akash-queuebuster opened a new issue, #1311:
URL: https://github.com/apache/logging-log4j2/issues/1311

   ## Description
   
   When I implemented the StrLookup in my Lookup then in runtime classpath 
couldn't find StrLookup inteface. My guess is that it's due to reflection, the 
interface is available at compile time but couldn't include in build so it's 
unavailable at runtime.
   
   ## Configuration
   
   **Version:** 2.3 | 2.17.2 | 2.19.0
   
   **Operating system:** Android 11
   
   **JDK:** Embedded JDK Version 11.0.15
   
   ## Logs
   
   ```
   java.lang.NoClassDefFoundError: Failed resolution of: 
Lorg/apache/logging/log4j/core/lookup/StrLookup;
       at 
com.example.application.local_log.AndroidLog4jHelper.initialise(AndroidLog4jHelper.java:36)
       at 
com.example.application.my_app.app.MainApplication.setupLog4J(MainApplication.java:329)
       at 
com.example.application.my_app.app.MainApplication.onCreate(MainApplication.java:323)
       at 
android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1192)
       at 
android.app.ActivityThread.handleBindApplication(ActivityThread.java:7593)
       at android.app.ActivityThread.access$1500(ActivityThread.java:301)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2177)
       at android.os.Handler.dispatchMessage(Handler.java:106)
       at android.os.Looper.loop(Looper.java:246)
       at android.app.ActivityThread.main(ActivityThread.java:8653)
       at java.lang.reflect.Method.invoke(Native Method)
       at 
com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
   Caused by: java.lang.ClassNotFoundException: Didn't find class 
"org.apache.logging.log4j.core.lookup.StrLookup" on path: DexPathList[[zip file 
"/data/app/~~xPUZykkWQAbNPadqT4Iamw==/com.dpdtech.application.mpos-q2_T3J_MHK2KX_sdSlYhjw==/base.apk"],nativeLibraryDirectories=[/data/app/~~xPUZykkWQAbNPadqT4Iamw==/com.dpdtech.application.mpos-q2_T3J_MHK2KX_sdSlYhjw==/lib/arm64,
 
/data/app/~~xPUZykkWQAbNPadqT4Iamw==/com.dpdtech.application.mpos-q2_T3J_MHK2KX_sdSlYhjw==/base.apk!/lib/arm64-v8a,
 /system/lib64]]
       at 
dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:207)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
       at 
com.dpdtech.application.local_log.AndroidLog4jHelper.initialise(AndroidLog4jHelper.java:36)
 
       at 
com.example.application.my_app.app.MainApplication.setupLog4J(MainApplication.java:329)
 
       at 
com.example.application.my_app.app.MainApplication.onCreate(MainApplication.java:323)
 
       at 
android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1192) 
       at 
android.app.ActivityThread.handleBindApplication(ActivityThread.java:7593) 
       at android.app.ActivityThread.access$1500(ActivityThread.java:301) 
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2177) 
       at android.os.Handler.dispatchMessage(Handler.java:106) 
       at android.os.Looper.loop(Looper.java:246) 
       at android.app.ActivityThread.main(ActivityThread.java:8653) 
       at java.lang.reflect.Method.invoke(Native Method) 
       at 
com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
 
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130) 
   ```
   
   ## Reproduction
   
   you can reproduce it just pull this code and run it 
(https://github.com/roman-mityukov/log4j2-android)
   


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