Oracle application R12 login page showing empty (OR)."Internet page cannot displayed the page"

Error in the oacore logfile
====================
/u01/ebsapp/inst/apps/ebstest_apptest/logs/ora/10.1.3/j2ee/oacore/oacore_default_group_1/application.log


at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
at com.evermind[Oracle Containers for J2EE 10g (10.1.3.5.0) ].util.ReleasableResourcePooledExecutor$MyWorker.r
un(ReleasableResourcePooledExecutor.java:303)
at java.lang.Thread.run(Thread.java:662)
13/06/19 08:53:02.860 html: 10.1.3.5.0 Stopped
13/06/19 09:00:12.380 10.1.3.5.0 Started
13/06/19 09:00:15.403 html: Error preloading servlet
javax.servlet.ServletException: undefined main_mode parameter:recomplie
at oracle.jsp.runtimev2.JspServlet.validateAndSetMainMode(JspServlet.java:460)
at oracle.jsp.runtimev2.JspServlet.init(JspServlet.java:255)
at com.evermind.server.http.HttpApplication.loadServlet(HttpApplication.java:2528)
at com.evermind.server.http.HttpApplication.findServlet(HttpApplication.java:5006)
at com.evermind.server.http.HttpApplication.findServlet(HttpApplication.java:4930)
at com.evermind.server.http.HttpApplication.initPreloadServlets(HttpApplication.java:5118)
at com.evermind.server.http.HttpApplication.initDynamic(HttpApplication.java:1283)
at com.evermind.server.http.HttpApplication.(HttpApplication.java:848)
at com.evermind.server.ApplicationStateRunning.getHttpApplication(ApplicationStateRunning.java:435)
at com.evermind.server.Application.getHttpApplication(Application.java:592)
at com.evermind.server.http.HttpSite$HttpApplicationRunTimeReference.createHttpApplicationFromReference(HttpSi
te.java:2280)
at com.evermind.server.http.HttpSite$HttpApplicationRunTimeReference.(HttpSite.java:2199)
at com.evermind.server.http.HttpSite.initApplications(HttpSite.java:701)
at com.evermind.server.http.HttpSite.setConfig(HttpSite.java:308)
at com.evermind.server.http.HttpServer.setSites(HttpServer.java:280)
at com.evermind.server.http.HttpServer.setConfig(HttpServer.java:180)
at com.evermind.server.ApplicationServer.initializeHttp(ApplicationServer.java:2541)
at com.evermind.server.ApplicationServer.setConfig(ApplicationServer.java:1058)
at com.evermind.server.ApplicationServerLauncher.run(ApplicationServerLauncher.java:131)
at java.lang.Thread.run(Thread.java:662)
13/06/19 09:00:19.330 html: 10.1.3.5.0 Started
13/06/19 09:06:37.618 html: Servlet error
java.lang.NullPointerException
at java.io.File.(File.java:222)

Cause: Parameter is not correct in xml file undefined main_mode parameter:recomplie which pointing to opmn.xml
file.

apptest@ctssd $ grep -i s_jsp_main_mode $CONTEXT_FILE
recomplie
apptest@ctssd $

Solution:
1)stop the appliction services
2)change parameter in xml file
3)Run autoconfig.
4)start applicationn services and do sanity checck.
4)after doing above step issue got resolved.