com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server

Client with IP address '183.2xx.xx.xx' is not allowed to connect to this MySQL server.

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="//maven.apache.org/POM/4.0.0" xmlns:xsi="//www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="//maven.apache.org/POM/4.0.0 //maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>

    <properties>
        <java.version>1.8</java.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.20</version>
        </dependency>
    </dependencies>
</project>

    public static void main(String[] args) {
        String url = "jdbc:mysql://xxxxxx.mysql.database.chinacloudapi.cn:3306/xxxxxx?useSSL=true&requireSSL=false&characterEncoding=utf8&serverTimezone=UTC";
        String username = "xxxxxx@xxxxxx";
        String password = "xxxxxxxxxxxx";
        try {
            Connection connection = DriverManager.getConnection(url, username, password);
            System.out.println(connection.getMetaData().getURL());
            connection.close();
            System.out.println("connected!");
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            System.out.println(e.getMessage());
            return; // return because nothing can be done w/out a connection
        }

    }