spring data spanner entities and repositories need to be public when compiling in graalvm native images

[joshlong]

for some reason the graalvm native image AOT compilation fails if the google cloud data spanner entities and repositories are nto public. this occurs when i go to start.spring.io and build a project with the following pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>3.3.4</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>service</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>service</name>
	<description>Demo project for Spring Boot</description>
	<url/>
	<licenses>
		<license/>
	</licenses>
	<developers>
		<developer/>
	</developers>
	<scm>
		<connection/>
		<developerConnection/>
		<tag/>
		<url/>
	</scm>
	<properties>
		<java.version>21</java.version>
		<spring-ai.version>1.0.0-M3</spring-ai.version>
		<spring-cloud-gcp.version>5.7.0</spring-cloud-gcp.version>
		<spring-cloud.version>2023.0.3</spring-cloud.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>com.google.cloud</groupId>
			<artifactId>spring-cloud-gcp-starter</artifactId>
		</dependency>
		<dependency>
			<groupId>com.google.cloud</groupId>
			<artifactId>spring-cloud-gcp-starter-pubsub</artifactId>
		</dependency>
		<dependency>
			<groupId>com.google.cloud</groupId>
			<artifactId>spring-cloud-gcp-starter-storage</artifactId>
		</dependency>
	<!--	<dependency>
			<groupId>org.springframework.ai</groupId>
			<artifactId>spring-ai-pgvector-store-spring-boot-starter</artifactId>
		</dependency>-->
		<dependency>
			<groupId>org.springframework.ai</groupId>
			<artifactId>spring-ai-vertex-ai-gemini-spring-boot-starter</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-stream</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		
		<dependency>
			<groupId>com.google.cloud</groupId>
			<artifactId>spring-cloud-gcp-starter-data-spanner</artifactId>
		</dependency>
		
		
<!--		-->


		<!--   -->
	 
		<!--        <dependency>
                    <groupId>org.springframework.ai</groupId>
                    <artifactId>spring-ai-pgvector-store-spring-boot-starter</artifactId>
                </dependency>-->
		<dependency>
			<groupId>com.google.cloud</groupId>
			<artifactId>spring-cloud-gcp-vision</artifactId>
		</dependency>
		
		
	</dependencies>
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>${spring-cloud.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
			<dependency>
				<groupId>org.springframework.ai</groupId>
				<artifactId>spring-ai-bom</artifactId>
				<version>${spring-ai.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
			<dependency>
				<groupId>com.google.cloud</groupId>
				<artifactId>spring-cloud-gcp-dependencies</artifactId>
				<version>${spring-cloud-gcp.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<build>
		<plugins>
			<plugin>
				<groupId>org.graalvm.buildtools</groupId>
				<artifactId>native-maven-plugin</artifactId>
			</plugin>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
	<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>

</project>

here's the error log.

...
[INFO] 
[INFO] --- resources:3.3.1:resources (default-resources) @ service ---
[INFO] Copying 1 resource from src/main/resources to target/classes
[INFO] Copying 1 resource from src/main/resources to target/classes
[INFO] 
[INFO] --- compiler:3.13.0:compile (default-compile) @ service ---
[INFO] Recompiling the module because of changed source code.
[INFO] Compiling 3 source files with javac [debug parameters release 21] to target/classes
[INFO] 
[INFO] --- resources:3.3.1:testResources (default-testResources) @ service ---
[INFO] skip non existing resourceDirectory /Users/jlong/Desktop/gcp-webinar/service/src/test/resources
[INFO] 
[INFO] --- compiler:3.13.0:testCompile (default-testCompile) @ service ---
[INFO] Recompiling the module because of changed dependency.
[INFO] Compiling 1 source file with javac [debug parameters release 21] to target/test-classes
[INFO] 
[INFO] --- surefire:3.2.5:test (default-test) @ service ---
[WARNING]  Parameter 'systemProperties' is deprecated: Use systemPropertyVariables instead.
[INFO] Tests are skipped.
[INFO] 
[INFO] --- spring-boot:3.3.4:process-aot (process-aot) @ service ---
Standard Commons Logging discovery in action with spring-jcl: please remove commons-logging.jar from classpath in order to avoid potential conflicts

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/

 :: Spring Boot ::                (v3.3.4)

2024-10-21T18:17:33.941+03:00  INFO 18298 --- [           main] com.example.service.ServiceApplication   : Starting ServiceApplication using Java 23 with PID 18298 (/Users/jlong/Desktop/gcp-webinar/service/target/classes started by jlong in /Users/jlong/Desktop/gcp-webinar/service)
2024-10-21T18:17:33.945+03:00  INFO 18298 --- [           main] com.example.service.ServiceApplication   : No active profile set, falling back to 1 default profile: "default"
2024-10-21T18:17:34.264+03:00  INFO 18298 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data Spanner repositories in DEFAULT mode.
2024-10-21T18:17:34.316+03:00  INFO 18298 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 49 ms. Found 1 Spanner repository interface.
2024-10-21T18:17:34.403+03:00  INFO 18298 --- [           main] faultConfiguringBeanFactoryPostProcessor : No bean named 'errorChannel' has been explicitly defined. Therefore, a default PublishSubscribeChannel will be created.
2024-10-21T18:17:34.406+03:00  INFO 18298 --- [           main] faultConfiguringBeanFactoryPostProcessor : No bean named 'integrationHeaderChannelRegistry' has been explicitly defined. Therefore, a default DefaultHeaderChannelRegistry will be created.
2024-10-21T18:17:34.846+03:00  INFO 18298 --- [           main] o.s.c.s.b.BinderChildContextInitializer  : Beginning AOT processing for binder child contexts
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  4.730 s
[INFO] Finished at: 2024-10-21T18:17:36+03:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:3.3.4:process-aot (process-aot) on project service: Unable to compile generated source
[ERROR] com.example.service.Dog is not public in com.example.service; cannot be accessed from outside package /Users/jlong/Desktop/gcp-webinar/service/target/spring-aot/main/sources/com/google/cloud/spring/data/spanner/repository/support/SpannerRepositoryFactoryBean__BeanDefinitions.java 3:27
[ERROR] com.example.service.DogRepository is not public in com.example.service; cannot be accessed from outside package /Users/jlong/Desktop/gcp-webinar/service/target/spring-aot/main/sources/com/google/cloud/spring/data/spanner/repository/support/SpannerRepositoryFactoryBean__BeanDefinitions.java 4:27
[ERROR] com.example.service.DogRepository is not public in com.example.service; cannot be accessed from outside package /Users/jlong/Desktop/gcp-webinar/service/target/spring-aot/main/sources/com/google/cloud/spring/data/spanner/repository/support/SpannerRepositoryFactoryBean__BeanDefinitions.java 34:106
[ERROR] com.example.service.Dog is not public in com.example.service; cannot be accessed from outside package /Users/jlong/Desktop/gcp-webinar/service/target/spring-aot/main/sources/com/google/cloud/spring/data/spanner/repository/support/SpannerRepositoryFactoryBean__BeanDefinitions.java 34:127

this doesn't occur for other spring data modules.