runtime error: invalid memory address

[davetw...@gmail.com]

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)

}

[Ian Lance Taylor]

Check the error returned by template.ParseFiles.

Always check error returns.

Ian

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