EBS 11.5.10.2 Unable to launch form With JRE8 Code Signed

Hi All Gurus,

We have signed Our EBS 11.5.10.2 with JRE8, but unfortunately we still unable to launch the form after it was signed.

From the Java Console log we can see the error that we get is

"javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target"

Steps that we did to signed the jar with JRE8 :

1.Apply patch 17191279 & 19725648

2. Run autoconfig on all nodes

3. Copy adkeystore.dat and adsign.txt from other instance that have the JRE8 code signed

4. Sign jarfiles

Anyone have this issue before or can give me a hint where is the issue is.