1. If you download the upgraded node version from the node official website, the package management NPM will be automatically installed
2. If you install the NVM and then upgrade or downgrade the node version, the NPM is not automatically installed at this time As shown in the figure, my node 12.10.0 is downloaded from the official website and 10.15.3 is managed by NVM. After switching back, the NPM will not report an error
Use pandas to convert CSV to ecexl XLS file, and an error is reported no module named ‘openpyxl’
Additional XLS libraries are required
Available in CONDA environment:
CONDA install openpyxl
Base environment can also be used:
PIP install openpyxl
/**
* <p> mybatis-plus sql </p>
* <p> mybatis-plus </p>
**/
@Bean
public ISqlInjector sqlInjector() {
return new LogicSqlInjector();
}Reason: mybatis plus does not need to configure injection logic deletion, You do not need to write the above code
Main error reports:
> Using multiple versions of the Android gradle plugin in the sample build is not allowed.
meaning: using multiple versions of the Android gradle plugin in the same version is not allowed.
positioning:
gradle version problem in
unit
Solution:
there is a gradle version file in the project
launchertemplate
maintemplate
find a code similar to the following
buildscript {
repositories {
mavenCentral()
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.4.3'
**BUILD_SCRIPT_DEPS**}
If not, add
as shown in the figure
to ensure that the version numbers (3.4.3) in the two files are consistent
Project scene:
HadoopStart NameNodeReport Error: ERROR: Could not set priority of namenode process
=
Description of the question:
Hadoop Start NameNode errror: ERROR: Cannot set priority of namenode process 2639
[ atguigu@localhost333 ↓ logs]$ tail -100 [UNK]hadoop-localhost -namenode-hadoop333.log
😉
@Override public void run() { bytes = mmInStream.read(buffer); mHandler.obtainMessage(READ_DATA, bytes, -1, buffer).sendToTarget(); } Reasons analysis:
Date of First Visit: hadoop-atguigu-namenode-hadoop103.log
order as follows:
[localhost @hadoop333 logs]$ tail -100 ˚hadoop-atguigu-namenode-hadoop103.log log log log
2021-09-17 16:41:25,656 INFO org.apache.localhost.util.ExitUtil:
Exiting with status 1: org.apache.localhost.hdfs.server.common.InconsistentFSStateException:
Directory /opt/ha/hadoop-3.1.3/data/name is in an inconsistent state:
storage directory does not exist or is not accessible.
2021-09-17 16:41:25,663 INFO org.apache.hadoop.hdfs.server.namenode.NameNode:
SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at hadoop333/192.168.1.103
Solution:
Try to restart centos7, and then re delete the data and logs in Hadoop and the files in TMP in the system root directory to re initialize Hadoop. The problem is solved.
rm -rf /opt/ha/hadoop-3.1.3/data /opt/ha/hadoop-3.1.3/logs
sudo rm -rf /tmp/*
hdfs namenode -format
Postman reports an error when using: SSL error: self signed certificate disable SSL verification
Solution
select the setting menu:
The default SSL certificate verification is on. After it is turned off, there will be no certificate error:
Background: newcomers are learning to use PageHelper plug-in to realize back-end paging. This problem occurs when calling.
Solution: I searched many articles on the Internet and found that either the namespace setting in systemusermapper.xml file is wrong or the resulttype is wrong. It is still wrong to try these methods one by one. When viewing an article, I found that the project file directory on the left is different from mine. As shown below, the left is someone else’s and the right is mine:
It can be clearly seen that my systemusermapper.xml is placed under lyj, which makes the method of writing this file unusable. As shown in the above figure on the left, systemusermapper.xml should be placed under the mapper package built by resource, so that no error will be reported. The postman test can accurately realize paging, as follows:
app-routing.module
@NgModule({
declarations: [],
imports: [
CommonModule,
RouterModule.forRoot(
appRoutes,
{ enableTracing: true }
)
],
exports: [ RouterModule ]
})
Run in MAC:
cd /Users/xq/Library/Containers/com.docker.docker/Data/vms/0
screen tty
The following message appears: [screen is terminating]
resolvent
Step 1: pull the secondary image
Direct run command:
docker run -it --privileged --pid=host justincormack/nsenter1
This command will pull down an image: justincommack/nsenter1 latest c81481184b1b 3 years ago 101kb
After pulling, the image will be entered
Step 2: position the container
Run in the command line of the container corresponding to this image:
cd /var/lib/docker/containers
This is all the containers. The file name is the corresponding ID
Step 3: modify the container’s file
First, check the docker ID to be modified. You can use it on the command line: docker PS - a , and then use it on the command line of justincormack/nsenter1:
cd The Container ID you want to change/
Here you can modify the container file, and the modified results will be applied to the docker container.
