mvvmfx/src/main/java/de/saxsys/mvvmfx/internal/viewloader/JavaViewLoader.java
<ViewModelType extends ViewModel> void callInitialize(View<? extends ViewModelType> view) {
        try {
            final Method initializeMethod = view.getClass().getMethod(NAMING_CONVENTION_INITIALIZE_IDENTIFIER);

            AccessController.doPrivileged((PrivilegedAction) () -> {
                try {
                    return initializeMethod.invoke(view);
                } catch (InvocationTargetException e) {
                    LOG.warn("The '{}' method of the view {} has thrown an exception!",
                            NAMING_CONVENTION_INITIALIZE_IDENTIFIER, view);

                    Throwable cause = e.getCause();
                    if (cause instanceof RuntimeException) {
                        throw (RuntimeException) cause;
                    } else {
                        throw new RuntimeException(cause);
                    }
                } catch (IllegalAccessException e) {
                    LOG.warn("Can't invoke the '{}' method of the view {} because it is not accessible",
                            NAMING_CONVENTION_INITIALIZE_IDENTIFIER, view);
                }
                return null;
            });

        } catch (NoSuchMethodException e) {
            // This exception means that there is no initialize method declared.
            // While it's possible that the user has no such method by design,
            // normally and in most cases you need an initialize method in your
            // view (either with Initialize interface
            // or implicit).
            // So it's likely that the user has misspelled the method name or
            // uses a wrong naming convention.
            // For this reason we give the user the log message.
            LOG.debug("There is no '{}' method declared at the view {}", NAMING_CONVENTION_INITIALIZE_IDENTIFIER, view);
        }
    }
<ViewModelType extends ViewModel> void callInitialize(View<? extends ViewModelType> view) {
        try {
            final Method initializeMethod = view.getClass().getMethod(NAMING_CONVENTION_INITIALIZE_IDENTIFIER);

            AccessController.doPrivileged((PrivilegedAction) () -> {
                try {
                    return initializeMethod.invoke(view);
                } catch (InvocationTargetException e) {
                    LOG.warn("The '{}' method of the view {} has thrown an exception!",
                            NAMING_CONVENTION_INITIALIZE_IDENTIFIER, view);

                    Throwable cause = e.getCause();
                    if (cause instanceof RuntimeException) {
                        throw (RuntimeException) cause;
                    } else {
                        throw new RuntimeException(cause);
                    }
                } catch (IllegalAccessException e) {
                    LOG.warn("Can't invoke the '{}' method of the view {} because it is not accessible",
                            NAMING_CONVENTION_INITIALIZE_IDENTIFIER, view);
                }
                return null;
            });

        } catch (NoSuchMethodException e) {
            // This exception means that there is no initialize method declared.
            // While it's possible that the user has no such method by design,
            // normally and in most cases you need an initialize method in your
            // view (either with Initialize interface
            // or implicit).
            // So it's likely that the user has misspelled the method name or
            // uses a wrong naming convention.
            // For this reason we give the user the log message.
            LOG.debug("There is no '{}' method declared at the view {}", NAMING_CONVENTION_INITIALIZE_IDENTIFIER, view);
        }
    }
This method is trying to invoke the initialize method of the given view
by reflection. This is done to meet the conventions of the
{@link javafx.fxml.FXMLLoader}. The conventions say that when there is a
<strong>public</strong> no-args method with the simple name "initialize"
and the class does not implement the {@link javafx.fxml.Initializable}
interface, the initialize method will be invoked. <br>
This method is package scoped for better testability.

@param view
the view instance of which the initialize method will be
invoked.
@param <ViewModelType>
the generic type of the view.