import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.Locale;

import java.util.Set;

import javax.lang.model.SourceVersion;

import javax.lang.model.element.ElementKind;

import javax.lang.model.element.TypeElement;

import javax.lang.model.element.VariableElement;

import com.sun.source.doctree.DocCommentTree;

import com.sun.source.doctree.DocTree;

import com.sun.source.util.DocTrees;

import jdk.javadoc.doclet.Doclet;

import jdk.javadoc.doclet.Reporter;

import jdk.javadoc.doclet.DocletEnvironment;

public class BreakIteratorWarning implements Doclet {

        String[] argarray = {

            "-docletpath", System.getProperty("test.classes", "."),

            "-doclet", "BreakIteratorWarning",

            "-Xwerror",

            thisFile

        };

        if (jdk.javadoc.internal.tool.Main.execute(argarray) != 0)

    List<VariableElement> getFields(TypeElement klass) {

        List<VariableElement> fields = new ArrayList<>();

        klass.getEnclosedElements()

                .stream()

                .filter((e) -> (e.getKind() == ElementKind.FIELD))

                .forEach((e) -> { fields.add((VariableElement)e);});

        return fields;

    }

    public boolean run(DocletEnvironment root) {

        TypeElement cd = root.getIncludedClasses().iterator().next();

        VariableElement fd = getFields(cd).get(0);

        DocTrees docTrees = root.getDocTrees();

        DocCommentTree docCommentTree = docTrees.getDocCommentTree(fd);

        List<? extends DocTree> firstSentence = docCommentTree.getFirstSentence();

    @Override

    public String getName() {

        return "Test";

    }

    @Override

    public Set<Option> getSupportedOptions() {

        return Collections.emptySet();

    }

    @Override

    public SourceVersion getSupportedSourceVersion() {

        return SourceVersion.latest();

    }

    public void init(Locale locale, Reporter reporter) {

        return;

    }