I have updated our Dev Weblogic instance from Proprietary information hidden to Proprietary information hidden and post deployment restart that application is inaccessible. We are getting an error when attempting to access the application see attached for fuller section: 

Wed Mar 04 08:41:32 EST 2020. Pega 7.40 PRPC-7.4.0-185

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Details:java.lang.RuntimeException : Problem during method invocation (doPost)

java.lang.RuntimeException: Problem during method invocation (doPost)

               at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:279)

               at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doPost(WebStandardBoot.java:129)

               at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doGet(WebStandardBoot.java:100)

               at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)

               at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)

               at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:286)

               at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:260)

               at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:137)

from logs it appears that post upgrade we are no longer able to access the DB in order to get the bootstrap loaded. Is this due to lack of support for Proprietary information hidden even though the PRPC 7.* doc states 7.4 does support 12.2.1 versions.