RuntimeError: cudnn RNN backward can only be called in training mode
1 ‘. Train()’ is not used. Some operations are prohibited when ‘. Eval()’
2. Add one line of the following code to the error reported by using LSTM
torch.backends.cudnn.enabled = False
There is such a problem when upgrading the previous project today
### Error querying database. Cause: java.lang.NullPointerException
### The error may exist in file [/Users/xxxx/IDEA-Pr/Hire/UserInformation/target/classes/mapper/EmployeeDao.xml]
### The error may involve com.app.hire.dao.EmployeeDao.selectEmployee
### The error occurred while handling results
### SQL: select e.user_id, e.name, e.age, e.sex, e.employee_desc, e.create_time, e.last_edit_time, e.phone, e.address, e.image, a.area_id, a.area_name, a.area_desc from tb_area a,tb_employee e where a.area_id=e.area_id and e.user_id=?
### Cause: java.lang.NullPointerException] with root cause
The wrong information as like as two peas in the mapper file, I ran the code that didn’t upgrade. The result is the same code. It can’t be used here. The springboot version of the previous code is 2.3.7.RELEASE. The current version is 2.2.2.RELEASE
after two hours of crazy inquiries. Finally, the problem is found
in our mapper file, if you want to perform a joint query, you will write a resultmap to put the query results. The class to be jointly queried has an attribute javatype. Set the real class of the object as shown in the figure below
but it is strange that my previous version can run without this javatype, As a result, the version has been reduced, but it can’t run. Do you have a boss to help answer the reason?Is it because the springboot version has been upgraded?
Conclusion: when writing resulmap, you’d better add javatype, otherwise there’s no place to find such errors.
Recently, when developing with QT4, there was a problem that Q could not be recognized_ DECLARE_ The error code of the metatype macro was transplanted from Qt5. I thought it was not supported by QT4. After checking later, I found that the qmetatype. H header file must be included in QT4, and only qvariant needs to be included in Qt5.
This appmon was changed to observer after erl17. So if you can’t start by calling the command appmon: start(), you can try Observer: start()
observer:start().
Solve MySQL installation error: initializing database prompts an error when installing mysql
when we install MySQL database, we report an error in initializing database because MySQL has not been completely uninstalled before. We can solve it according to the following methods:
1. First stop the original MySQL service
-Right click my computer
– select “management”
– click “service”
– find MySQL
– right click to close the service
2. Enter the control panel to uninstall mysql
in the panel, right-click Mysql to uninstall, and then follow the steps prompted to uninstall
3. Go to MySQL installation directory and delete relevant files
generally, the database is on Disk C by default. Open it in the file browser, and then check the “hidden items” to open the following three files
– Program Files
– Program Files (x64)
– ProgramData
delete the MySQL directory under these three folders
4. Clean the registry and completely delete the MySQL service
Press and hold the windows key + r on the keyboard to open the command line, enter regedit to enter the registry
and find it in turn:
HKEY_ LOCAL_ MACHINE——SYSTEM——ControlSet001——services——eventlog——Application——MySQL
right click the MYSQL to delete it. If there are still the following directories:
HKEY_ LOCAL_ MACHINE——SYSTEM——ControlSet002——services——eventlog——Application——MySQL
you can also right-click to delete. If not, it will be ignored
5. Restart the system
Problem Description:
An error occurred while deploying Tomcat
Cause analysis:
Web.xml configuration error
Solution:
Modify web.xml
Duplicate XML file
Sometimes restarting the cache does not kill the background
Method 1: Win + R input: CMD
taskkill /f /im java.exe
Kill java.exe
the background can also be killed in the task manager;
Method 2: find and delete all target files
Compilation succeeded after restart! For reference only
At first, I thought it was a memory problem. Later, I searched and said that the package is independent and is not called by anyone, so I can’t use shrink.
I add the following to the configuration file:
-dontshrinkIf it is a graphical interface, just remove the shrink check box.
When starting tomact: artifact hello2: War: error during artifact deployment.
solution: check the web.xml file and find that there is a * */* *, which can be started normally after adding it
be careful. I found this problem after looking for it all night
Caused by: org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.util.ConcurrentModificationException
### Cause: java.util.ConcurrentModificationException
at org.apache.ibatis.exceptions.ExceptionFac
For the iterative stability problem, it is used for database query. The value of lastbyparam.getid is re assigned to ID, and an error is reported due to the reference of the object; Another problem is that valueconfig is the value obtained from Nacos. The global variable cannot always add ID, and the collection will slowly grow
List<Long> Ids = valueConfig.getIds();
Ids.add(Id);
ObjectDO lastByParam = testMapper.getLastByParam(userId, Ids, null);
if (lastByParam != null){
Id = lastByParam.getId();
}
The solution is to re new a collection
Error: pool overlaps with other one on this address space is sometimes reported when creating networks in docker. This is because the target network segment already exists. Usually, this occurs when the network to be created manually specifies the subnet network segment address.
At this time, there are two options: one is to check whether the container of the existing network segment is in use. If it is no longer used, you can delete the network card corresponding to the network segment, and the other is to modify the address of the target subnet network segment.
Docker network LS
View docker network card
Docker network RM network card ID
delete docker network card
Docker network inspect network card ID
view the details of the docker network card
Modify the working directory in pycharm settings
Path:
file | settings | build, execution, deployment | console | Python console
Fill in the python installation directory in the working directory and restart the python console
