Install libpulse-java by entering the following commands in the terminal:
sudo apt update sudo apt install libpulse-java
Description:
PulseAudio sound driver for Java
IcedTea implementation of javax.sound.sampled.spi.MixerProvider using PulseAudio as a mixer.
Homepage: http://icedtea.classpath.org
Version: 2.4.7-1
Section: universe/java