Guidelines to migrate a Maven Multi module java project From Tomcat To Weblogic?

[Shehzaad khan]

Hi,

I have a maven based multi module project in tomcat which is working and functional. Now I am setting it up to deploy on weblogic 12c using eclipse.

I thought it will be easy but doing so giving lots of errors during deployment on weblogic

My Questions:

1. are there any guidelines to follow when migrating multi module project from Tomcat to Weblogic (using eclipse as IDE)?

2. Does the project building sequence matters during maven build and war preparation?

3. Does below plugins -

maven-compiler-plugin

maven-war-plugin

maven-install-plugin

maven-resources-plugin

jaxb2-maven-plugin

from my main pom.xml file still useful under weblogic server?

NOTE: I have already tried to deploy a simple web application war to weblogic which is working fine.

Whereas Deploying my multi module project war to Weblogic gives me below errors -

<6 May, 2019 2:27:53,346 PM IST> <Error> <Deployer> <BEA-149231> <Unable to set the activation state to true for the application 
weblogic.application.ModuleException: java.lang.IllegalStateException: Cannot set web app root system property when WAR file is not expanded
    at weblogic.application.internal.ExtensibleModuleWrapper.start(ExtensibleModuleWrapper.java:140)
    at weblogic.application.internal.flow.ModuleListenerInvoker.start(ModuleListenerInvoker.java:124)
    at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:233)
    at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:228)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:45)
    Truncated. see log file for complete stacktrace
Caused By: java.lang.IllegalStateException: Cannot set web app root system property when WAR file is not expanded
    at org.springframework.web.util.WebUtils.setWebAppRootSystemProperty(WebUtils.java:139)
    at org.springframework.web.util.Log4jWebConfigurer.initLogging(Log4jWebConfigurer.java:118)
    at org.springframework.web.util.Log4jConfigListener.contextInitialized(Log4jConfigListener.java:47)
    at weblogic.servlet.internal.EventsManager$FireContextListenerAction.run(EventsManager.java:705)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:326)
    Truncated. see log file for complete stacktrace
> <Error> <HTTP> <BEA-101216> <Servlet: "org.apache.cxf.wsn.client.Publisher$PublisherSubscription" failed to preload on startup in Web application
java.lang.NullPointerException
    at org.eclipse.persistence.jaxb.compiler.SchemaGenerator.addGlobalElements(SchemaGenerator.java:852)
    at org.eclipse.persistence.jaxb.compiler.SchemaGenerator.generateSchema(SchemaGenerator.java:158)
    at org.eclipse.persistence.jaxb.compiler.SchemaGenerator.generateSchema(SchemaGenerator.java:142)
    at org.eclipse.persistence.jaxb.compiler.Generator.generateSchemaFiles(Generator.java:221)
    at org.eclipse.persistence.jaxb.JAXBContext.generateSchema(JAXBContext.java:407)
    Truncated. see log file for complete stacktrace