x/mobile: `gomobile bind golang.org/x/mobile/example/reverse/reverse` fails on macOS #17945

hajimehoshi · 2016-11-16T17:40:54Z

What version of Go are you using (`go version`)?

go version go1.7 darwin/amd64

What operating system and processor architecture are you using (`go env`)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/hajimehoshi/go"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/7t/qw3np69559591s1v0mk5_p1m0000gn/T/go-build948107820=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"

What did you do?

If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.

$ gomobile bind golang.org/x/mobile/example/reverse/reverse
gomobile: loadExportData failed go install -pkgdir=/Users/hajimehoshi/go/pkg/gomobile/pkg_android_arm -tags="" -gcflags=-shared -ldflags=-shared golang.org/x/mobile/example/reverse/reverse failed: exit status 1
../../../golang.org/x/mobile/example/reverse/reverse/reverse.go:9:2: cannot find package "Java/android/databinding/DataBindingUtil" in any of:
        /usr/local/go/src/Java/android/databinding/DataBindingUtil (from $GOROOT)
        /var/folders/7t/qw3np69559591s1v0mk5_p1m0000gn/T/gomobile-work-600308528/gen/src/Java/android/databinding/DataBindingUtil (from $GOPATH)
        /Users/hajimehoshi/go/src/Java/android/databinding/DataBindingUtil
../../../golang.org/x/mobile/example/reverse/reverse/reverse.go:11:2: cannot find package "Java/android/support/v7/app" in any of:
        /usr/local/go/src/Java/android/support/v7/app (from $GOROOT)
        /var/folders/7t/qw3np69559591s1v0mk5_p1m0000gn/T/gomobile-work-600308528/gen/src/Java/android/support/v7/app (from $GOPATH)
        /Users/hajimehoshi/go/src/Java/android/support/v7/app
../../../golang.org/x/mobile/example/reverse/reverse/reverse.go:12:2: cannot find package "Java/go/reverse/R/layout" in any of:
        /usr/local/go/src/Java/go/reverse/R/layout (from $GOROOT)
        /var/folders/7t/qw3np69559591s1v0mk5_p1m0000gn/T/gomobile-work-600308528/gen/src/Java/go/reverse/R/layout (from $GOPATH)
        /Users/hajimehoshi/go/src/Java/go/reverse/R/layout
../../../golang.org/x/mobile/example/reverse/reverse/reverse.go:13:2: cannot find package "Java/go/reverse/databinding/ActivityMainBinding" in any of:
        /usr/local/go/src/Java/go/reverse/databinding/ActivityMainBinding (from $GOROOT)
        /var/folders/7t/qw3np69559591s1v0mk5_p1m0000gn/T/gomobile-work-600308528/gen/src/Java/go/reverse/databinding/ActivityMainBinding (from $GOPATH)
        /Users/hajimehoshi/go/src/Java/go/reverse/databinding/ActivityMainBinding

$ gomobile version
gomobile version +b8794a2 Thu Nov 3 14:40:43 2016 +0000 (android,ios); androidSDK=/Users/hajimehoshi/Library/Android/sdk/platforms/android-24

What did you expect to see?

Successfully build.

What did you see instead?

Build error (packages beginning with Java are not found).

The text was updated successfully, but these errors were encountered:

hajimehoshi · 2017-01-25T17:12:38Z

The situation has changed a little: the current error message is

$ gomobile bind golang.org/x/mobile/example/reverse/reverse
gomobile: failed to find Java class android.support.v7.app.AppCompatActivity, embedded by reverse.MainActivity

Is this expected?

eliasnaur · 2017-02-07T14:18:27Z

That's expected, you can't directly gomobile bind the reverse package since it depends on Java classes defined by the gradle build. Go to example/reverse/android and run gradlew installDebug from there instead.

hajimehoshi · 2017-02-07T15:03:58Z

Thank you. I've succeeded gradle on macOS.

BTW, can I request a feature to make it enable to gomobile-bind this without gradle?

eliasnaur · 2017-02-07T15:30:43Z

You can do so already, by replicating what the gobind gradle plugin does. For simple cases, adding -classpath to gomobile will be enough. For the hard cases where Go code references Java code that itself references Go types, the the gobind tool is used to generate the Java classes for exported Go types and functions, breaking the reference cycle.

hajimehoshi · 2017-02-07T16:27:45Z

Thanks, but I still don't understand what path should be specified for classpath.

eliasnaur · 2017-02-07T20:03:25Z

the gomobile bind takes a -classpath argument that should point to the class path with (in your case) the support library. Den tir. 7. feb. 2017 17.28 skrev Hajime Hoshi <notifications@github.com>:

…

Thanks, but I still don't understand what path should be specified for classpath. What did you mean "classpath to gomobile"? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#17945 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAgCDHEQDeOex89hs8wc9Y_Xm3xGCv09ks5raJuqgaJpZM4K0NB3> .

microo8 · 2017-03-10T07:26:41Z

I've managed to build the reverse.go example with gradle successfully, but how is that when I add some java.lang imports to the reverse.go:

import (
	"Java/android/databinding/DataBindingUtil"
	"Java/android/os"
	"Java/android/support/v7/app"
	gopkg "Java/reverse"
	rlayout "Java/reverse/R/layout"
	"Java/reverse/databinding"
	"Java/reverse/databinding/ActivityMainBinding"
	"Java/java/lang/Float"
	"Java/java/lang"
)

then use it somewhere:

type MainActivity struct {
	app.AppCompatActivity
	binding databinding.ActivityMainBinding
	f lang.Float
}

and run ./gradlew assembleDebug then gobind will fail on that it cannot find java.lang packages?

