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"nb-javac" is a patched version of OpenJDK "javac", i.e., the Java compiler. This has long been part of NetBeans, providing a highly tuned Java compiler specifically for the Java editor i.e., parsing and lexing for features such as syntax coloring, code completion.

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/*
 * Copyright (c) 2006, 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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 *
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package javax.tools;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;

/**
 * Provides an easy way to collect diagnostics in a list.
 *
 * @param  the type of source objects used by diagnostics received
 * by this object
 *
 * @author Peter von der Ahé
 * @since 1.6
 */
public final class DiagnosticCollector implements DiagnosticListener {
    private List> diagnostics =
            Collections.synchronizedList(new ArrayList>());

    /**
     * Creates a new instance of DiagnosticCollector.
     */
    public DiagnosticCollector() {}

    public void report(Diagnostic diagnostic) {
        Objects.requireNonNull(diagnostic);
        diagnostics.add(diagnostic);
    }

    /**
     * Returns a list view of diagnostics collected by this object.
     *
     * @return a list view of diagnostics
     */
    public List> getDiagnostics() {
        return Collections.unmodifiableList(diagnostics);
    }
}