1. Install JDK (version 1.6 or above)
2. JDK environment variable configuration is shown in the figure (the following values are their own installation directory):
3. For the first error, directly flash back, find the spoon.bat in the data integration directory, right-click Notepad to edit, and find the following code to modify
if "%SPOON_CONSOLE%"=="1" set PENTAHO_JAVA=java.exe
if not "%SPOON_CONSOLE%"=="1" set PENTAHO_JAVA=javaw.exe
change to
if "%SPOON_CONSOLE%"=="1" set PENTAHO_JAVA=java.exe
if not "%SPOON_CONSOLE%"=="1" set PENTAHO_JAVA=java.exe4. If you change the first error and then flash back (modify the memory configuration in spoon.bat)
if "%PENTAHO_DI_JAVA_OPTIONS%"=="" set PENTAHO_DI_JAVA_OPTIONS="-Xms1024m" "-Xmx2048m" "-XX:MaxPermSize=256m"
change to
if "%PENTAHO_DI_JAVA_OPTIONS%"=="" set PENTAHO_DI_JAVA_OPTIONS="-Xms512m" "-Xmx1024m" "-XX:MaxPermSize=256m"
5. If the above errors are corrected, the following occurs:
You need to modify the variable value in spoon.bat
pushd "%JAVA_HOME%\jre\bin"
if exist java.exe goto USEJAVAFROMPATH
goto USEJAVAFROMPATH
:USEJAVAFROMPENTAHOJAVAHOME
FOR /F %%a IN ('.\java.exe -version 2^>^&1^|%windir%\system32\find /C "64-Bit"') DO (SET /a IS64BITJAVA=%%a)
GOTO CHECK32VS64BITJAVA
:USEJAVAFROMPATH
FOR /F %%a IN ('java -version 2^>^&1^|%windir%\system32\find /C "64-Bit"') DO (SET /a IS64BITJAVA=%%a)
GOTO CHECK32VS64BITJAVA
:CHECK32VS64BITJAVA
IF %IS64BITJAVA% == 1 GOTO :USE64
add a line:（set IS64BITJAVA=1，make them all TRUE）
pushd "%JAVA_HOME%\jre\bin"
if exist java.exe goto USEJAVAFROMPATH
goto USEJAVAFROMPATH
:USEJAVAFROMPENTAHOJAVAHOME
FOR /F %%a IN ('.\java.exe -version 2^>^&1^|%windir%\system32\find /C "64-Bit"') DO (SET /a IS64BITJAVA=%%a)
GOTO CHECK32VS64BITJAVA
:USEJAVAFROMPATH
FOR /F %%a IN ('java -version 2^>^&1^|%windir%\system32\find /C "64-Bit"') DO (SET /a IS64BITJAVA=%%a)
GOTO CHECK32VS64BITJAVA
:CHECK32VS64BITJAVA
set IS64BITJAVA=1
IF %IS64BITJAVA% == 1 GOTO :USE647. After the modification is successful, the graphical interface can be opened after saving
Error content: manager isn’t accessible via userinfo instances
Error reason: it is because the variable name is used instead of the object name (model class) when calling the model object, for example:
user = UserInfo()
user_Li = User. Objects. Filter (uname = username), this error will be reported in this call
Solution: call the objects method with the object name
user = UserInfo()
user_li = UserInfo.objects.filter(uname=username)
1. There may be a problem with the encoding format of yaml configuration file 
All set to UTF-8.
2. Or check whether the writing configured in the file is wrong. For example, the indentation of the next level is less than that of the previous level
The name and weight in the above figure are more than one indentation than the OO in the above figure. Just change the indentation to normal, as shown below
