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class Action extends ActionSupport
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{
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  public String execute()
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  throws Exception {
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    Result result = service.someMethod();
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    if(result != null) {
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      List<String> errors = ResultUtil.translate(result);
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      if(errors != null && errors.size() > 0)
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      iferrors != null && errors () > 0)
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      if(result.isSuccessful())
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        return SUCCESS;
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    }
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    return ERROR;
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  }
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}