Protocol Buffers MIME problem - http

Question

Help!
Trying to implement Protocol Buffers via Rest (Jersey), but get this exception.
class com.util.ProtobufMessageBodyReader
class com.util.ProtobufMessageBodyWriter
Jul 6, 2010 3:43:37 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-9102
Jul 6, 2010 3:43:37 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 45485 ms
Jul 6, 2010 3:49:00 PM org.apache.catalina.connector.CoyoteAdapter convertURI
SEVERE: Invalid URI encoding; using HTTP default
Jul 6, 2010 3:49:00 PM com.sun.jersey.spi.container.ContainerRequest getEntity
SEVERE: A message body reader for Java type, class com.example.tutorial.ProfileRequestProto$ProfileRequest, and MIME media type, application/x-protobuf, was not found
I loaded ProtobufMessageBodyReader/Writer in the Apache ContextLoader.
From the log above, it seems Tomcat found the class but it apparent it fails when it reads
#Consumes("application/x-protobuf")
Here is ProtobufMessageBodyReader
#Provider
#Component
#Consumes("application/x-protobuf")
public class ProtobufMessageBodyReader implements MessageBodyReader<Message> {
public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return Message.class.isAssignableFrom(type);
}
public Message readFrom(Class<Message> type, Type genericType, Annotation[] annotations,
MediaType mediaType, MultivaluedMap<String, String> httpHeaders,
InputStream entityStream) throws IOException, WebApplicationException {
try {
Method newBuilder = type.getMethod("newBuilder");
GeneratedMessage.Builder<?> builder = (GeneratedMessage.Builder<?>) newBuilder.invoke(type);
return builder.mergeFrom(entityStream).build();
} catch (Exception e) {
throw new WebApplicationException(e);
}
}
#Override
public boolean isReadable(Class<?> arg0, Type arg1, Annotation[] arg2) {
// TODO Auto-generated method stub
return false;
}
And here is ProtobufMessageBodyWriter
#Provider
#Component
#Produces("application/x-protobuf")
public class ProtobufMessageBodyWriter implements MessageBodyWriter<Message> {
public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return Message.class.isAssignableFrom(type);
}
public long getSize(Message m, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return m.getSerializedSize();
}
public void writeTo(Message m, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String,Object> httpHeaders,OutputStream entityStream) throws IOException, WebApplicationException {
entityStream.write(m.toByteArray());
}
Here is the code from client :
URL url = new URL(URL);
HttpURLConnection http = (HttpURLConnection)url.openConnection();
http.setDoInput(true);
http.setDoOutput(true);
http.setUseCaches(false);
http.setRequestMethod("POST");
http.setRequestProperty("Content-Type","application/x-protobuf");
http.setRequestProperty("Accept", "application/x-protobuf");
DataOutputStream stream = new DataOutputStream(http.getOutputStream ());
if(contentType.equals("application/x-protobuf")) {
ProfileRequest.Builder profile = ProfileRequest.newBuilder();
profile.setName("John");
profile.setId("123");
profile.build().writeTo(http.getOutputStream());
}
stream.flush();
stream.close();
And here is the code from server
#POST
#Consumes("application/x-protobuf")
public byte[] processProtoRequest(ProfileRequest protoRequest) {
byte[] result = null;
ProfileRequest.Builder profile = ProfileRequest.newBuilder();
profile.mergeFrom(protoRequest);
result = getProfileProtoResponse(profile);
}catch(Exception e){
}
return result;
}
I cannot figure out what is the problem.
Is there anything with Jersey config? Or something is wrong when I sent protocol request via HTTP?
Any help will be appreciate it.
Thanks

Answer 1

You mostly nailed the issue yourself already I think:
and MIME media type, application/x-protobuf, was not found
[...]
From the log above, it seems Tomcat found the class but it apparent it fails when it reads
#Consumes("application/x-protobuf")
The media types supported by Jersey (or rather JSR-311/JAX-RS) out of the box are defined in class MediaType. To resolve your issue it might be enough to define an appropriate media type for application/x-protobuf, see thread [Jersey] MediaType-s? for a discussion and samples regarding this.

Answer 2

I just met the same problem on my maven+jersey+protobuf project,and I am using tomcat 6. to me the problems is that the Provider Class the tomcat hasn't found.
After I　solve this problem the tomcat 6.0 shows like this :
Deploying configuration descriptor jerseydemo2.xml
一月 26, 2015 11:13:41 上午 com.sun.jersey.api.core.WebAppResourceConfig init
信息: Scanning for root resource and provider classes in the Web app resource paths:
/WEB-INF/lib
/WEB-INF/classes
一月 26, 2015 11:13:41 上午 com.sun.jersey.api.core.ScanningResourceConfig logClasses
信息: Root resource classes found:
class sample.hello.resources.AddressBookResource
一月 26, 2015 11:13:41 上午 com.sun.jersey.api.core.ScanningResourceConfig logClasses
信息: Provider classes found:
class sample.pb.ProtobufMessageBodyReader
class sample.pb.ProtobufMessageBodyWriter
一月 26, 2015 11:13:41 上午 com.sun.jersey.server.impl.application.WebApplicationImpl initiate
信息: Initiating Jersey application, version 'Jersey: 1.2-SNAPSHOT 01/27/2010 01:47 AM'
before it showed the Provider classes not found.
my problems is that the web.xml file has set the specific path for the tomcat to find all the resouces. now I have changed it like this:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<servlet>
<servlet-name>ServletAdaptor</servlet-name>
<servlet-class>com.sun.jersey.server.impl.container.servlet.ServletAdaptor</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>ServletAdaptor</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
hope it helps you !