Error after upgraded to Flutter 1.12

[JuanM04]

For some reason, it does work when I'm debugging; but after I build the production APK, it throws this error:

PlatformException(connection_failure, java.lang.ClassNotFoundException: com.jcraft.jsch.jce.Random, null)

Flutter Doctor

[✓] Flutter (Channel stable, v1.12.13+hotfix.5, on Mac OS X 10.15.1 19B88, locale en-US)
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[thomashuettmaier]

Had the same issues this solved it for me:

• Run flutter build apk --release
• Ignore all warning like ssh uses unsafe operations
• Open the android folder in Android Studio
• Let the indexing and the gradle sync process finish
• Change the Build Variants to release
• Then: Build / Generate Signed Bundle/APK

[JuanM04]

@thomashuettmaier Thanks, that worked for me! How can I do it with flutter build apk --split-per-abi?

[tc14077]

I also encountered this issue. The error log shows:

/flutter/.pub-cache/hosted/pub.dartlang.org/ssh-0.0.5/android/src/main/java/sq/flutter/ssh/SshPlugin.java:404: warning: [unchecked] unchecked conversion
          Vector<LsEntry> files = channelSftp.ls(args.get("path").toString());
                                                ^                       
  required: Vector<ChannelSftp.LsEntry>                                 
  found:    Vector
1 warning  

* What went wrong:                                                      
Execution failed for task ':ssh:verifyReleaseResources'.                
> java.util.concurrent.ExecutionException: com.android.builder.internal.aapt.v2.Aapt2Exception: Android resource linking failed
  myapp/build/ssh/intermediates/res/merged/release/values/values.xml:236: error: resource android:attr/fontVariationSettings not found.
  myapp/build/ssh/intermediates/res/merged/release/values/values.xml:237: error: resource android:attr/ttcIndex not found.
  error: failed linking references.      

Anyone has ideas on it?

[thomashuettmaier]

@thomashuettmaier Thanks, that worked for me! How can I do it with flutter build apk --split-per-abi?

Sorry I don't have an idea how to do that.

[JuanM04]

I also encountered this issue. The error log shows:

/flutter/.pub-cache/hosted/pub.dartlang.org/ssh-0.0.5/android/src/main/java/sq/flutter/ssh/SshPlugin.java:404: warning: [unchecked] unchecked conversion
          Vector<LsEntry> files = channelSftp.ls(args.get("path").toString());
                                                ^                       
  required: Vector<ChannelSftp.LsEntry>                                 
  found:    Vector
1 warning  

* What went wrong:                                                      
Execution failed for task ':ssh:verifyReleaseResources'.                
> java.util.concurrent.ExecutionException: com.android.builder.internal.aapt.v2.Aapt2Exception: Android resource linking failed
  myapp/build/ssh/intermediates/res/merged/release/values/values.xml:236: error: resource android:attr/fontVariationSettings not found.
  myapp/build/ssh/intermediates/res/merged/release/values/values.xml:237: error: resource android:attr/ttcIndex not found.
  error: failed linking references.      

Anyone has ideas on it?

It says :ssh:verifyReleaseResources, so maybe there is an error when building the APK

[Nico04]

Any progress on this issue ? The workaround doesn't work for me (or maybe I didn't fully understand it)

[JuanM04]

I just set API level ≥ 21. My app simply doesn't support Android 4.4 now

[Nico04]

I just set API level ≥ 21. My app simply doesn't support Android 4.4 now

targetSdkVersion is 28, and minSdkVersion is 18, but I'm testing on Android 9.0, so I don't see the link that this issue may have with minSdkVersion ?

[JuanM04]

I did that, worked for a while weirdly, and then I stopped using this package

[Nico04]

I did that, worked for a while weirdly, and then I stopped using this package

You found an alternative ?

[JuanM04]

No to flutter_ssh, I just found an alternative to solve my particular problem

[Diviloper]

I managed to solve the crash in the production APK by adding the --no-shrink flag to the build:

flutter build apk --no-shrink --split-per-abi

My only guess is that the code shrinker thinks the library is not in use and deletes it Hope it helps

[Nico04]

The workaround also works for me with appbundle flutter build apk --no-shrink

Any idea how to really fix this ?

[zuiwuchang]

com.jcraft.jsch.jce.Random

i have same problem,but i solved it

first edit android/app/build.gradle enable minifyEnabled and useProguard

 buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.release

            minifyEnabled true
            useProguard true

            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

then create android/app/proguard-rules.pro and write class com.jcraft.,my document like this

#Flutter Wrapper
-keep class io.flutter.app.** { *; }
-keep class io.flutter.plugin.**  { *; }
-keep class io.flutter.util.**  { *; }
-keep class io.flutter.view.**  { *; }
-keep class io.flutter.**  { *; }
-keep class io.flutter.plugins.**  { *; }
-keep class com.jcraft.**  { *; }

[zuiwuchang]

Any progress on this issue ? The workaround doesn't work for me (or maybe I didn't fully understand it)

https://github.com/shaqian/flutter_ssh/issues/27#issuecomment-599180850