XWiki initializing with an exception saying: The resolver parameter doesn't contain an Entity Reference of type [SPACE]

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1

We are in the testing upgrade path from XWiki v7.0.1 to v13.10.9, currently reaching v7.4.6. Everything else looks OK, and we just noticed the issue below:

After starting tomcat, we send the first HTTP request to the web server. While the browser shows the initialization in progress, the system log shows an exception saying java.lang.IllegalArgumentException: The resolver parameter doesn't contain an Entity Reference of type [SPACE].

We will highly appreciate any hints or suggestions.

Details:

For logging, we used the command tail -f /www/tomcat8/logs/* /var/log/messages, so the attached text file contains the full trace since tomcat start. logs-v7.4.6-running-with-exceptions.txt (43.6 KB)

More detailed exception message:

2022-09-30 12:58:22,119 [XWiki Solr index job thread] ERROR o.x.s.s.i.j.IndexerJob         - Exception thrown during job execution
java.lang.IllegalArgumentException: The resolver parameter doesn't contain an Entity Reference of type [SPACE]
        at org.xwiki.model.internal.reference.ExplicitReferenceEntityReferenceResolver.getDefaultReference(ExplicitReferenceEntityReferenceResolver.java:45) ~[xwiki-platform-model-7.4.6.jar:7.4.6]
        at org.xwiki.model.internal.reference.AbstractEntityReferenceResolver.resolveDefaultReference(AbstractEntityReferenceResolver.java:77) ~[xwiki-platform-model-7.4.6.jar:7.4.6]
        at org.xwiki.model.internal.reference.AbstractReferenceEntityReferenceResolver.resolve(AbstractReferenceEntityReferenceResolver.java:67) ~[xwiki-platform-model-7.4.6.jar:7.4.6]
        at org.xwiki.model.internal.reference.AbstractReferenceEntityReferenceResolver.resolve(AbstractReferenceEntityReferenceResolver.java:41) ~[xwiki-platform-model-7.4.6.jar:7.4.6]
        at org.xwiki.search.solr.internal.reference.SolrEntityReferenceResolver.resolveMissingReference(SolrEntityReferenceResolver.java:175) ~[xwiki-platform-search-solr-api-7.4.6.jar:7.4.6]
        at org.xwiki.search.solr.internal.reference.SolrEntityReferenceResolver.getSpaceReference(SolrEntityReferenceResolver.java:113) ~[xwiki-platform-search-solr-api-7.4.6.jar:7.4.6]
        at org.xwiki.search.solr.internal.reference.SolrEntityReferenceResolver.getEntityReference(SolrEntityReferenceResolver.java:73) ~[xwiki-platform-search-solr-api-7.4.6.jar:7.4.6]
        at org.xwiki.search.solr.internal.reference.SolrEntityReferenceResolver.resolve(SolrEntityReferenceResolver.java:65) ~[xwiki-platform-search-solr-api-7.4.6.jar:7.4.6]
        at org.xwiki.search.solr.internal.reference.SolrEntityReferenceResolver.resolve(SolrEntityReferenceResolver.java:48) ~[xwiki-platform-search-solr-api-7.4.6.jar:7.4.6]
        at org.xwiki.search.solr.internal.reference.SolrDocumentReferenceResolver.resolve(SolrDocumentReferenceResolver.java:48) ~[xwiki-platform-search-solr-api-7.4.6.jar:7.4.6]
        at org.xwiki.search.solr.internal.reference.SolrDocumentReferenceResolver.resolve(SolrDocumentReferenceResolver.java:38) ~[xwiki-platform-search-solr-api-7.4.6.jar:7.4.6]
        at org.xwiki.search.solr.internal.job.SolrDocumentIterator.next(SolrDocumentIterator.java:99) ~[xwiki-platform-search-solr-api-7.4.6.jar:7.4.6]
        at org.xwiki.search.solr.internal.job.SolrDocumentIterator.next(SolrDocumentIterator.java:54) ~[xwiki-platform-search-solr-api-7.4.6.jar:7.4.6]
        at org.xwiki.search.solr.internal.job.DiffDocumentIterator.next(DiffDocumentIterator.java:120) ~[xwiki-platform-search-solr-api-7.4.6.jar:7.4.6]
        at org.xwiki.search.solr.internal.job.IndexerJob.updateSolrIndex(IndexerJob.java:135) ~[xwiki-platform-search-solr-api-7.4.6.jar:7.4.6]
        at org.xwiki.search.solr.internal.job.IndexerJob.updateSolrIndex(IndexerJob.java:118) ~[xwiki-platform-search-solr-api-7.4.6.jar:7.4.6]
        at org.xwiki.search.solr.internal.job.IndexerJob.runInternal(IndexerJob.java:94) ~[xwiki-platform-search-solr-api-7.4.6.jar:7.4.6]
        at org.xwiki.job.AbstractJob.runInContext(AbstractJob.java:205) [xwiki-commons-job-7.4.6.jar:7.4.6]
        at org.xwiki.job.AbstractJob.run(AbstractJob.java:188) [xwiki-commons-job-7.4.6.jar:7.4.6]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_342]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_342]
        at java.lang.Thread.run(Thread.java:750) [na:1.8.0_342]
2

This is just a warning from the Solr Search index that it cannot read something (unfortunately it is not always very explicit about what it is). It usually is nothing critical.

Maybe you need to run the “Nested Pages Migrator” to migrate your pages from the “space/page” to the “nested pages” structure. Or you can try to delete the solr index from the file system and reindex, and see if the error goes away.