什么是subsignature和return-type-substitutable

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四月 08, 2016 4:35:34 下午 org.apache.catalina.core.ApplicationDispatcher invoke严重: Servlet.service() for servlet jsp threw exceptionorg.apache.jasper.JasperException: Unable to compile class for JSP: An error occurred at line: [39] in the generated java…

Generic method return type

Here's the Animal class: public class Animal{ private Map<String,Animal> friends =new HashMap<String,Animal>(); public void addFriend(String name,Animal animal){ friends.put(name,animal);} public Animal callFriend(String name){return friends.g…

c++11: trailing return type in functions（函数返回类型后置）

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solr6.3 + Hbase Indexer使用MR创建索引，错误Bad return type

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delete attempted to return null from a method with a primitive return type (int)

今天被自己给蠢死了今天在代码中遇到这个错误, 百度翻译一下:映射方法,从一org.system.mapper.child.chmorganizationexaminationmapper.delete返回零作为一个原始的方法的返回类型(int). org.apache.ibatis.binding.BindingException: Mapper method 'org.system.mapper.child.ChmOrganizationExaminationMapper.delete at…

rg.apache.ibatis.binding.BindingException: Mapper method 'com.dao.Cameao.getOnlineDayRation attempted to return null from a method with a primitive return type (float)

本文为博主原创,未经允许不得转载: 异常展示如下: org.apache.ibatis.binding.BindingException: Mapper method 'com.dao.Cameao.getOnlineDayRation attempted to return null from a method with a primitive return type (float). at org.apache.ibatis.binding.MapperMethod.execute(Mapp…