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https://issues.apache.org/jira/browse/SOLR-16219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17543737#comment-17543737
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Shawn Heisey commented on SOLR-16219:
-------------------------------------
I'm trying to figure out if there is a way we can temporarily flag accesses of
a protected field from another class in the same package, and review each one
to determine whether it is likely that the classes in question will be loaded
by a different classloader. I think some developer docs have been started ...
it's probably a good idea in the module section of those docs to warn against
this.
For me, the effort of looking into that is hampered by something relating to
eclipse, the IDE that I am most familiar with. Currently in the latest eclipse
version, the main branch shows a number of errors in addition to the thousands
of warnings that have always been there. These errors do not interrupt
building with gradle.
[~magibney] I am happy to let you fix it.
> 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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