Why IDEA Blocks Java 8 Spring Boot Projects—and How to Bypass It

Why IntelliJ IDEA cannot create Java 8 Spring Boot projects

IDEA generates a Spring Boot project by calling the Spring Initializr service at https://start.spring.io. Since Spring Boot 3.0 the official policy requires Java 17 as the minimum JDK, and the Initializr therefore only offers Spring Boot 3.x and Java 17+ options. IDEA simply reflects the options returned by the service, so Java 8 is not shown.

Creating a Java 8 Spring Boot project

If a project must target Java 8 (which implies Spring Boot 2.x), you can point IDEA to an alternative Initializr that still provides older versions. Alibaba Cloud offers such a service at https://start.aliyun.com.

Open Settings/Preferences → Tools → Spring Initializr in IntelliJ IDEA.

Replace the default URL https://start.spring.io with https://start.aliyun.com.

Apply the changes and reopen the “New Project” wizard. The JDK selector will now include Java 8 and the Spring Boot selector will list 2.x releases.

Note: the Alibaba Cloud starter is not actively maintained; its latest supported Spring Boot version is 3.0.2, and it may lack newer bug‑fix releases.

Why prefer Java 17 and Spring Boot 3 for new projects

GraalVM native image support : Enables faster startup and lower memory consumption, useful for cloud‑native and serverless deployments.

ZGC garbage collector (JDK 17) : Provides near‑zero pause times; some organizations report up to 90 % reduction in GC latency after migration.

Improved HTTP client : Spring Boot 3 uses a more performant default client.

New Java language features (records, sealed classes, switch expressions, text blocks, etc.) that simplify code and improve safety.

Ecosystem alignment : Major projects such as Alibaba Nacos 3.0 have already moved to JDK 17 and Spring Boot 3.4.1, indicating that older versions will face compatibility challenges.

Summary

IDEA hides Java 8 because the default Spring Initializr ( start.spring.io) only supports Spring Boot 3+ (Java 17+).

To generate a Java 8‑based Spring Boot 2.x project, replace the Initializr URL with https://start.aliyun.com in IDEA’s settings.

For new projects, adopt at least Java 17 and Spring Boot 3+ to benefit from performance improvements, new language features, and future‑proof ecosystem compatibility.