父/子序列化本地類不兼容異常

Question

我從下面的兩個類中收到序列化兼容性錯誤。 僅父類CommericalCustomer實現序列化。 當我具有下面的父/子關系時，使用可序列化接口的正確方法是什么？

public class CachedCommercialCustomers extends CommercialCustomer {


}

public class CommercialCustomer implements Serializable {

    private static final long serialVersionUID = 1L;

}

例外：

[#|2013-01-02T05:01:02.553-0800|SEVERE|glassfish3.1.2|com.hazelcast.nio.AbstractSerializer|_ThreadID=10;_ThreadName=Thread-2;|spot.api.model.vo.backoffice.CachedCommercialCustomers; local class incompatible: stream classdesc serialVersionUID = -2672531984245897526, local class serialVersionUID = -743225273062282831
java.io.InvalidClassException: com.sample.CachedCommercialCustomers; local class incompatible: stream classdesc serialVersionUID = -2672531984245897526, local class serialVersionUID = -743225273062282831
        at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:579)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1600)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1513)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1749)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
        at java.io.ObjectInputStream.readUnshared(ObjectInputStream.java:458)
        at com.hazelcast.nio.DefaultSerializer$ObjectSerializer.readNormal(DefaultSerializer.java:383)
        at com.hazelcast.nio.DefaultSerializer$ObjectSerializer.read(DefaultSerializer.java:353)
        at com.hazelcast.nio.DefaultSerializer.read(DefaultSerializer.java:134)
        at com.hazelcast.nio.CustomSerializerAdapter.read(CustomSerializerAdapter.java:33)
        at com.hazelcast.nio.AbstractSerializer.toObject(AbstractSerializer.java:116)
        at com.hazelcast.nio.AbstractSerializer.toObject(AbstractSerializer.java:146)
        at com.hazelcast.nio.Serializer.readObject(Serializer.java:72)
        at com.hazelcast.impl.ThreadContext.toObject(ThreadContext.java:103)
        at com.hazelcast.nio.IOUtil.toObject(IOUtil.java:149)
        at com.hazelcast.impl.BaseManager$RequestBasedCall.getResultAsObject(BaseManager.java:384)
        at com.hazelcast.impl.BaseManager$ResponseQueueCall.getResultAsObject(BaseManager.java:455)
        at com.hazelcast.impl.BaseManager$RequestBasedCall.getResultAsObject(BaseManager.java:368)
        at com.hazelcast.impl.BaseManager$ResponseQueueCall.getResultAsObject(BaseManager.java:455)

Answer 1

這里的問題是您沒有為子類指定serialVersionId因此java會代您生成一個。 如果更改Java源文件，則簡單的重新編譯可能會更改此值。 參見規格 。

當代碼更改時我會更改的事實是一件好事，但在某些情況下，它將使您感到有些悲傷:)

請參閱此處以獲取更多信息以及如何在必要時“解決”問題。