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What is the output of this code

System.out.println(Math.Sqrt(-4.0))

Ans: NaN.

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

Add allowPublicKeyRetrieval=true to the JDBC URL. jdbc:mysql://localhost:3306/db?allowPublicKeyRetrieval=true&useSSL=false