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class里明明有这种方法，却产生这种错误。
如果方法真的没有，错误信息却是No method named "getSqel" was found
sun公司的对NoSuchMethodError的解释是这样的：
Thrown if an application tries to call a specified method of a class (either static or instance), and that class no longer has a definition of that method.
Normally, this error is caught by the compiler;
this error can only occur at run time if the definition of a class has incompatibly changed.
如果方法真的没有，错误信息却是No method named "getSqel" was found
sun公司的对NoSuchMethodError的解释是这样的：
Thrown if an application tries to call a specified method of a class (either static or instance), and that class no longer has a definition of that method.
Normally, this error is caught by the compiler;
this error can only occur at run time if the definition of a class has incompatibly changed.