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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) 2019, 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,
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package jdk.internal;

import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

/**
 * Indicates the API declaration in question is associated with a
 * preview feature. See JEP 12: "Preview Language and VM
 * Features" (http://openjdk.java.net/jeps/12).
 *
 * Note this internal annotation is handled specially by the javac compiler.
 * To work properly with {@code --release older-release}, it requires special
 * handling in {@code make/langtools/src/classes/build/tools/symbolgenerator/CreateSymbols.java}
 * and {@code src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/ClassReader.java}.
 *
 * @since 14
 */
// Match the meaningful targets of java.lang.Deprecated, omit local
// variables and parameter declarations
@Target({java.lang.annotation.ElementType.METHOD,
         java.lang.annotation.ElementType.CONSTRUCTOR,
         java.lang.annotation.ElementType.FIELD,
         java.lang.annotation.ElementType.PACKAGE,
         java.lang.annotation.ElementType.TYPE})
 // CLASS retention will hopefully be sufficient for the purposes at hand
@Retention(RetentionPolicy.CLASS)
// *Not* @Documented
public @interface PreviewFeature {
    /**
     * Name of the preview feature the annotated API is associated
     * with.
     */
    public Feature feature();

    public boolean reflective() default false;

    public enum Feature {
        SWITCH_PATTERN_MATCHING,
        /**
         * A key for testing.
         */
        TEST,
        ;
    }
}