The JVM ecosystem survey report reveals that Kotlin has overtaken Scala and Clojure to become the second most popular language on the JVM, surpassing them in popularity. The majority of developers still use Java as their main language, with 64% reporting that Java 8 remains the most often used release. Spring dominates the Java ecosystem with 60% using it for their main applications, while IntelliJ IDEA dominates the IDE market with 62% adoption among JVM developers. The survey also shows that 36% of developers switched from Oracle JDK to an alternate OpenJDK distribution over the last year, highlighting a growing trend towards open-source alternatives. Additionally, the report highlights the importance of Java modules in the JVM ecosystem, with only 7% of respondents already using them and 29% planning to use them in the future. Overall, the survey provides valuable insights into the trends and preferences of developers working on the JVM ecosystem.