急，求助：Unknown character set index for field '255' received from server.

asdd112322aa 2018-08-03 05:17:50

运行javaweb项目之后，就出现这个问题，mysql使用的是mysql8最新刚从官网下的，驱动也是最新的，然后数据库使用utf-8编码，但是运行了就出现Unknown character set index for field '255' received from server.问题，网上百度各种改编码都不行，求助啊求助啊。

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Sakura路明非 2018-12-11

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把你Web容器（例如Tomcat），webapp下的对应项目删除掉，然后重新部署就好了，应该是tomcat容器为检测到代码变动，没有重新编译导致的，望采纳

maikangzhi 2018-08-03

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我在网上搜，说你的mysql-connection 的jar包的版本太低了，升级一下版本，Tomcat和Java用的都要升级

笔记本的风扇控制 ---------------------------------------- 09 November 2006. Summary of changes for version 20061109: 1) ACPI CA Core Subsystem: Optimized the Load ASL operator in the case where the source operand is an operation region. Simply map the operation region memory, instead of performing a bytewise read. (Region must be of type SystemMemory, see below.) Fixed the Load ASL operator for the case where the source operand is a region field. A buffer object is also allowed as the source operand. BZ 480 Fixed a problem where the Load ASL operator allowed the source operand to be an operation region of any type. It is now restricted to regions of type SystemMemory, as per the ACPI specification. BZ 481 Additional cleanup and optimizations for the new Table Manager code. AcpiEnable will now fail if all of the required ACPI tables are not loaded (FADT, FACS, DSDT). BZ 477 Added #pragma pack(8/4) to acobject.h to ensure that the structures in this header are always compiled as aligned. The ACPI_OPERAND_OBJECT has been manually optimized to be aligned and will not work if it is byte-packed. Example Code and Data Size: These are the sizes for the OS- independent acpica.lib produced by the Microsoft Visual C++ 6.0 32- bit compiler. The debug version of the code includes the debug output trace mechanism and has a much larger code and data size. Previous Release: Non-Debug Version: 78.1K Code, 17.1K Data, 95.2K Total Debug Version: 155.4K Code, 63.1K Data, 218.5K Total Current Release: Non-Debug Version: 77.9K Code, 17.0K Data, 94.9K Total Debug Version: 155.2K Code, 63.1K Data, 218.3K Total 2) iASL Compiler/Disassembler and Tools: Fixed a problem where the presence of the _OSI predefined control method within complex expressions could cause an internal compiler error. AcpiExec: Implemented full region support for multiple address spaces. SpaceId is now part of the REGION object. BZ 429 ---------------------------------------- 11 Oc

启动Java项目是报出 java.sql.SQLException: Unknown character set index for field '255' received from server.的错误该怎么办 1.首先出现这个问题的原因是因为我之前使用的是 Mysql 5.7版本，目前数据库迁移到了 8.0.15上面因为Jar包版本太低所以出现了错误 2.去官网下载...

Mysql java.sql.SQLException: Unknown character set index for field '224' received from server...

连接数据库的时候遇到了如下错误 Cause: java.sql.SQLException: Unknown initial character set index ‘255’ received from server. Initia Unknown initial character set index ‘255’ received from server. Initial client character set can be forced via the ‘characterEncoding’ prop

连接数据库时，出现Unknown character set index for field '255' received from server. 原因是MySQL版本高，mysql的jar版本低造成mysql与jar的编码错乱引起的，我的MYSQL是8.0版本 MYSQL 5.5 之前， UTF8 编码只支持1-3个字节;从MYSQL5.5开始，可支持4个字节UTF编码utf8mb4; ...

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