After some time oxauth running keys idToken can't be issued due to keys problem

[yuriyz]

Describe the issue

After some time oxauth fails to issue id_token because it can't find key by alias in keystore.

2019-12-12 12:17:23,936 ERROR [qtp105704967-11] [org.gluu.oxauth.model.crypto.OxAuthCryptoProvider] (OxAuthCryptoProvider.java:229) - Failed to find private key by kid: 6c81445b-19cb-4d4e-9e27-9e0568840c91_sig_rs256, signatureAlgorithm: RS256(check whether web keys JSON in persistence corresponds to keystore file.)
2019-12-12 12:17:23,936 ERROR [qtp105704967-11] [org.gluu.oxauth.model.common.AuthorizationGrant] (AuthorizationGrant.java:266) - Failed to find private key by kid: 6c81445b-19cb-4d4e-9e27-9e0568840c91_sig_rs256, signatureAlgorithm: RS256(check whether web keys JSON in persistence corresponds to keystore file.)
java.lang.RuntimeException: Failed to find private key by kid: 6c81445b-19cb-4d4e-9e27-9e0568840c91_sig_rs256, signatureAlgorithm: RS256(check whether web keys JSON in persistence corresponds to keystore file.)

Steps To Reproduce

No steps, it happens randomly.

[yuriyz]

Fixed in master and 4.1. (Also created patched version for 4.0 customers https://ox.gluu.org/maven/org/gluu/oxauth-server/4.0.Final.patch1/oxauth-server-4.0.Final.patch1.war)