Compile all the java sources to class file - Java javax.tools

Java examples for javax.tools:JavaCompiler

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Description

Compile all the java sources to class file

Demo Code

/*/*from   ww w .  jav  a2 s.co  m*/
     * Copyright (c) 2015, 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.
     *
     * 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.
     */
import javax.tools.JavaCompiler;
import javax.tools.StandardJavaFileManager;
import javax.tools.StandardLocation;
import javax.tools.ToolProvider;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

public class Main{
    /**
         * Compile all the java sources in {@code <source>/**} to
         * {@code <destination>/**}. The destination directory will be created if
         * it doesn't exist.
         *
         * All warnings/errors emitted by the compiler are output to System.out/err.
         *
         * @return true if the compilation is successful
         *
         * @throws IOException if there is an I/O error scanning the source tree or
         *                     creating the destination directory
         */
        public static boolean compile(Path source, Path destination, String ... options)
    throws IOException
{
    JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
    StandardJavaFileManager jfm = compiler.getStandardFileManager(null, null, null);

    List<Path> sources
        = Files.find(source, Integer.MAX_VALUE,
            (file, attrs) -> (file.toString().endsWith(".java")))
            .collect(Collectors.toList());

    Files.createDirectories(destination);
    jfm.setLocation(StandardLocation.CLASS_PATH, Collections.EMPTY_LIST);
    jfm.setLocationFromPaths(StandardLocation.CLASS_OUTPUT,
                             Arrays.asList(destination));

    List<String> opts = Arrays.asList(options);
    JavaCompiler.CompilationTask task
        = compiler.getTask(null, jfm, null, opts, null,
            jfm.getJavaFileObjectsFromPaths(sources));

    return task.call();
}
}

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