Category Archives: How to Fix

Idea has installed markdown, open it or will not show preview effect

Idea has Markdown installed and will not show the preview effect
why
This is because the.md file at the end of the Markdown plugin was opened using Text, so idea is now opened using Text.
The solution
In the file - & gt; The Settings - & gt; The Editor - & gt; File Types under Recongnized the File Types found under Markdown , then click on the Registered Patterns bar to the right of the plus sign, fill in the * md save. The .mdle has been registered in Text.


		
		
			This entry was posted in How to Fix and tagged Tool use on 2021-03-01 by Robins.



	
				
			
						
				Square root of X (implementation of binary search)
			
								


				
			
Square root of x (binary search implementation)
class Solution {
    public int mySqrt(int x) {
        int l = 0, r = x, ans = -1;
        while (l <= r) {
            int mid = (l + r)/ 2;
            if ((long) mid * mid <= x) {
                ans = mid;
                l = mid + 1;
            } else {
                r = mid - 1;
            }
        }
        return ans;
    }
}


					

		
		
			This entry was posted in How to Fix and tagged IT famous enterprise algorithm and database topic, The sword refers to offer on 2021-03-01 by Robins.								

	


	
				
			
						
				Add a new springboot, and it will appear unable to read meta data for class when it is dependent
			
								


				
			
 
br> 
 <> 
					

		
		
			This entry was posted in How to Fix and tagged jar, Job log, maven, spring boot on 2021-03-01 by Robins.								

	


	
				
			
						
				Depending on the custom component jar package, unable to read meta data for class appears after startup
			
								


				
			
  
 
java.lang.IllegalStateException: Unable to read meta-data for class com.dyt.controller.TestController1
	at org.springframework.boot.autoconfigure.AutoConfigurationSorter$AutoConfigurationClass.getAnnotationMetadata(AutoConfigurationSorter.java:233) ~[spring-boot-autoconfigure-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at org.springframework.boot.autoconfigure.AutoConfigurationSorter$AutoConfigurationClass.getOrder(AutoConfigurationSorter.java:204) ~[spring-boot-autoconfigure-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at org.springframework.boot.autoconfigure.AutoConfigurationSorter$AutoConfigurationClass.access$000(AutoConfigurationSorter.java:150) ~[spring-boot-autoconfigure-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at org.springframework.boot.autoconfigure.AutoConfigurationSorter.lambda$getInPriorityOrder$0(AutoConfigurationSorter.java:62) ~[spring-boot-autoconfigure-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at java.util.TimSort.countRunAndMakeAscending(Unknown Source) ~[na:1.8.0_201]
	at java.util.TimSort.sort(Unknown Source) ~[na:1.8.0_201]
	at java.util.Arrays.sort(Unknown Source) ~[na:1.8.0_201]
	at java.util.ArrayList.sort(Unknown Source) ~[na:1.8.0_201]
	at org.springframework.boot.autoconfigure.AutoConfigurationSorter.getInPriorityOrder(AutoConfigurationSorter.java:61) ~[spring-boot-autoconfigure-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector$AutoConfigurationGroup.sortAutoConfigurations(AutoConfigurationImportSelector.java:430) ~[spring-boot-autoconfigure-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector$AutoConfigurationGroup.selectImports(AutoConfigurationImportSelector.java:415) ~[spring-boot-autoconfigure-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGrouping.getImports(ConfigurationClassParser.java:872) ~[spring-context-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGroupingHandler.processGroupImports(ConfigurationClassParser.java:798) ~[spring-context-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorHandler.process(ConfigurationClassParser.java:770) ~[spring-context-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:185) ~[spring-context-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:315) ~[spring-context-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:232) ~[spring-context-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275) ~[spring-context-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95) ~[spring-context-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:705) ~[spring-context-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:531) ~[spring-context-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744) [spring-boot-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391) [spring-boot-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) [spring-boot-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204) [spring-boot-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at com.dyt.MybatisApplication.main(MybatisApplication.java:12) [classes/:na]
Caused by: java.io.FileNotFoundException: class path resource [com/dyt/controller/TestController1.class] cannot be opened because it does not exist
	at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:180) ~[spring-core-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:51) ~[spring-core-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:103) ~[spring-core-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.boot.type.classreading.ConcurrentReferenceCachingMetadataReaderFactory.createMetadataReader(ConcurrentReferenceCachingMetadataReaderFactory.java:86) ~[spring-boot-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at org.springframework.boot.type.classreading.ConcurrentReferenceCachingMetadataReaderFactory.getMetadataReader(ConcurrentReferenceCachingMetadataReaderFactory.java:73) ~[spring-boot-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:81) ~[spring-core-5.1.14.RELEASE.jar:5.1.14.RELEASE]
	at org.springframework.boot.autoconfigure.AutoConfigurationSorter$AutoConfigurationClass.getAnnotationMetadata(AutoConfigurationSorter.java:229) ~[spring-boot-autoconfigure-2.1.13.RELEASE.jar:2.1.13.RELEASE]
	... 27 common frames omitted


/ meta-inf /spring.factories 
 
br br br /classes
 
 
 
 
 
					

		
		
			This entry was posted in How to Fix and tagged Bug to solve, maven, plugin, spring boot on 2021-03-01 by Robins.								

