Fix issue 97, 95, 93, 84, 39

[rahlk]

The Problem: The error seems to come from a unique situation wherein, mvnw is corrupt and therefore the dependencies are not downloaded. Then, when we use analysis level 2, WALA is unable to resolve any super classes of the two servlet classes.

The fix: First, we ensure that if ./mvnw is corrupt, then ensure we use mvn (which we weren't correctly doing); next, use makeWithRoot(...) to create WALA analysis scope which will assume all classes inherit from java.lang.Object.

This PR also creates a number of integration tests that uses TestContainers to emulate various usage scenarios of maven, gradle, etc. As requested in issue #84.

This PR also fixes issue #97 where we look recursively for jmods folder given JAVA_HOME:

  private static Path getJmodsPath() {
    try {
      try (Stream<Path> paths = Files.walk(Path.of(System.getenv("JAVA_HOME")), Integer.MAX_VALUE, FileVisitOption.FOLLOW_LINKS)) {
        return paths
                .filter(path -> path.getFileName().toString().equals("jmods"))
                .findFirst()
                .orElseThrow(() -> new RuntimeException("jmods directory not found in " + System.getenv("JAVA_HOME")));
      }
    } catch (IOException e) {
      throw new RuntimeException("Error searching for jmods directory", e);
    }
  }

[scottkurz]

The Problem: The error seems to come from a unique situation wherein, mvnw is corrupt and therefore the dependencies are not downloaded. Then, when we use analysis level 2, WALA is unable to resolve any super classes of the two servlet classes.

In reading #95, I noticed it says the problem occurs only when using mvn and goes away when mvnw is used.

[rahlk]

The Problem: The error seems to come from a unique situation wherein, mvnw is corrupt and therefore the dependencies are not downloaded. Then, when we use analysis level 2, WALA is unable to resolve any super classes of the two servlet classes.

In reading #95, I noticed it says the problem occurs only when using mvn and goes away when mvnw is used.

Yeah, either way if the dependencies are ignored WALA is looking for a javax.*.Servlet superclass which can't be found. So, using makeWithRoot will assume that if no superclass dependencies are found then assume (correctly so) that java.lang.Object is the superclass instead of failing.

[rofrano]

Looks good to me.