InvalidKeySpecException

This exception thrown for invalid key specifications.

For Example in the below program, I tried to generate specification for DES key, using PBEKeySpec, which is invalid.

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;

public class InvalidKeySpecExceptionEx {
    public static void main(String args[]) throws InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException {
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        
        KeyGenerator keyGen = KeyGenerator.getInstance("DES");
        SecretKey key = keyGen.generateKey();
        
        PBEKeySpec spec = new  PBEKeySpec(new char[] {'a'});
        
        KeySpec specification = keyFactory.getKeySpec(key, spec.getClass());
  
    }
}

When tries to run the above program, below error thrown.

Exception in thread "main" java.security.spec.InvalidKeySpecException: Inappropriate key specification
 at com.sun.crypto.provider.DESKeyFactory.engineGetKeySpec(DESKeyFactory.java:113)
 at javax.crypto.SecretKeyFactory.getKeySpec(SecretKeyFactory.java:380)
 at InvalidKeySpecExceptionEx.main(InvalidKeySpecExceptionEx.java:19)
Java Result: 1

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