*
     * @return the collection of phases in Maven 3 compatible ordering
     */
    default Collection<Phase> v3phases() {
        return phases();
    }

    /**
     * Stream of phases containing all child phases recursively.
     *
     * @return a stream of all phases in this lifecycle, including nested phases
     */
    default Stream<Phase> allPhases() {
        return phases().stream().flatMap(Phase::allPhases);
    }

        DefaultAlias(String v3Phase, String v4Phase) {
            this.v3Phase = v3Phase;
            this.v4Phase = v4Phase;
        }

        @Override
        public String v3Phase() {
            return v3Phase;
        }

        @Override
        public String v4Phase() {
            return v4Phase;
        }
    }

        Map<String, String> aliases = lifecycle.getDelegate().aliases().stream()
                .collect(Collectors.toMap(a -> a.v3Phase(), a -> a.v4Phase()));

        if (aliases.containsKey(lifecyclePhase)) {
            lifecyclePhase = PhaseId.of(aliases.get(lifecyclePhase)).phase();
        }

        boolean passed = false;
        for (String phase : lifecycle.getPhases()) {
            boolean include = true;

        Map<String, LifecyclePhase> lphases = getLifecyclePhases();
        if (lphases == null) {
            return null;
        }

        if (lphases.isEmpty()) {
            return Collections.emptyMap();
        }

        Map<String, String> phases = new LinkedHashMap<>();
        for (Map.Entry<String, LifecyclePhase> e : lphases.entrySet()) {
            phases.put(e.getKey(), e.getValue().toString());
        }

        this.id = id;
    } // -- void setId( String )

    /**
     * Set the phase mappings for this lifecycle.
     *
     * @param phases a phases object.
     */
    public void setPhases(java.util.List<Phase> phases) {
        this.phases = phases;
    } // -- void setPhases( java.util.List )

     */
    BEFORE("before:"),
    /**
     * Execution is the execution of the phase proper. Failure of any {@code #AT} dynamic phase execution will fail
     * the phase. Any {@link #AFTER} phases will still be executed.
     */
    AT(""),
    /**
     * Guaranteed execution dynamic phases on completion of the static phase. All {@code #AFTER} dynamic phases will

        if (lifecyclePhases.isEmpty()) {
            return Collections.emptyMap();
        }

        Map<String, String> phases = new LinkedHashMap<>();
        for (Map.Entry<String, LifecyclePhase> e : lifecyclePhases.entrySet()) {
            phases.put(e.getKey(), e.getValue().toString());
        }
        return phases;
    }

                    }

                    @Override
                    public List<Phase> phases() {
                        return Collections.emptyList();
                    }

                    @Override
                    public Stream<Phase> allPhases() {
                        return Stream.concat(Stream.of(this), phases().stream().flatMap(Phase::allPhases));
                    }
                })

We have a lifecycle mapping for the packaging of *jar* below. You see that for this packaging we have a *default* lifecycle and a list of phases where each phase is a comma separated list of goals to run and they are in the form groupId:artifactId:version.

<configuration>
  <lifecycles>
    <lifecycle>
      <id>default</id>
      <phases>
        <process-resources>org.apache.maven.plugins:maven-resources-plugin:resources</process-resources>

                    Map<String, LifecyclePhase> phases = getLifecyclePhases(lifecycleId);
                    if (phases != null) {
                        Lifecycle lifecycle = new Lifecycle();

                        lifecycle.setId(lifecycleId);
                        lifecycle.setLifecyclePhases(phases);

                        lifecycleMap.put(lifecycleId, lifecycle);
                    }