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TIOBE - Java Coding Standard

Rule:  Design40Checked automatically with code checker

Synopsis:Static java.text.Format objects should be accessed in a synchronized manner
Severity Level:2

Instances of java.text.Format are generally not synchronized. Sun recommends using 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(); // poor, no thread-safety
    synchronized void foo() {
        sdf.format(); // preferred