Before:

<data-source allow="511" blob="false" class="org.gjt.mm.mysql.Driver" clob="false" connectionTimeout="1" custom="useUnicode=true&amp;characterEncoding=UTF-8&amp;useLegacyDatetimeCode=true" database="xxx_3" dbdriver="MySQL" dsn="jdbc:mysql://{host}:{port}/{database}" host="localhost" metaCacheTimeout="60000" name="xxx" param-delimiter="&amp;" param-leading-delimiter="?" param-separator="=" password="xxx" port="3306" storage="false" username="xxx" validate="false"/>

After deleting and re-adding:

<data-source allow="511" always-set-timeout="true" blob="false" class="com.mysql.cj.jdbc.Driver" clob="false" connectionTimeout="1" custom="useUnicode=true&amp;characterEncoding=UTF-8&amp;useLegacyDatetimeCode=true" database="xxx_3" dbdriver="MySQL" dsn="jdbc:mysql://{host}:{port}/{database}" host="localhost" metaCacheTimeout="60000" name="xxx" param-delimiter="&amp;" param-leading-delimiter="?" param-separator="=" password="xxx" port="3306" storage="false" username="xxx" validate="false"/>

After Hibernate fix:

<data-source allow="511" always-set-timeout="true" blob="false" class="com.mysql.cj.jdbc.Driver" clob="false" connectionTimeout="1" custom="useUnicode=true&amp;characterEncoding=UTF-8&amp;useLegacyDatetimeCode=true&amp;nullNamePatternMatchesAll=true" database="xxx_3" dbdriver="MySQL" dsn="jdbc:mysql://{host}:{port}/{database}" host="localhost" metaCacheTimeout="60000" name="xxx" param-delimiter="&amp;" param-leading-delimiter="?" param-separator="=" password="xxx" port="3306" storage="false" username="xxx" validate="false"/>