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https://issues.apache.org/jira/browse/CXF-6297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14380036#comment-14380036
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Dmitry Kozlov commented on CXF-6297:
------------------------------------
It may have something to do with the way Jersey resolves annotations. It gets
really confused when annotations are defined in resource interfaces rather than
classes.
And above (global filter to be applied only once) might be the side-effect of
the same.
> JAX-RS BeanValidation feature fails with NPE in
> JAXRSBeanValidationOutInterceptor on sub-resource call
> ------------------------------------------------------------------------------------------------------
>
> Key: CXF-6297
> URL: https://issues.apache.org/jira/browse/CXF-6297
> Project: CXF
> Issue Type: Bug
> Components: JAX-RS
> Affects Versions: 3.0.4
> Reporter: Dmitry Kozlov
> Assignee: Sergey Beryozkin
> Fix For: 3.1.0, 3.0.5
>
>
> With {{JAXRSBeanValidationFeature}} enabled CXF fails to process request to
> sub-resource with exception like this:
> {code}
> 23:58:16.049 [qtp457732796-28] WARN o.a.cxf.phase.PhaseInterceptorChain -
> Interceptor for {http://example.com/}MainResource has thrown exception,
> unwinding now
> java.lang.NullPointerException: null
> at
> org.apache.cxf.jaxrs.validation.ValidationUtils.getResourceInstance(ValidationUtils.java:39)
> ~[cxf-rt-frontend-jaxrs-3.0.4.jar:3.0.4]
> at
> org.apache.cxf.jaxrs.validation.JAXRSBeanValidationOutInterceptor.getServiceObject(JAXRSBeanValidationOutInterceptor.java:44)
> ~[cxf-rt-frontend-jaxrs-3.0.4.jar:3.0.4]
> at
> org.apache.cxf.validation.AbstractValidationInterceptor.handleMessage(AbstractValidationInterceptor.java:60)
> ~[cxf-core-3.0.4.jar:3.0.4]
> at
> org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:307)
> [cxf-core-3.0.4.jar:3.0.4]
> at
> org.apache.cxf.interceptor.OutgoingChainInterceptor.handleMessage(OutgoingChainInterceptor.java:83)
> [cxf-core-3.0.4.jar:3.0.4]
> at
> org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:307)
> [cxf-core-3.0.4.jar:3.0.4]
> at
> org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
> [cxf-core-3.0.4.jar:3.0.4]
> at
> org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:251)
> [cxf-rt-transports-http-3.0.4.jar:3.0.4]
> at
> org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:234)
> [cxf-rt-transports-http-3.0.4.jar:3.0.4]
> at
> org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:208)
> [cxf-rt-transports-http-3.0.4.jar:3.0.4]
> at
> org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:160)
> [cxf-rt-transports-http-3.0.4.jar:3.0.4]
> at
> org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:171)
> [cxf-rt-transports-http-3.0.4.jar:3.0.4]
> at
> org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:293)
> [cxf-rt-transports-http-3.0.4.jar:3.0.4]
> at
> org.apache.cxf.transport.servlet.AbstractHTTPServlet.doGet(AbstractHTTPServlet.java:217)
> [cxf-rt-transports-http-3.0.4.jar:3.0.4]
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
> [javax.servlet-api-3.1.0.jar:3.1.0]
> at
> org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:268)
> [cxf-rt-transports-http-3.0.4.jar:3.0.4]
> ...
> {code}
> The example resource code:
> {code}
> @Path("/main")
> public interface MainResource {
> @Path("/sub/{id}")
> SubResource subResource(@PathParam @Size(min=3, max=255) String id);
> }
> -----
> public interface SubResource {
> @GET
> @Path("/items")
> List<String> items();
> }
> GET http://example.com/main/sub/123/items
> {code}
> NPE happens at
> [ValidationUtils.java:39|https://github.com/apache/cxf/blob/c79696bfc1aee1d1204cbd592f6bc5c83c0d9dae/rt/frontend/jaxrs/src/main/java/org/apache/cxf/jaxrs/validation/ValidationUtils.java#L39],
> since {{resourceProvider}} retrieved on previous line is {{null}}:
> {code:java|firstline=33|highlight=39}
> public static Object getResourceInstance(Message message) {
> final OperationResourceInfo ori =
> message.getExchange().get(OperationResourceInfo.class);
> if (ori == null) {
> return null;
> }
> final ResourceProvider resourceProvider =
> ori.getClassResourceInfo().getResourceProvider();
> if (!resourceProvider.isSingleton()) {
> String error = "Service object is not a singleton, use a custom
> invoker to validate";
> LOG.warning(error);
> return null;
> } else {
> return resourceProvider.getInstance(message);
> }
> {code}
> This happens only during invocation of {{JAXRSBeanValidationOutInterceptor}}
> and only when calling sub-resources as in example above.
> h3. Partial Workaround
> The partial workaround is to enable in-interceptor only. But this won't work
> for people wishing to validate response entities as well.
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