I'm using Spring Boot 2.3.5 release which looks to be on Spring Framework 5.2.10.

In NamedParameterJdbcTemplate, you have:

    private volatile ConcurrentLruCache<String, ParsedSql> parsedSqlCache =
            new ConcurrentLruCache<>(DEFAULT_CACHE_LIMIT, NamedParameterUtils::parseSqlStatement);

Imported as org.springframework.util.ConcurrentLruCache

Eclipse shows that ConcurrentLruCache is now a private static class in MimeTypeUtils. This breaks a lot of stuff.

Comment From: sbrannen

org.springframework.util.ConcurrentLruCache was introduced as a top-level public class in Spring Framework 5.3.

Thus it appears that you have mixed versions of Spring Framework JARs in your classpath.

Please investigate your dependencies and let us know what you discover.

Comment From: SledgeHammer01

org.springframework.util.ConcurrentLruCache was introduced as a top-level public class in Spring Framework 5.3.

Thus it appears that you have mixed versions of Spring Framework JARs in your classpath.

Please investigate your dependencies and let us know what you discover.

Thanks. I guess some of the new data modules (jdbc, orm, cassandra, elastic) released over the past few days aren't compatible yet. Rolled all those back.