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There is a newer version: 8.10.0.38194

Not all classes in the standard Java library were written to be thread-safe. Using them in a multi-threaded manner is highly likely to cause data problems or exceptions at runtime.
This rule raises an issue when an instance of Calendar, DateFormat, javax.xml.xpath.XPath, or javax.xml.validation.SchemaFactory is marked static.

Noncompliant Code Example
public class MyClass {
  static private SimpleDateFormat format = new SimpleDateFormat("HH-mm-ss");  // Noncompliant
  static private Calendar calendar = Calendar.getInstance();  // Noncompliant


Compliant Solution
public class MyClass {
  private SimpleDateFormat format = new SimpleDateFormat("HH-mm-ss");
  private Calendar calendar = Calendar.getInstance();