The jasperreports-extensions-3.5.3.jar includes:
There are several legitimate and safe methods to download this JAR file. Avoid random “JAR download” websites—they often contain outdated or malicious files. Below are the recommended approaches.
The extensions JAR is missing from the classpath. Solution: Verify that jasperreports-extensions-3.5.3.jar is correctly added.
javac -cp ".;lib/*" YourReportApp.java java -cp ".;lib/*" YourReportApp
If you have downloaded the JAR but the application server cannot find it:
If you are not using a build tool and need the physical file to place in your WEB-INF/lib or classpath, you can find it in public artifact repositories.