfectly. It only fails
in my client application. This is the exception:
java.lang.NullPointerException
at java.io.StringReader.<init>(Unknown Source)
at org.json.JSONTokener.<init>(JSONTokener.java:66)
at org.json.JSONObject.<init>(JSONObject.java:402)
at
org.restlet.ext.json.JsonRepresentation.getJsonObject(JsonRepresentation.java:199)
at service.MyResource.borrarUsuario(MyResource.java:95)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.restlet.resource.ServerResource.doHandle(ServerResource.java:503)
at
org.restlet.resource.ServerResource.delete(ServerResource.java:208)
at
org.restlet.resource.ServerResource.doHandle(ServerResource.java:594)
at
org.restlet.resource.ServerResource.doNegotiatedHandle(ServerResource.java:649)
at
org.restlet.resource.ServerResource.doConditionalHandle(ServerResource.java:348)
at
org.restlet.resource.ServerResource.handle(ServerResource.java:952)
at org.restlet.resource.Finder.handle(Finder.java:246)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.routing.Router.doHandle(Router.java:431)
at org.restlet.routing.Router.handle(Router.java:648)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at
org.restlet.engine.application.StatusFilter.doHandle(StatusFilter.java:155)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at
org.restlet.engine.CompositeHelper.handle(CompositeHelper.java:211)
at
org.restlet.engine.application.ApplicationHelper.handle(ApplicationHelper.java:84)
at org.restlet.Application.handle(Application.java:381)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.routing.Router.doHandle(Router.java:431)
at org.restlet.routing.Router.handle(Router.java:648)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.routing.Router.doHandle(Router.java:431)
at org.restlet.routing.Router.handle(Router.java:648)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at
org.restlet.engine.CompositeHelper.handle(CompositeHelper.java:211)
at org.restlet.Component.handle(Component.java:392)
at org.restlet.Server.handle(Server.java:516)
at org.restlet.engine.ServerHelper.handle(ServerHelper.java:72)
at
org.restlet.engine.adapter.HttpServerHelper.handle(HttpServerHelper.java:152)
at
org.restlet.ext.servlet.ServerServlet.service(ServerServlet.java:1089)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
at java.lang.Thread.run(Unknown Source)
may 22, 2013 3:10:58 PM org.restlet.engine.log.LogFilter afterHandle
INFO: 2013-05-22 15:10:58 127.0.0.1 - 127.0.0.1 8181 DELETE
/Restlet_Service/ - 200 11 17 20592 http://localhost:8181
Restlet-Framework/2.1.2 -
The line 95 is "String jsonString = (new
JsonRepresentation(entity)).getJsonObject().toString();".
I'm stuck and need help with this.
Thanks in advance.
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