How do you deploy a spring boot application to an EAP server?

Question

I am trying to deploy a spring boot application to an EAP 7 server. The application works fine as a standalone application using spring boot's embedded tomcat servlet, but when I try to deploy it as a WAR to EAP 7 I get the following exception:

14:55:11,156 ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 70) MSC000001: Failed to start service jboss.undertow.deployment.default-server.default-host."projectName": org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host."projectName": java.lang.NoClassDefFoundError: org/apache/tomcat/util/res/StringManager
    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:748)
    at org.jboss.threads.JBossThread.run(JBossThread.java:320)
Caused by: java.lang.NoClassDefFoundError: org/apache/tomcat/util/res/StringManager
    at org.apache.tomcat.websocket.WsWebSocketContainer.<clinit>(WsWebSocketContainer.java:78)
    at org.apache.tomcat.websocket.server.WsSci.init(WsSci.java:131)
    at org.apache.tomcat.websocket.server.WsSci.onStartup(WsSci.java:47)
    at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:184)
    at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.startContext(UndertowDeploymentService.java:100)
    at org.wildfly.extension.undertow.deployment.UndertowDeploymentService$1.run(UndertowDeploymentService.java:82)
    ... 6 more
Caused by: java.lang.ClassNotFoundException: org.apache.tomcat.util.res.StringManager from [Module "deployment.projectName.war:main" from Service Module Loader]
    at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:196)
    at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:363)
    at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:351)
    at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:93)
    ... 12 more

14:55:11,156 ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) WFLYCTL0013: Operation ("deploy") failed - address: ([("deployment" => "projectName.war")]) - failure description: {"WFLYCTL0080: Failed services" => {"jboss.undertow.deployment.default-server.default-host.\"projectName"" => "org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host.\"projectName": java.lang.NoClassDefFoundError: org/apache/tomcat/util/res/StringManager
    Caused by: java.lang.NoClassDefFoundError: org/apache/tomcat/util/res/StringManager
    Caused by: java.lang.ClassNotFoundException: org.apache.tomcat.util.res.StringManager from [Module \"deployment.projectName.war:main\" from Service Module Loader]"}}
14:55:11,187 INFO  [org.jboss.as.server] (ServerService Thread Pool -- 37) 
14:55:11,249 INFO  [org.jboss.as.controller] (Controller Boot Thread) WFLYCTL0183: Service status report
WFLYCTL0186:   Services which failed to start:      service jboss.undertow.deployment.default-server.default-host."projectName": org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host."projectName": java.lang.NoClassDefFoundError: org/apache/tomcat/util/res/StringManager

I've done as the spring-boot documentation recommends when converting from a jar file to war.

Specifically, I've declared a dependency on spring-boot-starter-web excluding tomcat:

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency> 

I've also imported the spring-boot-dependencies pom:

<dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.0.4.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
                <exclusions>
                    <exclusion>
                        <groupId>org.springframework.boot</groupId>
                        <artifactId>spring-boot-starter-tomcat</artifactId>
                    </exclusion>

                </exclusions>
            </dependency>

        </dependencies>
    </dependencyManagement>

I also added a dependency to spring-boot-starter-undertow with a scope of provided:

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-undertow</artifactId>
            <scope>provided</scope>
        </dependency>

I removed the spring-boot-maven-plugin and I extended my application class with SpringBootServletInitializer overriding protected SpringApplicationBuilder configure(SpringApplicationBuilder application)

I don't understand why it is not working, so any help would be much appreciated.

Answer 1

Removed undertow dependency, which didn't work at first, but then I closed eclipse and reopened and it worked. I don't really know why it worked, but it did.