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当我将 ObjectInputStream 与 IBM JDK7 一起使用时，出现了异常：

java.io.StreamCorruptedException: invalid type code: F1
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1712)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2397)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2277)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2179)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1684)
at java.io.ObjectInputStream.readObjectImpl(ObjectInputStream.java:531)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:466)

但是，当我使用 IBM 的 JDK6 或 oracle 的 JDK 运行代码时，一切正常！问题出在哪里？一些代码如：</p> 

String str = "";
ObjectInputStream in = null;
String hStr = "0123456789ABCDEF";
ByteArrayOutputStream baos = new ByteArrayOutputStream(str.length() / 2);
for (int i = 0; i < str.length(); i += 2) {
    baos.write((hStr.indexOf(str.charAt(i)) << 4 | hStr.indexOf(str.charAt(i + 1))));
}
byte[] bytes = baos.toByteArray();
in = new ObjectInputStream(new ByteArrayInputStream(bytes));
in.readObject();//this line Throws ”StreamCorruptedException: invalid type code: F1“
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