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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.
/*
* Copyright (c) 1999, 2020, 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
* questions.
*/
package com.sun.tools.javac;
import java.io.PrintWriter;
/**
* A legacy programmatic interface for the Java Programming Language
* compiler, javac.
* See the {@code jdk.compiler}
* module for details on replacement APIs.
*/
public class Main {
/**
* Do not call.
*/
@Deprecated()
public Main(){}
/** Main entry point for the launcher.
* Note: This method calls System.exit.
* @param args command line arguments
* @throws Exception only if an uncaught internal exception occurs;
* just retained for historical compatibility
*/
public static void main(String[] args) throws Exception {
System.exit(compile(args));
}
/** Programmatic interface to the Java Programming Language
* compiler, javac.
*
* @param args The command line arguments that would normally be
* passed to the javac program as described in the man page.
* @return an integer equivalent to the exit value from invoking
* javac, see the man page for details.
*/
public static int compile(String[] args) {
com.sun.tools.javac.main.Main compiler =
new com.sun.tools.javac.main.Main("javac");
return compiler.compile(args).exitCode;
}
/** Programmatic interface to the Java Programming Language
* compiler, javac.
*
* @param args The command line arguments that would normally be
* passed to the javac program as described in the man page.
* @param out PrintWriter to which the compiler's diagnostic
* output is directed.
* @return an integer equivalent to the exit value from invoking
* javac, see the man page for details.
*/
public static int compile(String[] args, PrintWriter out) {
com.sun.tools.javac.main.Main compiler =
new com.sun.tools.javac.main.Main("javac", out);
return compiler.compile(args).exitCode;
}
}