sky_star

**Is your feature request related to a problem? Please describe.** A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] **Describe the solution you'd...

## Question

jvm

1

**jvm调优能不能在多讲一些具体的调优步骤，最好可以举例说明，这样就完美了。 哈哈哈**

Class cannot be created (missing no-arg constructor): com.persistence.IterablePersistenceEntry

3

**com.esotericsoftware.kryo.KryoException: Class cannot be created (missing no-arg constructor): com.hivemq.persistence.IterablePersistenceEntry at com.esotericsoftware.kryo.util.DefaultInstantiatorStrategy.newInstantiatorOf(DefaultInstantiatorStrategy.java:111) at com.esotericsoftware.kryo.Kryo.newInstantiator(Kryo.java:1190) at com.esotericsoftware.kryo.Kryo.newInstance(Kryo.java:1199) at com.esotericsoftware.kryo.serializers.FieldSerializer.create(FieldSerializer.java:163) at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:122) at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:880) at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:235) at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:42) at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:777) at com.hivemq.util.KryoUtil.readObject(KryoUtil.java:35) com.esotericsoftware.kryo.KryoException:...