Hi,
I am struggling to get the Restlet GWT to query my rest service
(provided by resteasy, but I can't change this implemenation). I made
a minimal example which calls the rest service (stripped some GWT
code), which unfortunately does not work.
public class My_frontend_gwt implements EntryPoint {
public void onModuleLoad() {
final Button myButton = new Button("My");
myButton.addClickListener(new ClickListener() {
public void onClick(Widget sender) {
final Client client = new Client(Protocol.HTTP);
client.get("http://localhost:8088/com.myapp/rest/books/books.xml
",
new Uniform() {
public void handle(Request
request, Response response, Uniform callback) {
try {
nameField.setText(response.getEntity().getText());
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
});
}
When I invoke the rest service with a curl call, I get (curl
http://localhost:8088/com.myapp/rest/books/books.xml)
:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?
><collection><book><id_>1</id_><title>test1</title></
book><book><id_>2</id_><title>test2</title></book></collection>
I am sure the service is also called from the GWT applications, since
I see a hibernate query log passing:
Hibernate: select book0_.id_ as id1_84_, ... from Book book0_
But the entitiy in the Response object in the handle method equals
null, which causes the getText() method to fail (I also tried
getEntityAsXml() instead of getEntity()). So, the results are not fed
back into the response, in my opinion.
I am running this test with org.restlet.jar from restlet-gwt-2.0m4,
which is the only lib in my classpath. The imports I am using are
import org.restlet.Client;
import org.restlet.Uniform;
import org.restlet.data.Protocol;
import org.restlet.data.Request;
import org.restlet.data.Response;
When using org.restlet.gwt-2.0-M3.jar from the maven repository and
the following snippet, the entity in my Response is still null, and
the GWT hosted mode provides me with the error shown below.
import org.restlet.gwt.Callback;
import org.restlet.gwt.Client;
import org.restlet.gwt.data.Protocol;
import org.restlet.gwt.data.Request;
import org.restlet.gwt.data.Response;
public class My_frontend_gwt implements EntryPoint {
public void onModuleLoad() {
final Button myButton = new Button("My");
myButton.addClickListener(new ClickListener() {
public void onClick(Widget sender) {
final Client client = new Client(Protocol.HTTP);
client.get("http://localhost:8088/com.myapp/rest/books/books.xml
",
new Callback() {
public void onEvent(Request
request, Response response) {
nameField.setText(response.getEntityAsXml().getText());
}
});
}
});
}
Error with stacktrace:
[ERROR] Uncaught exception escaped
java.lang.NullPointerException: null
at com.myapp.gwt. My_frontend_gwt $1$1.onEvent(My_frontend_gwt.java:75)
at org.restlet.gwt.engine.http.HttpClientConverter
$1.onEvent(HttpClientConverter.java:383)
at org.restlet.gwt.engine.http.GwtHttpClientCall
$2.onResponseReceived(GwtHttpClientCall.java:234)
at
com
.google
.gwt.http.client.Request.fireOnResponseReceivedImpl(Request.java:264)
at
com
.google
.gwt.http.client.Request.fireOnResponseReceivedAndCatch(Request.java:
236)
at
com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:
227)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun
.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
39)
at
sun
.reflect
.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:
103)
at
com.google.gwt.dev.shell.mac.MethodDispatch.invoke(MethodDispatch.java:
71)
at org.eclipse.swt.internal.carbon.OS.ReceiveNextEvent(Native Method)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2909)
at
com
.google.gwt.dev.SwtHostedModeBase.processEvents(SwtHostedModeBase.java:
235)
at
com.google.gwt.dev.HostedModeBase.pumpEventLoop(HostedModeBase.java:558)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:405)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
So, as a starter, I would like to get to the plain xml result in my
response (which is now giving me the NullPointerException). But it
would be even better if I can get an automatic translation between the
xml result and a set of java pojo's that I will make available for
GWT, analogous to what Resteasy does to go from my jpa model to the
xml representation (with XmlAdapters for the classes that have no
default serialization in jaxb).
A long post, but I could not bring the message without this
elaboration. Let me know if I need certain aspects need more
clarification.
Thanks,
Johannes
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