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https://issues.apache.org/jira/browse/BATIK-1228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16579740#comment-16579740
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Erich Schubert commented on BATIK-1228:
---------------------------------------
If batik-codecs is missing, then a dependency should be added to the
application that uses this functionality!
Not everybody needs codecs (for example, you may want to only output SVG files,
not PNGs) - so it is appropriate to have them optional; if you use the codecs
you should have a dependency on the codecs.
But this could also be caused by the registry cache refresh bug BATIK-1203 that
has a fix, but is not being merged...
If writers are added in non-increasing order, they may not be found; because
the code only resets the cache to null if it appended the new entry to the end
of the list. So if jar A is loaded first, and has a high priority entry, the
cache is initialized inbetween, and then jar B adds another entry with lower
priority, that entry will not be returned.
> NPE in SVGGen not working due to non-registered image writers
> -------------------------------------------------------------
>
> Key: BATIK-1228
> URL: https://issues.apache.org/jira/browse/BATIK-1228
> Project: Batik
> Issue Type: Bug
> Components: SVGGraphics2D, Utilities
> Affects Versions: 1.9
> Environment: Eclipse
> Reporter: Ansgar Radermacher
> Priority: Critical
>
> There is an NPE in class ImageHandlerBase64Encoder (in batik-svggen) in the
> 1.9.1 build for Eclipse photon in the following code (which gets triggered by
> a "File->Save as Image" in Papyrus).
> ImageWriter writer =
> ImageWriterRegistry.getInstance().getWriterFor("image/png");
> writer.writeImage(buf, os);
> ...
> No ImageWriter is registered for "image/png", i.e writer is null after the
> assignment. The ImageIOPNGImageWriter (and others) from the batik codec
> package are not "visible" for the class Service in utils which it used by the
> ImageWriterRegistry to detect available writers.
> This is due to a missing dependency from batik-util to batik-codec, as
> proposed in [https://bz.apache.org/bugzilla/show_bug.cgi?id=44682] and
> [https://stackoverflow.com/questions/16138850/batik-svggraphics2d-nullpointerexception-when-drawing-image].
> However, this solution is not possible (at least not on Eclipse level),
> since batik.codec also depends on batik.util, i.e. would introduce a
> dependency cycle.
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