On Tue Sep 10, 2019 at 4:26 AM Jay Sharma wrote:
> ------=_Part_1258_983331168.1568114760099
> Content-Type: text/plain; charset="UTF-8"
>
> Hello @elias,
>
> I tried the following:
>
> 1. Created a java class :
>
> package reversebinding;
>
> public class RBinding {
> public static String getStringFromJava() {
> return "Hello from java !!";
> }
> }
>
> 2. Generated the .class file for this file.
>
> 3. Generated the android binding using gomobile tool and used
> -classpath="Path to my .class file"
>
> 4. Binding is generated successfully.
>
> *But when I used that generated (.aar) file in my android app and tried to
> trigger the api it is crashing; *
>
> 2019-09-10 16:36:54.199 9400-9430/com.sample E/GoLog: 2019/09/10 11:06:54
> test.go:134: testFunction [Test]
> 2019-09-10 16:36:54.199 9400-9430/com.sample E/GoLog: 2019/09/10 11:06:54
> test.go:136: [Test] Now going to call a java system function
> (System.CurrentTimeMillis()).....
> 2019-09-10 16:36:54.200 9400-9434/com.sample E/GoLog: 2019/09/10 11:06:54
> test.go:138: [Test] Called java function return value is: 1568113614199
> 2019-09-10 16:36:54.200 9400-9434/com.sample E/GoLog: 2019/09/10 11:06:54
> test.go:140: [Test] Now going to call my java function.....
> 2019-09-10 16:36:54.203 9400-0/com.sample E/Go: panic: runtime error:
> invalid memory address or nil pointer dereference
> 2019-09-10 16:36:54.203 9400-0/com.sample E/Go: [signal SIGSEGV:
> segmentation violation code=0x1 addr=0x0 pc=0x7568010708]
> 2019-09-10 16:36:54.203 9400-0/com.sample E/Go: goroutine 17 [running,
> locked to thread]:
> 2019-09-10 16:36:54.203 9400-0/com.sample E/Go:
> test.testFunction(0x4000000738)
> 2019-09-10 16:36:54.203 9400-0/com.sample E/Go:
> /home/test/2019/test/test.go:141 +0x190
> 2019-09-10 16:36:54.203 9400-0/com.sample E/Go:
> main.proxytest__testFunction(...)
> 2019-09-10 16:36:54.203 9400-0/com.sample com.sample E/Go:
> /tmp/gomobile-work-071468276/src/gobind/go_testmain.go:199
> 2019-09-10 16:36:54.203 9400-0/com.sample E/Go:
> main._cgoexpwrap_5427a26f9204_proxytest__testFunction(0x8020080280200802)
> 2019-09-10 16:36:54.203 9400-0/com.sample E/Go: _cgo_gotypes.go:606
> +0x1c
> 2019-09-10 16:36:54.204 9400-9423/com.sample A/libc: Fatal signal 6
> (SIGABRT), code -6 in tid 9423 (Thread-2)
>
The error is arguably not very helpful. Are you sure there is not another error
before the nil pointer exception? In any case, did you ensure that the .class
is included in the Android apk? An easy check is to try to call your method
from Java before trying from Go.
-- elias
--
You received this message because you are subscribed to the Google Groups
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to golang-nuts+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/golang-nuts/BWWFDRSGTVCY.3RJOHGGDYAVUF%40toolbox.
