Today, when I was working on the student information management system, I just ran tomcat and opened the web page and clicked on the student table.
program could not go when I went to the Servlet. I checked the content of the Servlet and found that there was no mistake, and there was no problem after I looked at the interface implementation of Dao layer.
Finally, I thought about it and found that My Mysql was turned off when I ran PHPstudy yesterday. Then I opened the service and found that my Mysql was in a stopped state. 
here because yesterday when using PHPStudy, because the integrated environment in PHPStudy contains Mysql, when Mysql on our computer is turned on, Mysql in PHPStudy cannot run. So I shut down Mysql on my computer.
So if we right click on Mysql, we can start, and Mysql is up and running, and our project is running successfully.
ionic4- error TS2307: Cannot find module ‘rxjs-compat/Observable’
The article directories
Sets the interceptor error location
Set interceptor
Without further ado, While writing the interceptor file on the project, Sal had a problem with the introduction:
The Error in node_modules/RXJS observables. Which s (1, 2) : Error TS2307: always find module ‘RXJS – compat/Obserable’
An error location
is not clear about the difference between RXJS and ionicjs after ionic3 has been raised to ionic4, so after multi-party search, we found two relatively certain solutions:
The
- first
import 'rxjs-compat'
To:
import 'rxjs/Rx'
2. Use command statements
npm install rxjs@6 rxjs-compat@6 --save
Upgrading RXJS V5.x to 6 will solve the problem.
Solutions to the problem of “collect2.exe: error: LD returned 1” exit “status when writing C + + with vscode
VSCode writes C++ code, and an error is reported at runtime:
Undefined reference to ` WinMain ‘
Exe: Error: LD returned 1 exit status
Solution 1:
Check the code to see if there are any keyword misspellings.
Solution 2:
Close the collect2. Exe.
Win+R, Enter MSinfo32, Enter;
Software environment –& GT; Running tasks;
Find the corresponding process and view the “process ID”;
Win+R, Enter CMD, Enter;
Input: TSkill process ID.
Solution 3:
Ctrl+S, save. To run again.
Undefined reference to ` WinMain ‘
Exe: Error: LD returned 1 exit status
Solution 1:
Check the code to see if there are any keyword misspellings.
Solution 2:
Close the collect2. Exe.
Win+R, Enter MSinfo32, Enter;
Software environment –& GT; Running tasks;
Find the corresponding process and view the “process ID”;
Win+R, Enter CMD, Enter;
Input: TSkill process ID.
Solution 3:
Ctrl+S, save. To run again.
Error 2005 (HY000) unkonw MySQL server host…
ERROR ERROR when mysql import backup data 2005(HY000) Unkonw mysql Server Host…
ERROR ERROR 1204(HY000) Unkonw mysql Server host…
ERROR ERROR 1204(HY000) Unkonw mysql Server host…
use mysqldump command to backup the database to an external file, but when using mysql command line to import the backup data, ERROR 2005(HY000) unkonw mysql server host… error
Solutions:
because in peacetime work often use mysqldump command to export the backup data, and then use the mysql client source command in the command line tools to import data, never out of the fault, the only difference is the character set is different, this time to import the database character set is utf8, so they are associated with the need for mysql client command line tools specified character set, after reviewed the help, Open mysql client tool mysql-uroot-p – default-character-Set = UTf8 with the following command, then import the backup data, and everything is OK.
ASP.NET Parser Error Message: Could not load type ‘Web.Global’.
Server Error in ‘/myapp’ Application.
Parser Error
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.
Parser Error Message: Could not load type ‘Web.Global’.
Source Error:
Line 1: <%@ Application Codebehind="Global.asax.cs" Inherits="Web.Global" Language="C#" %> |
The Source File:/ierp2/global asax
The Line: 1.
Version Information: Microsoft.net Framework Version:4.0.30319; ASP.NET Version: 4.0.30319.1
The Web project referred to other class projects. When I opened Bin, it was empty. I just remembered that I had implemented the cleaning solution when I did the backup before, but I did not regenerate it this time.
Typical error log for IPSec ACL mismatch
IPSec ACL is what we usually call VPN traffic of interest. In real life, problems caused by this ACL configuration error are very common. The typical error is “QM FSM error”, which can be checked by running “Debug Crypto isakmp” on PIX/ASA.
May 15 09:17:11 [IKEv1]: Group = X.X.X.X, IP = X.X.X.X,
QM FSM error (P2 struct & 0x41f7f80, mess id 0x4d3d6016)!
May 15 09:17:11 [IKEv1]: Group = X.X.X.X, IP = X.X.X.X, construct_ipsec_delete(): No SPI to identify Phase 2 SA!
May 15 09:17:11 [IKEv1]: Group = X.X.X.X, IP = X.X.X.X, Removing peer from correlator table failed, no match!
Cisco’s website explains the error log:
QM FSM Error
The IPsec L2L VPN tunnel does not come up on The PIX Firewall or ASA, and The QM FSM error message proves ambiguous. One possible reason is The proxy identities, such as interesting traffic, Access Control List (ACL) or crypto ACL, do not match on both the ends. Check the configuration on both the devices, and make sure that the crypto ACLs match.
