Develop Reference

Release app crash FATAL EXCEPTION: create_react_context (React Native)

I can build in debug mode, it works fine, but when I get release build, it gets build, but the application breaks, you can see the error output here.
FATAL EXCEPTION: create_react_context
java.lang.RuntimeException: Unable to load script. Make sure you're either running a Metro server (run 'react-native start') or that your bundle 'index.android.bundle' is packaged correctly for release.
FATAL EXCEPTION: create_react_context
Process: com.example, PID: 27990
java.lang.RuntimeException: Unable to load script. Make sure you're either running a Metro server (run 'react-native start') or that your bundle 'index.android.bundle' is packaged correctly for release.
at com.facebook.react.bridge.CatalystInstanceImpl.jniLoadScriptFromAssets(Native Method)
at com.facebook.react.bridge.CatalystInstanceImpl.loadScriptFromAssets(Unknown Source:2)
at com.facebook.react.bridge.JSBundleLoader$1.loadScript(Unknown Source:10)
at com.facebook.react.bridge.CatalystInstanceImpl.runJSBundle(Unknown Source:18)
at com.facebook.react.q.q(Unknown Source:180)
at com.facebook.react.q.b(Unknown Source:0)
at com.facebook.react.q$e.run(Unknown Source:68)
at java.lang.Thread.run(Thread.java:764)
"react-native": "0.62.2"

This is a 0.62.2 version issue that was solved here.
Long story short,
Edit ../../node_modules/react-native/react.gradle with this fix

Android Runtime Error using Scala and libGDX with Gradle

I want to build android apk in my libGdx project but I got this error shows up
My other projects with libgdx and scala works well.
I have it on this part of the code:
tempArray = stage.getActors.items.array.filter(_ != null).filter(_.getName == "ball1")
W/com.scala.gdx: Accessing hidden method Ljava/lang/invoke/VarHandle;->releaseFence()V (blacklist, reflection, denied)
E/AndroidRuntime: FATAL EXCEPTION: GLThread 456
Process: com.scala.gdx, PID: 8618
java.lang.ExceptionInInitializerError
...
at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1557)
at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1272)
Caused by: java.lang.NoSuchMethodException: java.lang.invoke.VarHandle.releaseFence []
at java.lang.Class.getMethod(Class.java:2072)
at java.lang.Class.getDeclaredMethod(Class.java:2050)
at java.lang.invoke.MethodHandles$Lookup.findStatic(MethodHandles.java:782)
...
at a.a.a.p.a.l.onSurfaceChanged(:310) 
at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1557) 
at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1272) 

How to fix “Unable to find free port” error in Java (android)

I am using selenium Chromedriver and whenever I am running this on a device I am getting the below error.
2019-09-13 23:10:58.671 11984-11984/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myapplication, PID: 11984
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.MainActivity}: java.lang.RuntimeException: Unable to find a free port
Can anybody help out in this?

How to test fingerprint on emulator in ui tests

In ui test I run:
InstrumentationRegistry
.getInstrumentation()
.uiAutomation
.executeShellCommand("-e emu finger touch 45146572")//or"adb -e emu finger touch 45146572"
and then I have got exception:
*** FATAL EXCEPTION IN SYSTEM PROCESS: Thread-10
java.lang.RuntimeException: Error running shell command
at android.app.UiAutomationConnection$1.run(UiAutomationConnection.java:295)
Caused by: java.io.IOException: Error running exec(). Command: [-e, emu, finger, touch, 45146572] Working Directory: null Environment: null
at java.lang.ProcessManager.exec(ProcessManager.java:211)
at java.lang.Runtime.exec(Runtime.java:174)
at java.lang.Runtime.exec(Runtime.java:247)
at java.lang.Runtime.exec(Runtime.java:190)
at android.app.UiAutomationConnection$1.run(UiAutomationConnection.java:281)
Caused by: java.io.IOException: No such file or directory
at java.lang.ProcessManager.exec(Native Method)
at java.lang.ProcessManager.exec(ProcessManager.java:209)
at java.lang.Runtime.exec(Runtime.java:174) 
at java.lang.Runtime.exec(Runtime.java:247) 
at java.lang.Runtime.exec(Runtime.java:190) 
at android.app.UiAutomationConnection$1.run(UiAutomationConnection.java:281) 
Do you have any idea how to fix that?

