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Java: @Override must override a superclass method

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The method XXXXXX   of type XXXXXXXXX must
override a superclass method
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1. window ->preferences... -> java -> Compiler
2. Compiler compliance level : 6.0
3.Apply
4. ok
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public class NodeBean implements Serializable
{
   
    private Object data; //ÔªËØ±¾Éí
    private NodeBean next; //ÏÂÒ»¸ö½Úµã
   
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Java jdbc Oracle error: ORA 12505

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