SpringBoot Dependency Issue on spring-boot-starter-parent: NoClassDefFoundError for ThreadLocalAccessor

Dependency Issue: NoClassDefFoundError for ThreadLocalAccessor

Try to build a new application with version:

        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.0.8</version>

On a build, it throws the following exception:

Caused by: java.lang.NoClassDefFoundError: io/micrometer/context/ThreadLocalAccessor
    at java.base/java.lang.ClassLoader.defineClass1(Native Method)
    at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1013)
    at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
    at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:862)
    at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:760)
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:681)
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:639)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    at java.base/java.lang.Class.forName0(Native Method)
    at java.base/java.lang.Class.forName(Class.java:496)
    at java.base/java.lang.Class.forName(Class.java:475)
    at org.springframework.test.context.observation.MicrometerObservationRegistryTestExecutionListener.<clinit>(MicrometerObservationRegistryTestExecutionListener.java:76)
    ... 65 common frames omitted
Caused by: java.lang.ClassNotFoundException: io.micrometer.context.ThreadLocalAccessor
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    ... 78 common frames omitted

Temporarily solution available: Add required micrometer depencies in classpath/maven pom xml or specify custom test execution listeners.

Build Environment Versions: Java/JDK Version: 20.0.1 Maven: apache-maven-3.9.2 spring-boot-starter-parent: 3.0.8

Comment From: wilkinsona

Duplicates https://github.com/spring-projects/spring-framework/issues/30726 and https://github.com/spring-projects/spring-framework/issues/30747. If an upgrade to Spring Framework 6.0.11-SNAPSHOT (available from https://repo.spring-io/snapshot) does not help, please open a Spring Framework issue.

Comment From: rajagopalanvivek

Thank you. Glad to hear that the defect is already fixed, and will be available in upcoming releases.