I have a simple application built on top of org.springframework.boot:spring-boot-starter-parent version 2.5.4-SNAPSHOT and some derived dependencies: org.springframework.boot:spring-boot-starter-data-r2dbc org.springframework.boot:spring-boot-starter-webflux org.springframework.boot:spring-boot-starter-actuator io.r2dbc:r2dbc-postgresql I use org.springframework.experimental:spring-native version 0.10.3 to enable Spring Native and build using the following plugin: I build the image using ./mvnw.cmd spring-boot:build-image -Pnative-docker -DskipTests, I get assured Java 16 is bootstrapped correctly, and then the image exists (why it is

Spring Boot Docker Native image of Spring R2DBC application on Java 16 fails on unsupported methdod

I have a simple application built on top of org.springframework.boot:spring-boot-starter-parent version 2.5.4-SNAPSHOT and some derived dependencies:

org.springframework.boot:spring-boot-starter-data-r2dbc
org.springframework.boot:spring-boot-starter-webflux
org.springframework.boot:spring-boot-starter-actuator
io.r2dbc:r2dbc-postgresql

I use org.springframework.experimental:spring-native version 0.10.3 to enable Spring Native and build using the following plugin:

<properties>
    <java.version>16</java.version>
</properties>

<!-- native-docker profile -->
<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <configuration>
        <image>
            <builder>paketobuildpacks/builder:tiny</builder>
            <env>
                <BP_BOOT_NATIVE_IMAGE>1</BP_BOOT_NATIVE_IMAGE>
            </env>
        </image>
        <fork>false</fork>
        <jvmArguments>--enable-preview</jvmArguments>
    </configuration>
</plugin>

I build the image using ./mvnw.cmd spring-boot:build-image -Pnative-docker -DskipTests, I get assured Java 16 is bootstrapped correctly, and then the image exists (why it is 41 years old, I have no clue).

[INFO]     [creator]     Paketo GraalVM Buildpack 6.4.2
[INFO]     [creator]       https://github.com/paketo-buildpacks/graalvm
[INFO]     [creator]       Build Configuration:
[INFO]     [creator]         $BP_JVM_VERSION            16.*           the Java version

$ docker images
REPOSITORY                  TAG              IMAGE ID       CREATED        SIZE
...
myapplication               0.0.1-SNAPSHOT   9bdb55e635ab   41 years ago   128MB

After the image is created using, I use docker-compose up to start up the database and then the application (this works as I previously built an image normally using Dockerfile and started together) and the following exception is raised and the Spring Boot application won’t start:

myapplication | Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'partyRepository' defined in com.myapplication.repository.MyFirstRepository defined in @EnableR2dbcRepositories declared on R2dbcRepositoriesAutoConfigureRegistrar.EnableR2dbcRepositoriesConfiguration: Invocation of init method failed; nested exception is com.oracle.svm.core.jdk.UnsupportedFeatureError: Unsupported method java.lang.Class.isSealed() is reachable: The declaring class of this element has been substituted, but this element is not present in the substitution class
myapplication |     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1786) ~[na:na]
myapplication |     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:602) ~[na:na]
myapplication |     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[na:na]
myapplication |     at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[na:na]
myapplication |     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[na:na]
myapplication |     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[na:na]
myapplication |     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[na:na]
myapplication |     at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[na:na]
myapplication |     at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380) ~[na:na]
myapplication |     at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[na:na]
myapplication |     at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887) ~[na:na]
myapplication |     at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[na:na]
myapplication |     ... 19 common frames omitted
myapplication | Caused by: com.oracle.svm.core.jdk.UnsupportedFeatureError: Unsupported method java.lang.Class.isSealed() is reachable: The declaring class of this element has been substituted, but this element is not present in the substitution class

I assume R2DBC somehow uses Class#isSealed which is in the enable preview mode in Java 16. How to make it run?

Answer

For this problem, there has been reported a bug #3870 afterwards on the Oracle/Graal project reproducible on GraalVM 21.3.

The issue is waiting for its resolution.

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Answer