I am trying to set up a Jersey ClientResponseFilter. It is working fine, but I want to deserialize my request parameters into a String so I can write helpful messages into a log file containing the actual data.
I was thinking about using MessageBodyWorkers for this. As this link below says: "In case you need to directly work with JAX-RS entity providers, for example to serialize an entity in your resource method, filter or in a composite entity provider, you would need to perform quite a lot of steps."
Source: 7.4. Jersey MessageBodyWorkers API
This is exactly what I want to prevent.
So I was thinking about injecting the messagebodyworkers into my filter like this:
package somepackage.client.response;
import java.io.IOException;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.client.ClientRequestContext;
import javax.ws.rs.client.ClientResponseContext;
import javax.ws.rs.client.ClientResponseFilter;
import javax.ws.rs.core.Context;
import javax.ws.rs.ext.Provider;
import org.glassfish.jersey.message.MessageBodyWorkers;
import org.slf4j.Logger;
@Provider
public class ResponseFilter implements ClientResponseFilter {
// TODO: these workers are not injected
@Context
private MessageBodyWorkers workers;
private final Logger logger;
public ResponseFilter(Logger logger) {
this.logger = logger;
}
@Override
public void filter(ClientRequestContext requestContext, ClientResponseContext responseContext)
throws IOException {
if (responseValid(responseContext)) {
return;
}
logger.error("Error", "Some param");
}
private boolean responseValid(ClientResponseContext responseContext) {
if (responseContext.getStatus() == HttpServletResponse.SC_OK) {
return true;
}
return false;
}
}
But the reference is always null and remains null. Note that this filter is running in a standalone application, no servlet container is available.
Why isn't the annotation working in this case? How can I make it work? Or if making this approach to work is impossible, how can I work around this?
Any suggestions?
OK. Here is the workaround solution for the problem above: we should use @Inject and the HK2 Dependency Injection Kernel
HK2 Dependency Injection Kernel Link
First we need to make some changes to the filter:
package somepackage.client.response;
import java.io.IOException;
import javax.inject.Inject;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.client.ClientRequestContext;
import javax.ws.rs.client.ClientResponseContext;
import javax.ws.rs.client.ClientResponseFilter;
import org.glassfish.jersey.message.MessageBodyWorkers;
import org.slf4j.Logger;
public class ResponseFilter implements ClientResponseFilter {
@Inject
private MessageBodyWorkers workers;
private Logger logger;
@Override
public void filter(ClientRequestContext requestContext, ClientResponseContext responseContext)
throws IOException {
if (responseValid(responseContext)) {
return;
}
logger.error("Error", "Some param");
}
private boolean responseValid(ClientResponseContext responseContext) {
if (responseContext.getStatus() == HttpServletResponse.SC_OK) {
return true;
}
return false;
}
public void setLogger(Logger logger) {
this.logger = logger;
}
}
As you can see the constructor changed, the class uses the default constructor, and the annotation changed to @Inject. Be aware that there are two @Inject annotations with the same name. Make sure you use: javax.inject.Inject.
Then we need to implement org.glassfish.hk2.utilities.binding.AbstractBinder:
package somepackage.client;
import org.glassfish.hk2.utilities.binding.AbstractBinder;
import org.glassfish.jersey.message.MessageBodyWorkers;
import org.glassfish.jersey.message.internal.MessageBodyFactory;
public class Binder extends AbstractBinder {
@Override
protected void configure() {
bind(MessageBodyFactory.class).to(MessageBodyWorkers.class);
}
}
And finally we should register the filter and our binder in the client:
...
client.register(ResponseFilter.class);
client.register(new SitemapBinder());
...
Then the worker is going to be injected fine.
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