|  | @@ -24,7 +24,7 @@ public class DateUtil {
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				|  |  |      private static final String DATE_FORMAT = "yyyy-MM-dd";
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				|  |  |      private static final String DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
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				|  |  |  
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				|  |  | -    private static ThreadLocal<Map<String, DateFormat>> dateFormatThreadLocal = new ThreadLocal<Map<String, DateFormat>>();
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				|  |  | +    private static final ThreadLocal<Map<String, DateFormat>> dateFormatThreadLocal = new ThreadLocal<Map<String, DateFormat>>();
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				|  |  |      private static DateFormat getDateFormat(String pattern) {
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				|  |  |          if (pattern==null || pattern.trim().length()==0) {
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				|  |  |              throw new IllegalArgumentException("pattern cannot be empty.");
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