Servlet.service() for servlet [dispatcherServlet] in context with path [/cod] threw exception

Servlet.service() for servlet [dispatcherServlet] in context with path [/cod] threw exception是指在处理请求时出现了异常。具体的异常信息是由引用和引用提供的。

根据引用中的错误信息，可以看出在处理请求时发生了错误。而引用提供了更具体的异常信息，指出了出现了org.springframework.dao.DataIntegrityViolationException: Error attempting to get column 'title' from result set. Cause: java.sql.SQLDataException: Cannot determine value type from string '数学'的异常。这个异常可能是由于在从结果集中获取列'title'的值时，出现了数据完整性违规的异常。具体是由于字符串'value'的值无法确定其数据类型导致的。

要解决这个异常，可以尝试检查相关的数据库表和实体类的映射关系，确保数据类型的一致性。另外，还可以检查在处理请求时是否有其他的异常抛出，以及在处理请求之前是否进行了正确的配置。引用提供了一个可能的解决方案，即通过配置JAVA_OPTS="-Djava.awt.headless=true"来解决相关问题。重新启动服务后进行测试，看是否能够正常运行。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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