JAX-RS JAXB JSON Response not working ( MessageBodyProviderNotFoundException) - json

Question

I had been working for sometime to figure out how to create a JAX Restful Service... using the guide available here - Jersey
As explained in Section 2.3.2, I had added the below dependency in Maven -
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet</artifactId>
<version>2.0</version>
</dependency>
In web.xml
<servlet>
<servlet-name>Jersey REST Service</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.classnames</param-name>
<param-value>org.glassfish.jersey.filter.LoggingFilter</param-value>
</init-param>
<init-param>
<param-name>javax.ws.rs.Application</param-name>
<param-value>com.hms.rs.controller.MyApp</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey REST Service</servlet-name>
<url-pattern>/services/*</url-pattern>
</servlet-mapping>
and MyApp.java
public class MyApp extends Application{
#Override
public Set<Class<?>> getClasses() {
return new HashSet<Class<?>>() {{
// Add your resources.
System.out.println("From the Myapp...");
add(Patient.class);
add(PatientController.class);
// Add LoggingFilter.
add(LoggingFilter.class);
}};
}
}
Patient.java -
#XmlRootElement(name = "Patient")
public class Patient {
private String patientFName;
private String patientLName;
private int patientAge;
private String patientSex;
private String patientParentSpouse;
private String patientQual;
private String patientOccupation;
private String patientComments;
public Patient()
{
}
Setters and Getters....
}
PatientController.java -
#Path("/ManagePatient")
public class PatientController {
#GET
#Path("/getPatient")
#Produces(MediaType.APPLICATION_XML)
public Patient printPatient() {
System.out.println("Hello.... from the PatientController");
Patient ptnt = new Patient();
ptnt.setPatientFName("FirstN");
ptnt.setPatientLName("LName");
ptnt.setPatientAge(30);
ptnt.setPatientSex("M");
ptnt.setPatientParentSpouse("ParentSpuse");
ptnt.setPatientQual("engg");
ptnt.setPatientOccupation("software");
ptnt.setPatientComments("comments here");
System.out.println("Patient = " + ptnt);
//return ptnt.toString();
return ptnt;
}
When I try to access this via browser # localhost:8080/HMS_Web/services/ManagePatient/getPatient
I am getting
javax.servlet.ServletException: org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyWriter not found for media type=text/html, type=class com.hms.app.ui.beans.Patient, genericType=class com.hms.app.ui.beans.Patient.
and I also see the below warning in the logs-
WARNING: A provider com.hms.app.ui.beans.Patient registered in SERVER runtime does not implement any provider interfaces applicable in the SERVER runtime. Due to constraint configuration problems the provider com.hms.app.ui.beans.Patient will be ignored.
If Jersey 2.0 supports JAXB based xml or json support as mentioned # section "8.1.1.2. JAXB based JSON support" in the Jersey guide, I am not sure why I am receiving the Provider errors.
Could any JAX-WS expert help me understand and also provide me direction on how to resolve this situation?
Thank you in advance

Answer 1

you are accessing the service via browser, so your PatientController will try to render response as html, I guess this is the reason for the
javax.servlet.ServletException: org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyWriter not found for media type=text/html, type=class com.hms.app.ui.beans.Patient, genericType=class com.hms.app.ui.beans.Patient.
try to comsume the service via jersey client api as following:
WebTarget webTarget = client.target("http://localhost:8080/HMS_Web/services/ManagePatient/getPatient");
Patient patient = webTarget.request(MediaType.APPLICATION_XML_TYPE).get(Patient.class);
for the warning:
WARNING: A provider com.hms.app.ui.beans.Patient registered in SERVER runtime does not implement any provider interfaces applicable in the SERVER runtime. Due to constraint configuration problems the provider com.hms.app.ui.beans.Patient will be ignored.
I think you should remove:
add(Patient.class);
in your MyApp. Patient is just a POJO, it is neither a resource nor a provider.