File > Project Structure > Modules > Dependencies > + > JARs or Directories.
The Apache Commons Project Distributions provide .zip or .tar.gz packages containing the JAR, source code, and documentation. Step-by-Step: Adding Base64 to Your Project 1. Using Maven download org.apache.commons.codec.binary.base64
commons-codec commons-codec 1.22.0 Use code with caution. 2. Using Gradle Add this line to your build.gradle file: implementation 'commons-codec:commons-codec:1.22.0' Use code with caution. 3. Manual Installation (IDE) If you are not using a build tool, follow these steps: the commons-codec-1.22.0.jar from Maven Central . Move the file to a lib folder in your project. Configure Classpath: File > Project Structure > Modules > Dependencies
Add the dependency to your pom.xml to have Maven handle the download automatically. Using Maven commons-codec commons-codec 1
Include the following block in your pom.xml . As of early 2026, version is the latest stable release.
Why java unknown: import org.apache.commons.codec.binary.Base64