langtools/test/tools/javac/lambda/LambdaLambdaSerialized.java

/*
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 * 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.
 *
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 * questions.
 */

/*
@test
@bug 8010010
@summary NPE generating serializedLambdaName for nested lambda
*/

import java.io.*;
import java.util.Map;
import java.util.HashMap;

public class LambdaLambdaSerialized {

    static int assertionCount = 0;

    static void assertTrue(boolean cond) {
        assertionCount++;
        if (!cond)
            throw new AssertionError();
    }

    public static void main(String[] args) throws Exception {
        try {
            // Write lambdas out
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(baos);
            LSI<LSI<Map>> ssi = () -> (() -> new HashMap());
            write(out, ssi );
            out.flush();
            out.close();

            // Read them back
            ByteArrayInputStream bais =
                new ByteArrayInputStream(baos.toByteArray());
            ObjectInputStream in = new ObjectInputStream(bais);
            readAssert(in, "[X]");
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
            throw e;
        }
    }

    static void write(ObjectOutput out, LSI<LSI<Map>> lamb) throws IOException {
        out.writeObject(lamb);
    }

    static void readAssert(ObjectInputStream in, String expected)  throws IOException, ClassNotFoundException {
        LSI<LSI<Map>> ls = (LSI<LSI<Map>>) in.readObject();
        Map result = ls.get().get();
        System.out.printf("Result: %s\n", result);
    }
}

interface LSI<T> extends Serializable {
    T get();
}