excerpted from Type conversions K&R Section 2.7 p59 对type conversion 的解释: The precise meaning of a cast is as if the expression were assigned to a variable of the specified type, which is then used in place of the whole construction. (类型名) 表达式 将被转换的表
今天在整合ssh三个框架时,有一个功能,是查询所有员工信息,且员工表和部门表是多对一的映射关系,代码能正常运行到查询得到一个List集合,但在页面展示的时候,就报异常了, java.lang.ClassCastException: com.ch.hibernate.Department_$$_javassist_0 cannot be cast to javassist.util.proxy.Proxy 问题应该出在实体类Department上,然后我参照网上的解释,将Department.hb
Login / Register Developer Zone Bugs Home Report a bug Statistics Advanced search Saved searches Tags Bug #73054 CAST function should support INT synonym for SIGNED. i.e. CAST(y AS INT) Submitted: 19 Jun 2014 15:55 Modified: 30 Jun 2014 11:12 Repor
1.Java api public T cast(Object obj); Casts an object to the class or interface represented 解释的比较笼统,意思就是将一个对象装换为类或者接口. 2.代码示例 /** * Created by shengke on 2016/10/22. */ class A { public static void show() { System.out.println("Class A show() function
开发人员测试时,发现生产服务器与测试服务器执行SELECT CAST(GETDATE() AS VARCHAR(10))语句显示的格式不一样.如下所示 Server A Server B 其实出现这个问题,是因为登录名(login)的语言不一致所致,如下所示 可以使用下面SQL语句来检查对应的默认语言 SELECT @@LANGUAGE 或 SELECT loginname,name, language FROM sys.syslogins 上面出现不一致是因为同一登录名的默认语言在服务
背景: 前段时间,业务需要,为了快速让解析的Excel入库,所以把不是很确定的字段全部设置成了TEXT. 今天需要进行表结构优化,把字段长度控制在合适的范围,并尽量不使用TEXT类型. -- 计算长度select LENGTH(CAST(fileName AS CHAR)) from files; select MAX(LENGTH(CAST(fileName AS CHAR))) from files; select LENGTH(CAST(fileName AS CHAR)) as le f
一.错误信息 java.lang.ClassCastException: org.slf4j.impl.Log4jLoggerFactory cannot be cast to ch.qos.logback.classic.LoggerContextat ch.qos.logback.ext.spring.LogbackConfigurer.initLogging(LogbackConfigurer.java:72)at ch.qos.logback.ext.spring.web.WebLogb
java.lang.ClassCastException: android.view.AbsSavedState$1 cannot be cast to android.widget.ProgressBar$SavedState 这个问题折腾了老半天,后来才发现是因为不同布局文件中有重名的控件,而且在要显示的Activity中同时用到了这些布局,所以导致这个问题.
在项目开发中自定义了一个maven plugin,在本地能够很好的工作,但是在ci server上却无法正常工作报错为: ----------------------------------------------------- at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:225) at org.apache.maven.lifecycle.internal.MojoExecutor.
java.lang.ClassCastException: com.sun.proxy.$Proxy32 cannot be cast to com.bkc.bpmp.core.cache.MemcachedManager at com.bkc.bpmp.common.utils.CacheUtils.<clinit>(CacheUtils.java:11) at com.bkc.bpmp.modules.sys.controller.MainController.showCache(Main