JAX-RS Executes resource method even when input validation fails ---------------------------------------------------------------- Key: WFLY-8209 URL: https://issues.jboss.org/browse/WFLY-8209 Project: WildFly Issue Type: Bug Components: REST Affects Versions: 10.1.0.Final Reporter: John Hovell Assignee: Alessio Soldano I have created an example which is actually a fork of the Wildfly Swarm repo. I could re-create the example: https://github.com/jhovell/wildfly-swarm-examples/tree/jaxrs-validation (project in subfolder jaxrs/jaxrs-cdi). The tip of this branch shows it is working in WF 10.0. The commit earlier shows it broken in WF 10.1. If a JAX-RS resource is defined as an interface with an implementation that doesn't have a single arg constructor, in WF 10.0 you had to work around the issue in a roundabout way by extending the Application class, using the BeanManager to get the actual bean (not the proxy) and register it with JAX-RS. This seemed to be the only solution as even if you made a bean with a @Produces method on a managed bean, Resteasy still wouldn't know how to construct the bean. You get a fairly generic error that Resteasy can't find a constructor for the implementation (not the interface). See error below. Despite being roundabout, this worked. In WF 10.1 the behavior is very surprising in that it executes the resource method even though input validation failed, and then it returns a 400 with a validation message (as expected) but with the nasty side effect that the resource method was executed (and it may have crashed due to null pointers, in which case the user gets 500 instead of 400). [pre] 2017-02-22 19:26:08,213 ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 5) MSC000001: Failed to start service jboss.undertow.deployment.default-server.default-host./: org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host./: java.lang.RuntimeException: RESTEASY003190: Could not find constructor for class: org.wildfly.swarm.examples.jaxrs.cdi.api.EmployeeController at org.wildfly.extension.undertow.deployment.UndertowDeploymentService$1.run(UndertowDeploymentService.java:85) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) at org.jboss.threads.JBossThread.run(JBossThread.java:320) Caused by: java.lang.RuntimeException: RESTEASY003190: Could not find constructor for class: org.wildfly.swarm.examples.jaxrs.cdi.api.EmployeeController at org.jboss.resteasy.spi.metadata.ResourceBuilder.constructor(ResourceBuilder.java:692) at org.jboss.resteasy.plugins.server.resourcefactory.POJOResourceFactory.registered(POJOResourceFactory.java:42) at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(ResourceMethodRegistry.java:208) at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(ResourceMethodRegistry.java:194) at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(ResourceMethodRegistry.java:180) [pre]