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The root object can neither be an abstract class nor interface: "[J
java.lang.RuntimeException: The root object can neither be an abstract class nor interface: "[J at io.protostuff.runtime.RuntimeSchema.createFrom(RuntimeSchema.java:210) at io.protostuff.runtime.RuntimeSchema.createFrom(RuntimeSchema.java:187) at io.protostuff.runtime.IdStrategy.newSchema(IdStrategy.java:116) at io.protostuff.runtime.DefaultIdStrategy$Lazy.getSchema(DefaultIdStrategy.java:708) at io.protostuff.runtime.RuntimeSchema.getSchema(RuntimeSchema.java:149) at io.protostuff.runtime.RuntimeSchema.getSchema(RuntimeSchema.java:140) at kryo.demo.UserCompareKryoAndProtostuff.testProtostuff(UserCompareKryoAndProtostuff.java:66) at kryo.demo.UserCompareKryoAndProtostuff.main(UserCompareKryoAndProtostuff.java:31) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)