This article explains the whole process of IKE and IPsec in detail:
http://jackiechen.blog.51cto.com/196075/158222
This article from “facing the sea, spring flowers” blog, declined to reprint!
SQL Server 2005, unable to log in, forget sa password, 15405 error!
can not be connected to./SQLEXPRESS.
Additional information:
user ‘sa’ login failed. This user is not associated with a trusted SQL Server connection. (18452), Microsoft SQL Server Error:)
— — — — — — — — — — — — — — — — — —
it’s mapping times wrong:
failed to create for user “sa”. (Microsoft) is essentially) express. The smo)
Additional information:
perform Transact_SQL statements or abnormal happened when the batch. (Microsoft) is essentially) express. ConnectionInfo)
unable to use special groups’ sa ‘. The (15405), Microsoft SQL Server Error:
2, the concrete solving steps:
the first step: open the SQL2005 with administrator login first, then right-click the selected attributes in the service name & gt; Security & gt; The login mode option on the right has been changed to authentication OK!
step 2: select safety (expand)> Login name & gt; Double-click the sa> Password change the password you need to confirm! Then turn off SQL2005 or disconnect.
. Step 3: start > Application & gt; Choose SQL2005 & gt; Configuration tool & GT; Open the configuration manager> Expand SQL Server2005 network configuration
note: select MSSQLSERVER if SQMEXPRESS
> TCP/IP options & gt; Enable and right click > Property & gt; Ip address TAB & GT; Change all disabled options to enabled & GT; Then restart the SQL2005 service!
com.apple.installer . pagecontroller error – 1 PKG installation error
Downloaded a PKG installation file on the Internet;
An error occured on a dozen installations on a MAC
The reason is that the file is directly downloaded from the Internet, there will be permission problems, need to repair the installation permission of the installation software;
My reason is, downloaded is a RAR MAC decompression can not, online decompression, got PKG installation error
I finally downloaded a MAC under the RAR decompression software
http://www.pc6.com/softview/SoftView_53196.html
Reference: https://discussions.apple.com/thread/2628710
Microsoft.CppCommon.targets (132,5): how to solve error msb3073?
Originally, I wanted to generate DLL file and copy it to the specified path automatically, but the result of compilation was error:
1> syAve.vcxproj -> D:\My Resources\Hello World\ test \Smer 2019.4.28\Debug\ syave. DLL
1> The system could not find the specified file.
1> The system could not find the specified file.
1> C: \ Program Files \ MSBuild \ Microsoft (x86) Cpp \ v4.0 \ V120 \ Microsoft CppCommon. The targets (132, 5) : error MSB3073: command “copy D: \ My Resources \ Hello World \ test \ Smer 2019.4.28 \ Debug \ syAve lib).
\Smer\Lib\Debug
1> C: \ Program Files \ MSBuild \ Microsoft (x86) Cpp \ v4.0 \ V120 \ Microsoft CppCommon. The targets (132, 5) : error MSB3073: copy D: \ My Resources \ Hello World \ test \ Smer 2019.4.28 \ Debug \ syAve DLL.. \Smer
\Lib\Debug
1> C: \ Program Files \ MSBuild \ Microsoft (x86) Cpp \ v4.0 \ V120 \ Microsoft CppCommon. The targets (132, 5) : error MSB3073:
1 & gt; C: \ Program Files \ MSBuild \ Microsoft (x86) Cpp \ v4.0 \ V120 \ Microsoft CppCommon. The targets (132, 5) : error MSB3073: : VCEnd “have withdrawn, the code is 1.
The reason: the copy command does not support paths with Spaces. (Note: Chinese is supported.)
The solution: Paths in quotes!
spring boot Whitelabel Error Page
Appears when spring Boot is running
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Sat Feb 16 00:12:17 CST 2019
There was an unexpected error (type=Not Found, status=404).
No message available
Here’s my solution
The Application startup class is not in the right place. To place the Application class on the outermost side, it contains all subpackages
reason :spring-boot automatically loads all components under the package where the startup class is located and under its subpackages.
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Sat Feb 16 00:12:17 CST 2019
There was an unexpected error (type=Not Found, status=404).
No message available
Here’s my solution
The Application startup class is not in the right place. To place the Application class on the outermost side, it contains all subpackages
reason :spring-boot automatically loads all components under the package where the startup class is located and under its subpackages.
FRP installation error:. / FRPC: cannot execute binary file: exec format error
Some students may make the following mistakes when using FRP:
./frpc: cannot execute binary file: Exec format error
The error is due to a mismatch between the system architecture of the DOWNLOADED FRP and the system architecture of the installed environment. At this time, you just need to download and install the FRP of the corresponding system architecture for installation.
system architecture can be seen in this blog:
how to view the architecture of Linux system
take a look at the architecture of Linux supported by FRP:
| 386 | X86 architecture |
|---|---|
| 386 | X86 architecture |
| amd64 | amd architecture |
| arm | arm architecture |
| arm64 | 64 – bit arm Compose |
| MIPS | MIPS architecture |
| mips64 | 64 MIPS architecture |
| mipsle | mipsle architecture |
| mips64le | 64 mipsle architecture
exception is java.lang.LinkageError: loader constraint violation: loader
Service startup reported this error:
key line error: |