i am just beginning to work with batik, and have a couple of
problems. one of the problems regards to the TranscodingHintKey...
maybe i explain first:
i am working with apache cocoon 2.0.1. my goal is to define a
pipeline, which contains a custom generator (calculating diagram
informations), the generated xml is transformed to svg via xsl and
then rendered as jpeg (or png whatever), using the svg2jpeg
serializer.
the problem is that i have to restart the server, if i re-deploy
the application. it doesn't matter wheter i use tomcat 3.2.4
standalone or in combination with jboss 2.2.2.
the origin of the problem seems to be:
<code>
final class TranscodingHintKey extends RenderingHints.Key {
TranscodingHintKey() {
super(10100);
}
</code>
because i get the error message:
<snip>
java.lang.ExceptionInInitializerError:
java.lang.IllegalArgumentException: Instance(10100) of
org.apache.batik.ext.awt.TranscodingHintKey already registered
at
java.awt.RenderingHints$Key.recordIdentity(RenderingHints.java:45)
at java.awt.RenderingHints$Key.<init>(RenderingHints.java:64)
at
org.apache.batik.ext.awt.TranscodingHintKey.<init>(Unknown Source)
at
org.apache.batik.ext.awt.RenderingHintsKeyExt.<clinit>(Unknown
Source)
</snip>
while RenderingHints.Key has only unique instances, the (second)
instantiation of the TranscodingHintKey results in the exception.
by the way: this exception does not just occur when re-deploying an
application, it gets also thrown, if you access batik from two
different applications; example: the cocoon/hello.svg and a custom
application myapp/diagram.svg. the second call results in that
exception.
while i am not familiar with the java.awt.RenderingHints class, it
should be possible to use a singleton like pattern, to return the
existing TranscodingHintKey instance, if it exists. i am looking
for a solution, but any help would be appreciated!
thank you,
moritz.
p.s.: currently i am using mac os x 10.1.3, jdk 1.3.1 on a
powerbook g4. but i know that this problem also happens with a
win2k operating system.
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