Java example source code file (InnerClassCannotBeVerified.java)

This example Java source code file (InnerClassCannotBeVerified.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

assertionerror, constantpoolexception, exception, file, foo, innerclasscannotbeverified, javacompiler, javactask, javasource, net, network, override\\n, simplejavafileobject, string, test, the, util

The InnerClassCannotBeVerified.java Java example source code

/*
 * Copyright (c) 2012, 2013, 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.
 */

/*
 * @test
 * @bug 7199823
 * @summary javac generates inner class that can't be verified
 * @run main InnerClassCannotBeVerified
 */

import java.util.Arrays;
import javax.tools.JavaFileObject;
import java.net.URI;
import javax.tools.SimpleJavaFileObject;
import javax.tools.ToolProvider;
import javax.tools.JavaCompiler;
import com.sun.source.util.JavacTask;
import com.sun.tools.classfile.ClassFile;
import com.sun.tools.classfile.ConstantPoolException;
import java.io.File;
import java.io.IOException;

public class InnerClassCannotBeVerified {

    private static final String errorMessage =
            "Compile error while compiling the following source:\n";

    public static void main(String... args) throws Exception {
        new InnerClassCannotBeVerified().run();
    }

    void run() throws Exception {
        JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
        JavaSource source = new JavaSource();
        JavacTask ct = (JavacTask)comp.getTask(null, null, null,
                null, null, Arrays.asList(source));
        try {
            if (!ct.call()) {
                throw new AssertionError(errorMessage +
                        source.getCharContent(true));
            }
        } catch (Throwable ex) {
            throw new AssertionError(errorMessage +
                    source.getCharContent(true));
        }
        check();
    }

    private void check() throws IOException, ConstantPoolException {
        File file = new File("Test$1.class");
        ClassFile classFile = ClassFile.read(file);
        boolean inheritsFromObject =
                classFile.getSuperclassName().equals("java/lang/Object");
        boolean implementsNoInterface = classFile.interfaces.length == 0;
        boolean noMethods = classFile.methods.length == 0;
        if (!(inheritsFromObject &&
              implementsNoInterface &&
              noMethods)) {
            throw new AssertionError("The inner classes reused as " +
                    "access constructor tag for this code must be empty");
        }
    }

    class JavaSource extends SimpleJavaFileObject {

        String internalSource =
                              "public class Test {\n" +
                              "    private static class Foo {}\n" +
                              "    public static void main(String[] args){ \n" +
                              "        new Foo();\n" +
                              "        if(false) {\n" +
                              "            new Runnable() {\n" +
                              "                @Override\n" +
                              "                public void run() {\n" +
                              "                    System.out.println();\n" +
                              "                }\n" +
                              "            }.run();\n" +
                              "        }\n" +
                              "   }\n" +
                              "}";
        public JavaSource() {
            super(URI.create("Test.java"), JavaFileObject.Kind.SOURCE);
        }

        @Override
        public CharSequence getCharContent(boolean ignoreEncodingErrors) {
            return internalSource;
        }
    }
}