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Published Jul. 2, 2025

ClassCastException when using Elasticsearch 7

Written By

Michael Warren Young

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Issue

  • After installing the Elasticsearch 7 plugin and connecting Liferay DXP to an Elasticsearch 7 server, errors like this are thrown on startup:

    ERROR [liferay/scheduler_dispatch-4][ElasticsearchIndexSearcher:169] java.lang.ClassCastException: org.elasticsearch.search.sort.FieldSortBuilder cannot be cast to org.elasticsearch.search.sort.SortBuilder

    java.lang.ClassCastException: org.elasticsearch.search.sort.FieldSortBuilder cannot be cast to org.elasticsearch.search.sort.SortBuilder

Environment

  • Liferay DXP 7.2 (with fix pack DXP-2+)
  • Elasticsearch 7

Resolution

  • A ClassCastException can be thrown when multiple versions of the Elasticsearch plugin are running at the same time.
  • After deploying the Elasticsearch 7 module, it's necessary to add the Elasticsearch 6 module to the blacklist by creating a config file named 
    com.liferay.portal.bundle.blacklist.internal.BundleBlacklistConfiguration.config
    With the following content:


     
  • blacklistBundleSymbolicNames=[ \
    "com.liferay.portal.search.elasticsearch6.api", \
    "com.liferay.portal.search.elasticsearch6.impl", \
    "com.liferay.portal.search.elasticsearch6.spi", \
    "com.liferay.portal.search.elasticsearch6.xpack.security.impl", \
    "Liferay Connector to X-Pack Security [Elastic Stack 6.x] - Impl" \
]

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