I'm new at I'm trying to migrate from tomcat to jboss and I get this error Does anyone have an idea what can it be?

17:35:35,232 ERROR  [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/Metricas].[Mtr_carga_archivo_datos]] (http--0.0.0.0-8080-4)  Servlet.s

ervice() for servlet Mtr_carga_archivo_datos threw exception:  java.lang.Error: Unresolved compilation problems:

        DiskFileUpload cannot be resolved to a type

        DiskFileUpload cannot be resolved to a type

        FileItem cannot be resolved to a type

        FileItem cannot be resolved to a type

        at  metricaBean.Mtr_carga_archivo_datos.service(Mtr_carga_archivo_datos.java:42)  [classes:]

        at  javax.servlet.http.HttpServlet.service(HttpServlet.java:847)  [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]

        at  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329)  [jbossweb-7.0.13.Final.jar:]

        at  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)  [jbossweb-7.0.13.Final.jar:]

        at  org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)  [jbossweb-7.0.13.Final.jar:]

        at  org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)  [jbossweb-7.0.13.Final.jar:]

        at  org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)  [jboss-as-web-7.1.1.Final.jar:7.1.1.Fin

al]

        at  org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)  [jbossweb-7.0.13.Final.jar:]

        at  org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)  [jbossweb-7.0.13.Final.jar:]

        at  org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)  [jbossweb-7.0.13.Final.jar:]

        at  org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)  [jbossweb-7.0.13.Final.jar:]

        at  org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)  [jbossweb-7.0.13.Final.jar:]

        at  org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671)  [jbossweb-7.0.13.Final.jar:]

        at  org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930)  [jbossweb-7.0.13.Final.jar:]

        at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_95]