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warning UnsynchronizedStaticDateFormatter (PMD)

Static DateFormatter objects should be accessed in a synchronized manner

SimpleDateFormat is not synchronized. Sun recomends separate format instances for each thread. If multiple threads must access a static formatter, the formatter must be synchronized either on method or block level.

    
public class Foo {
    private static final SimpleDateFormat sdf = new SimpleDateFormat();
    void bar() {
        sdf.format(); // bad
    }
    synchronized void foo() {
        sdf.format(); // good
    }
}
    
      

Additional info can be found at this http://pmd.sourceforge.net/rules/design.html#UnsynchronizedStaticDateFormatter site.