Spring Boot 3.2.0-RC1 application fails on JDK with CRaC but without a dependency on org.crac:crac #38186
Description
I ran into this problem while starting to prepare for Spring Boot 3.2 upgrade on one of the project's I'm currently working on. The problem is reproducible on simplest possible Spring Boot application based on 3.2.0-RC1 that doesn't use CRaC but runs on JDK with CRaC. Such setup results in the following error:
java.lang.NoClassDefFoundError: org/crac/management/CRaCMXBean at org.springframework.boot.SpringApplication$CoordinatedRestoreAtCheckpointStartup.restoreTime(SpringApplication.java:1712) ~[spring-boot-3.2.0-RC1.jar:3.2.0-RC1] at org.springframework.boot.SpringApplication$CoordinatedRestoreAtCheckpointStartup.startTime(SpringApplication.java:1717) ~[spring-boot-3.2.0-RC1.jar:3.2.0-RC1] at org.springframework.boot.SpringApplication$Startup.started(SpringApplication.java:1673) ~[spring-boot-3.2.0-RC1.jar:3.2.0-RC1] at org.springframework.boot.SpringApplication.run(SpringApplication.java:324) ~[spring-boot-3.2.0-RC1.jar:3.2.0-RC1] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1336) ~[spring-boot-3.2.0-RC1.jar:3.2.0-RC1] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1325) ~[spring-boot-3.2.0-RC1.jar:3.2.0-RC1] at sample.SampleApplication.main(SampleApplication.java:23) ~[main/:na] Caused by: java.lang.ClassNotFoundException: org.crac.management.CRaCMXBean at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[na:na] at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188) ~[na:na] at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[na:na] ... 7 common frames omitted I ran into this by building the project on GitHub Actions and using Zulu JDK 17, and in such environment the JDK variant with CRaC will be installed:
- name: Setup Java uses: actions/setup-java@0ab4596768b603586c0de567f2430c30f5b0d2b0 # v3.13.0 with: distribution: zulu java-version: 17Run actions/setup-java@0ab4596768b603586c0de567f2430c30f5b0d2b0 with: distribution: zulu java-version: 17 java-package: jdk check-latest: false server-id: github server-username: GITHUB_ACTOR server-password: GITHUB_TOKEN overwrite-settings: true job-status: success token: *** Installed distributions Trying to resolve the latest version from remote Resolved latest version as 17.0.9+9 Trying to download... Downloading Java 17.0.9+9 (Zulu) from https://cdn.azul.com/zulu/bin/zulu17.46.27-ca-crac-jdk17.0.9-linux_x64.tar.gz ... Extracting Java archive... /usr/bin/tar xz --warning=no-unknown-keyword -C /home/runner/work/_temp/773f714d-7c59-474f-a621-8c5b286e19a9 -f /home/runner/work/_temp/8a30c149-7c8d-4d3e-aa83-3b8ee6c3520e Java 17.0.9+9 was downloaded Setting Java 17.0.9+9 as the default Creating toolchains.xml for JDK version 17 from zulu Writing to /home/runner/.m2/toolchains.xml Java configuration: Distribution: zulu Version: 17.0.9+9 Path: /opt/hostedtoolcache/Java_Zulu_jdk/17.0.9-9/x64 It seems that the cause for this is the following code in SpringApplication that makes an assumption that CRaC will be used (and that org.crac.management.CRaCMXBean is available on the classpath) simply on presence of jdk.crac: