Cloudmine java.lang.NoClassDefFoundError：无法解决以下问题：Lorg / slf4j / LoggerFactory;

Question

I am trying to store some data using Cloudmine.

However, I got the error java.lang.NoClassDefFoundError: Failed resolution of: Lorg/slf4j/LoggerFactory; when I call initialize() for authorization.

I'm not running on a separate thread or something. I'm testing stuff out right now so I just have it so that when a button is clicked, it uploads some information from some EditText fields.

This is my code

public class ButtonClick implements View.OnClickListener {
    private MainWindowActivity mainWindowActivity;

    public ButtonClick(MainWindowActivity mainWindowActivity, Button doneBtn, Button addBtn) {
        this.mainWindowActivity = mainWindowActivity;

        addBtn.setEnabled(true);
        addBtn.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
       // This will initialize your credentials
       // ERROR HERE
       CMApiCredentials initialize = CMApiCredentials.initialize("id", "key"); 

       SimpleCMObject location = new SimpleCMObject();
       location.add("address", Runner.getAddressStr());
       location.add("city", Runner.getCityStr());
       location.add("state", Runner.getStateStr());
       location.add("zip", Runner.getZipStr());

       location.save(new ObjectModificationResponseCallback() {
                    public void onCompletion(ObjectModificationResponse response) {
                        Toast.makeText(mainWindowActivity, "Location saved: " + response.wasSuccess(), Toast.LENGTH_SHORT).show();
                    }
                });

        EditText address = (EditText) mainWindowActivity.findViewById(R.id.address);
                address.setText("");
        EditText city = (EditText) mainWindowActivity.findViewById(R.id.city);
                city.setText("");
        EditText state = (EditText) mainWindowActivity.findViewById(R.id.state);
                state.setText("");
        EditText zip = (EditText) mainWindowActivity.findViewById(R.id.zip);
                zip.setText("");

    }
}

This is the Logcat:

Process: prog, PID: 26580
    java.lang.NoClassDefFoundError: Failed resolution of: Lorg/slf4j/LoggerFactory;
            at com.cloudmine.api.CMApiCredentials.<clinit>(CMApiCredentials.java:21)
            at prog.ButtonClick.onClick(ButtonClick.java:52)
            at android.view.View.performClick(View.java:4780)
            at android.view.View$PerformClick.run(View.java:19866)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5257)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "org.slf4j.LoggerFactory" on path: DexPathList[[zip file "/data/app/prog-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
            at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
            at com.cloudmine.api.CMApiCredentials.<clinit>(CMApiCredentials.java:21)
            at prog.ButtonClick.onClick(ButtonClick.java:52)
            at android.view.View.performClick(View.java:4780)
            at android.view.View$PerformClick.run(View.java:19866)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5257)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
    Suppressed: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
            at java.lang.Class.classForName(Native Method)
            at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
            at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
            ... 13 more
     Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

Answer 1

As I have commented, download zip file from SLF4J distribution and use as library in your project. Then, use slf4j-api-1.7.12.jar (and slf4j-android-1.7.12.jar if needed).

Answer 2

I hade the same problem only on Android 5.0 - 5.1 (a real device and emulators). At that moment, I used Android Studio 2.3.3 and build tools v26.

I solved the problem turning off Instant Run that I didn't use anyway.

Steps: go to File -> Settings -> Build, Execution, Deployment -> Instant run Disable it (first checkbox).

Answer 3

I had the same error and found this solution on github.

Just add the following to your grandle:

implementation 'org.slf4j:slf4j-api:1.7.25'

https://github.com/nomis/slf4j-android