Upgraded Spring Boot to 2.4.x

[sathishk]

I upgraded the source to Spring Boot 2.4.3. Faced two issues and resolved with few changes.

Problem 1:

java.sql.SQLNonTransientConnectionException: Public Key Retrieval is not allowed

Fix:

Added allowPublicKeyRetrieval=true as part of JDBC Url. Ref: https://stackoverflow.com/questions/50379839/connection-java-mysql-public-key-retrieval-is-not-allowed

Problem 2:

java.lang.IllegalArgumentException: When allowCredentials is true, allowedOrigins cannot contain the special value "*" since that cannot be set on the "Access-Control-Allow-Origin" response header. To allow credentials to a set of origins, list them explicitly or consider using "allowedOriginPatterns" instead.

Fix:

This is because Spring Boot after 2.4.0 made changes to the way we configure CORS. Ref: https://stackoverflow.com/questions/65582177/spring-boot-cors-issue