.setLevel(Level.ERROR)
                .setMessage(new SimpleMessage("test message 1"))
                .build();

        LogEvent event2 = Log4jLogEvent.newBuilder()
                .setLoggerName("another.logger.sub")
                .setLevel(Level.ERROR)
                .setMessage(new SimpleMessage("test message 2"))
                .build();

                            .setMessage("Malformed POM " + modelSource.getLocation() + ": " + e.getMessage())
                            .setException(e));
                } else {
                    problems.add(new ModelProblemCollectorRequest(Severity.WARNING, Version.V20)
                            .setMessage("Malformed POM " + modelSource.getLocation() + ": " + e.getMessage())
                            .setException(e));

        assertEquals(3, events.size());
        assertEquals("error 1", events.get(0).getMessage());
        assertEquals("error 2", events.get(1).getMessage());
        assertEquals("error 3", events.get(2).getMessage());
    }

    @Test
    public void test_append_warnAppender_errorEvent() {

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

            } catch (RuntimeException e) {
                problems.add(new ModelProblemCollectorRequest(Severity.ERROR, Version.BASE)
                        .setMessage(
                                "Failed to determine activation for profile " + profile.getId() + ": " + e.getMessage())
                        .setLocation(profile.getLocation(""))
                        .setException(e));
                return false;
            }

                msg += " Please use ${" + newPrefix + expression.substring(bannedPrefix.length()) + "} instead.";
            }
            problems.add(new ModelProblemCollectorRequest(Severity.WARNING, Version.V20).setMessage(msg));
        }

        return value;
    }

    @Override
    public List getFeedback() {
        return valueSource.getFeedback();
    }

    @Override
    public void clearFeedback() {

        if (version == null || version.length() <= 0) {
            problems.add(new ModelProblemCollectorRequest(Severity.ERROR, Version.BASE)
                    .setMessage("Failed to determine Java version for profile " + profile.getId())
                    .setLocation(activation.getLocation("jdk")));
            return false;
        }

        if (jdk.startsWith("!")) {

            name = name.substring(1);
        }

        if (name == null || name.length() <= 0) {
            problems.add(new ModelProblemCollectorRequest(Severity.ERROR, Version.BASE)
                    .setMessage("The property name is required to activate the profile " + profile.getId())
                    .setLocation(property.getLocation("")));
            return false;
        }

        } catch (InterpolationException e) {
            problems.add(new ModelProblemCollectorRequest(Severity.ERROR, Version.BASE)
                    .setMessage("Failed to interpolate file location " + path + " for profile " + profile.getId() + ": "
                            + e.getMessage())
                    .setLocation(file.getLocation(missing ? "missing" : "exists"))
                    .setException(e));
            return false;

            // in favor of classical reporting section MSITE-647 / MSITE-684
            problems.add(new ModelProblemCollectorRequest(Severity.WARNING, Version.BASE)
                    .setMessage("Reporting configuration should be done in <reporting> section, "
                            + "not in maven-site-plugin <configuration> as reportPlugins parameter.")