test/jdk/javax/imageio/SetOutput.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 *
 * 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).
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 * 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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/*
 * @test
 * @bug 4414455
 * @summary Checks for NPE from ImageWriter.setOutput when the writer has no
 *          originating service provider
 * @modules java.desktop/com.sun.imageio.plugins.png
 */

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;

import javax.imageio.ImageIO;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;

import com.sun.imageio.plugins.png.PNGImageWriter;

public class SetOutput {

    public static void main(String[] args) throws IOException {
        ImageWriter iw = new PNGImageWriter(null);
        File f = File.createTempFile("imageio", "tmp");
        try (ImageOutputStream ios = ImageIO.createImageOutputStream(f)) {
            iw.setOutput(ios);
        } finally {
            Files.delete(f.toPath());
        }
    }
}