Blank login page in Oracle applications Release 12

When the apps URL is entered in the web browser, A blank login page is returned. The application.log under $INST_TOP//logs/ora/10.1.3/j2ee/oacore/oacore_default_group_1 shows the following error message similar to the one below.
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javax.servlet.ServletException: oracle.classloader.util.AnnotatedClassNotFoundException:
Missing class: _AppsLocalLogin
Dependent class: oracle.jsp.runtimev2.JspPageInfo Loader: oc4j:10.1.3 Code-Source: /u02/oracle/RE12/apps/tech_st/10.1.3/j2ee/home/lib/ojsp.jar Configuration: in META-INF/boot.xml in /u02/oracle/RE12/apps/tech_st/10.1.3/j2ee/home/oc4j.jar
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To solve the issue, Recompile the JSP’s by issuing the following command the the linux prompt.
perl $FND_TOP/patch/115/bin/ojspCompile.pl --compile --flush -p 20