Character encoding error when creating new spreadsheet

[pnemonic78]

Error exporting: java.nio.charset.CharsetICU[UTF-8]
  java.nio.charset.IllegalCharsetNameException: java.nio.charset.CharsetICU[UTF-8]
  at java.nio.charset.Charset.checkCharsetName(Charset.java:201)
  at java.nio.charset.Charset.forName(Charset.java:295)
  at org.apache.commons.compress.archivers.zip.ZipEncodingHelper.getZipEncoding(ZipEncodingHelper.java:58)
  at org.apache.commons.compress.archivers.zip.ZipArchiveInputStream.<init>(ZipArchiveInputStream.java:431)
  at org.apache.commons.compress.archivers.zip.ZipArchiveInputStream.<init>(ZipArchiveInputStream.java:408)
  at org.odftoolkit.odfdom.pkg.ZipHelper.createZipInputStream(ZipHelper.java:61)
  at org.odftoolkit.odfdom.pkg.ZipHelper.entriesToMap(ZipHelper.java:81)
  at org.odftoolkit.odfdom.pkg.OdfPackage.readZip(OdfPackage.java:529)
  at org.odftoolkit.odfdom.pkg.OdfPackage.initializeZip(OdfPackage.java:509)
  at org.odftoolkit.odfdom.pkg.OdfPackage.<init>(OdfPackage.java:318)
  at org.odftoolkit.odfdom.pkg.OdfPackage.loadPackage(OdfPackage.java:389)
  at org.odftoolkit.odfdom.doc.OdfDocument.loadTemplate(OdfDocument.java:180)
  at org.odftoolkit.odfdom.doc.OdfSpreadsheetDocument.newSpreadsheetDocument(OdfSpreadsheetDocument.java:79)

[pnemonic78]

Suggestion:

replace in ZipHelper
return new ZipArchiveInputStream(is, StandardCharsets.UTF_8.toString(), true, true);
with
return new ZipArchiveInputStream(is, StandardCharsets.UTF_8.name(), true, true);

[svanteschubert]

Nice catch! Thank you!
Do you have some simplified test document to reproduce the issue?
Most welcome would be a patch of yours where there is a test involved that earlier fails and with your patch would be working!
Thanks in advance!

Greetings from the LibreOffice Conference in Bukarest! :-)
Svante