Pattern: Static Matcher field
Issue: -
Matcher objects should not be used as static fields. Calendars are inherently unsafe for multi-threaded use. Sharing a single instance across thread boundaries without proper synchronization will result in erratic behavior of the application.
Example of violations:
// two violations
class SomeClass {
static Matcher matcher1
static java.util.regex.Matcher matcher2
}
// these usages are OK
class SomeCorrectClass {
private Matcher matcher1
static ThreadLocal<Matcher> matcher2
}