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apiman.war deploy failed. Unable to instantiate ExceptionMapper

See original GitHub issue

After the merge of #811 from @volkflo, I’m facing this error after build with mvn clean install -Pinstall-all-wildfly10

Am I doing anything wrong?

15:35:59,919 ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) WFLYCTL0013: Operation ("deploy") failed - address: ([("deployment" => "apiman.war")]) - failure description: {
    "WFLYCTL0080: Failed services" => {"jboss.undertow.deployment.default-server.default-host./apiman" => "org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host./apiman: java.lang.RuntimeException: RESTEASY003925: Unable to instantiate ExceptionMapper
    Caused by: java.lang.RuntimeException: RESTEASY003925: Unable to instantiate ExceptionMapper
    Caused by: org.jboss.weld.exceptions.AmbiguousResolutionException: WELD-001318: Cannot resolve an ambiguous dependency between: 
  - Managed Bean [class io.apiman.manager.api.rest.exceptions.mappers.RestExceptionMapper] with qualifiers [@Any @Default],
  - Managed Bean [class io.apiman.manager.api.rest.exceptions.mappers.RestExceptionMapper] with qualifiers [@Any @Default]"},
    "WFLYCTL0412: Required services that are not installed:" => ["jboss.undertow.deployment.default-server.default-host./apiman"],
    "WFLYCTL0180: Services with missing/unavailable dependencies" => undefined
}

Issue Analytics

State:
Created 4 years ago
Comments:7 (7 by maintainers)

Top GitHub Comments

1reaction

volkflocommented, Mar 11, 2020

Okay, I think I understand this now. Thank you for the detailed explanation. 😃 It is good to know this if there are changes in the future.

0reactions

EricWittmanncommented, Mar 11, 2020

The reason is that in Tomcat we’re not using classpath scanning to discover the JAX-RS classes (resource classes and exception mappers). Instead, the JAX-RS application is configured using a JAX-RS Application class. And in that class is where we list out all of the classes needed by our JAX-RS app. The RestExceptionMapper class is one of the classes included in that collection. Even though there are two of them on the classpath, it doesn’t matter which one is actually used (they are the same). Including a duplicate class on the classpath is obviously still not something you’d want to do…and it could get you in trouble potentially. But in this case that class is only loaded once here: https://github.com/apiman/apiman/blob/master/manager/api/war/tomcat8/src/main/java/io/apiman/manager/api/war/tomcat8/Tomcat8ApiManagerApplication.java#L65

But when running in e.g. WildFly, we use an empty Application class and just let classpath scanning do its thing to find all of the relevant JAX-RS classes: https://github.com/apiman/apiman/blob/master/manager/api/rest-impl/src/main/java/io/apiman/manager/api/rest/impl/ApiManagerApplication.java

So in that context, having a duplicate class on the classpath is problematic because classpath scanning will find them both and realize they do the same thing…and then will fail because it doesn’t know which one to use. Note that I believe it would also fail if you had two exception mappers with different names but that handled the same exception class.

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