Failed to merge PDF with footer

Describe the bug

Failed to merge PDF with footer when installing libraries manually..

To reproduce

1. Manually place JSignPdf.jar in /opt/libresign.
2. Set correct ownership and permissions (www-data:www-data, 755)
3. Installed java,pdftk from debian repositories
4. Set the path manually
5. php occ config:app:set libresign jsignpdf_path --value "/opt/libresign/jsignpdf-2.3.0/JSignPdf.jar"
6. php occ config:app:set libresign java_path --value "/usr/bin/java"
7. php occ config:app:set libresign pdftk_path --value "/usr/bin/pdftk"

Expected behavior

LibreSign should merge the PDF with the footer successfully, even if the libraries were installed manually instead of "occ libresign:install --all"

Screenshots

Environment information

1. Nextcloud version: Nextcloud Hub 10(31.0.5)
2. LibreSign version: 11.6.0
3. PHP version: 8.2.28
4. OS: debian 12 (bookworm)
5. Java: openjdk 17.0.17
6. JSignPdf version: 2.3.0
7. pdftk: pdftk port to java 3.3.2 a Handy Tool for Manipulating PDF Documents

root@nextcloud:/var/www/nextcloud# php occ config:app:get libresign java_path
/usr/bin/java
root@nextcloud:/var/www/nextcloud# php occ config:app:get libresign pdftk_path
/usr/bin/pdftk
root@nextcloud:/var/www/nextcloud# php occ config:app:get libresign jsignpdf_path
/opt/libresign/jsignpdf-2.3.0/JSignPdf.jar
root@nextcloud:/var/www/nextcloud#

Additional context

For java, pdftk, and jsignpdf, the “Invalid hash of binary files” error is expected because I manually set the paths instead of using occ libresign:install --all, so the verification fails. However, this should not be a problem since the paths are correctly set. I didn’t want to install these libraries through LibreSign because they are already installed on my system from repositories except jsignpdf and I want to use them.

Does it have to be installed through occ libresign:install --all? If not, what could be the possible issues?

Start by reproducing the PDF footer merge with the manually configured java_path, pdftk_path, and jsignpdf_path values, then inspect the libresign:install --all flow and the binary hash verification behavior. Compare the manual-install path with the installed-library path and confirm that merging succeeds without requiring LibreSign-managed binaries.