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I used to create my solr instance for drupal like this:

docker run -v $PWD/solrconf:/asdentcore  -e SOLR_JAVA_MEM="-Xms2G -Xmx2G" --restart unless-stopped  -p 8984:8983 -t --name asdentDevSolr -d solr:8.11
docker exec -it --user=solr asdentDevSolr  bin/solr create_core -c asdentcore -d /asdentcore

Where ./solrconf contains the files from modules/contrib/search_api_solr/solr-conf-templates/7.x.

With the new 4.x branch of search_api_solr (and 8.x contents) I get

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

I've already tried https://stackoverflow.com/questions/53161034/solr-error-unable-to-create-core-mycore-caused-by-solr-icucollationfield - didn't help.

Container logs shows the following errors:

Caused by: org.apache.solr.common.SolrException: Unable to create core [asdentcore]
Caused by: org.apache.solr.common.SolrException: Could not load conf for core asdentcore: Can't load schema /var/solr/data/asdentcore/conf/schema.xml: Plugin init failure for [schema.xml] fieldType "collated_de": Error loading class 'solr.ICUCollationField'
Caused by: org.apache.solr.common.SolrException: Can't load schema /var/solr/data/asdentcore/conf/schema.xml: Plugin init failure for [schema.xml] fieldType "collated_de": Error loading class 'solr.ICUCollationField'
Caused by: org.apache.solr.common.SolrException: Plugin init failure for [schema.xml] fieldType "collated_de": Error loading class 'solr.ICUCollationField'
Caused by: org.apache.solr.common.SolrException: Error loading class 'solr.ICUCollationField'
Caused by: java.lang.ClassNotFoundException: solr.ICUCollationField
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  • Never had an issue like this. Can you actually verify the container directory is mounted and accessible to the container user at that location?
    – Kevin
    Nov 23, 2021 at 14:16
  • Yes, I did, it's accessible. I'll add the java errors to my question.
    – Rainer Feike
    Nov 23, 2021 at 16:46
  • Also, if I set up the solr as usual with the 7.x templates till it works, then bash into the container and copy over the new conf/* files downloaded via search-api UI to /var/solr/data/asdentcore/conf - the server breaks with java.lang.ClassNotFoundException: solr.ICUCollationField - bah that's sooo bad...
    – Rainer Feike
    Nov 23, 2021 at 17:14
  • Is that container missing those files?
    – Kevin
    Nov 23, 2021 at 17:16
  • Which one? Yes, the classes I'd suppose.
    – Rainer Feike
    Nov 23, 2021 at 17:16

1 Answer 1

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Kudos to Kevin. The solution is

here https://stackoverflow.com/questions/62652640/error-when-initializing-solr-core-error-loading-class-solr-icucollationfield

and here https://www.drupal.org/project/search_api_solr/issues/3181819#comment-13899895

I had to replace in the downloaded solrcore.properties the line solr.install.dir=../../.. with solr.install.dir=/opt/solr.

One day of my live ...

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