序列化/反序列化期间的java.io.invalidClassException [英] java.io.invalidClassException during serializing/deserializing
问题描述
我有一个对象可以读取和写入 fileinputstreams / objectinputstreams 和 objectinputstreams / objectoutputstreams 。我不断收到java错误的错误 serialversionUID ，但发现另一个错误。
I've got an object that im reading and writing to and from fileinputstreams/objectinputstreams and objectinputstreams/objectoutputstreams. I keep getting errors that java excpected one serialversionUID, but found another.
在我的课程中，我实现了 serializable ，并且有一个像这样的字段，最后一个很长serialVersionUID = 1L; 我觉得这已经足够了。
In my class I've implemented serializable and have a field like static final long serialVersionUID = 1L; which I thought was enough.
我是java序列化的新手。我在这里错过了什么？
I'm new to java serialization. What am I missing here?
编辑如果重要，我实际上是在尝试写一个 * * ArrayList< MyObject> **
EDIT If it matters, I'm actually trying to write and read an **ArrayList<MyObject>**
以下是完整的跟踪：
java.io.InvalidClassException: com.luxurymode.pojos.Reminder; Incompatible class (SUID): com.luxurymode.pojos.Reminder: static final long serialVersionUID =4209360273818925922L; but expected com.luxurymode.pojos.Reminder: static final long serialVersionUID =1L;
W/System.err( 4504): at java.io.ObjectInputStream.verifyAndInit(ObjectInputStream.java:2723)
W/System.err( 4504): at java.io.ObjectInputStream.readNewClassDesc(ObjectInputStream.java:1848)
W/System.err( 4504): at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:826)
W/System.err( 4504): at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:2066)
W/System.err( 4504): at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:929)
W/System.err( 4504): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2285)
W/System.err( 4504): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2240)
W/System.err( 4504): at java.util.ArrayList.readObject(ArrayList.java:662)
W/System.err( 4504): at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err( 4504): at java.lang.reflect.Method.invoke(Method.java:521)
W/System.err( 4504): at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1537)
W/System.err( 4504): at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1460)
W/System.err( 4504): at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:2139)
W/System.err( 4504): at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:929)
W/System.err( 4504): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2285)
W/System.err( 4504): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2240)
W/System.err( 4504): at com.luxurymode.singletons.RemindersSingleton.<init>(RemindersSingleton.java:54)
W/System.err( 4504): at com.luxurymode.singletons.RemindersSingleton.getInstance(RemindersSingleton.java:66)
W/System.err( 4504): at com.luxurymode.views.AddReminderView.saveAlarm(AddReminderView.java:290)
W/System.err( 4504): at com.luxurymode.tab_2.RemindersActivity.onClick(RemindersActivity.java:94)
W/System.err( 4504): at android.view.View.performClick(View.java:2554)
W/System.err( 4504): at android.view.View$PerformClick.run(View.java:8962)
W/System.err( 4504): at android.os.Handler.handleCallback(Handler.java:587)
W/System.err( 4504): at android.os.Handler.dispatchMessage(Handler.java:92)
W/System.err( 4504): at android.os.Looper.loop(Looper.java:123)
W/System.err( 4504): at android.app.ActivityThread.main(ActivityThread.java:4627)
W/System.err( 4504): at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err( 4504): at java.lang.reflect.Method.invoke(Method.java:521)
W/System.err( 4504): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
W/System.err( 4504): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
W/System.err( 4504): at dalvik.system.NativeStart.main(Native Method)
D/AndroidRuntime( 4504): Shutting down VM
推荐答案
你在读文件吗？在这种情况下，如果您现在添加serialVersionUID并不重要，它与文件中存储的不同，并且会产生异常。
Are you reading from a file? In that case, it does not matter if you added the serialVersionUID now, it is different from the one stored in the file, and that creates the exception.
快速解决方案可能是将serialVersionUID设置为4209360273818925922L，这似乎是当时在那个文件中保存那些对象时由java自动生成的serialVersionUID：）
A quick solution could be to set serialVersionUID to 4209360273818925922L, which seems to be the serialVersionUID that was automatically generated by java when you saved those object in that file at that time :)
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