route

[ganganlee]

product.GET("/:id",controller.GetProductById)
product.GET("/order/:id",controller.GetOrderWhitProduct)

When the two routes exist ,go build error

[DGKSK8LIFE]

product.GET("/:id",controller.GetProductById)
product.GET("/order/:id",controller.GetOrderWhitProduct)

When the two routes exist ,go build error

What's the build error that you get?
Have you considered the fact that you don't have a space in both controller.... after the commas?
Also, Are you sure that your method calls aren't incorrectly named (not the GIN ones, but the methods of controller)?

[DGKSK8LIFE]

It's probably either what I listed above, or that you just have two url ARGS with the same names.

[vishnukvmd]

Looks like it's a known limitation: #1681
You should instead try

product.GET("/:id",controller.GetProductById)
product.GET("/:id/order",controller.GetOrderWhitProduct)

[appleboy]

Please move to #1681 to discuss.