What should I do if golang cannot start the project?

For learners who use Golang to program, it is very common to be unable to start the project. Whether in the beginner stage or in daily work, we may encounter this problem. Next, we will discuss some reasons and solutions that may cause Golang to fail to start the project.

The first situation: environment variable setting error

When using Golang for programming, we need to add the path of Golang installation to the PATH environment variable. If the environment variables are not set correctly, we will encounter problems when starting the project. For example, under the Windows operating system, open the cmd window and enter the command:

go version

If the prompt "No command 'go' found..." appears, it means that the installation path of Golang has not been correctly added to the PATH environment. in variables.

The solution is as follows:

1. Open the "Computer" (or "My Computer") window, right-click the mouse and select "Properties";
2. In Select "Advanced System Settings" in the left panel;
3. Select "Environment Variables" in the pop-up window;
4. Select PATH in the system variables and click Edit (or double-click);
5. Add the installation path of Golang in the editing window, for example:

C:\go\bin

6. Click "OK" to save the settings, and finally open a new cmd window and re-enter "go version" command. If no error message appears, the setting is successful.

The second situation: the port is occupied

When starting the Golang project, if the port is occupied, the project will not be started. For example, we run the following command on the command line:

go run main.go

If the prompt "listen tcp :8080: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted." appears. , indicating that port 8080 is occupied.

The solution is as follows:

1. To find the process occupying the port, you can use the following command:

netstat -ano | findstr :<port></port>

Among them, <port> </port> is the port number, such as 8080. After executing this command, the process IDs occupying the port will be listed.

2. End the process occupying this port. You can use the following command:

taskkill /pid <pid> /f</pid>

Where, <pid></pid> is the process ID that occupies the port. After executing this command, the process will stop.

3. Restart the Golang project. Re-execute the command:

go run main.go

If there is no problem, you can start the project normally.

The third situation: missing dependency packages

When writing a Golang project, we may use some external dependency packages. If a message indicating missing dependent packages appears when starting the project, then we need to install these dependent packages.

For example, when we import the third-party package gin, if we encounter the following prompt:

main.go:3:2: cannot find package "github.com/gin-gonic/gin" in any of:
    C:\go\src\github.com\gin-gonic\gin (from $GOROOT)
    C:\Users\UserName\go\src\github.com\gin-gonic\gin (from $GOPATH)

At this time, we need to open a command line window or terminal and execute the following command:

go get -u github.com/gin-gonic/gin

This will download and install the required dependency packages. Then run the Golang project again to start normally.

Summary:

The above are the main reasons and solutions for the inability to start the project when programming in Golang. No matter what kind of problem you encounter, the most important thing is to patiently find the root cause of the problem, read more information, and learn more different solutions, so that you can improve your programming skills!

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