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UnsynchronizedStaticDateFormatter

UnsynchronizedStaticDateFormatter

SimpleDateFormat instances are 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.
This rule is defined by the following Java class: net.sourceforge.pmd.lang.java.rule.design.UnsynchronizedStaticDateFormatterRule
Example(s):


    
public class Foo {
    private static final SimpleDateFormat sdf = new SimpleDateFormat();
    void bar() {
        sdf.format(); // poor, no thread-safety
    }
    synchronized void foo() {
        sdf.format(); // preferred
    }
}