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https://issues.apache.org/jira/browse/SOLR-16219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17543520#comment-17543520
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Shawn Heisey commented on SOLR-16219:
-------------------------------------
Do you have more than one core loaded with the same <lib> config that adds
those jars? If you do, that can cause serious problems with certain classes.
I have seen something similar with another Lucene ICU class ... if the jar gets
loaded more than once, then Java will throw class not found errors.
One possible solution is to remove all the <lib> config from all the
solrconfig.xml files you are using, create a "lib" subdirectory in your solr
home location, and put all the extra jars that your Solr install needs in that
location. Then restart Solr. They will be loaded exactly once, and all cores
will be able to use them.
> ICUCollationField tried to access protected field
> org.apache.solr.schema.IndexSchema.luceneVersion
> --------------------------------------------------------------------------------------------------
>
> Key: SOLR-16219
> URL: https://issues.apache.org/jira/browse/SOLR-16219
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 9.0
> Reporter: Roman
> Priority: Major
>
> I've tried to recreate Solr 8 configuration in Solr 9, but the following part
> in the config causes an error when creating core. (not SolrCould environment,
> if it matters)
> {code:java}
> <fieldType name="text_gen_sort" class="solr.ICUCollationField" locale=""
> numeric="true" strength="primary" multiValued="true" />{code}
> The following paths has been added in the {{{}solrconfig.xml{}}}:
> {code:java}
> <lib
> path="..../solr/modules/analysis-extras/lib/solr-analysis-extras-9.0.0.jar" />
> <lib path="..../solr/modules/analysis-extras/lib/icu4j-68.2.jar" />
> <lib
> path="..../solr/modules/analysis-extras/lib/lucene-analysis-icu-9.0.0.jar"
> />{code}
> and I checked, that the paths to jars are correct.
> The stack trace is lengthy, here the relevant part of it:
> {code:java}
> <h3>Caused by:</h3><pre>java.lang.IllegalAccessError:
> class org.apache.solr.schema.ICUCollationField tried to access
> protected field org.apache.solr.schema.IndexSchema.luceneVersion
> (org.apache.solr.schema.ICUCollationField is in
> unnamed module of loader java.net.FactoryURLClassLoader @61639b88;
> org.apache.solr.schema.IndexSchema is in unnamed module of loader
> org.eclipse.jetty.webapp.WebAppClassLoader @6a988392)
> at org.apache.solr.schema.ICUCollationField.init(ICUCollationField.java:128)
> at org.apache.solr.schema.FieldType.setArgs(FieldType.java:202)
> at
> org.apache.solr.schema.FieldTypePluginLoader.init(FieldTypePluginLoader.java:149)
> at
> org.apache.solr.schema.FieldTypePluginLoader.init(FieldTypePluginLoader.java:43)
> at
> org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:189)
> at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:531)
> at org.apache.solr.schema.IndexSchema.<init>(IndexSchema.java:188)
> at
> org.apache.solr.schema.ManagedIndexSchema.<init>(ManagedIndexSchema.java:119)
> at
> org.apache.solr.schema.ManagedIndexSchemaFactory.create(ManagedIndexSchemaFactory.java:279)
> at
> org.apache.solr.schema.ManagedIndexSchemaFactory.create(ManagedIndexSchemaFactory.java:51)
> at
> org.apache.solr.core.ConfigSetService.createIndexSchema(ConfigSetService.java:342)
> at
> org.apache.solr.core.ConfigSetService.lambda$loadConfigSet$0(ConfigSetService.java:253)
> at org.apache.solr.core.ConfigSet.<init>(ConfigSet.java:49)
> at
> org.apache.solr.core.ConfigSetService.loadConfigSet(ConfigSetService.java:249)
> at
> org.apache.solr.core.CoreContainer.createFromDescriptor(CoreContainer.java:1550)
> at org.apache.solr.core.CoreContainer.create(CoreContainer.java:1426)
> at
> org.apache.solr.handler.admin.CoreAdminOperation.lambda$static$0(CoreAdminOperation.java:92){code}
> Previous configuration with the same 3 libraries and the field type worked. I
> used {{{}bin/solr create_core -c my_core -d my_configset{}}}. The change is
> in the {{{}managed-schema.xml{}}}. (It used to be just {{manages-schema}} in
> Solr 8, but I recreated the configuration from the new default.)
> This looks to me like some kind of a bug. What can be the cause of this and
> how to overcome the problem?
> (I've also created SO question on this -
> [https://stackoverflow.com/questions/72416721/how-to-configure-icucollationfield-type-in-solr-9]
> )
>
> To recreate, just add the above mentioned parts to solrconfig.xml and
> managed-schema.xml (from _default ) and try to create a core using the
> configset.
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