if (groupId == null && model.getParent() != null) {
            groupId = model.getParent().getGroupId();
        }
        return groupId;
    }

    private String getVersion(Model model) {
        String version = model.getVersion();
        if (version == null && model.getParent() != null) {
            version = model.getParent().getVersion();
        }
        return version;
    }

    }

    @Override
    public Path getRootDirectory() {
        return project.getRootDirectory();
    }

    @Override
    public Optional<Project> getParent() {
        MavenProject parent = project.getParent();
        return parent != null ? Optional.of(session.getProject(parent)) : Optional.empty();
    }

    @Nonnull

                    }
                }
                try {
                    Files.delete(artifactPath);
                    Files.delete(artifactPath.getParent());
                    Files.delete(artifactPath.getParent().getParent());
                } catch (DirectoryNotEmptyException e) {
                    // ignore
                }
            }
        } catch (IOException e) {

        // load everything...
        MavenProject project0 = getProjectWithDependencies(pom0);
        MavenProject project1 = getProjectWithDependencies(pom1);

        assertEquals(pom0Basedir, project1.getParent().getBasedir());
        Set set = project1.getArtifacts();
        assertNotNull(set, "No artifacts");
        assertTrue(set.size() > 0, "No Artifacts");

        for (Object aSet : set) {

String) throws NoSuchRealmException; public abstract void addConstituent(java.net.URL); public abstract ClassRealm locateSourceRealm(String); public abstract void setParent(ClassRealm); public abstract ClassRealm createChildRealm(String) throws DuplicateRealmExcept; public abstract ClassLoader getClassLoader(); public abstract ClassRealm getParent(); public abstract java.net.URL[] getConstituents(); public abstract Class loadClass(String) throws ClassNotFoundExcepti; public abstract java.net.URL getResource(String);...

                artifactRequest = (ArtifactRequest) data;
            } else if (data instanceof Plugin) {
                plugin = (Plugin) data;
            }
            trace = trace.getParent();
        }

        Path trackingDir;
        boolean missing = event.getFile() == null;
        if (missing) {
            // missing artifact - let's track the path anyway

        String groupId = m.getGroupId();
        if (groupId == null && m.getParent() != null) {
            groupId = m.getParent().getGroupId();
        }

        String version = m.getVersion();
        if (version == null && m.getParent() != null) {
            version = m.getParent().getVersion();
        }

        return new RelativeProject(groupId, m.getArtifactId(), version);
    }

        // load everything...
        MavenProject project0 = getProjectWithDependencies(pom0);
        MavenProject project1 = getProjectWithDependencies(pom1);

        assertEquals(pom0Basedir, project1.getParent().getBasedir());
        System.out.println("Project " + project1.getId() + " " + project1);
        Set set = project1.getArtifacts();
        assertNotNull(set, "No artifacts");

String) throws NoSuchRealmException; public abstract void addConstituent(java.net.URL); public abstract ClassRealm locateSourceRealm(String); public abstract void setParent(ClassRealm); public abstract ClassRealm createChildRealm(String) throws DuplicateRealmExcept; public abstract ClassLoader getClassLoader(); public abstract ClassRealm getParent(); public abstract java.net.URL[] getConstituents(); public abstract Class loadClass(String) throws ClassNotFoundExcepti; public abstract java.net.URL getResource(String);...

        this.foreignImports = foreignImports;
        this.constituents = constituents;
    }

    public RealmType getType() {
        return type;
    }

    public ClassLoader getParent() {
        return parent;
    }

    public List<String> getImports() {
        return getParentImports();
    }

    public List<String> getParentImports() {
        return parentImports;
    }