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

[rajagopalanvivek]

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

[wilkinsona]

Duplicates spring-projects/spring-framework#30726 and spring-projects/spring-framework#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.

[rajagopalanvivek]

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