[GitHub] [camel-quarkus] JiriOndrusek commented on issue #1642: FOP native support

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JiriOndrusek commented on issue #1642:
URL: https://github.com/apache/camel-quarkus/issues/1642#issuecomment-686325091


   It s not possible to creative native extension for camel-fop.
   The effort is blocked by this error (during native execution):
   
   >Error: No instances of sun.nio.ch.FileChannelImpl are allowed in the image heap as this class should be initialized at image runtime. Object has been initialized without the native-image initialization instrumentation and the stack trace can't be tracked.
   Trace: Object was reached by 
   	reading field sun.font.TrueTypeFont$TTDisposerRecord.channel of
   		constant sun.font.TrueTypeFont$TTDisposerRecord@2c7b7d19 reached by 
   	reading field java.util.Hashtable$Entry.value of
   		constant java.util.Hashtable$Entry@66aeea4 reached by 
   	indexing into array
   		constant java.util.Hashtable$Entry[]@7be2410f reached by 
   	reading field java.util.Hashtable.table of
   		constant java.util.Hashtable@33cc3b6c reached by 
   	scanning method sun.java2d.Disposer.addObjectRecord(Disposer.java:250)
   
   I was able to debug some calls to TrueTypeFont (in case of conversion into pcl, png). This showed me some calls from fop, which causes initialization of these classes.
   E.g.: https://github.com/apache/xmlgraphics-fop/blob/trunk/fop-core/src/main/java/org/apache/fop/render/java2d/InstalledFontCollection.java#L79, https://github.com/apache/xmlgraphics-fop/blob/trunk/fop-core/src/main/java/org/apache/fop/render/java2d/Java2DFontMetrics.java#L318
   But unfortunately there are a lot of other calls to similar awt classes from fop (or from batik - which is dependency of fop)
   
   
   My WIP is here: https://github.com/JiriOndrusek/camel-quarkus/tree/1642-FOP-native
   (JVM test is working, native fails with above error)


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