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TIOBE - Java Coding Standard

Rule:  Design40Checked automatically with code checker

Synopsis:Static DateFormatter objects should be accessed in a synchronized manner
Severity Level:2

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