SOLR

Solution:

 # java --version && /opt/solr/bin/solr --version

Output:

Problem:

Uninstall / remove Apache Solr 9.x completely

Solution:

service solr stop  && rm -rfv /var/solr && rm -v /etc/init.d/solr  && rm -rfv /opt/solr  && rm -rfv /opt/solr-9* && rm -rfv /etc/default/solr.in.sh

additionally (if needed): 

Problem:

...
Service solr installed.
Customize Solr startup configuration in /etc/default/solr.in.sh
Job for solr.service failed because the control process exited with error code.
See "systemctl status solr.service" and "journalctl -xeu solr.service" for details.

Problem:

Failed to start solr.service - LSB: Controls Apache Solr as a Service.

More details:

Problem, when I call http://127.0.0.1:8983/solr/:

Searching for Solr?
You must type the correct path.
Solr will respond. 

Solution?

Problem:

Error CREATEing SolrCore 'test_index': Unable to create core [test_index] Caused by: solr.ICUCollationField

Solution?

Problem:

Error CREATEing SolrCore 'new_core': Unable to create core [new_core] Caused by: Can't find resource 'solrconfig.xml' in classpath or '/var/solr/data/new_core'

Solution?

Problem:

Problem:

Software / Platforms: Apache Webserver, nginx, MariaDB, PHP 8.3, Plesk, Apache Solr