1 /*

     2  * Copyright 2004 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 

    25 /* Testcase that does a defineClass with a NULL name on HelloWorld.class */

    26 

    27 import java.io.*;

    28 

    29 public class DefineClass extends ClassLoader {

    30     public static void main(String args[]) {

    31         DefineClass t = new DefineClass();

    32         t.run(args);

    33     }

    34     public void run(String args[]) {

    35         Class n;

    36         byte b[] = new byte[10000];

    37         int len = 0;

    38         String cdir;

    39         String cfile;

    40 

    41         /* Class is found here: */

    42         cdir = System.getProperty("test.classes", ".");

    43         cfile = cdir + java.io.File.separator + "HelloWorld.class";

    44 

    45         try {

    46             /* Construct byte array with complete class image in it. */

    47             FileInputStream fis = new FileInputStream(cfile);

    48             int nbytes;

    49             do {

    50                 nbytes = fis.read(b, len, b.length-len);

    51                 if ( nbytes > 0 ) {

    52                     len += nbytes;

    53                 }

    54             } while ( nbytes > 0 );

    55         } catch ( Throwable x ) {

    56             System.err.println("Cannot find " + cfile);

    57             x.printStackTrace();

    58         }

    59 

    60         /* Define the class with null for the name */

    61         n = defineClass(null, b, 0, len);

    62 

    63         /* Try to create an instance of it */

    64         try {

    65             n.newInstance();

    66         } catch ( Throwable x ) {

    67             x.printStackTrace();

    68         }

    69     }

    70 }