使用jdbc连接postgresql数据库时报错如下：

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:

### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (????????: ?????? "uav_test " ??????)

### The error may exist in file [G:\Uav\NewMavenDemo\target\classes\mapper\UserMapper.xml]

### The error may involve UserMapper.getUserInfo

### The error occurred while executing a query

### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (????????: ?????? "uav_test " ??????)

at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:79)

at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:447)

at com.sun.proxy.$Proxy27.selectList(Unknown Source)

关键的报错信息：Cannot create PoolableConnectionFactory (????????: ?????? "uav_test " ??????)

连接的参数如下：

#Postgresql

driver=org.postgresql.Driver

url=jdbc:postgresql://localhost:5432/uav_test

username=postgres

password=root

dialect=postgresql

当我把postgresql数据库改为使用mysql时就没有问题，mysql时的参数：

driver=com.mysql.jdbc.Driver

url=jdbc:mysql://localhost:3306/mysql

username=root

password=root

dialect=mysql

不太明白为什么会出现此种情况