java.util.MissingResourceException-定位日志记录类时出错（MQTT库）

Question

I'm writing an Android app that uses MQTT.

On release build I get an exception on the line :

MqttClient client = new MqttClient(host, clientId, new MemoryPersistence()); 

On debug build, all works fine. I'm using mqtt-client-0.4.0.jar .

The execption (that i get in release is) :

W/System.err: java.util.MissingResourceException: Error locating the logging class
W/System.err:     at d.a.a.a.a.b.b.a(:2)
W/System.err:     at d.a.a.a.a.e.<init>(Unknown Source:7)
W/System.err:     at c.b.a.j.a(:2)
W/System.err:     at c.b.a.j.<init>(Unknown Source:14)
W/System.err:     at c.b.a.d.onStarted(:1)
W/System.err:     at android.location.LocationManager$GnssStatusListenerTransport$GnssHandler.handleMessage(LocationManager.java:1424)
W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:106)
W/System.err:     at android.os.Looper.loop(Looper.java:164)
W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:6626)
W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
W/System.err:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:811)

I looked inside mqtt library and I found the source code that generates this error :

https://github.com/eclipse/paho.mqtt.java/blob/master/org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/logging/LoggerFactory.java

Line 76 :

    public static Logger getLogger(String messageCatalogName, String loggerID) {
        String loggerClassName = overrideloggerClassName;
        Logger logger = null;

        if (loggerClassName == null) {
            loggerClassName = jsr47LoggerClassName;
        }
        logger = getLogger(loggerClassName, 
        ResourceBundle.getBundle(messageCatalogName), loggerID, null) ;

        if (null == logger) {
                throw new MissingResourceException("Error locating the 
                                                    logging class", CLASS_NAME, loggerID);
        }
    return logger;
    }

if I add debuggable true in the release block in the file build.gradle I don't get the error and the app works fine. But I don't want a debuggable release.

Can you help me?

Answer 1

You can add the following lines to the proguard-rules.pro file:

-keep class org.eclipse.paho.clent.mqttv3.** {*;}
-keep class org.eclipse.paho.client.mqttv3.*$* { *; }
-keep class org.eclipse.paho.client.mqttv3.logging.JSR47Logger { *; }