java.lang.RuntimeException: The root object can neither be an abstract class nor interface: "[J

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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)

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