CLJSRN Release Build Runtime Failure

I inherited this CLJS React Native codebase and I'm trying to upgrade the Android SDK to v26 with React 16.4 and RN 0.56. The debug build works great but the release build fails when starting up with the following call stack:
2018-11-21 10:31:30.731 16727-16790/? E/AndroidRuntime: FATAL EXCEPTION: mqt_native_modules
Process: XXX, PID: 16727
com.facebook.react.common.JavascriptException: Can't find variable: a, stack:
<unknown>#12:60553
<unknown>#12:60366
<unknown>#12:518500
c#2:822
i#2:394
t#2:324
global code#322:8
at com.facebook.react.modules.core.ExceptionsManagerModule.showOrThrowError(ExceptionsManagerModule.java:54)
at com.facebook.react.modules.core.ExceptionsManagerModule.reportFatalException(ExceptionsManagerModule.java:38)
at java.lang.reflect.Method.invoke(Native Method)
at com.facebook.react.bridge.JavaMethodWrapper.invoke(JavaMethodWrapper.java:372)
at com.facebook.react.bridge.JavaModuleWrapper.invoke(JavaModuleWrapper.java:160)
at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:29)
at android.os.Looper.loop(Looper.java:193)
at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:192)
at java.lang.Thread.run(Thread.java:764)
Any ideas on how to get the non-minified version of the call stack? Is the minification done by the cljs to js compiler? Or the RN bundler/packager?
I'm currently using advanced optimizations on the cljs to js compiler. If I switch it to whitespace optimizations, then I get a build error
transform[stderr]: FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
I can work around it by doing the bundling separately
node --expose-gc --max_old_space_size=4096 ./node_modules/react-native/local-cli/cli.js bundle --verbose --platform android --dev true --reset-cache --entry-file index.android.js --bundle-output /usr/src/app/android/app/build/intermediates/assets/release/index.android.bundle --assets-dest /usr/src/app/android/app/build/intermediates/res/merged/release
But I hit another failure
Unable to load script from assets 'index.android.bundle'.
Any ideas what else I can try?
Update 1: The "Unable to load script from assets 'index.android.bundle'." error message was caused by the index.android.bundle file being placed in the wrong folder. The following command worked:
node --expose-gc --max_old_space_size=4096 ./node_modules/react-native/local-cli/cli.js bundle --verbose --platform android --dev true --reset-cache --entry-file index.android.js --bundle-output /usr/src/app/android/app/src/main/assets/index.android.bundle --assets-dest /usr/src/app/android/app/src/main/res/
The unminified call stack looks like:
2018-11-27 15:07:00.740 23765-23859/? E/ReactNativeJNI: Got JS Exception: Can't find variable: document (index.android.bundle:1632)
2018-11-27 15:07:00.740 23765-23859/? E/ReactNativeJNI: Got JS Stack: index.android.bundle:1632:43
loadModuleImplementation#index.android.bundle:162:14
guardedLoadModule#index.android.bundle:83:47
metroRequire#index.android.bundle:72:79
global code#index.android.bundle:1639:8
2018-11-27 15:07:00.749 23765-23859/? E/AndroidRuntime: FATAL EXCEPTION: mqt_js
Process: XXX, PID: 23765
java.lang.RuntimeException: com.facebook.react.devsupport.JSException: Can't find variable: document (index.android.bundle:1632)
at com.facebook.react.bridge.DefaultNativeModuleCallExceptionHandler.handleException(DefaultNativeModuleCallExceptionHandler.java:22)
at com.facebook.react.devsupport.DisabledDevSupportManager.handleException(DisabledDevSupportManager.java:170)
at com.facebook.react.bridge.CatalystInstanceImpl.onNativeException(CatalystInstanceImpl.java:525)
at com.facebook.react.bridge.CatalystInstanceImpl.access$1000(CatalystInstanceImpl.java:39)
at com.facebook.react.bridge.CatalystInstanceImpl$NativeExceptionHandler.handleException(CatalystInstanceImpl.java:541)
at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:31)
at android.os.Looper.loop(Looper.java:193)
at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:192)
at java.lang.Thread.run(Thread.java:764)
Caused by: com.facebook.react.devsupport.JSException: Can't find variable: document (index.android.bundle:1632)
at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:29)
at android.os.Looper.loop(Looper.java:193) 
at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:192) 
at java.lang.Thread.run(Thread.java:764) 
Caused by: com.facebook.jni.CppException: Can't find variable: document (index.android.bundle:1632)
at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method) 
at android.os.Handler.handleCallback(Handler.java:873) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:29) 
at android.os.Looper.loop(Looper.java:193) 
at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:192) 
at java.lang.Thread.run(Thread.java:764) 

APK worked OK after I restarted the RN upgrade process with react-native-git-upgrade. There was another issue after the upgrade with some unresolved symbol during runtime but that turned out to be an issue with the externs file because I had switched from the deprecated BackAndroid to BackHandler.