Java error

[philja]

Epubcheck is failing on any epub I try on my Windows box - epubs known to be good on my other machines. And using Sigil 2.6.0.

I bit the bullet yesterday and upgraded my W10 box to W11 since we're getting close to the end of support for W10. All seemed to upgrade without problems but it looks like something fouled up java.

Epubcheck fails with about 1000 lines of error message like this:

Running EPUBCheck 5.2.1... please wait.
EPUBCheck Java error.
java.lang.StackOverflowError
at com.thaiopensource.relaxng.pattern.InterleavePattern.checkRestrictions(InterleavePattern.java:35)
at com.thaiopensource.relaxng.pattern.InterleavePattern.checkRestrictions(InterleavePattern.java:35)
at com.thaiopensource.relaxng.pattern.InterleavePattern.checkRestrictions(InterleavePattern.java:35)
at com.thaiopensource.relaxng.pattern.InterleavePattern.checkRestrictions(InterleavePattern.java:35)
at com.thaiopensource.relaxng.pattern.InterleavePattern.checkRestrictions(InterleavePattern.java:37)
at com.thaiopensource.relaxng.pattern.BinaryPattern.checkRestrictions(BinaryPattern.java:22)
at com.thaiopensource.relaxng.pattern.GroupPattern.checkRestrictions(GroupPattern.java:27)
at com.thaiopensource.relaxng.pattern.ElementPattern.checkRestrictions(ElementPattern.java:42)

I don't know how 'thaiopensource' came into the equation. I never had anything to do with thai nor any other asian language.

I checked that java is up to date - version 8 build 461.

Anyone got any ideas how I can sort this?

[KevinH]

Yes a java stack overflow failures often happen when you use a 32 bit java virtual machine and do not grow the default stack size. There are two solutions:

Using Doitsu's epubcheck plugin you can grow the stack by setting options in his preferences.

Or simply upgrade to use a 64 bit java virtual machine.

I recommend the latter if your machine supports 64 bit.

[DNSB]

I would agree with @KevinH. Since your Windows 11 on X64 install must be 64bit, you should upgrade your Java install to 64bit.

[Doitsu]

Originally Posted by philja

Anyone got any ideas how I can sort this?

If you don't want to install a 64bit Java version, locate EpubCheck.json and insert the following entry between the first and second entries:

  "is32bit": true,

or change the value to true, if the entry already exists.

[philja]

Hi all, thanks for the responses. I'll check that this afternoon when I'm back.

Sigil and its epubchek plugin had been working perfectly well on that machine under Windows 10 since I replaced the hardware 2 years ago. I thought everything had been 64-bit for years. Why would an upgrade to W11 introduce anything 32-bit?

[DiapDealer]

My guess is that an older 32-bit version of Java was not causing the issue (that particular limitation of the relaxNG engine was introduced with a particular version of the 32-bit java if I recall correctly). That's why increasing the stack or installing the 64-bit version was recommended back then. Your upgrade to Windows 11 more than likely included an upgrade to the pre-existing (and likely non-problematic) 32-bit java, and that's what caused your problem.

Nothing nefarious or unusual in the "com.thaiopensource" message. That's a normal part of EPubCheck. The issue had nothing to do with your particular epub including (or not including) Asian languages.

[philja]

All fixed - thanks.

First of all, I checked the epubcheck.json file and found 'is32bit' set to 'false'. This seemed entirely normal to me because I hadn't knowingly used any 32-bit stuff for years.

Then I set it to 'true' and tested an epub file. Epubcheck worked fine - no errors. Reset it to 'false'.

I then deleted java from the PC and reloaded 64-bit java from java.com.

Retested Sigil and epubcheck. All ok.

Originally posted by DiapDealer: Your upgrade to Windows 11 more than likely included an upgrade to the pre-existing (and likely non-problematic) 32-bit java, and that's what caused your problem.

I guess that's what happened. After the W11 upgrade, Java announced it needed to update and I suppose, having found a 32-bit version, it fetched me the latest 32-bit version.

Thankyou Microsoft