Migração para o Jboss 4.3 - Pq ele é tão chato

Pessoal,
Estamos migrando algumas aplicações do Jboss 4.0.3 para o 4.3 e estamos tento problemas para esse novo Jboss encontrar as classes. Pq isso ocorre? alguém sabe de algum tutorial de migração? Segue um exemplo de erro:
12:10:24,575 ERROR [ContainerBase] Servlet.service() for servlet jsp threw exception

java.lang.ClassNotFoundException: org.apache.jsp.jsp.previewEditar_jsp

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:134)

at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)

at org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:598)

at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:144)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:323)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:173)

at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)

at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)

at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)

at java.lang.Thread.run(Unknown Source)

12:10:24,388 ERROR [ContainerBase] Servlet.service() for servlet jsp threw exception

java.lang.ClassNotFoundException: org.apache.jsp.jsp.previewEditar_jsp

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:134)

at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)

at org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:598)

at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:144)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:323)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:173)

at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)

at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)

at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)

at java.lang.Thread.run(Unknown Source)
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