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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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/**

 * @test

 * @bug     6330997 7025789 8000961

 * @summary javac should accept class files with major version of the next release

 * @author  Wei Tao

 * @clean T1 T2

 * @compile -source 8 -target 8 T1.java

 * @compile -source 8 -target 8 T2.java

 * @run main/othervm T6330997

 */

import java.nio.*;

import java.io.*;

import java.nio.channels.*;

import com.sun.tools.javac.api.JavacTaskImpl;

import com.sun.tools.javac.main.JavaCompiler;

import javax.tools.ToolProvider;

public class T6330997 {

    public static void main(String... args) {

        increaseMajor("T1.class", 1);

        increaseMajor("T2.class", 2);

        javax.tools.JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

        JavacTaskImpl task = (JavacTaskImpl)tool.getTask(null, null, null, null, null, null);

        JavaCompiler compiler = JavaCompiler.instance(task.getContext());

        try {

            compiler.resolveIdent("T1").complete();

        } catch (Exception e) {

            e.printStackTrace();

            throw new RuntimeException("Failed: unexpected exception while reading class T1");

        }

        try {

            compiler.resolveIdent("T2").complete();

        } catch (BadClassFile e) {

            System.err.println("Passed: expected completion failure " + e.getClass().getName());

            return;

        } catch (Exception e) {

            e.printStackTrace();

            throw new RuntimeException("Failed: unexpected exception while reading class T2");

        }

        throw new RuntimeException("Failed: no error reported");

    }

    // Increase class file cfile's major version by delta

    static void increaseMajor(String cfile, int delta) {

        try (RandomAccessFile cls =

             new RandomAccessFile(new File(System.getProperty("test.classes", "."), cfile), "rw");

             FileChannel fc = cls.getChannel()) {

            ByteBuffer rbuf = ByteBuffer.allocate(2);

            fc.read(rbuf, 6);

            ByteBuffer wbuf = ByteBuffer.allocate(2);

            wbuf.putShort(0, (short)(rbuf.getShort(0) + delta));

            fc.write(wbuf, 6);

            fc.force(false);

        } catch (Exception e){

            throw new RuntimeException("Failed: unexpected exception");

         }

     }

}