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   * 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
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  /**
   * Provides interfaces for tools which can be invoked from a program,
   * for example, compilers.
   *
   * <p>These interfaces and classes are required as part of the
   * Java Platform, Standard Edition (Java SE),
   * but there is no requirement to provide any tools implementing them.
   *
   * <p>Unless explicitly allowed, all methods in this package might
   * throw a {@link java.lang.NullPointerException} if given a
   * {@code null} argument or if given a
   * {@linkplain java.lang.Iterable list or collection} containing
   * {@code null} elements.  Similarly, no method may return
   * {@code null} unless explicitly allowed.
   *
   * <p>This package is the home of the Java programming language compiler framework.
   * This framework allows clients of the framework to locate and run
   * compilers from programs.  The framework also provides Service
   * Provider Interfaces (SPI) for structured access to diagnostics
   * ({@link jdkx.tools.DiagnosticListener}) as well as a file
   * abstraction for overriding file access ({@link
   * jdkx.tools.JavaFileManager} and {@link
   * jdkx.tools.JavaFileObject}).  See {@link
   * jdkx.tools.JavaCompiler} for more details on using the SPI.
   *
   * <p>There is no requirement for a compiler at runtime.  However, if
   * a default compiler is provided, it can be located using the
   * {@link jdkx.tools.ToolProvider}, for example:
   *
   * <p>{@code JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();}
   *
   * <p>It is possible to provide alternative compilers or tools
   * through the {@linkplain java.util.ServiceLoader service provider
   * mechanism}.
   *
   * <p>For example, if {@code com.vendor.VendorJavaCompiler} is a
   * provider of the {@code JavaCompiler} tool then its jar file
   * would contain the file {@code
   * META-INF/services/jdkx.tools.JavaCompiler}.  This file would
   * contain the single line:
   *
   * <p>{@code com.vendor.VendorJavaCompiler}
   *
   * <p>If the jar file is on the class path, VendorJavaCompiler can be
   * located using code like this:
   *
   * <p>{@code JavaCompiler compiler = ServiceLoader.load(JavaCompiler.class).iterator().next();}
   *
   * @author Peter von der Ah&eacute;
   * @author Jonathan Gibbons
   * @since 1.6
   */
  package jdkx.tools;
  