Attachment 4131 Details for Bug 14962 – My experiences with the bug

My experiences with the bug

fopbug.txt (text/plain), 2.42 KB, created by Michael Mutschler on 2002-12-11 17:11:43 UTC

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Creator: Michael Mutschler

Created: 2002-12-11 17:11:43 UTC

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patch

obsolete

>Comments on Bug #14962 
>
>I have the same error, and I traced the bug down a bit more, and hope
>it helps for fixing the bug. I'm using fop0.20.5rc.
>
>I have the exception when there is a "rollback" during the layout.
>Then the IDref is stored twice. It seems that the rollback-feature
>of a block doesn't take care of the generated IDs. I used fop in my
>personal application so I have the actual stacktrace of the error:
>
>org.apache.fop.apps.FOPException: The id "chap_EPILOG" already exists in this document
>        at org.apache.fop.datatypes.IDReferences.createID(IDReferences.java:77)
>        at org.apache.fop.fo.flow.Block.layout(Block.java:148)
>        at org.apache.fop.fo.flow.Block.layout(Block.java:206)
>        at org.apache.fop.fo.flow.AbstractFlow.layout(AbstractFlow.java:113)
>        at org.apache.fop.fo.flow.AbstractFlow.layout(AbstractFlow.java:68)
>        at org.apache.fop.fo.pagination.PageSequence.makePage(PageSequence.java:352)
>        at org.apache.fop.fo.pagination.PageSequence.format(PageSequence.java:290)
>        at org.apache.fop.apps.StreamRenderer.render(StreamRenderer.java:210)
>        at org.apache.fop.fo.FOTreeBuilder.endElement(FOTreeBuilder.java:177)
>        at org.apache.fop.tools.DocumentReader.parse(DocumentReader.java:461)
>        at org.apache.fop.apps.Driver.render(Driver.java:457)
>        at org.apache.fop.apps.Driver.render(Driver.java:477)
>
>I added some println()s into the code, and in AbstractFlow.java in the
>layout()-Method (Line72) there is a loop with the following part:
>
>  if (bac.isBalancingRequired(fo)) {
>      // reset the the just-done span area in preparation
>      // for a backtrack for balancing
>      bac.resetSpanArea();
>
>      this.rollback(markerSnapshot);
>      // one less because of the "continue"
>      i = this.marker - 1;
>      continue;
>  }
>
>In my case, when there happens this rollback() with the block containing the
>IDRef, this exception occurs. It seems, that the status of the IDs is not
>stored in the snapshot used for rollback, and therefore the ID is stored twice
>during the layout.
>
>In the previously attached example this doesn't happen; but IMHO this relates
>to the same error.
>
>I hope this helps. If there are more questions feel free to send me a mail to
>michael@mutschler.de
>
>To get it actually running, I removed the thrown exception in
>org.apache.fop.datatypes.IDReferences line 77.
>This is no fix, only a patch so it renders my files!!

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