: Starting with Java 9 and the Java Platform Module System (JPMS) , access to these internal packages was strictly shut off. Relying on it causes your code to break when moving to newer Java versions. Where to Find the JAR (The Legacy Path)
If you are searching for a , you are likely encountering a NoClassDefFoundError or an IDE access restriction in a Java project. : Starting with Java 9 and the Java
This specific class is an that was historically bundled with the JDK but is not meant for public use. Below is a guide on where it comes from, why you shouldn't "download" it as a standalone JAR, and what to use instead. Understanding the Class This specific class is an that was historically
If you must maintain a legacy application and cannot refactor the code yet, you can find this class in the following locations: Base64.java - GitHub : Starting with Java 9 and the Java
: The com.sun.* prefix indicates it is an internal implementation detail of the Sun/Oracle JDK.