isValidDate fails with patterns ending with "yyyy"

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What steps will reproduce the problem?
1.Instantiate a DateFormat with "dd/MM/yyyy" pattern
2.Call isValidDate method with "01/01/2AAA" as date

What is the expected output? What do you see instead?
I expected to get a false as result, but i got a true

What version of the product are you using? On what operating system?
Version 2.0.1 tested on Windows XP and Solaris both of them with java 1.6.0_33

Does this issue affect only a specified browser or set of browsers?
No

Please provide any additional information below.

If I change the pattern to any other that don´t have "yyyy" at the end of the 
pattern i get a false as it´s expected.

Some examples:

      DateFormat df=new SimpleDateFormat("dd/MM/yyyy");      
      df.setLenient(true);
      System.out.println("Result:" + instance.isValidDate("Pruebas-", "01/01/2aaa", df, false));

Result:true

      df=new SimpleDateFormat("yyyy/dd/MM");      
      df.setLenient(true);
      System.out.println("Result:"  + instance.isValidDate("Pruebas-", "2aaa/01/01", df, false));

Result:false      

      df=new SimpleDateFormat("dd/yyyy/MM");      
      df.setLenient(true);
      System.out.println("Result:"  + instance.isValidDate("Pruebas-", "01/2012'SELECT * FROM user_table'/01", df, false));

Result:false

      df=new SimpleDateFormat("dd/MM/yyyy");      
      df.setLenient(true);
      System.out.println("Result:"  + instance.isValidDate("Pruebas-", "01/01/2012'SELECT * FROM user_table'", df, false));

Result:true     

      df=new SimpleDateFormat("dd/yyyy/MM");      
      df.setLenient(true);
      System.out.println("Result:"  + instance.isValidDate("Pruebas-", "01/2aaa/01", df, false));

Result:false

Original issue reported on code.google.com by fagu...@gmail.com on 14 Feb 2013 at 10:48