class Person{ private String name ; private String sex ; public Person(){ System.out.println("c"); } public Person(String c1){ this.name =c1; System.out.println("c1"+c1); } public Person(String c1,String c2){ this.name =c1; this.sex =c…

用mybaits 写一个关联查询 查询商品表关联商品规格表,并查询规格表中的数量.价格等,为了sql重用性,利用 association 节点 查询 结果并赋值报错 商品表的mapper文件为GooodsMapper.xml 规格表的mapper 文件为GoodsSpecificationsMapper.xml java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for m…

报错: Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level. java.lang.IllegalArgumentException: Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986-- 错误原因: 当在浏览器中访问时…

启动tomcat的时候报如下错误: java.lang.IllegalArgumentException: Document base F:\java\tools\tomcat\me-webapps\drp1.1 does not exist or is not a readable directory     at org.apache.naming.resources.FileDirContext.setDocBase(FileDirContext.java:142)    at org.a…

我使用的MongoDB版本是3.6.9. 下面是一个很基础的示例代码,功能就是连接MongoDB: package com.zifeiy.snowflake.handle.etl.mongodb; import com.mongodb.MongoClient; public class MongodbTest { public static void main(String[] args) { MongoClient mongoClient = new MongoClient(); } } 但是…

like ‘%java.lang.IllegalArgumentException: Result Maps collection does not contain value for java.lang.Inte%’ --- 改成 resultType…

Exception in thread "main" java.lang.IllegalArgumentException: URLDecoder: Illegal hex characters in escape (%) pattern - For input string: "左右" at java.net.URLDecoder.decode %引起 %会转换成%25 解决方案: public static String replacer(String str)…

项目中遇到的问题 import org.springframework.util.ReflectionUtils; import java.lang.reflect.Method; public class Student { public void contextLoads(Student student) throws ClassNotFoundException, NoSuchMethodException { Class<?> aClass = Class.forName("…

Collections.sort(listMonthlyUsage, new Comparator<MonthlyUsageDto>() { //按照元素从小到大排序 @Override public int compare(MonthlyUsageDto o1, MonthlyUsageDto o2) { if(o1.getCstId() > o2.getCstId()) return 1; else return -1; // return o1.getCstId() - o2.ge…

在使用spark on yarn启动spark-shell时,发现报错: 是说找不到主机名为namenode的主机,那么应该是配置文件出错了. 经过检查,发现是spark-defaults.conf文件配置错误,配置的时候直接将上面复制了下来,导致忘了修改为node1,所以配置时一定要细心 更改后完美解决 最近老是犯低级错误,难受‍…