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REST service returns HTTP 204 (Tomcat / Linux)

I have a problem running my code on a Linux distribution (Raspbian, Tomcat 7). The problem does not appear in the test environment under Windows / Tomcat 7 / Eclipse:

My web service just returns HTTP 204 and nothing more. The log does not indicate any error during the request. It should, as in the test environment, respond json.

web.xml

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> <display-name>***</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <listener> <listener-class>**.useravailability.UserAvailabilityServletContextListener</listener-class> </listener> <servlet-mapping> <servlet-name>REST Service</servlet-name> <url-pattern>/REST/*</url-pattern> </servlet-mapping> <servlet> <servlet-name>REST Service</servlet-name> <servlet-class>com.sun.jersey.server.impl.container.servlet.ServletAdaptor</servlet-class> <init-param> <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name> <param-value>true</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> </web-app>

usersService.xml

 package **.webservice; import java.util.ArrayList; import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.Produces; import com.google.gson.Gson; import **.model.AccessManager; @Path("/usersService") public class UsersService { @GET @Produces("application/json") public String getUser() { String user = null; ArrayList<String> userList = new ArrayList<String>(); try { userList = new AccessManager().getUser(); Gson gson = new Gson(); user = gson.toJson(userList); } catch (Exception e) { e.printStackTrace(); } return user; } }

What am I missing? And why does it work in a test environment? Thanks!

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2 answers

Thanks everyone! I missed the error message that the jdbc driver was missing. I forgot to add it to the build path before loading.

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Jersey returns HTTP 204 if you return null.

I think this is the best behavior.

In your case, you probably have an exception, so the user is null.

if you want to return an error code (which could be more logical), you can replace

 catch (Exception e) { e.printStackTrace(); }

by

 catch (Exception e) { throw new WebApplicationException(404); }

if you want to indicate that the user cannot be found, or 5XX HTTp if you want to return an error code on the server side.

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