Sun.misc.base64decoder Jar |link| Download May 2026

If you are using , you should stop using sun.misc entirely. Java now provides a standard, high-performance, and officially supported Base64 utility. How to Switch: Old Code (sun.misc):

If you are running a legacy app on a new Java version (Java 9, 11, 17, or 21) and it crashes because it requires sun.misc.BASE64Decoder , you have two options:

byte[] decodedBytes = org.apache.commons.codec.binary.Base64.decodeBase64(encodedString); Use code with caution. 2. Google Guava sun.misc.base64decoder jar download

If you cannot change the source code, you can try adding this flag to your Java execution command to "open" the internal modules: --add-exports=java.base/sun.misc=ALL-UNNAMED

However, downloading a random JAR file from the internet is rarely the right solution. Here is everything you need to know about why this class is missing and how to fix it properly. 🛑 Why You Can’t Find the JAR If you are using , you should stop using sun

This is the industry standard for older Java versions. Add this dependency to your pom.xml :

If your project already uses Guava, it has built-in support: 🛑 Why You Can’t Find the JAR This

BASE64Decoder decoder = new BASE64Decoder(); byte[] decodedBytes = decoder.decodeBuffer(encodedString); Use code with caution.