1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
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  23 
  24 /**
  25  * @test
  26  * @bug     6330997 7025789
  27  * @summary javac should accept class files with major version of the next release
  28  * @author  Wei Tao
  29  * @clean T1 T2
  30  * @compile -target 8 T1.java
  31  * @compile -target 8 T2.java
  32  * @run main/othervm T6330997
  33  */
  34 
  35 import java.nio.*;
  36 import java.io.*;
  37 import java.nio.channels.*;
  38 import com.sun.tools.javac.api.JavacTaskImpl;
  39 import com.sun.tools.javac.jvm.ClassReader.BadClassFile;
  40 import com.sun.tools.javac.main.JavaCompiler;
  41 import javax.tools.ToolProvider;
  42 
  43 public class T6330997 {
  44     public static void main(String... args) {
  45         increaseMajor("T1.class", 1);
  46         increaseMajor("T2.class", 2);
  47         javax.tools.JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
  48         JavacTaskImpl task = (JavacTaskImpl)tool.getTask(null, null, null, null, null, null);
  49         JavaCompiler compiler = JavaCompiler.instance(task.getContext());
  50         try {
  51             compiler.resolveIdent("T1").complete();
  52         } catch (Exception e) {
  53             e.printStackTrace();
  54             throw new RuntimeException("Failed: unexpected exception while reading class T1");
  55         }
  56         try {
  57             compiler.resolveIdent("T2").complete();
  58         } catch (BadClassFile e) {
  59             System.err.println("Passed: expected completion failure " + e.getClass().getName());
  60             return;
  61         } catch (Exception e) {
  62             e.printStackTrace();
  63             throw new RuntimeException("Failed: unexpected exception while reading class T2");
  64         }
  65         throw new RuntimeException("Failed: no error reported");
  66     }
  67 
  68     // Increase class file cfile's major version by delta
  69     static void increaseMajor(String cfile, int delta) {
  70         try {
  71             RandomAccessFile cls = new RandomAccessFile(
  72                     new File(System.getProperty("test.classes", "."), cfile), "rw");
  73             FileChannel fc = cls.getChannel();
  74             ByteBuffer rbuf = ByteBuffer.allocate(2);
  75             fc.read(rbuf, 6);
  76             ByteBuffer wbuf = ByteBuffer.allocate(2);
  77             wbuf.putShort(0, (short)(rbuf.getShort(0) + delta));
  78             fc.write(wbuf, 6);
  79             fc.force(false);
  80             cls.close();
  81          } catch (Exception e){
  82             e.printStackTrace();
  83             throw new RuntimeException("Failed: unexpected exception");
  84          }
  85      }
  86 }