Gadgets title are showing as __MSG_gadget.xxxxxxx

Summary

After upgrading from JIRA 6.4.x / JIRA 7.0.10 to JIRA 7.1.0, gadgets title are showing as _MSG_gadget.xxxxxxx, MSG_gadget.activity., _MSG_gadget.filter and so on.

Please see the example below for how this appears in JIRA:

Environment

• JIRA 7.1.0
• Running JIRA over SSL/HTTPS

Diagnosis

The following error appears in the atlassian-jira.log:

2016-02-26 14:22:28,843 http-bio-8443-exec-11 ERROR admin 862x395x1 m32d6k 172.22.37.40 /secure/MyJiraHome.jspa [c.a.g.r.internal.http.HttpClientFetcher] Unable to retrieve response
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
	at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)

Steps to Reproduce

Configure JIRA to run over SSL/HTTPS using a self-signed certificate.

Expected Results

Gadget title show correctly.

Actual Results

Gadgets title keys are broken and appear as __MSG_gadget.xxxxxxx

Workaround

• If you are experiencing issues with a self-signed certificates then follow the steps found here to import self-signed certificates.
• If you are experiencing issues related to JIRA not trusting an internal or unknown certificate authority then follow the steps found here for importing a certificate into the trust store to import the certificate authority certificate.
• If you are experiencing issues related to gadgets and SNI(Server Name Indication) you should watch JRA-47568.
• If you are experiencing a different problem than those listed above please open a support ticket at https://support.atlassian.com/contact.

Due to the number of workarounds involved, we've written a KB for this. Please review How to fix gadget titles showing as __MSG_gadget.xxxxxxx for the appropriate steps to take to workaround the issue.