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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) 2005, 2022, 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,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
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 */

package javax.lang.model.type;

import java.util.ArrayList;
import java.util.List;
import java.util.Collections;
import java.io.ObjectInputStream;
import java.io.IOException;
import javax.lang.model.element.Element;


/**
 * Thrown when an application attempts to access a sequence of {@link
 * Class} objects each corresponding to a {@link TypeMirror}.
 *
 * @see MirroredTypeException
 * @see Element#getAnnotation(Class)
 * @since 1.6
 */
public class MirroredTypesException extends RuntimeException {

    private static final long serialVersionUID = 269;

    transient List types; // cannot be serialized

    /*
     * Trusted constructor to be called by MirroredTypeException.
     */
    MirroredTypesException(String message, TypeMirror type) {
        super(message);
        List tmp = (new ArrayList<>());
        tmp.add(type);
        types = Collections.unmodifiableList(tmp);
    }

    /**
     * Constructs a new MirroredTypesException for the specified types.
     *
     * @param types  the types being accessed
     */
    public MirroredTypesException(List types) {
        super("Attempt to access Class objects for TypeMirrors " +
              (types = // defensive copy
               new ArrayList<>(types)).toString() );
        this.types = Collections.unmodifiableList(types);
    }

    /**
     * Returns the type mirrors corresponding to the types being accessed.
     * The type mirrors may be unavailable if this exception has been
     * serialized and then read back in.
     *
     * @return the type mirrors in construction order, or {@code null} if unavailable
     */
    public List getTypeMirrors() {
        return types;
    }

    /**
     * Explicitly set all transient fields.
     * @param s the serial stream
     * @throws ClassNotFoundException for a missing class during
     * deserialization
     * @throws IOException for an IO problem during deserialization
     */
    private void readObject(ObjectInputStream s)
        throws IOException, ClassNotFoundException {
        s.defaultReadObject();
        types = null;
    }
}