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POResteasy does not finds ExceptionMapper provider
 

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    <p>I have tried a lot of things to make this work, but it is not working anyway. Also, I don't find proper documentation about this. I am trying to implement a <code>CustomExceptionMapper</code> for my <code>CustomException</code> type. The <code>CustomException</code> is thrown correctly, but it is not catched.</p> <p>I thought that annotating the <code>CustomExceptionMapper</code> with <code>@Provider</code> was enough, but it isnot detected. I have tried to allow scanning in web.xml, but I've found this: <a href="https://issues.jboss.org/browse/AS7-1739" rel="nofollow">https://issues.jboss.org/browse/AS7-1739</a> . I am using 7.0.1 Final. Probably the solution is changing of version, but this decision is not up to me.</p> <p>I have also found that you can try to override the <code>getClasses()</code> or <code>getSingletons</code> method and add there your <code>CustomExceptionMapper</code>, but it is just not detecting it.</p> <p>How my Application class looks like:</p> <pre><code>import java.util.HashSet; import java.util.Set; import javax.ws.rs.ApplicationPath; import javax.ws.rs.core.Application; @ApplicationPath("/service") public class MyApp extends Application { @Override public Set&lt;Class&lt;?&gt;&gt; getClasses() { Set&lt;Class&lt;?&gt;&gt; classes = new HashSet&lt;Class&lt;?&gt;&gt;(); classes.add(TestExceptionMapper.class); return classes; } } </code></pre> <p>And the Mapper</p> <pre><code>@Provider public class TestExceptionMapper implements ExceptionMapper&lt;TestException&gt; { public Response toResponse(TestException ex) { //something, but I cannot reach it. } } </code></pre> <p>Web.xml</p> <pre><code> &lt;context-param&gt; &lt;param-name&gt;resteasy.providers&lt;/param-name&gt; &lt;param-value&gt;com.mycompany.rest.exceptions.TestExceptionMapper&lt;/param-value&gt; &lt;/context-param&gt; &lt;servlet&gt; &lt;servlet-name&gt;RestletServlet&lt;/servlet-name&gt; &lt;servlet-class&gt;org.restlet.ext.servlet.ServerServlet&lt;/servlet-class&gt; &lt;init-param&gt; &lt;param-name&gt;org.restlet.application&lt;/param-name&gt; &lt;param-value&gt;com.mycompany.rest.application.myApplication&lt;/param-value&gt; &lt;/init-param&gt; &lt;/servlet&gt; </code></pre> <p>And the service which is being called through URL:</p> <pre><code>@Stateless @Path("/somePath") public class someService { @GET //this should be post, but for testing I'm using get @Path("/some/update/someth") @Produces() public String updateSometh(@NotNull @QueryParam("key") String key, @QueryParam(value = "somethID") Long somethID) throws TestException { // .... } </code></pre> <p>If you call this with the correct parameters, it works. But if you put a bad parameter, it does not.<br> I would like to say too that the application is working, but I just wanted to add the Mappers.</p>
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    1. COWhere is your code that throws `TestException`?
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    2. COI am testing what happens when I put a Long parameter with a wrong value (like 120sd instead of just a number). The exception is thrown there, because it cannot be parsed.
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    3. COPlease show the resource code where are you doing this test. I suspect is a problem there as I have a very similar configuration to yours and exception mappers work fine.
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