First of all, you should download a Java development kit (JDK), containing the Java virtual machine (JVM) and other resources for developing Java applications. Since LITIENGINE has been created with Java 8, you need at least JDK 8 on your machine.
The official Oracle JDK has seen some severe licensing changes in 2019, requiring a paid license for developing commercial applications!
Here is a short overview over some entirely free JDK distributions:
|AdoptOpenJDK||JDK 8, JDK 11, JDK 15|
|Amazon Correto||JDK 8, JDK 11, JDK 15|
|Oracle Open JDK||JDK 15|
|Red Hat OpenJDK||JDK 8, JDK 11, JDK 15|