How to load .java source code instead of .class file using soot

[skyleaworlder]

😭 I would like to use .java file to do static analysis work. But I was only able to access tutorial or support about "how to load class file" online.

When soot is used as a CLI-tool, I know its usage, such as:

java -cp sootclasses-trunk-jar-with-dependencies.jar soot.Main \
     -cp PATH/src/main/java -pp demo.example.A -src-prec J -f jimple

However, I failed to find some instructions about how to load .java file, when soot is used as Compiler-Framework.