On a Debian GNU/Linux version 11.0 Bullseye it is required to install the default-jdk package, to have the javac compiler.

A Java project generally uses several libraries; you can find lines like this into the .java sources:

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

If you don't download and install the proper .jar archives, you will get errors like the following when executing the javac compiler:

./org/vmax/amba/cfg/FirmwareConfig.java:3:
    error: package com.fasterxml.jackson.annotation does not exist
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

Each library may exists on the internet in several versions: it may be an hard work to guess which exact version was used by the developer for each one. You can use several internet repositories to search and download the archives you need, we suggest at least jar-download.com, repo1.maven.org and www.java2s.com.

It is advisable to create a directory which will contains all the libraries (downloaded as .jar archives) required by your project, that directory should be placed at the root level of your Java project.

└─ java-project/
   ├─ lib/
   │  ├─ apache-commons-net.jar
   │  ├─ commons-math3-3.0.jar
   │  ├─ ...
   │  └─ slf4j.jar
   └─ org/
      └─ vmax/
         ├─ amba/
         │  ├─ bitrate/
         │  ├─ ...
         │  ├─ AppMain.java
         │  ├─ ...
         │  └─ Utils.java
         └─ midrive/

$CLASSPATH

find . -name '*.class' | xargs -r rm
find . -name '*.java' > sources.txt
javac --class-path $CLASSPATH @sources.txt

$CLASSES

echo 'Main-Class: org.vmax.amba.AppMain' > manifest.txt
echo "Class-Path: $CLASSES" >> manifest.txt
 
jar --create --verbose \
    --file='firmware-editor-tool.jar' \
    --main-class='org.vmax.amba.AppMain' \
    --manifest='manifest.txt' \
    $(find . -type f -name '*.class')