	


	
				
			
						
				Unable to read meta data for class
			
								


				
			
From: http://www.infoq.live/links, original author: Chen, wei
 problem description 

 Unable to read meta-data for class 
 Unable to read meta-data for class 
 Unable to read meta-data for class 
 Unable to read meta-data for class

Locate  
 analysis custom starter in spring. The factories configure multiple configuration, need each other to interval \ 
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
cn.xxx.xxx.secret.SecretAutoConfiguration,
cn.xxx.xxx.secret.modules.cors.WebMvcConfiguration

Correct configuration:
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
cn.xxx.xxx.secret.SecretAutoConfiguration,\
cn.xxx.xxx.secret.modules.cors.WebMvcConfiguration


					

		
		
			This entry was posted in How to Fix and tagged java, spring boot on 2021-03-01 by Robins.								

	


	
				
			
						
				Unicode decodeerror: ‘UTF-8’ codec can’t decode byte 0xd3 in position 238: invalid continuation B
			
								


				
			
UnicodeDecodeError: ‘UTF-8’ codec can’t decode byte 0xD3 in position 238: invalid continuation B

 

directory

To solve the problem

solution

The solution

 

 

 

To solve the problem

UnicodeDecodeError: ‘utf-8’ codec can’t decode byte 0xd3 in position 238: invalid continuation byte

 

 

solution

Unicode decoding error: “UTF-8” codec cannot decode byte 0xD3 in position 238: Continue byte invalid

 

 

The solution

Open the file in Python’s IDE, and add a line of code at the top!

# -*- coding: utf-8 -*-

or

# coding: utf8

 

 

 

 

					

		
		
			This entry was posted in How to Fix and tagged Computer Knowledge, Installation tutorials and Bug fixes on 2021-03-01 by Robins.								

	


	
				
			
						
				Jedis operation redis report noauth authentication required
			
								


				
			
Because the password was wrong, I simply deleted the password from my configuration file and restarted Redis. 
  = 
					

		
		
			This entry was posted in How to Fix and tagged Java back-end, redis on 2021-03-01 by Robins.								

	


	
				
			
						
				Mybatis exception error setting driver on unpoleddatasource. Cause: java.lang.ClassNotFoundException :
			
								


				
			
Connector jar has been imported, or a Cause: Java, SQL. SQLException: Error setting driver on UnpooledDataSource. Cause: Java. Lang. ClassNotFoundException: always find a class: com. Mysql.. JDBC driver



When you open the properties file, you find an extra space (underlined in red), so make sure you don’t enter extra Spaces when writing the properties file.



					

		
		
			This entry was posted in How to Fix and tagged mybatis on 2021-03-01 by Robins.								

	


	
				
			
						
				Mybatis database error java.sql.SQLException : Error setting driver on UnpooledDataSource. Caus
			
								


				
			
### Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: ${jdbc.driver}


 = 
					

		
		
			This entry was posted in How to Fix and tagged An error collection, mybatis, Mybatis error on 2021-03-01 by Robins.								

	


	
				
			
						
				Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNot
			
								


				
			
This error is usually caused by the failure to load the MySQL driver successfully. I have checked that there is a MySQLjar in Maven. So what’s the problem?
<property name="driver" value="com.mysql.jdbc.Driver"/>
The problem is in this code, you can’t use the wrong case. driver—> Driver

					

		
		
			This entry was posted in How to Fix and tagged java on 2021-03-01 by Robins.								

	


	
				
			
						
				Unable to read scheme document‘ http://www.springframework.org/schema/spring-context.xsd The solution to the problem
			
								


				
			
Plan document spelling error, go to the official website click the link URL to copy to Eclipse, sometimes only a space may lead to error, and the naked eye is not easy to find.

					

		
		
			This entry was posted in How to Fix and tagged java, spring on 2021-03-01 by Robins.								

	


	
				
			
						
				Remove spaces after characters in Excel cells
			
								


				
			
 Code value (obtained by the CODE function) In the range 1-255, there are 148 invisible characters 1-15,28-32,127-254. Clean (A1) can be used to remove characters with code value less than or equal to 31 (including visible characters 16-27) and characters with code value equal to 128. Substitute (A1,CHAR(32),””) function can remove invisible characters whose code value is equal to 32 and 129-254, and TRIM function can remove such characters at both ends of the string. Invisible characters with code value equal to 127 can only be removed using the SUBSTITUTE(A1,CHAR(127),””) function. Using both functions together, you can basically remove all invisible characters with code values less than 255 (including visible characters with code values 16-27):
 SUBSTITUTE(SUBSTITUTE(CLEAN(A1),CHAR(32),””),CHAR(127),””) 

					

		
		
			This entry was posted in How to Fix and tagged excel on 2021-03-01 by Robins.								

	

			
				Post navigation
				← Older posts
				Newer posts →