Unknown character set: 'utf8mb4' 这是数据库报的错吧把你的mysql-connector-java的jar包。
Unknown character set: 'utf8mb4'
org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown character set: 'utf8mb4'at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
atorg.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:382)
atorg.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:456)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:464)
atorg.springframework.jdbc.core.JdbcTemplate.queryForObject(JdbcTemplate.java:472)
atorg.springframework.jdbc.core.JdbcTemplate.queryForObject(JdbcTemplate.java:477)
atorg.springframework.jdbc.core.JdbcTemplate.queryForInt(JdbcTemplate.java:486)
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