Appian 20.1 Installation MySQL connectivity error

  <Resource name="jdbc/AppianDS"
    factory="com.appiancorp.tomcat.datasource.EncodedPasswordDataSourceFactory"
    type="javax.sql.DataSource"
    driverClassName="com.mysql.jdbc.Driver"
    url="jdbc:mysql://localhost:3306/appian?useOldAliasMetadataBehavior=true"
    username="root"
    password="Hw5Z//sdbFg="
    initialSize="5"
    maxTotal="100"
    defaultTransactionIsolation="READ_COMMITTED"
    maxWaitMillis="30000"
    minIdle="5"
    minEvictableIdleTimeMillis="90000"
    timeBetweenEvictionRunsMillis="450000"
    numTestsPerEvictionRun="100"
    accessToUnderlyingConnectionAllowed="true"
    validationQuery="SELECT 1"
    testOnBorrow="true"
  />