java.lang.NoSuchMethodError: org.json.JSONObject.putOnce(Ljava/lang/String;Ljava/lang/Object;)Lorg/json/JSONObject;

Question

I have faced an Error

java.lang.NoSuchMethodError

org.json.JSONObject.putOnce(Ljava/lang/String;Ljava/lang/Object;)Lorg/json/JSONObject; at org.json.JSONWriter.key(JSONWriter.java:208) at com.google.firebase.database.util.JsonMapper.serializeJsonValue(JsonMapper.java:76) at com.google.firebase.database.util.JsonMapper.serializeJsonValue(JsonMapper.java:61) at com.google.firebase.database.util.JsonMapper.serializeJson(JsonMapper.java:41) at com.google.firebase.database.util.GAuthToken.serializeToString(GAuthToken.java:67) at com.google.firebase.database.core.JvmAuthTokenProvider.wrapOAuthToken(JvmAuthTokenProvider.java:86) at com.google.firebase.database.core.JvmAuthTokenProvider.getToken(JvmAuthTokenProvider.java:66) at com.google.firebase.database.core.Context$1.getToken(Context.java:62) at com.google.firebase.database.connection.PersistentConnectionImpl$1.run(PersistentConnectionImpl.java:490) at com.google.firebase.database.connection.util.RetryHelper$1.run(RetryHelper.java:93) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at jav a.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)

Answer 1

It seems there is a common dependency conflict when using Firebase's Admin SDK and Spring. The discussion is here , and possible solution can be found here .

I have test the solution and it works but I am checking about possible side effects.

Answer 2

According to java documentation :

"NoSuchMethodError" Thrown if an application tries to call a specified method of a class (either static or instance), and that class no longer has a definition of that method.

So, look at the stack trace:

• If the exception appears when youre calling a method from library - you have not included its jar in build.
• If it happens when youre calling your own method - make sure the class files that you are actually running are updated when you compile

But first of all - try to clean and build (clean install in mvn)