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I'm getting the following crash report in Android development Console. My app runs fine on the simulator or devices that I tried the app on, but for some reason on a Galaxy Nexus (Maguro) it doesn't run. I don't get any compile errors either.
java.lang.NoClassDefFoundError: java.util.Objects
at com.nivelsonic.nivelsonic.MyTankActivity$5.onResponse(MyTankActivity.java:199)
at com.nivelsonic.nivelsonic.MyTankActivity$5.onResponse(MyTankActivity.java:160)
at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60)
at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30)
at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
MyTankActivity.java
public void drawTankStatus() {
tankView = (TankView) this.findViewById(R.id.vMyTank);
tvLocation = (TextView) this.findViewById(R.id.tvLocation);
tvLevel = (TextView) this.findViewById(R.id.tvLevel);
ivRssi = (ImageView) this.findViewById(R.id.ivRssi);
ivSettings = (ImageView) this.findViewById(R.id.ivSettings);
ivAlert = (ImageView) this.findViewById(R.id.ivAlert);
final Response.Listener<String> responseListener = new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonResponse = new JSONObject(response);
//int success = jsonResponse.getInt("success");
JSONArray tank_data = jsonResponse.getJSONArray("tank_data");
if (tank_data.length() > 0) {
int i;
for (i = 0; i < tank_data.length(); i++) {
//Log.v("Result--", "" + tank_data.getString(i));
JSONObject tankObj = tank_data.getJSONObject(0);
location = (String) tankObj.getString("Location");
color = (String) tankObj.getString("Color");
level = (int) tankObj.getInt("CurrentLevel");
rssi = (int) tankObj.getInt("RSSI");
phone = (String) tankObj.getString("Phone");
status = (int) tankObj.getInt("Status");
Integer numOfNotifications = tankObj.getInt("NumberOfNotifications");
if (numOfNotifications > 0) {
ivAlert.setImageResource(R.drawable.alert_red);
} else {
ivAlert.setImageResource(R.drawable.alert);
}
tvLocation.setText(location);
if (level <= 55) {
tvLevel.setTextColor(Color.parseColor("#064e7b"));
} else {
// colo rvariable gets set from a value calculated in A_get_tanks.php
if (Objects.equals("#FFFFAD", color)) {
tvLevel.setTextColor(Color.parseColor("#064e7b"));
} else {
tvLevel.setTextColor(Color.parseColor("#FFFFFF"));
}
}
String levelPercent = Integer.toString(level);
tvLevel.setText(levelPercent + "%");
if (status != 0) {
switch (rssi) {
case 0:
ivRssi.setImageResource(R.drawable.rssi0);
break;
case 1:
ivRssi.setImageResource(R.drawable.rssi1);
break;
case 2:
ivRssi.setImageResource(R.drawable.rssi2);
break;
case 3:
ivRssi.setImageResource(R.drawable.rssi3);
break;
case 4:
ivRssi.setImageResource(R.drawable.rssi4);
break;
case 5:
ivRssi.setImageResource(R.drawable.rssi5);
break;
}
} else {
ivRssi.setImageResource(R.drawable.disconnected);
}
tankView.drawLevel(level, color);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
};
Intent intent = getIntent();
userid = intent.getStringExtra("userid");
impid = intent.getStringExtra("impid");
MyTankRequest myTankRequest = new MyTankRequest(userid, responseListener);
RequestQueue queue = Volley.newRequestQueue(MyTankActivity.this);
queue.add(myTankRequest);
if (ivSettings != null) {
ivSettings.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent settingsIntent = new Intent(MyTankActivity.this, SettingsActivity.class);
settingsIntent.putExtra("impid", impid);
MyTankActivity.this.startActivity(settingsIntent);
}
});
}
}
631
You can fix NoClassDefFoundError error by checking following: Check the exception stack trace to know exactly which class throw the error and which is the class not found by java.
The NoClassDefFoundError is a runtime error in Java that occurs if the Java Virtual Machine (JVM) or a ClassLoader instance attempts to load the definition of a class that could not be found. The class definition exists at compile-time but is not available at runtime.
It is thrown by the Java Runtime System when the class definition is not found at run time. Developers can handle an exception using a try and catch block or any other method for preventing the program from crashing. The program will crash whenever NoClassDefFoundError will occur.
The exception is thrown because all static methods of java.util.Objects are available above API 19 (Android 4.4.+).
As you said in comments, your device has API 10 (Android 2.3.+) so that method doesn't exist in that Android version and NoClassDefFoundError is thrown.
If you want to check api level programmatically you can do:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
// your code available only above api 19
} else {
// compatibility code
}
In my case this exception happened on Android 4 after upgrade to Retrofit 2.7.1.
See https://github.com/square/retrofit/blob/master/CHANGELOG.md:
Version 2.7.0 (2019-12-09)
This release changes the minimum requirements to Java 8+ or Android 5+. See this blog post for more information on the change.
New: Upgrade to OkHttp 3.14.4. Please see its changelog for 3.x.
See also https://github.com/square/retrofit/issues/3201 and https://github.com/square/retrofit/issues/3042.
Retrofit depends on OkHttp that refused pre API 21 support in version 3.13.
So, downgrade Retrofit to 2.6.4 or even before 2.6.0. I checked, it solved the problem. Also downgrade Retrofit Gson converter (com.squareup.retrofit2:converter-gson) to 2.6.4.
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