:gomobileDebug
/home/micro/Workspace/bin/gomobile: loadExportData failed go install -pkgdir=/home/micro/Workspace/pkg/gomobile/pkg_android_arm -gcflags=-shared -ldflags=-shared golang.org/x/mobile/example/reverse/reverse failed: exit status 1
../reverse/reverse.go:20:2: cannot find package "Java/java/lang" in any of:
        /usr/lib/go/src/Java/java/lang (from $GOROOT)
        /tmp/gomobile-work-119975885/gen/src/Java/java/lang (from $GOPATH)
        /home/micro/Workspace/src/Java/java/lang
../reverse/reverse.go:19:2: cannot find package "Java/java/lang/Float" in any of:
        /usr/lib/go/src/Java/java/lang/Float (from $GOROOT)
        /tmp/gomobile-work-119975885/gen/src/Java/java/lang/Float (from $GOPATH)
        /home/micro/Workspace/src/Java/java/lang/Float

:gomobileDebug FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':gomobileDebug'.
> Process 'command '/home/micro/Workspace/bin/gomobile'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

eliasnaur · 2017-03-25T11:23:36Z

I've mailed https://go-review.googlesource.com/38635 that should fix your case.

gopherbot · 2017-03-25T11:31:18Z

CL https://golang.org/cl/38635 mentions this issue.

Before this CL, unexported fields were ignored for the purposes of determining which classes a Go struct should extend or implement. However, the field types were also ignored, resulting in the types not being generated at all. This CL adds the types of unexported fields to the set of types to be generated. Fixes golang/go#17945 Change-Id: I5c6c44b7cdfe0c3d4c4dc44863ae201dca7ae9a4 Reviewed-on: https://go-review.googlesource.com/38635 Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

hajimehoshi changed the title ~~gomobile bind golang.org/x/mobile/example/reverse/reverse fails on macOS~~ x/mobile: gomobile bind golang.org/x/mobile/example/reverse/reverse fails on macOS Nov 16, 2016

quentinmit added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Nov 16, 2016

quentinmit added this to the Unreleased milestone Nov 16, 2016

ALTree mentioned this issue Feb 1, 2017

x/mobile: gomobile bind looking for wrong file? #18876

Closed

hajimehoshi mentioned this issue Apr 9, 2017

why not use gomobie native for ios/android hajimehoshi/ebiten#340

Closed

hajimehoshi mentioned this issue Apr 18, 2017

audio: Rewrite Android part with new Java importing hajimehoshi/ebiten#269

Closed

gopherbot closed this as completed in golang/mobile@0f31740 Apr 19, 2017

golang locked and limited conversation to collaborators Apr 19, 2018

gopherbot added the FrozenDueToAge label Apr 19, 2018

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x/mobile: `gomobile bind golang.org/x/mobile/example/reverse/reverse` fails on macOS #17945

x/mobile: `gomobile bind golang.org/x/mobile/example/reverse/reverse` fails on macOS #17945

hajimehoshi commented Nov 16, 2016

hajimehoshi commented Jan 25, 2017

eliasnaur commented Feb 7, 2017

hajimehoshi commented Feb 7, 2017

eliasnaur commented Feb 7, 2017

hajimehoshi commented Feb 7, 2017 •

edited

eliasnaur commented Feb 7, 2017 via email

microo8 commented Mar 10, 2017 •

edited

eliasnaur commented Mar 25, 2017

gopherbot commented Mar 25, 2017

x/mobile: gomobile bind golang.org/x/mobile/example/reverse/reverse fails on macOS #17945

x/mobile: gomobile bind golang.org/x/mobile/example/reverse/reverse fails on macOS #17945

Comments

hajimehoshi commented Nov 16, 2016

What version of Go are you using (go version)?

What operating system and processor architecture are you using (go env)?

What did you do?

What did you expect to see?

What did you see instead?

hajimehoshi commented Jan 25, 2017

eliasnaur commented Feb 7, 2017

hajimehoshi commented Feb 7, 2017

eliasnaur commented Feb 7, 2017

hajimehoshi commented Feb 7, 2017 • edited

eliasnaur commented Feb 7, 2017 via email

microo8 commented Mar 10, 2017 • edited

eliasnaur commented Mar 25, 2017

gopherbot commented Mar 25, 2017

x/mobile: `gomobile bind golang.org/x/mobile/example/reverse/reverse` fails on macOS #17945

x/mobile: `gomobile bind golang.org/x/mobile/example/reverse/reverse` fails on macOS #17945

What version of Go are you using (`go version`)?

What operating system and processor architecture are you using (`go env`)?

hajimehoshi commented Feb 7, 2017 •

edited

microo8 commented Mar 10, 2017 •

edited