Check the error returned by template.ParseFiles.
Always check error returns.
Ian
On Thu, Mar 26, 2020 at 10:53 AM <davetweetl...@gmail.com> wrote:
>
> Hey guys,
>
> I'm pretty new to Golang and encountering a runtime error which I'm not able
> to fix.
>
> Need help guys!
>
> ********************************************************************************Error*******************************************************************************************
> 020/03/26 22:55:04 http: panic serving [::1]:41498: runtime error: invalid
> memory address or nil pointer dereference
> goroutine 6 [running]:
> net/http.(*conn).serve.func1(0xc000099040)
> /usr/local/go/src/net/http/server.go:1767 +0x139
> panic(0x7815e0, 0xabef60)
> /usr/local/go/src/runtime/panic.go:679 +0x1b2
> text/template.errRecover(0xc000054b30)
> /usr/local/go/src/text/template/exec.go:164 +0x1cb
> panic(0x7815e0, 0xabef60)
> /usr/local/go/src/runtime/panic.go:679 +0x1b2
> text/template.(*Template).execute(0x0, 0x867380, 0xc0000d20e0, 0x7a01e0,
> 0xc00000e2e0, 0x0, 0x0)
> /usr/local/go/src/text/template/exec.go:218 +0x1c1
> text/template.(*Template).Execute(...)
> /usr/local/go/src/text/template/exec.go:204
> main.Index(0x86d0c0, 0xc0000d20e0, 0xc000114000)
> /home/dave/Go_workstation/src/web_calss/main.go:22 +0x11d
> net/http.HandlerFunc.ServeHTTP(0x802840, 0x86d0c0, 0xc0000d20e0, 0xc000114000)
> /usr/local/go/src/net/http/server.go:2007 +0x44
> net/http.(*ServeMux).ServeHTTP(0xaceda0, 0x86d0c0, 0xc0000d20e0, 0xc000114000)
> /usr/local/go/src/net/http/server.go:2387 +0x1bd
> net/http.serverHandler.ServeHTTP(0xc0000d2000, 0x86d0c0, 0xc0000d20e0,
> 0xc000114000)
> /usr/local/go/src/net/http/server.go:2802 +0xa4
> net/http.(*conn).serve(0xc000099040, 0x86d980, 0xc000068380)
> /usr/local/go/src/net/http/server.go:1890 +0x875
> created by net/http.(*Server).Serve
> /usr/local/go/src/net/http/server.go:2928 +0x384
> 2020/03/26 22:55:04 http: panic serving [::1]:41500: runtime error: invalid
> memory address or nil pointer dereference
> goroutine 18 [running]:
> net/http.(*conn).serve.func1(0xc0000ee000)
> /usr/local/go/src/net/http/server.go:1767 +0x139
> panic(0x7815e0, 0xabef60)
> /usr/local/go/src/runtime/panic.go:679 +0x1b2
> text/template.errRecover(0xc000107b30)
> /usr/local/go/src/text/template/exec.go:164 +0x1cb
> panic(0x7815e0, 0xabef60)
> /usr/local/go/src/runtime/panic.go:679 +0x1b2
> text/template.(*Template).execute(0x0, 0x867380, 0xc000148000, 0x7a01e0,
> 0xc0000fc020, 0x0, 0x0)
> /usr/local/go/src/text/template/exec.go:218 +0x1c1
> text/template.(*Template).Execute(...)
> /usr/local/go/src/text/template/exec.go:204
> main.Index(0x86d0c0, 0xc000148000, 0xc000110000)
> /home/dave/Go_workstation/src/web_calss/main.go:22 +0x11d
> net/http.HandlerFunc.ServeHTTP(0x802840, 0x86d0c0, 0xc000148000, 0xc000110000)
> /usr/local/go/src/net/http/server.go:2007 +0x44
> net/http.(*ServeMux).ServeHTTP(0xaceda0, 0x86d0c0, 0xc000148000, 0xc000110000)
> /usr/local/go/src/net/http/server.go:2387 +0x1bd
> net/http.serverHandler.ServeHTTP(0xc0000d2000, 0x86d0c0, 0xc000148000,
> 0xc000110000)
> /usr/local/go/src/net/http/server.go:2802 +0xa4
> net/http.(*conn).serve(0xc0000ee000, 0x86d980, 0xc0000f2000)
> /usr/local/go/src/net/http/server.go:1890 +0x875
> created by net/http.(*Server).Serve
> /usr/local/go/src/net/http/server.go:2928 +0x384
> 2020/03/26 22:55:04 http: panic serving [::1]:41502: runtime error: invalid
> memory address or nil pointer dereference
> goroutine 8 [running]:
> net/http.(*conn).serve.func1(0xc000099180)
> /usr/local/go/src/net/http/server.go:1767 +0x139
> panic(0x7815e0, 0xabef60)
> /usr/local/go/src/runtime/panic.go:679 +0x1b2
> text/template.errRecover(0xc000054b30)
> /usr/local/go/src/text/template/exec.go:164 +0x1cb
> panic(0x7815e0, 0xabef60)
> /usr/local/go/src/runtime/panic.go:679 +0x1b2
> text/template.(*Template).execute(0x0, 0x867380, 0xc0001480e0, 0x7a01e0,
> 0xc0000fc060, 0x0, 0x0)
> /usr/local/go/src/text/template/exec.go:218 +0x1c1
> text/template.(*Template).Execute(...)
> /usr/local/go/src/text/template/exec.go:204
> main.Index(0x86d0c0, 0xc0001480e0, 0xc000114100)
> /home/dave/Go_workstation/src/web_calss/main.go:22 +0x11d
> net/http.HandlerFunc.ServeHTTP(0x802840, 0x86d0c0, 0xc0001480e0, 0xc000114100)
> /usr/local/go/src/net/http/server.go:2007 +0x44
> net/http.(*ServeMux).ServeHTTP(0xaceda0, 0x86d0c0, 0xc0001480e0, 0xc000114100)
> /usr/local/go/src/net/http/server.go:2387 +0x1bd
> net/http.serverHandler.ServeHTTP(0xc0000d2000, 0x86d0c0, 0xc0001480e0,
> 0xc000114100)
> /usr/local/go/src/net/http/server.go:2802 +0xa4
> net/http.(*conn).serve(0xc000099180, 0x86d980, 0xc000068500)
> /usr/local/go/src/net/http/server.go:1890 +0x875
> created by net/http.(*Server).Serve
> /usr/local/go/src/net/http/server.go:2928 +0x384
>
>
> Please see the following code
> *******************************************************************************Code********************************************************************************************
> package main
>
> import (
> "net/http"
> "text/template"
> "web_calss/controllers/demo_controller"
> )
>
> func main() {
> http.HandleFunc("/", Index)
> // http.HandleFunc("/demo/index", Index)
> http.ListenAndServe(":8000", nil)
> }
>
> func Index(w http.ResponseWriter, r *http.Request) {
>
> tmplt, _ := template.ParseFiles("views/demo_controller.index.html")
> data := demo_controller.Data{
> Age: 27,
> Username: "davetweetlive",
> }
> tmplt.Execute(w, data)
> }
>
> --
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