private final StringBuilder buffer = new StringBuilder();
    private final AbstractStyledTextOutput original;
    private Node current;
    private Prefixer prefixer = new DefaultPrefixer();

    public TreeFormatter() {
        this.original = new AbstractStyledTextOutput() {
            @Override
            protected void doAppend(String text) {
                buffer.append(text);
            }

Class <org.gradle.internal.logging.text.TreeFormatter$1> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (TreeFormatter.java:0)
Class <org.gradle.internal.logging.text.TreeFormatter$DefaultPrefixer> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (TreeFormatter.java:0)