flutter_ssh: Error after upgraded to Flutter 1.12

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)
    • Flutter version 1.12.13+hotfix.5 at /Users/juanm04/dev/tools/flutter
    • Framework revision 27321ebbad (6 days ago), 2019-12-10 18:15:01 -0800
    • Engine revision 2994f7e1e6
    • Dart version 2.7.0

 
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/juanm04/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-29, build-tools 29.0.2
    • ANDROID_HOME = /Users/juanm04/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
    • All Android licenses accepted.

[✗] Xcode - develop for iOS and macOS
    ✗ Xcode installation is incomplete; a full installation is necessary for iOS development.
      Download at: https://developer.apple.com/xcode/download/
      Or install Xcode via the App Store.
      Once installed, run:
        sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
        sudo xcodebuild -runFirstLaunch
    ✗ CocoaPods not installed.
        CocoaPods is used to retrieve the iOS and macOS platform side's plugin code that responds to your plugin usage
        on the Dart side.
        Without CocoaPods, plugins will not work on iOS or macOS.
        For more info, see https://flutter.dev/platform-plugins
      To install:
        sudo gem install cocoapods

[✓] Android Studio (version 3.5)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 42.1.1
    • Dart plugin version 191.8593
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)

[!] IntelliJ IDEA Ultimate Edition (version 2019.2.4)
    • IntelliJ at /Applications/IntelliJ IDEA.app
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • For information about installing plugins, see
      https://flutter.dev/intellij-setup/#installing-the-plugins

[✓] VS Code (version 1.41.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.7.1

[✓] Connected device (1 available)
    • ONEPLUS A6013 • 192.168.86.123:5555 • android-arm64 • Android 10 (API 29)

About this issue

Original URL
State: open
Created 5 years ago
Reactions: 2
Comments: 16

Most upvoted comments

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 on Mar 15, 2020

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

JuanM04 on Jan 26, 2020

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

thomashuettmaier on Dec 17, 2019