[Spring Security] SHA-512 , UserDetailService, User - authentication not working

[Vikas Kapoor]

	<beans:bean id="shaPasswordEncoder" class="org.springframework.security.providers.encoding.ShaPasswordEncoder">
    	<beans:constructor-arg value="512" />
	</beans:bean>
	
	<authentication-provider user-service-ref="myUserDetailsService">
		<password-encoder base64="false" ref="shaPasswordEncoder"></password-encoder>		
	</authentication-provider>

public UserDetails loadUserByUsername(String userName)throws UsernameNotFoundException, DataAccessException {
		
		logger.info("*************** UserDetailsServiceImpl :: loadUserByUsername ***************");
		
		List<Object[]> tblEmployeeList = new ArrayList<Object[]>();
		
		// I find and load the user by username in tblEmployeeList
		
		Object[] tblEmployee = (Object[])tblEmployeeList.get(0);
		Long employeeId = Long.parseLong(tblEmployee[0].toString());
		String password = tblEmployee[2].toString();
//		String password = new String((byte[])tblEmployee[2]);
		
		GrantedAuthority[] grantedAuthority = new GrantedAuthority[]{new GrantedAuthorityImpl("ROLE_USER")};
		MyUser myUser = new MyUser(userName,password,true,true,true,true,grantedAuthority);
		
		return myUser;		
	}

public class MyUser extends User {

	public MyUser(String username, String password, boolean enabled,boolean accountNonExpired, boolean credentialsNonExpired,
boolean accountNonLocked, GrantedAuthority[] authorities)	throws IllegalArgumentException {
		super(username, password, enabled, accountNonExpired, credentialsNonExpired,accountNonLocked, authorities);
	}
	
	// other properties
}

Initially I was using SHA-1 + base64 but now I am switched to SHA-512 and NO base64. SHA-512 returns byte[], so my question is Spring's User class constructor is designed to accept ONLY string as password and that is why I can not make user authentication working. The password in DB is stored as blob. DB is MySQL.

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