Spirng配置类连接数据库出现url错误，

通过xml配置文件，连接数据库代码，这样是可以正常的

<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
      destroy-method="close">
    <property name="url" value="jdbc:mysql://localhost:3306/user_db?useSSL=false&amp;allowPublicKeyRetrieval=true&amp;serverTimezone=UTC"></property>
    <property name="username" value="root"></property>
    <property name="password" value="ztbdlb"></property>
    <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"></property>

</bean>

后来用了配置类来创建数据库连接，代码如下
@Bean
public DruidDataSource getDruidDataSource(){
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/user_db?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC");
dataSource.setUsername("root");
dataSource.setPassword("ztbdlb");
return dataSource;
}
然后就出错了
create connection SQLException, url: jdbc:mysql://localhost:3306/user_db?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC, errorCode 0, state 08001
java.sql.SQLNonTransientConnectionException: Cannot load connection class because of underlying exception: com.mysql.cj.exceptions.WrongArgumentException: Malformed database URL, failed to parse the connection string near ';allowPublicKeyRetrieval=true&serverTimezone=UTC'.
后来把url修改一下就好了
修改前：jdbc:mysql://localhost:3306/user_db?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC
修改后：jdbc:mysql://localhost:3306/user_db
求解释一下吗