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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, 2014, 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 com.sun.source.tree;

import java.util.List;

/**
 * A tree node for a {@code try} statement.
 *
 * For example:
 *  *   try
 *       block
 *   catches
 *   finally
 *       finallyBlock
 * 
 *
 * @jls 14.20 The try statement
 *
 * @author Peter von der Ahé
 * @author Jonathan Gibbons
 * @since 1.6
 */
public interface TryTree extends StatementTree {
    /**
     * Returns the block of the {@code try} statement.
     * @return the block
     */
    BlockTree getBlock();

    /**
     * Returns any catch blocks provided in the {@code try} statement.
     * The result will be an empty list if there are no
     * catch blocks.
     * @return the catch blocks
     */
    List getCatches();

    /**
     * Returns the finally block provided in the {@code try} statement,
     * or {@code null} if there is none.
     * @return the finally block
     */
    BlockTree getFinallyBlock();


    /**
     * Returns any resource declarations provided in the {@code try} statement.
     * The result will be an empty list if there are no
     * resource declarations.
     * @return the resource declarations
     */
    List getResources();
}