* @throws IOException if any
     * @throws XmlPullParserException if any
     */
    Settings buildSettings() throws IOException, XmlPullParserException;

    /**
     * @param useCachedSettings if true, doesn't reload the user settings
     * @return a <code>Settings</code> object from the user settings file.
     * @throws IOException if any
     * @throws XmlPullParserException if any
     */

- extension artifact missing
- artifact metadata retrieval problem
- version range violation
- circular dependency
- artifact missing
- artifact retrieval exception
- md5 checksum doesn't match for local artifact, need to redownload this
- POM doesn't exist for a goal that requires one
- parent POM missing (in both the repository + relative path)
- component not found

Plugins:
- plugin metadata missing

  </parent>

  <artifactId>child</artifactId>

  <name>Maven Integration Test :: MNG-3979</name>
  <description>
    Test that during inheritance the merging/joining of subtrees with equal identifier doesn't crash if the parent
    POM has a non-empty element and the child POM has an empty element to join.
  </description>

  <properties/>

  <repositories>
    <repository>
      <id>equal-repo-id</id>

            version = constructVersion(repoMetadata.getVersioning(), artifact.getBaseVersion());
        }

        if (version == null) {
            // use the local copy, or if it doesn't exist - go to the remote repo for it
            version = artifact.getBaseVersion();
        }

        // TODO also do this logging for other metadata?
        // TODO figure out way to avoid duplicated message

        assertFalse(toolchain.matchesRequirements(Collections.singletonMap("name", "John Doe")));
        verify(logger).debug("Toolchain {} doesn't match required property: {}", toolchain, "name");
    }

    @Test
    void testEquals() {
        ToolchainModel tm1 = new ToolchainModel();
        tm1.setType("jdk");

                return false;
            }
            if (!matcher.matches(requirement.getValue())) {
                getLog().debug("Toolchain {} doesn't match required property: {}", this, key);
                return false;
            }
        }
        return true;
    }

    protected Logger getLog() {
        return logger;
    }

 *
 * As a non-default component this now gets a negative priority relative to other implementations
 * of the same interface. Since we want to allow overriding this doesn't matter in this case.
 * (if it did we could add @Priority of 0 to match the priority given to default components.)
 */
@Named
@Singleton
public class DefaultModelProcessor implements ModelProcessor {

            than specifying a value for finalName directly in the plugin configuration section. It is also useful to
            ensure that - for example - a List-typed parameter which expects items of type Artifact doesn't get a List
            full of Strings.
          </description>
        </field>
        <field>
          <name>description</name>
          <version>1.0.0+</version>
          <type>String</type>

            The frequency for downloading updates - can be
            {@code always},
            {@code daily} (default),
            {@code interval:XXX} (in minutes) or
            {@code never} (only if it doesn't exist locally).
          </description>
          <type>String</type>
        </field>
        <field>
          <name>checksumPolicy</name>
          <version>4.0.0+</version>
          <description>

        return result;
    }

    private static boolean policyEquals(RepositoryPolicy p1, RepositoryPolicy p2) {
        if (p1 == p2) {
            return true;
        }
        // update policy doesn't affect contents
        return p1.isEnabled() == p2.isEnabled() && Objects.equals(p1.getChecksumPolicy(), p2.getChecksumPolicy());
    }