Develop Reference

java.lang.NoClassDefFoundError: org.jumpmind.symmetric.io.stage.StagingManager$1, even though the class exists in the jar file

I am trying to integrate Symmetric-Android 3.10.2 in my Android application. It is showing
java.lang.NoClassDefFoundError:
org.jumpmind.symmetric.io.stage.StagingManager$1
Even the class exists in jarfile
I have upgraded my API level from 22 to 26 after reading article from
https://sourceforge.net/p/symmetricds/discussion/1354726/thread/f965364c00/
but the issue remains
java.lang.NoClassDefFoundError:
org.jumpmind.symmetric.io.stage.StagingManager$1
at org.jumpmind.symmetric.io.stage.StagingManager.(StagingManager.java:288)
at org.jumpmind.symmetric.android.AndroidSymmetricEngine.createStagingManager(AndroidSymmetricEngine.java:108)
at org.jumpmind.symmetric.AbstractSymmetricEngine.init(AbstractSymmetricEngine.java:348)
at org.jumpmind.symmetric.android.AndroidSymmetricEngine.(AndroidSymmetricEngine.java:84)
at org.jumpmind.symmetric.android.SymmetricService.onStartCommand(SymmetricService.java:88)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3944)
at android.app.ActivityThread.access$2300(ActivityThread.java:219)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1833)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6939)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)

It sounds like your issue may not be related to SymmetricDS, but instead how your classpath is configured in this Android project. There are several solutions in this thread that might help

How to add operations into Tensorflow Android build

I am trying to run my Tensorflow model on Android, so I am using the nightly native build in here and following the Android demo, I have been successfully get the Tensorflow Android lib running and loaded up the model with below code.
inferenceInterface = new TensorFlowInferenceInterface(getAssets(), MODEL_FILE);
And the log shows the results are good.
I/TensorFlowInferenceInterface: Successfully loaded TensorFlow native methods (RunStats error may be ignored)
I/TensorFlowInferenceInterface: Model load took 1007ms, TensorFlow version: 1.2.0-rc0
I/TensorFlowInferenceInterface: Successfully loaded model from 'file:///android_asset/model.pb'
However, when I finished feeding all the input nodes
inferenceInterface.feed("input1", new int[]{1, 2, 3}, 1, 3);
inferenceInterface.feed("input2", new int[]{3}, 1);
inferenceInterface.feed("input3", new int[]{4}, 1);
Then call the run method
inferenceInterface.run(new String[]{"output"});
The Tensorflow is broken saying that some kernels are not registered
E/TensorFlowInferenceInterface: Failed to run TensorFlow inference with inputs:[input1, input2, input3], outputs:[output]
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: ...jnitest, PID: 16357
java.lang.RuntimeException: Unable to start activity ComponentInfo{...MainActivity}: java.lang.IllegalArgumentException: No OpKernel was registered to support Op 'LessEqual' with these attrs. Registered devices: [CPU], Registered kernels:
<no registered kernels>
[[Node: .../LessEqual = LessEqual[T=DT_INT32](.../maximum_iterations, .../LessEqual/y)]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.IllegalArgumentException: No OpKernel was registered to support Op 'LessEqual' with these attrs. Registered devices: [CPU], Registered kernels:
<no registered kernels>
[[Node: dynamic_seq2seq/decoder/decoder_1/LessEqual = LessEqual[T=DT_INT32](.../maximum_iterations, .../LessEqual/y)]]
at org.tensorflow.Session.run(Native Method)
at org.tensorflow.Session.access$100(Session.java:48)
at org.tensorflow.Session$Runner.runHelper(Session.java:295)
at org.tensorflow.Session$Runner.run(Session.java:245)
at org.tensorflow.contrib.android.TensorFlowInferenceInterface.run(TensorFlowInferenceInterface.java:142)
at org.tensorflow.contrib.android.TensorFlowInferenceInterface.run(TensorFlowInferenceInterface.java:111)
at ...jnitest.MainActivity.onCreate(MainActivity.java:52)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
.. 9 more
I think the "LessEqual" for int32 should be defined in Tensorflow but just not built along with Tensorflow Android Lib.
So my question is how to include more kernels in the Android lib build or any other way to resolve this, any help will be much appreciated.

I recommending reading this free eBook: Building Mobile Applications with TensorFlow
It has a section on What Ops Are Available on Mobile? (page 33), which explains how to Add the implementation to the build for those op kernels which default to being stripped out for mobile builds.
FYI, the eBook is written by Pete Warden (GitHub, blog), who works at Google and is one of the maintainers of TensorFlow.

