*
   * <ul>
   *   <li>{@code null} initial state, nothing has happened.
   *   <li>{@link Cancellation} terminal state, {@code cancel} was called.
   *   <li>{@link Failure} terminal state, {@code setException} was called.
   *   <li>{@link DelegatingToFuture} intermediate state, {@code setFuture} was called.
   *   <li>{@link #NULL} terminal state, {@code set(null)} was called.

                            problems.add(new ModelProblemCollectorRequest(Severity.ERROR, Version.BASE)
                                    .setMessage(e.getMessage())
                                    .setException(e));
                        }
                        cache.put(value, c);
                    }
                    return c;
                }
                return value;
            }
        };

   *
   * <ul>
   *   <li>{@code null} initial state, nothing has happened.
   *   <li>{@link Cancellation} terminal state, {@code cancel} was called.
   *   <li>{@link Failure} terminal state, {@code setException} was called.
   *   <li>{@link DelegatingToFuture} intermediate state, {@code setFuture} was called.
   *   <li>{@link #NULL} terminal state, {@code set(null)} was called.

    @CanIgnoreReturnValue
    public boolean set(@Nullable V newValue) {
      return futureValue.set(newValue);
    }

    @CanIgnoreReturnValue
    public boolean setException(Throwable t) {
      return futureValue.setException(t);
    }

    private ListenableFuture<V> fullyFailedFuture(Throwable t) {
      return immediateFailedFuture(t);
    }

    @Override

pull.XmlSerializer); public void startElement(String); public void addAttribute(String, String); public void writeText(String); public void writeMarkup(String); public void endElement(); private void storeException(java.io.IOException); public java.util.List getExceptions(); } org/codehaus/plexus/util/xml/XMLWriter.class package org.codehaus.plexus.util.xml; public abstract interface XMLWriter { public abstract void startElement(String); public abstract void addAttribute(String, String); public abstract void writeText(String);...