I have a webapp that runs fine in JBoss EAP 6.4. I want to add some functionality to my webapp so that it can process Parquet files that reside in AzureBlob storage. I add a single dependency to my pom.xml:
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-azure</artifactId>
<version>3.1.0</version>
</dependency>
If I now try to start my webapp, it fails at start up:
09:29:43,703 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-10) MSC000001: Failed to start service jboss.deployment.unit."myApp-0.0.1-SNAPSHOT.war".POST_MODULE: org.jboss.msc.service.StartException in service jboss.deployment.unit."myApp-0.0.1-SNAPSHOT.war".POST_MODULE: JBAS018733: Failed to process phase POST_MODULE of deployment "myApp-0.0.1-SNAPSHOT.war" at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:166) [jboss-as-server-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21] at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1980) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1] ... Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: JBAS011232: Only one JAX-RS Application Class allowed. com.sun.jersey.api.core.ResourceConfig com.sun.jersey.api.core.DefaultResourceConfig com.sun.jersey.api.core.PackagesResourceConfig com.mycompany.myapp.rest.RestApplication com.sun.jersey.api.core.ClassNamesResourceConfig com.sun.jersey.api.core.ScanningResourceConfig com.sun.jersey.api.core.servlet.WebAppResourceConfig com.sun.jersey.api.core.ApplicationAdapter com.sun.jersey.server.impl.application.DeferredResourceConfig com.sun.jersey.api.core.ClasspathResourceConfig at org.jboss.as.jaxrs.deployment.JaxrsScanningProcessor.scan(JaxrsScanningProcessor.java:206) at org.jboss.as.jaxrs.deployment.JaxrsScanningProcessor.deploy(JaxrsScanningProcessor.java:104) at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:159) [jboss-as-server-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21] ... 5 more
09:29:43,709 ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) JBAS014612: Operation ("deploy") failed - address: ([("deployment" => "myApp-0.0.1-SNAPSHOT.war")]) - failure description: {"JBAS014671: Failed services" => {"jboss.deployment.unit."myApp-0.0.1-SNAPSHOT.war".POST_MODULE" => "org.jboss.msc.service.StartException in service jboss.deployment.unit."myApp-0.0.1-SNAPSHOT.war".POST_MODULE: JBAS018733: Failed to process phase POST_MODULE of deployment "myApp-0.0.1-SNAPSHOT.war" Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: JBAS011232: Only one JAX-RS Application Class allowed. com.sun.jersey.api.core.ResourceConfig com.sun.jersey.api.core.DefaultResourceConfig com.sun.jersey.api.core.PackagesResourceConfig com.mycompany.myapp.rest.RestApplication com.sun.jersey.api.core.ClassNamesResourceConfig com.sun.jersey.api.core.ScanningResourceConfig com.sun.jersey.api.core.servlet.WebAppResourceConfig com.sun.jersey.api.core.ApplicationAdapter com.sun.jersey.server.impl.application.DeferredResourceConfig com.sun.jersey.api.core.ClasspathResourceConfig"}}
The message "JBAS011232: Only one JAX-RS Application Class allowed" seems to be caused by my webapp trying to use both RestEasy and Jersey. JBoss uses RestEasy by default. Apparently, hadoop-azure must have a Jersey application class. How can I eliminate this problem by indicating that I don't want to use the Jersey-based application class?
hadoop-azure pulls in hadoop-common, which pulls in Jersey. In the version of hadoop-azure you're using, hadoop-common is in compile <scope>. In new version, it is in provided scope. So you can just upgrade the hadoop-azure dependency to the latest one. If you need hadoop-common to compile, then you can redeclare hadoop-common and put it in provided scope.