範例

public void doGet(HttpServletRequest req, HttpServletResponse resp) {

HttpSession session = req.getSession(true);
session.setAttribute(ATTRIB_NAME, new NonSerializableData());
// ...
}
public class NonSerializableData {
// ...
}

private static final String ATTRIB_NAME = "badExample";

解決方案
請讓物件實作 java.io.Serializable,使欄位成為 transient,或不將物件儲存在 HttpSession 中。

public void doGet(HttpServletRequest req, HttpServletResponse resp) {

HttpSession session = req.getSession(true);
session.setAttribute(ATTRIB_NAME, new SerializableData());
// ...
}
public class NonSerializableData implements java.io.Serializable {
static final long serialVersionUID = -817083988410801866L;
// ...
}

private static final String ATTRIB_NAME = "badExample";