This line from the logs is the clue you are looking for:
17:17:58 WARN: Bytecode of dependencies was not provided for analysis of source files, you might end up with less precise results. Bytecode can be provided using sonar.java.libraries property.
To solve this problem (and avoid others), you should definitely consider using the scanner for maven that I linked in my previous post.
If not possible, you should make sure the project is correctly configured, by setting sonar.java.libraries property.
sonar.java.libraries: Comma-separated paths to files with third-party libraries (JAR or Zip files) used by your project.
You can have a look there for a similar problem.
Hope this helps,
Quentin