Java problem (I think) with libreoffice on slackware-current

I am slowly moving from Slackware-14 to Slackware-current (aka Slackware-15-rc2). Yesterday I installed libreoffice-7.2.2 (from the alien repo) and Oracle jdk (repackaged as per the Slackware Howto). But it aborts while trying to put up the splash screen.
Code:terminate called after throwing an instance of 'com::sun::star::uno::DeploymentException'

Fatal exception: Signal 6
Stack:
/usr/lib64/libreoffice/program/libuno_sal.so.3(+0x5f8e4)[0x7f2e241098e4]
/usr/lib64/libreoffice/program/libuno_sal.so.3(+0x5fb1c)[0x7f2e24109b1c]
/usr/lib64/libreoffice/program/libuno_sal.so.3(+0x5fd1b)[0x7f2e24109d1b]
/lib64/libc.so.6(+0x3b8b0)[0x7f2e23d758b0]
/lib64/libc.so.6(gsignal+0x98)[0x7f2e23d75848]
/lib64/libc.so.6(abort+0x102)[0x7f2e23d5c526]
/usr/lib64/libstdc++.so.6(+0xa589a)[0x7f2e23ba089a]
/usr/lib64/libstdc++.so.6(+0xb106a)[0x7f2e23bac06a]
/usr/lib64/libstdc++.so.6(+0xb10d5)[0x7f2e23bac0d5]
/usr/lib64/libstdc++.so.6(+0xb1368)[0x7f2e23bac368]
/usr/lib64/libreoffice/program/libutllo.so(+0x5e9d3)[0x7f2e1f4b79d3]
/usr/lib64/libreoffice/program/libutllo.so(+0x5c942)[0x7f2e1f4b5942]
/usr/lib64/libreoffice/program/libutllo.so(+0x5d01d)[0x7fc7dc84d01d]
/usr/lib64/libreoffice/program/libutllo.so(+0x5d23e)[0x7fc7dc84d23e]
/usr/lib64/libreoffice/program/libutllo.so(_ZN3utl10ConfigItemC2ERKN3rtl8OUStringE14ConfigItemMode+0x112)[0x7fc7dc840994]
/usr/lib64/libreoffice/program/libutllo.so(+0xbd9b4)[0x7fc7dc8ad9b4]
/usr/lib64/libreoffice/program/libutllo.so(+0xc0fbb)[0x7fc7dc8b0fbb]
/usr/lib64/libreoffice/program/libutllo.so(+0xc0e7f)[0x7fc7dc8b0e7f]
/usr/lib64/libreoffice/program/libutllo.so(+0xc0cf0)[0x7fc7dc8b0cf0]
/usr/lib64/libreoffice/program/libutllo.so(+0xc0a64)[0x7fc7dc8b0a64]
/usr/lib64/libreoffice/program/libutllo.so(+0xc09b6)[0x7fc7dc8b09b6]
/usr/lib64/libreoffice/program/libutllo.so(+0xc08e9)[0x7fc7dc8b08e9]
/usr/lib64/libreoffice/program/libutllo.so(+0xc068a)[0x7fc7dc8b068a]
/usr/lib64/libreoffice/program/libutllo.so(+0xc02fc)[0x7fc7dc8b02fc
/usr/lib64/libreoffice/program/libutllo.so(_ZN19SvtSysLocaleOptionsC1Ev+0xd0)[0x7fc7dc8af328]
/usr/lib64/libreoffice/program/libvcllo.so(+0xa99835)[0x7fc7dbe1a835]
/usr/lib64/libreoffice/program/libvcllo.so(_ZN11AllSettings12GetLayoutRTLEv+0x1e)[0x7fc7dbe1a946]
/usr/lib64/libreoffice/program/libvclplug_gtk3lo.so(+0x11a0c4)[0x7fc7d50140c4]
/usr/lib64/libreoffice/program/libvclplug_gtk3lo.so(+0x11d1b3)[0x7fc7d50171b3]
/usr/lib64/libreoffice/program/libvclplug_gtk3lo.so(+0x11f132)[0x7fc7d5019132]
/usr/lib64/libreoffice/program/libvclplug_gtk3lo.so(+0x11f0ec)[0x7fc7d50190ec]
/usr/lib64/libreoffice/program/libvcllo.so(_Z7InitVCLv+0x270)[0x7fc7dbe3d22e]
/usr/lib64/libreoffice/program/libvcllo.so(_Z10ImplSVMainv+0x4a)[0x7fc7dbe3cc0d]
/usr/lib64/libreoffice/program/libvcllo.so(_Z6SVMainv+0x9)[0x7fc7dbe3cdef]
/usr/lib64/libreoffice/program/libsofficeapp.so(soffice_main+0x148)[0x7fc7e132603d]
/usr/lib64/libreoffice/program/soffice.bin[0x401175]
/usr/lib64/libreoffice/program/soffice.bin[0x40115b]
/lib64/libc.so.6(__libc_start_main+0xcd)[0x7fc7e10f501d]
/usr/lib64/libreoffice/program/soffice.bin[0x40108a]Most of what DDG brings up on this error is fairly old but this one https://lists.debian.org/debian-open.../msg00008.html is recent. Can anyone give me a hint on where to look for the problem?