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https://issues.apache.org/jira/browse/FOP-2569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17125630#comment-17125630
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onkelpax-fop commented on FOP-2569:
-----------------------------------

Hi.

4 years later and this issue became a big problem. Hyphenation cannot be run 
with the latest OpenOffice hyphenation resources for {{de-DE}}:

[https://extensions.openoffice.org/en/project/german-de-de-frami-dictionaries]

In the past, it had approximately 11,000 pattern entries. Now it has about 
70,000 entries. Apache FOP tears down on initialization with those patterns 
with a {{StackOverflowError}} in the mentioned method.

Even if I increase the stack size up to 100 MB ({{-Xss100m}}), the 
initialization requires several minutes and finally aborts with 
{{StackOverflowError}}.

Unfortunately, it's not very easy to transform the underlying recursive 
algorithm into an iterative one.

What are the plans for this FOP hyphenation project? It may work with English 
language resources, but there are several further languages out there, that may 
have a lot of more patterns!

Regards

> Exception in thread "main" java.lang.StackOverflowError at 
> org.apache.fop.hyphenation.TernaryTree.insert(TernaryTree.java:244)
> ------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: FOP-2569
>                 URL: https://issues.apache.org/jira/browse/FOP-2569
>             Project: FOP
>          Issue Type: Bug
>    Affects Versions: 2.0
>            Reporter: Mathieu Malaterre
>            Priority: Major
>             Fix For: 1.1
>
>
> fop + offo is broken since release 2.0 (and 2.1). It used to be possible to 
> build fop-hyph.jar using fop 1.1. Please resurrect a working hyph building 
> mechanism.
> Here is what it states:
> $ /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java -Xss512k -classpath
> /home/mathieu/debian/fop/fop-2.1/build/classes
> org.apache.fop.hyphenation.SerializeHyphPattern
> /home/mathieu/debian/fop/fop-2.1/hyph
> /home/mathieu/debian/fop/fop-2.1/build/classes/hyph
> Processing /home/mathieu/debian/fop/fop-2.1/hyph/sa.xml
> Exception in thread "main" java.lang.StackOverflowError
> at org.apache.fop.hyphenation.TernaryTree.insert(TernaryTree.java:244)
> at org.apache.fop.hyphenation.TernaryTree.insert(TernaryTree.java:244)
> at org.apache.fop.hyphenation.TernaryTree.insert(TernaryTree.java:244)
> at org.apache.fop.hyphenation.TernaryTree.insert(TernaryTree.java:244)
> [...]
> at org.apache.fop.hyphenation.TernaryTree.insert(TernaryTree.java:244)
> See thread:
> http://mail-archives.apache.org/mod_mbox/xmlgraphics-fop-users/201602.mbox/%3CCA%2B7wUszWN2PdZY_t_Kgn0E4eatL7CUQswOWj9XC%3Dg9GDdgsyXw%40mail.gmail.com%3E



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