Install libopenjpa-java by entering the following commands in the terminal:
sudo apt update sudo apt install libopenjpa-java
Java Persistence 2.0 API (JPA) implementation library
OpenJPA is Apache's implementation of Sun's Java Persistence 2.0 API (JSR-317 JPA 2.0) specification for the transparent persistence of Java objects. . It is an object-relational mapping (ORM) solution for the Java language, which simplifies storing objects in databases.