SpringBoot Failed to run Spring Boot application in Docker container with virtual threads enabled

We tried to run sample Spring Boot web application (generated from start.spring.io) when virtual threads are enabled:

spring.threads.virtual.enabled=true

Here's Dockerfile:


FROM eclipse-temurin:21-jre-alpine
ADD target/demo-0.0.1-SNAPSHOT.jar app.jar
ENV JAVA_OPTS=""
ENTRYPOINT [ "sh", "-c", "java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -jar /app.jar" ]

However when after we build Docker image and run Docker container we got an exception on startup:

 Exception in thread "main" java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
    at java.base/java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:91)
    at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:53)
    at org.springframework.boot.loader.launch.JarLauncher.main(JarLauncher.java:54)
 Caused by: java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication$AbandonedRunException
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:332)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1336)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1325)
    at com.example.demo.DemoApplication.main(DemoApplication.java:12)
    ... 5 more
 Caused by: java.lang.ClassNotFoundException: org.springframework.boot.SpringApplication$AbandonedRunException
    at java.base/java.net.URLClassLoader.findClass(Unknown Source)
    at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
    at org.springframework.boot.loader.net.protocol.jar.JarUrlClassLoader.loadClass(JarUrlClassLoader.java:104)
    at org.springframework.boot.loader.launch.LaunchedClassLoader.loadClass(LaunchedClassLoader.java:91)
    at java.base/java.lang.ClassLoader.loadClass(Unknown Source)

If we switch off virtual threads support:

spring.threads.virtual.enabled=false

then Spring Application runs successfully inside Docker container. If we just run Spring Boot application locally (with virtual threads enabled) then everything is also fine.

Spring Boot: 3.2.0.RC1 JDK:21

Comment From: wilkinsona

It's not a perfect fit but I wonder if this is another symptom of https://github.com/spring-projects/spring-boot/issues/38050. Please try with 3.2.0-SNAPSHOT (available from https://repo.spring.io/snapshot) and let us know if that helps.

Comment From: sergey-morenets

It's not a perfect fit but I wonder if this is another symptom of #38050. Please try with 3.2.0-SNAPSHOT (available from https://repo.spring.io/snapshot) and let us know if that helps.

Hi @wilkinsona

Thank you for the quick answer. Switching to SNAPSHOT (RC2) version resolved this issue.

Comment From: wilkinsona

Great! Thanks for letting us know.