Error on class sun.security.pkcs11.SunPKCS11

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Java

I have made keyStore in java1.4 using this code.

public static void main(String[] args )
      throws IOException, DocumentException, GeneralSecurityException {
String pkcs11Config = "name=eToken\nlibrary=C://WINDOWS//system32//eTPKCS11.dll";
java.io.ByteArrayInputStream pkcs11ConfigStream = new java.io.ByteArrayInputStream(pkcs11Config.getBytes());
sun.security.pkcs11.SunPKCS11 providerPKCS11 = new   sun.security.pkcs11.SunPKCS11(pkcs11ConfigStream);
java.security.Security.addProvider(providerPKCS11);

// Get provider KeyStore and login with PIN
String pin = "123456";
 java.security.KeyStore keyStore =java.security.KeyStore.getInstance("PKCS11", providerPKCS11);
keyStore.load(null, pin.toCharArray());

// Enumerate items (certificates and private keys) in the KeyStore
java.util.Enumeration<String> aliases = keyStore.aliases();
String alias=null;
while (aliases.hasMoreElements()) {
 alias = aliases.nextElement();
System.out.println(alias);

 }} 

But I have get an error

Error(2,28): cannot access class sun.security.pkcs11.SunPKCS11; class file has wrong version 49.0, should be 45.3 or 46.0 or 47.0 or 48.0`

Please Tell me the solution. How can I download the class of version below 49 like 48 etc.