"error": "Internal Server Error", "exception": "org.springframework.jdbc.BadSqlGrammarException",

"message": "PreparedStatementCallback; bad SQL grammar [SELECT * FROM users WHERE email = ?]; nested exception is java.sql.SQLSyntaxErrorException: Table 'users' not found",

This error message suggests that there is an issue with the SQL syntax used in a prepared statement. Specifically, the SQL query attempted to select data from a table called "users", but the table could not be found in the database. This could be due to a variety of reasons, such as the table not being created yet, or the table being deleted or renamed.

相关问题

This application has no explicit mapping for /error, so you are seeing this as a fallback. Sat Jun 10 23:31:08 CST 2023 There was an unexpected error (type=Internal Server Error, status=500). nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet successfully received from the server was 205 milliseconds ago. The last packet sent successfully to the server was 200 milliseconds ago. ### The error may exist in com/imust/mapper/AdminMapper.java (best guess) ### The error may involve com.imust.mapper.AdminMapper.login ### The error occurred while executing a query ### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet successfully received from the server was 205 milliseconds ago. The last packet sent successfully to the server was 200 milliseconds ago.

这个错误信息看起来是你的应用程序在访问数据库时出现了问题，具体来说是因为无法建立与 MySQL 数据库的连接。

这种情况下，可能是由于 MySQL 数据库实例未运行或网络连接不稳定导致的。你可以尝试以下步骤来解决这个问题：

1. 确认 MySQL 数据库实例已经运行。可以使用 `systemctl status mysql` 命令来检查 MySQL 服务是否正在运行。

2. 检查 MySQL 数据库的网络连接是否正常。尝试使用 `ping` 命令检查 MySQL 数据库的 IP 地址是否能够正常访问，或者使用 `telnet` 命令检查 MySQL 数据库的端口是否能够正常连接。

3. 检查应用程序中使用的数据库连接 URL 是否正确。确保数据库连接 URL 中包含正确的 IP 地址、端口、数据库名称、用户名和密码等信息。

4. 如果网络连接不稳定，可以尝试重新启动 MySQL 数据库实例或者重启服务器以解决问题。

如果以上步骤都无法解决问题，可以考虑检查 MySQL 数据库的日志文件以获取更多信息，或者尝试使用其他数据库连接方式（例如使用连接池等技术）。

Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback. Sun Jul 16 22:40:15 CST 2023 There was an unexpected error (type=Internal Server Error, status=500). nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is 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. ### The error may exist in com/yfs/yfsliving/commodity/dao/CategoryDao.java (best guess) ### The error may involve com.yfs.yfsliving.commodity.dao.CategoryDao.selectList ### The error occurred while executing a query ### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is 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. 是什么原因

根据错误日志显示，这是一个内部服务器错误（Internal Server Error），并且由于无法获取JDBC连接导致的。具体原因是通信链路失败，最后一个成功发送到服务器的数据包距离现在已经超过了0毫秒，数据库驱动程序没有收到来自服务器的任何数据包。

这可能是由于以下几个原因导致的问题：
1. 数据库服务器未启动或不可访问。
2. 数据库连接配置有误，例如错误的主机名、端口号、用户名或密码。
3. 数据库连接超时设置不合理。

您可以尝试以下几个步骤来解决这个问题：
1. 确保数据库服务器正在运行，并且可以通过网络访问。
2. 检查数据库连接配置，确保主机名、端口号、用户名和密码正确。
3. 检查数据库连接超时设置，如果需要，可以适当增加超时时间。

如果问题仍然存在，请提供更多的详细信息，例如完整的错误堆栈跟踪或其他相关的日志信息，以便更好地帮助您解决问题。