import sun misc BASE64Encoder results in error compiled in Eclipse

Question

For this two imports   import sun misc BASE64Encoder  import sun misc BASE64Decoder    I got this error   Access restriction  The type BASE64Decoder is not accessible due to restriction on required library C  Program Files Java jre6 lib rt jar   How can I resolve this error

User · Answer

I am using unix system    In eclipse project-  Properties -  Java Compiler -  Errors Warning -  Forbidden Access access rule  -  Turn it to warning Ignore Previously it was set to Error

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This error  or warning in later versions  occurs because you are compiling against a Java Execution Environment  This shows up as JRE System library  CDC-1 0 Foundation-1 0  in the Build path of your Eclipse Java project  Such environments only expose the Java standard API instead of all the classes within the runtime  This means that the classes used to implement the Java standard API are not exposed   You can allow access to these particular classes using access rules  you could configure Eclipse to use the JDK directly or you could disable the error  You would however be hiding a serious error as Sun internal classes shouldn t be used  see below for a short explanation      Java contains a Base64 class in the standard API since Java 1 8  See below for an example how to use it   Java 8 import statement   import java util Base64    Java 8 example code      create a byte array containing data  test  byte   binaryData   new byte     0x64  0x61  0x74  0x61       create and configure encoder  using method chaining   Base64 Encoder base64Encoder   Base64 getEncoder   withoutPadding       encode to string  instead of a byte array containing ASCII  String base64EncodedData   base64Encoder encodeToString binaryData       decode using a single statement  no reuse of decoder     NOTE the decoder won t fail because the padding is missing byte   base64DecodedData   Base64 getDecoder   decode base64EncodedData       If Java 8 is not available a library such as Apache Commons Codec or Guava should be used     Sun internal classes shouldn t be used  Those classes are used to implement Java  They have got public methods to allow instantiation from other packages  A good build environment however should protect you from using them   Using internal classes may break compatibility with future Java SE runtimes  the implementation and location of these classes can change at any time  It should be strongly discouraged to disable the error or warning  but the disabling of the error is suggested in previous answers  including the two top voted ones

User · Answer

I know this is very Old post  Since we don t have any thing sun misc in maven  we can easily use   StringUtils newStringUtf8 Base64 encodeBase64 encVal    From org apache commons codec binary Base64

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Yup  and sun misc BASE64Decoder is way slower  9x slower than java xml bind DatatypeConverter parseBase64Binary   and 4x slower than org apache commons codec binary Base64 decodeBase64    at least for a small string on Java 6 OSX   Below is the test program I used  With Java 1 6 0 43 on OSX   john password   am9objpwYXNzd29yZA   javax xml took 373  john password apache took    612  john password sun took       2215  john password   Btw that s with commons-codec 1 4  With 1 7 it seems to get slower   javax xml took 377  john password apache took    1681  john password sun took       2197  john password   Didn t test Java 7 or other OS   import javax xml bind DatatypeConverter  import org apache commons codec binary Base64  import java io IOException   public class TestBase64       private static volatile String save   null      public static void main String argv              String teststr    john password           String b64   DatatypeConverter printBase64Binary teststr getBytes             System out println teststr           b64           try               final int COUNT   1000000              long start              start   System currentTimeMillis                for  int i 0  i lt COUNT    i                    save   new String DatatypeConverter parseBase64Binary b64                              System out println  javax xml took    System currentTimeMillis  -start       save               start   System currentTimeMillis                for  int i 0  i lt COUNT    i                    save   new String Base64 decodeBase64 b64                              System out println  apache took       System currentTimeMillis  -start       save               sun misc BASE64Decoder dec   new sun misc BASE64Decoder                start   System currentTimeMillis                for  int i 0  i lt COUNT    i                    save   new String dec decodeBuffer b64                              System out println  sun took          System currentTimeMillis  -start       save             catch  Exception e                System out println e

User · Answer

Be careful  sun misc BASE64Decoder is not available in JDK-13

User · Answer

Sure - just don t use the Sun base64 encoder decoder  There are plenty of other options available  including Apache Codec or this public domain implementation   Then read why you shouldn t use sun   packages

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I had this problem on jdk1 6 0 37  This is the only JDE JRE on my system  I don t know why  but the following solved the problem      Project -  Properties -  Java Build Path -   Libraries      Switch radio button from Execution environment to Alernate JRE     This selects the same jdk1 6 0 37  but after clean build the compile error disappeared    Maybe clarification in answer from  ram  Mar 16 at 9 00  has to do something with that

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Java 6 ships the javax xml bind DatatypeConverter  This class provides two static methods that support the same decoding  amp  encoding   parseBase64Binary     printBase64Binary    Update  Since Java 8 we now have a much better Base64 Support   Use this and you will not need an extra library  like Apache Commons Codec

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Go to Window-- Preferences-- Java-- Compiler-- Error Warnings  Select Deprecated and Restricted API  Change it to warning  Change forbidden and Discouraged Reference and change it to warning   or as your need

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Go to the Build Path settings in the project properties  Remove the JRE System Library Add it back  Select  Add Library  and select the JRE System Library  The default worked for me    This works because you have multiple classes in different jar files  Removing and re-adding the jre lib will make the right classes be first  If you want a fundamental solution make sure you exclude the jar files with the same classes

User · Answer

This error is because of you are importing below two classes import sun misc BASE64Encoder  import sun misc BASE64Decoder   Maybe you are using encode and decode of that library like below   new BASE64Encoder   encode encVal   newBASE64Decoder   decodeBuffer encryptedData     Yeah instead of sun misc BASE64Encoder you can import  java util Base64 class Now change the previous encode method as below   encryptedData Base64 getEncoder   encodeToString encryptedByteArray     Now change the previous decode method as below  byte   base64DecodedData   Base64 getDecoder   decode base64EncodedData     Now everything is done   you can save your program and run  It will run without showing any error

User · Answer

That error is caused by your Eclipse configuration  You can reduce it to a warning  Better still  use a Base64 encoder that isn t part of a non-public API  Apache Commons has one  or when you re already on Java 1 8  then use java util Base64

User · Answer

Add base64decoder jar and try these imports   import Decoder BASE64Decoder  import Decoder BASE64Encoder

[java] import sun.misc.BASE64Encoder results in error compiled in Eclipse

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