Why Does My Go Project Show 'Package XXX is not in GOROOT'?

"Package XXX is not in GOROOT" when Building a Go Project

Debugging the error "package project/game is not in GOROOT" requires understanding the concept of Go modules and project layout.

Go Modules and Project Structure:

In newer versions of Go (post 1.13), Go modules are used to manage package dependencies. A Go module is typically a directory containing a go.mod file and source code. The go.mod file declares the module's name, its dependencies, and where it is located in the filesystem.

Resolving the Issue:

1. Have a go.mod file at the project root:
   Ensure that the project root directory contains a go.mod file. This file must be located inside the repository and declare the project's module name.
2. GOROOT and GOPATH are Not Required:
   In newer versions of Go, environment variables like GOROOT and GOPATH are no longer necessary. Package dependencies are managed through go.mod.

3. Examine Build Command:
   Verify the command that Goland is using to build the project. It should be similar to:

   go build -o C:UsersusernameAppDataLocalTemp___go_build_project_server.exe project/server

   This command should not specify the GOROOT flag.

4. Assuming Incorrect Package Location:
   The error message suggests that the project expects the project/game package to be in GOROOT. However, this package should be located in the project's source tree.
5. Check Package Path:
   Ensure that the package path in the source code (e.g., "project/game") matches the path used in the build command.

Workflow with Nested Packages:

If your project has nested packages, such as "project/game/entity," you should follow these additional steps:

1. Create go.mod files for subdirectories:
   Create a go.mod file inside each subdirectory that contains its own package. This file should declare the submodule's name and dependency on the parent module.

2. Import Packages in Subdirectories:
   In the subdirectory's source code, import the package from the parent module using the syntax:

   import "parent/submodule"

By following these steps, you can resolve the "package project/game is not in GOROOT" error and correctly build your Go project with nested packages.

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