Unable to start Chrome CustomTabsIntent in my Android app

I am trying to use Chrome Custom Tabs in my Android application. My MainActivity class extends AppCompatActivity. In onCreate, I invoke startCustomTabs. Below is the code for that:
private void startCustomTab(){
CustomTabsIntent intent = new CustomTabsIntent.Builder().setToolbarColor(getResources().getColor(R.color.colorPrimary)).build();
intent.launchUrl(this, Uri.parse("http://github.com/black-dragon/SaavnExtractor"));
}
As soon as the app launches, it crashes with following the error:
11-16 10:55:38.561 30093-30093/com.nick.saavnextractor
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.nick.saavnextractor, PID: 30093
java.lang.NoSuchMethodError: No static method
startActivity(Landroid/app/Activity;Landroid/content/Intent;Landroid/os/Bundle;)V
in class Landroid/support/v4/app/ActivityCompat; or its super classes
(declaration of 'android.support.v4.app.ActivityCompat' appears in
/data/data/com.nick.saavnextractor/files/instant-run/dex/slice-com.android.support-support-compat-25.0.0_15c83dd4ec129d2d74bfda2e34f6aeeb93d83fa1-classes.dex)
at android.support.customtabs.CustomTabsIntent.launchUrl(CustomTabsIntent.java:262)
at com.nick.saavnextractor.MainActivity.startCustomTab(MainActivity.java:325)
at com.nick.saavnextractor.MainActivity.onCreate(MainActivity.java:111)
at android.app.Activity.performCreate(Activity.java:6311)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2409)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2539)
at android.app.ActivityThread.access$900(ActivityThread.java:159)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1384)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5507)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Note: If I execute the same code with the same methods in a new app, the Custom Tabs launch fine.

Okay, so here is the resolution. I was using build tools version 25.0.0 but my SDK platform was 24.
Update the build tools, platform tools & SDK to same version and then you won't face this issue.

Along with #Nick's answer, I also had to update the Facebook SDK version and the crash stopped happening.

You need to add Customtabs dependency in your build.gradle file.
implementation 'com.android.support:customtabs:28.0.0'

Android build variant debug gives java.lang.NoClassDefFoundError

I have been working on a project that has been perfectly fine, until i included the android-smack-xmpp library.
After this inclusion, i am not able to run the app on devices (API < 21) on debug mode. However i am able to run it on release build variant.
Process: com.example, PID: 496
java.lang.NoClassDefFoundError: com.example.network.ServerCalls$3
at com.example.network.ServerCalls.initData(ServerCalls.java:167)
at com.example.ui.fragmentsAndActivities.homeFeed.HomePageActivity.onCreate(HomePageActivity.java:212)
at android.app.Activity.performCreate(Activity.java:5248)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2162)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257)
at android.app.ActivityThread.access$800(ActivityThread.java:139)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5086)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
ServerCalls is included in the HomePageActivity, and compilation works just fine. What is that i could be missing here ?
Also HomePageActivity.java:212 is :
ServerCalls.samosaInitData()
Edit : I have been able to get it working my setting minifyEnabled and shrinkResources to true in gradle for the debug build. This is probably pointing at improper linking in the JVM. But this looks like a hack to me. Can somebody point me to a cleaner way of doing the same?

The error was multi-dexing the solution.
The smack-api library introduction led to the 64k dex limit to be exceeded.
Multidexing the solution does the trick.

It looks like you don't export your library in the final .apk file.
You have to choose the Compile option in your Android Studio project settings in the Dependencies section.

How work around java.lang.verifyerror in Android

I have an app which works perfect in all 4.x devices, but now I have a report of the app not working on a samsung_gt (advance) android 2.3.6. Here is the trace:
FATAL EXCEPTION: main
java.lang.VerifyError: com.bamobile.fdtks.activities.MainActivity
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1409)
at android.app.Instrumentation.newActivity(Instrumentation.java:1024)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1675)
at android.app.ActivityThread.access$1500(ActivityThread.java:121)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:943)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3770)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:670)
at dalvik.system.NativeStart.main(Native Method)
I have the latest support jar (v4) and have already patched the gson library in case the phone is already using it. The problem seems to be the the support lib. Any ideas? Thank you very much!

The most common cause of java.lang.VerifyError is having a class that uses methods that are not available on the version of Android where the app is running.
Based on your stacktrace, it seems that com.bamobile.fdtks.activities.MainActivity is using a method that is not available on Android 2.3.6, hence the "verification error" that you're seeing.
To fix it, change the minSdkVersion and of your app to 9 or 10 (Android 2.3.6) and look for errors/warnings about unsupported methods for that version of Android. You can also change (temporarily) both minSdkVersion and targetSdkVersion to 9 to force the compiler to fail when you use methods that are not found in Gingerbread devices.