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https://issues.apache.org/jira/browse/TAP5-2588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16663659#comment-16663659
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Bob Harner commented on TAP5-2588:
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Andrzej (and others), if you can build Tapestry from source then you can try
out the potential version 5.5 now. Unfortunately, Tapestry's snapshot build
process is currently broken for other reasons, so you can't just point to a
snapshot repo to get the jars.
> Does not work with Java 9
> -------------------------
>
> Key: TAP5-2588
> URL: https://issues.apache.org/jira/browse/TAP5-2588
> Project: Tapestry 5
> Issue Type: Bug
> Components: plastic
> Affects Versions: 5.4.3
> Reporter: Jochen Kemnade
> Assignee: Bob Harner
> Priority: Critical
>
> You cannot use Tapestry with Java 9 because of an outdated ASM version in
> plastic (5.0.4). AFAICT, we'll need to upgrade to 6.0. My attempt do do so
> results in a {{ClassCastException}} in
> {{org.apache.tapestry5.plastic.ArrayAttributeAnnotations.explicit values for
> array attributes}}.
> {noformat}
> java.lang.ClassCastException: [I cannot be cast to
> java.base/[Ljava.lang.Object;
> at
> org.apache.tapestry5.internal.plastic.AbstractAnnotationBuilder$2.visitEnd(AbstractAnnotationBuilder.java:134)
> at
> org.apache.tapestry5.internal.plastic.asm.tree.AnnotationNode.accept(AnnotationNode.java:284)
> at
> org.apache.tapestry5.internal.plastic.asm.tree.AnnotationNode.accept(AnnotationNode.java:251)
> at
> org.apache.tapestry5.internal.plastic.PlasticClassPool.createAnnotation(PlasticClassPool.java:307)
> at
> org.apache.tapestry5.internal.plastic.PlasticClassPool$4.buildAnnotation(PlasticClassPool.java:286)
> at
> org.apache.tapestry5.internal.plastic.PlasticClassPool$4.getAnnotation(PlasticClassPool.java:270)
> at
> org.apache.tapestry5.internal.plastic.DelegatingAnnotationAccess.getAnnotation(DelegatingAnnotationAccess.java:42)
> at
> org.apache.tapestry5.internal.plastic.PlasticClassImpl.getAnnotation(PlasticClassImpl.java:342)
> at org.apache.tapestry5.plastic.ArrayAttributeAnnotations.explicit
> values for array attributes(ArrayAttributeAnnotations.groovy:27)
> {noformat}
> The {{AbstractAnnotationBuilder}} subclass tries to cast an {{int[]}} to an
> {{Object[]}}.
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