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python闭包
如上所示,printer是内嵌函数(nested function),根据LEGB的E原则,取到了传入的msg参数 如果将print_msg内的printer调用替换成将其返回,赋值到变量another,print another会得到 : <function printer at 0x02666A ...
分类:编程语言   时间:2017-09-23 23:18:06    阅读次数:270
When to Use Nested Classes, Local Classes, Anonymous Classes, and Lambda Expressions
As mentioned in the section Nested Classes, nested classes enable you to logically group classes that are only used in one place, increase the use of ...
分类:其他好文   时间:2017-09-23 19:07:06    阅读次数:126
jdbc连接oracle时报错 Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableC
错误: Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNe ...
分类:数据库   时间:2017-09-23 12:33:05    阅读次数:563
mybatis java.lang.UnsupportedOperationException
mybatis抛出下面的异常: org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: Error querying datab ...
分类:编程语言   时间:2017-09-22 13:10:31    阅读次数:216
Spring boot Thymeleaf 配置
第一步:pom.xml加入依赖 第二步: 修改yml文件 第三步:修改Controller ...
分类:编程语言   时间:2017-09-20 19:39:20    阅读次数:393
Spring Cloud ZooKeeper集成Feign的坑2,服务调用了一次后第二次调用就变成了500,错误:Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is com.n
错误如下: 错误现象: 1、 服务调用了一次后第二次调用就变成了500 2、或者调用的服务直接出现500。错误同样是出现以上信息。 问题排查: 1、排查Spring Cloud的版本问题:Camden.SR7,与这个无关。 2、排查Feign的接口写法问题,也与这个无关。 3、排查引入的包少了,真的 ...
分类:编程语言   时间:2017-09-20 16:30:13    阅读次数:1302
### The error may involve defaultParameterMap ### The error occurred while setting parameters
Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Query was empty; bad SQL grammar []; nested exception is com.mysql.jdbc.exceptions.j ...
分类:其他好文   时间:2017-09-15 10:14:49    阅读次数:2274
Spring MVC集成thymeleaf时提示:defined in ServletContext resource [/WEB-INF/SrpingMVCTest-servlet.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException
错误提示: 解决方法: 由于是从2.0版本升到3.0版本的原因,写法变了,应该在Bean上这样注入: 参考: https://stackoverflow.com/questions/38057341/failed-to-instantiate-org-thymeleaf-templateresolv ...
分类:编程语言   时间:2017-09-14 13:19:23    阅读次数:306
Lintcode 摊平嵌套的列表
1 /** 2 * // This is the interface that allows for creating nested lists. 3 * // You should not implement it, or speculate about its implementation 4 ... ...
分类:其他好文   时间:2017-09-13 01:47:27    阅读次数:253
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