Why does jersey have no error log when the status is 500? - jersey-2.0

Question

This is my 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.packages</param-name>
<param-value>rest</param-value>
</init-param>
<init-param>
<param-name>jersey.config.server.provider.classnames</param-name>
<param-value>org.glassfish.jersey.filter.LoggingFilter</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
And this is my resource class:
#Path("/main")
public class MainResource {
#XmlRootElement
public class Planet {
public int id;
public String name;
public double radius;
}
#GET
#Produces(MediaType.APPLICATION_XML)
public Planet getPlanet() {
final Planet planet = new Planet();
planet.id = 1;
planet.name = "Earth";
planet.radius = 1.0;
return planet;
}
}
And when I run the tomcat server, the log is like this:
09-Jan-2015 13:19:10.501 INFO [http-apr-8080-exec-8] org.glassfish.jersey.filter.LoggingFilter.log 1 * Server has received a request on thread http-apr-8080-exec-8
1 > GET http://localhost:8080/rest/main
1 > accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
1 > accept-encoding: gzip, deflate, sdch
1 > accept-language: en,zh-CN;q=0.8,zh;q=0.6
1 > connection: keep-alive
1 > cookie: JSESSIONID=69F79D567E7ECA27A129C477B91C7758
1 > host: localhost:8080
1 > user-agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36
09-Jan-2015 13:19:10.597 INFO [http-apr-8080-exec-8] org.glassfish.jersey.filter.LoggingFilter.log 1 * Server responded with a response on thread http-apr-8080-exec-8
1 < 200
1 < Content-Type: application/xml
09-Jan-2015 13:19:10.794 INFO [http-apr-8080-exec-8] org.glassfish.jersey.filter.LoggingFilter.log 2 * Server responded with a response on thread http-apr-8080-exec-8
2 < 500
I wonder why it shows 500 error, but I cannot find any error log about the exception stack.
Please help me.

Answer 1

I fixed my issue and I answer my own question now.
First, how can I enable the exception trace logging?
#Provider
public class ExceptionMapper implements javax.ws.rs.ext.ExceptionMapper<Exception> {
#Override
public Response toResponse(Exception exception) {
exception.printStackTrace();
return Response.status(500).build();
}
}
Yes, we should implement an ExceptionMapper on my own.
Second, what's the error of my code?
The class Planet should be static.