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https://issues.apache.org/jira/browse/CXF-6297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14390415#comment-14390415
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Sergey Beryozkin commented on CXF-6297:
---------------------------------------
This is not a bug - JAXRSBeanValidationInvoker can take care of it.
Note JAXRSBeanValidationInInterceptor is also a ContainerRequestFilter - so you
can register it as a JAX-RS provider, but ironically, given that post-match
request filters can not be applied to the locators it can not be used to
validate the locators... So registering a custom invoker is the only way to go
to get the subresource locators validated too
> 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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