IllegalAccessError while loading ApplicationContext

[beoRich]

I am trying evaluate the hypersistence-optimizer in our spring boot hibernate application.
After following installation guide and userguide and also succesfully testing out hypersistence-optimizer-public-parent I am running into a dead end with the following error:

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [com/beontra/services/budgetforecast/common/config/TestHibernateConfig.class]: Invocation of init method failed; nested exception is java.lang.IllegalAccessError: class io.hypersistence.optimizer.hibernate.decorator.AbstractHibernate56SessionFactoryDecorator tried to access field org.hibernate.internal.FastSessionServices.eventListenerGroup_LOCK (io.hypersistence.optimizer.hibernate.decorator.AbstractHibernate56SessionFactoryDecorator and org.hibernate.internal.FastSessionServices are in unnamed module of loader 'app')
	at app//org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1786)
	at app//org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:602)
	at app//org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
	at app//org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
	at app//org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at app//org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
	at app//org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
	at app//org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1154)
	at app//org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:908)
	at app//org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
	at app//org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754)
	at app//org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434)
	at app//org.springframework.boot.SpringApplication.run(SpringApplication.java:338)
	at app//org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:123)
	at app//org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
	at app//org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
	... 85 more
Caused by: java.lang.IllegalAccessError: class io.hypersistence.optimizer.hibernate.decorator.AbstractHibernate56SessionFactoryDecorator tried to access field org.hibernate.internal.FastSessionServices.eventListenerGroup_LOCK (io.hypersistence.optimizer.hibernate.decorator.AbstractHibernate56SessionFactoryDecorator and org.hibernate.internal.FastSessionServices are in unnamed module of loader 'app')
`

Hibernate Config File:

@Configuration
@Profile("test")
public class TestHibernateConfig {

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();

        setHibernateLogLevel();
        em.setDataSource(dataSource);
        em.setPackagesToScan(
<packages>
        );

        em.setJpaPropertyMap(hibernateProperties());
        em.setPersistenceProviderClass(HibernatePersistenceProvider.class);
        em.setJpaVendorAdapter(this.jpaVendorAdapter());

        return em;
    }

    private Map<String, Object> hibernateProperties() {
        Map<String, Object> hibernateProperties = new HashMap<>();
        hibernateProperties.put("hibernate.dialect", "com.beontra.services.budgetforecast.common.config.CustomDialect");
        hibernateProperties.put("hibernate.hbm2ddl.auto", "update");
        hibernateProperties.put("hibernate.show_sql", "true");

        return hibernateProperties;
    }
}

Hypersistence Configuration:

@Configuration
@Profile("test")
public class HypersistenceConfiguration {
    @Bean
    public HypersistenceOptimizer hypersistenceOptimizer(
            EntityManagerFactory entityManagerFactory) {
        return new HypersistenceOptimizer(
                new JpaConfig(entityManagerFactory)
        );
    }
}

Gradle dependencies:
+--- org.springframework.boot:spring-boot-starter-web -> 2.5.2 ()
+--- org.springframework.boot:spring-boot-starter-data-jpa:2.6.4
| +--- org.springframework.boot:spring-boot-starter-aop:2.6.4 -> 2.5.2
| | +--- org.springframework.boot:spring-boot-starter:2.5.2 ()
| +--- org.springframework.boot:spring-boot-starter-jdbc:2.6.4 -> 2.5.2
| | +--- org.springframework.boot:spring-boot-starter:2.5.2 ()
| | +--- com.zaxxer:HikariCP:4.0.3
| | | --- org.slf4j:slf4j-api:1.7.30 -> 1.7.31
| | --- org.springframework:spring-jdbc:5.3.8
| | +--- org.springframework:spring-beans:5.3.8 ()
| | +--- org.springframework:spring-core:5.3.8 ()
| | --- org.springframework:spring-tx:5.3.8 ()
| +--- jakarta.transaction:jakarta.transaction-api:1.3.3
| +--- jakarta.persistence:jakarta.persistence-api:2.2.3
| +--- org.hibernate:hibernate-core:5.6.5.Final -> 5.4.32.Final
| | +--- org.jboss.logging:jboss-logging:3.4.1.Final -> 3.4.2.Final

and

    testImplementation 'com.h2database:h2:1.4.200'
    testImplementation "io.hypersistence:hypersistence-optimizer:2.7.1-trial"

Also tried a different configuration aproach via HibernateTransactionManagerBootstrapExecutorConfiguration and run into the same issue.

Any help or hints would be appreciated!

[vladmihalcea]

@beoRich Try running your application with java --add-opens to allow Reflection access on the Hibernate classes.

[beoRich]

Thanks for your quick response.

Tried multiple variation (gradle test config or VM Options)
--add-opens io.hypersistence.optimizer=org.hibernate.internal
--add-open =org.hibernate.internal

But the error still remains

[vladmihalcea]

@beoRich Try to replicate it on the trial branch of this repository. It has many modules, including a Spring Boot one. If you can replicate it in this repository, then I will be able to investigate it and help you find the solution to this issue.