Same classloader for EJB and WAR

https://docs.oracle.com/middleware/1212/wls/WLPRG/classloading.htm#WLPRG293

you can alter the weblogic-application.xml with this

<classloader-structure> 
    <module-ref> 
       <module-uri>ejb1.jar</module-uri> 
    </module-ref>
    <module-ref> 
       <module-uri>web1.war</module-uri> 
    </module-ref>
 </classloader-structure> 

however it's recommended to either put your shared classes in APP-INF/lib, or remove circular dependencies if any