Conda needs to be updated
However, you cannot update in the virtual environment, otherwise the following error will occur:
Exit the virtual environment: Source deactivate
Update in the base environment: conda updata conda
Build project, the following error appears
ERROR in js/xxxxxx.js from UglifyJs
Unexpected token: [xxxx.js], expected: punc
It was found that uglifyjs could not resolve the problem of ES6
Solutions:
Upgrade uglifyjs version and modify package.json
"uglifyjs-webpack-plugin": "^1.0.0-beta.3",
Prod.conf.js
var UglifyJSPlugin = require('uglifyjs-webpack-plugin')
# Modify the plugin in plugins
new UglifyJSPlugin({
uglifyOptions: {
compress: {
drop_debugger: true, // Note debugger
drop_console: true, // Note console
pure_funcs:['console.log'] // remove console
},
},
sourceMap: false, // Removing the .map file generated after packaging
parallel: true,
}),
Runnpm run build, Done!
When this problem occurs, there is no output from the console, and the process exits Process finished with exit code 1
Use try catch to catch the exception and find that there is still no log
public static void main( String [] args) {
try {
SpringApplication.run(ApiBdszApplication. class , args);
} catch ( Exception e){
e.printStackTrace();
}
}
But as a Java programmer with countless pits, we know that Exception is not the top exception class, so we replaced it with Throwable
public static void main( String [] args) {
try {
SpringApplication.run(ApiBdszApplication. class , args);
} catch ( Throwable e){
e.printStackTrace();
}
}
At this time, except for the error content in the log printing, follow the log prompts to solveDuring the search for this problem, I read many online solutions, and finally came up with three solutions:
1. Use the above capture method
2. Check whether the springboot version and springcloud version match
3. Check whether you have written some configuration files wrong.
Today, a colleague encountered a problem when installing our system to a customer.
Background: colleagues installed as follows:
The server is a small machine, a virtual machine made on the small machine. WIN2003 operating system is installed with 64 bits.
Database: oracle11g.
PLSQL7.5
On a 64-bit machine, the following error is reported when PLSQL is accessed:
Initialization error
SQL*Net not properly installed
OracleHomeKey:
OracleHomeDir:
I searched on the Internet and found that it is a 64-bit machine, and a 32-bit Oracl client needs to be installed for PLSQL to access it correctly.
After installing the Oracl client, this problem was solved.
Then came another problem: when logging in with PLSQL, an error ORA-12154: TNS: Unable to process the service name was reported . I changed the listener.ora and tnsname.ora under D:\Oracle\product\11.2.0\dbhome_1\NETWORK\ADMIN, but it still doesn’t work. After various attempts, the error persisted.
I have no choice but to install an Oracl client and PLSQL7.5 on another LAN machine. When installing PLSQL7.5, the default path is c:\program files (x86)\PLSQLDeveloper, but an error will be reported, roughly Saying that NET might have a problem, I changed the path to D:\tool\PLSQLDeveloper. After configuring tnsname.ora of an Oracl client, run PLSQL again, and it is normal and connected.
Go back, check the PLSQL on the server, the installation path is the default path c:\program files (x86)\PLSQLDeveloper, uninstall and reinstall. The installation path has been changed. After finishing, run PLSQL again, it is normal. Haha
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor is reported when java connects to oracle database
Wrong url:
jdbc:oracle:thin:@xxx.xxx.xxx.xxx:1521:orcl
Correct writing:
jdbc:oracle:thin:@xxx.xxx.xxx.xxx:1521/orcl
As shown in the figure:
Tried: pip install mysql-connector-python==2.0.1 The error remains
Solution:
wget https://cdn.mysql.com/Downloads/Connector-Python/mysql-connector-python-2.0.3.zip
unzip mysql-connector-python-2.0.3.zip
cd mysql-connector-python-2.0.3
python setup.py install
Reference: stackoverflow
pip install lxmlFailure under mac :
xcode-select --installSTATIC_DEPS=true sudo pip install lxmlThis error is because: after the finish()function, it was called redict. It will be a mistake.
Solution:
Yes, by if self._finished:judging whether the finish()function has been called.
An idiot mistake, the error prompt: Error: cannot get XMLSec1 pre-processor and compiler flags; do you have the libxmlsec1development package installed?
But I didn’t know that it libxmlsec1was a system library, it should be installed with brew, and I also installed it with pip. . . . .
Solution
brew install libxmlsec1
It is possible that the version of the pillow package is incorrect. Installing the latest one can solve the problem.
# install libjpeg-dev with apt
sudo apt-get install libjpeg-dev
# if you're on Ubuntu 14.04, also install this
sudo apt-get install libjpeg8-dev
# reinstall pillow
pip install --no-cache-dir -I pillowUse the requests library to request url, this error will occur, the reason is:
The server is overloaded, and no more links can be established. There are 4 possibilities:
Solution:
1. increase the number of retry connections
requests.adapters.DEFAULT_RETRIES = 5
2. close redundant connections
requests uses the urllib3 library, the default http connection is keep-alive, requests set False to close.
Operation method:
s = requests.session()
s.keep_alive = False