Apache Batik No WriteAdapter is available? - svg

Question

I'm writing code to convert SVG's to PNG's:
package com.example;
import java.io.*;
import java.nio.file.Paths;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.apache.batik.transcoder.SVGAbstractTranscoder;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
public class Main {
public static void main(String [] args) throws Exception {
// read the input SVG document into TranscoderInput
String svgURI = Paths.get(args[0]).toUri().toURL().toString();
TranscoderInput input = new TranscoderInput(svgURI);
// define OutputStream to PNG Image and attach to TranscoderOutput
OutputStream ostream = new FileOutputStream("out.png");
TranscoderOutput output = new TranscoderOutput(ostream);
// create a JPEG transcoder
PNGTranscoder t = new PNGTranscoder();
// set the transcoding hints
t.addTranscodingHint(SVGAbstractTranscoder.KEY_HEIGHT, new Float(600));
t.addTranscodingHint(SVGAbstractTranscoder.KEY_WIDTH, new Float(600));
// convert and write output
t.transcode(input, output);
// flush and close the stream then exit
ostream.flush();
ostream.close();
}
}
I get the following exceptions executing it with a variety of SVG's:
Exception in thread "main" org.apache.batik.transcoder.TranscoderException: null
Enclosed Exception:
Could not write PNG file because no WriteAdapter is availble
at org.apache.batik.transcoder.image.ImageTranscoder.transcode(ImageTranscoder.java:132)
at org.apache.batik.transcoder.XMLAbstractTranscoder.transcode(XMLAbstractTranscoder.java:142)
at org.apache.batik.transcoder.SVGAbstractTranscoder.transcode(SVGAbstractTranscoder.java:156)
at com.example.Main.main(Main.java:26)
Batik version (reported by Maven):
version=1.9
groupId=org.apache.xmlgraphics
artifactId=batik-transcoder
I get the same error with Batik 1.7.
Suggestions?

Answer 1

The problem was solved by Peter Coppens on the xmlgraphics-batik-users mailing list. The problem is that the Maven repository for Batik 1.9 is missing a dependency, which can be addressed by adding to pom.xml:
<dependency>
<groupId>org.apache.xmlgraphics</groupId>
<artifactId>batik-codec</artifactId>
<version>1.9</version>
</dependency>
The cryptic exception disappears and the code functions as expected with this addition. This was reported as a bug for Batk 1.7 (https://bz.apache.org/bugzilla/show_bug.cgi?id=44682).