无法使用JDBC连接到mySql docker容器

Question

我使用Docker Maven插件

当测试集成开始时,我可以使用以下命令连接到终端上的容器上的mysql:

mysql -h 127.0.0.1 -P 32795 -uroot -p

并且每一件事情都很好,但是当我想用java代码连接这个代码时,在java应用程序中连接mysql:

Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection connection = DriverManager.getConnection(
    "jdbc:mysql://127.0.0.1:" + System.getProperty("mysqlPort") + "/dashboardmanager",
    "root",
    "root"
);

我收到此错误:

org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: Cannot create PoolableConnectionFactory (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.)
    at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80) ~[spring-jdbc-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:615) ~[spring-jdbc-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:866) ~[spring-jdbc-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:927) ~[spring-jdbc-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:937) ~[spring-jdbc-4.2.4.RELEASE.jar:4.2.4.RELEASE]

我试过了:

export _JAVA_OPTIONS="-Djava.net.preferIPv4Stack=true"

和

System.setProperty("java.net.preferIPv4Stack" , "true");

但没有改变.

Docker Maven插件 Conf:

<plugin>
            <groupId>org.jolokia</groupId>
            <artifactId>docker-maven-plugin</artifactId>
            <version>${docker-maven-plugin.version}</version>
            <configuration>
                <images>
                    <image>
                        <name>mysql:5.7.11</name>
                        <run>
                            <env>
                                <MYSQL_ROOT_PASSWORD>root</MYSQL_ROOT_PASSWORD>
                                <MYSQL_DATABASE>dashboardmanager</MYSQL_DATABASE>
                            </env>
                            <ports>
                                <port>mysqlPort:3306</port>
                            </ports>
                        </run>
                    </image>
                </images>
            </configuration>
            <executions>
                <execution>
                    <id>start</id>
                    <phase>pre-integration-test</phase>
                    <goals>
                        <goal>start</goal>
                    </goals>
                </execution>
                <execution>
                    <id>stop</id>
                    <phase>post-integration-test</phase>
                    <goals>
                        <goal>stop</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

Answer 1

问题是这样的：

MySql 启动过程大约需要 40 秒，所以我应该停留大约 40 秒，然后尝试连接到 mySql，就这么简单:)

或者我可以在 pom.xml 中使用这些设置：

<image>
    <name>mysql:5.7.11</name>
    <alias>mysqlContainer</alias>
    <run>
        <env>
            <MYSQL_ROOT_PASSWORD>root</MYSQL_ROOT_PASSWORD>
            <MYSQL_DATABASE>dashboard</MYSQL_DATABASE>
        </env>
        <ports>
            <port>mysqlPort:3306</port>
        </ports>
        <wait>
            <log>.*port: 3306  MySQL Community Server.*</log>
            <time>120000</time>
        </wait>
    </run>
</image>