徽章

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icon location Beijing icon location A funny? software engineer, currently focusing on the backend.

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SimpleREST return "Internal Server Error"

The reson is ``` java.lang.NoSuchMethodError: com.fasterxml.jackson.core.JsonGenerator.writeStartObject(Ljava/lang/Object;)V at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:630) at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:33) at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480) at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319) at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:2656) at com.fasterxml.jackson.core.base.GeneratorBase.writeObject(GeneratorBase.java:355) at io.vertx.core.json.JsonObjectSerializer.serialize(JsonObjectSerializer.java:22) at io.vertx.core.json.JsonObjectSerializer.serialize(JsonObjectSerializer.java:19) at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:119) at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:79) at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:18) at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480)...

Only 1 datanode is running after start the cluster

You need to change **docker-compose.yml** file. Watch [this](https://gist.github.com/themonster2015/35cf4252893cdcc831e79e76deb95cdb)