I have got a VM has APPS 12.1.3 installed on Redhat 6 with JDK 1.5.0_08 (bin directory located under /appl01/apps/tech_st/10.1.3/appsutil/jdk)
I downloaded the latest version of JDK which is 1.8.0_72 , rename the JDK directory to OLD and created a new JDK directory that contains all directories and files in the 1.8 zip file.
Restarted the server and tried to access apps home page , but i get http 500 error, when I revert back the old JDK it works.
Any help is highly appreciated.
I'm not sure if JDK 8 is certified with EBS 12.1.
However, you can refer below doc:
Using JDK 7.0 Latest Update with Oracle E-Business Suite Release 12.0 and 12.1 (Doc ID 1467892.1)