Wildfly can't deploy REST web service: Could not load JAX-RS Application class

[dean.w.schulze]

I have a simple REST web service that I'm trying to deploy in Wildfly.  Deployment fails with the message below.  Wildfly can't find the JAX-RS Application class.

I downloaded the Java EE7 Full & Web Distribution.  Does that not have a javax.ws.rs.core.Application implementation in it?

My only maven dependency is javaee-api version 7.0 (provided scope).  The .war file I'm deploying only has my two .class files in it (subclass of Application and the Resource .class file).  No web.xml.

Do I have to include a complete jax-rs implementation in my .war file?

Cannot upload deployment: {"WFLYCTL0080: Failed services" => {"jboss.deployment.unit.pdfupload.POST_MODULE" => "WFLYSRV0153: Failed to process phase POST_MODULE of deployment \"pdfupload\" Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: WFLYRS0006: Could not load JAX-RS Application class Caused by: java.lang.ClassNotFoundException: pdf.upload.server.PdfUploadApplication from [Module \"deployment.pdfupload\" from Service Module Loader]"}}

[dean.w.schulze]

Well, this turned out to be caused by changing the Runtime Name in the deployment wizard.  The Verify Upload wizard populates the Name and Runtime Name fields with the .war file name you are uploading.  It allows you to change them, but changing the Runtime Name causes this error.

This is pathological.  If changing the Runtime Name is going to cause deployment to fail then it should not be allowed.

[jaikiran]

You can use a different runtime name for that war deployment. Just make sure the runtime name ends with a .war suffix.  That should get you past this issue.

Having said that, this indeed is a bug (either the UI shouldn't allow such names or the actual code[1] which identifies a deployment unit as a war deployment, needs a way to handle this). Can you file a JIRA here - JBoss Issue Tracker  and add the relevant details and reference this thread in there?

[1] wildfly/WarDeploymentInitializingProcessor.java at master · wildfly/wildfly · GitHub

[jaikiran]

I just noticed that there's already a JIRA created by you for this issue [WFLY-9644] Wildfly 11 can't deploy simple REST web service because it can't find javax.ws.rs.core.Application - JBoss I… .