Access restriction: The type BASE64Encoder is not accessible due to restriction


Downloaded a Java sample from Alexa API on Amazon service, imports it into Eclipse, but unable to compile and hits following “Access restriction” errors :

Access restriction: The type BASE64Encoder is not accessible due to restriction 
on required library 

P.S Using JDK 1.6 and Eclipse IDE 4.2

import sun.misc.BASE64Encoder; // Access restriction error 
   result = new BASE64Encoder().encode(rawHmac);


Using sun.* package should be avoided, read this statement.

If you insist want to use sun.misc.BASE64Encoder, in Eclipse, right click on the project, properties -> Java compiler –> Errors/Warnings –> Deprecated and restricted API –> Forbidden reference (access rules), change the default “Error” to “Warning“. Now, your code should be able to compile, but with some warning messages.


The above solution is not recommended, you should replace sun.misc.BASE64Encoder with other BASE64 class like Apache common codec.

import org.apache.commons.codec.binary.Base64;
    result = new Base64().encodeToString(rawHmac);


  1. Alexa Web Information Service
  2. Apache common codec
  3. Why Developers Should Not Write Programs That Call ‘sun’ Packages
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  • Brandon

    Thanks for the tip. Who would have thought it was as easy as changing from “Error” to “Warning”. Are there any warning during runtime or only during compilation?

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  • Mudassir Shahzad

    You are the man! BASE64Encoder is a great tool :)
    Thanks for sharing

  • Frisian

    Base64 encoding and decoding is part of the JDK since Java 6:
    No need to use the sun classes anymore.

    • Mudassir Shahzad

      Frisian, The only problem that I have with java jdk’s base64 encoding api is that it is licensed.