Failed to close server connection after message failures; nested exception is javax.mail.MessagingException: Can't send command to SMTP host;

这个错误通常是由于与 SMTP 服务器的连接问题引起的。可能是由于网络问题，SMTP 服务器无法连接，或者是由于身份验证问题或SMTP服务器配置错误导致的。以下是可能的解决方法：

1. 检查你的网络连接，确保你的网络连接正常。

2. 检查 SMTP 服务器的设置是否正确，并且使用正确的端口和协议（通常是端口25或465，协议是SMTP或SMTPS）。

3. 检查你的 SMTP 服务器是否需要身份验证，并且使用正确的用户名和密码。

4. 如果你使用的是防火墙或其他网络安全设备，请确保它们不会阻止你的 SMTP 流量。

5. 如果你使用的是第三方 SMTP 服务器，请联系其支持团队以获取更多帮助。

希望这些解决方案能够帮助你解决这个问题。

相关问题

System has not been booted with systemd as init system (PID 1). Can't operate. Failed to connect to bus: Host is down. How to solve this problem?

The error message you mentioned typically indicates that the system is not using systemd as the init system. This can happen if your system is using a different init system or if there is a problem with the init system configuration.

To resolve this issue, you can try the following steps:

1. Check the init system: Confirm which init system your system is using. You can do this by running the following command:

   ps -p 1 -o comm=

This command will display the name of the init system in use.

2. Restart the init system: If your system is using systemd, you can try restarting it by running the following command:

   sudo systemctl daemon-reexec

3. Verify init system configuration: If your system is using systemd, ensure that the systemd configuration files are intact. You can check the status of systemd services by running:

   sudo systemctl status <service-name>

Replace `<service-name>` with the actual service name, such as `networkd` or `systemd-journald`. Look for any error messages or failures in the output.

4. Check for system updates: Ensure that your system is up to date with the latest software updates. Run the appropriate command for your distribution, such as `sudo apt update && sudo apt upgrade` for Ubuntu-based systems.

If none of these steps resolve the issue, it might be necessary to provide more specific details or consult with your system administrator for further assistance.

There are test failures. Please refer to D:\idea\demo\target\surefire-reports for the individual test results.

在使用maven的package命令打包时，如果出现"There are test failures"的错误提示，可以参考以下解决方法。首先，你可以查看目录D:\idea\demo\target\surefire-reports，这个目录中会有关于每个测试用例的详细结果报告。\[1\]另外，你也可以尝试使用以下命令来解决这个问题：命令1：mvn package -Dmaven.test.skip=true，这个命令会跳过执行测试用例，也不会编译测试用例。命令2：mvn package -DskipTests，这个命令会跳过执行测试用例，但会编译测试用例（如果编译也报错，可以尝试使用命令1）。命令3：mvn package -Dmaven.test.failure.ignore=true，这个命令会忽略测试用例的错误，即使有失败的测试用例也会继续构建。另外，你还可以在pom文件中添加相应的插件来解决这个问题。\[2\]希望这些方法能够帮助你解决测试失败的问题。
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