Document with LocalDateTime field doesn't work in Java 17

[adubrov]

Migrated very simple java application from Java 11 to Java 17. Have singe Document

@Document
@Data
@NoArgsConstructor
public class SyncTask {

  @Id
  private ObjectId id;

  @Indexed
  private String taskId;
  
  private LocalDateTime startedOn;

}

And getting issue on start up

Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make private java.time.LocalDateTime(java.time.LocalDate,java.time.LocalTime) accessible: module java.base does not "opens java.time" to unnamed module @757acd7b
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
	at java.base/java.lang.reflect.Constructor.checkCanSetAccessible(Constructor.java:188)
	at java.base/java.lang.reflect.Constructor.setAccessible(Constructor.java:181)
	at org.springframework.util.ReflectionUtils.makeAccessible(ReflectionUtils.java:202)
	at org.springframework.data.mapping.PreferredConstructor.<init>(PreferredConstructor.java:53)
	at org.springframework.data.mapping.model.PreferredConstructorDiscoverer$Discoverers.buildPreferredConstructor(PreferredConstructorDiscoverer.java:224)
	at org.springframework.data.mapping.model.PreferredConstructorDiscoverer$Discoverers.access$200(PreferredConstructorDiscoverer.java:93)
	at org.springframework.data.mapping.model.PreferredConstructorDiscoverer$Discoverers$1.discover(PreferredConstructorDiscoverer.java:136)
	at org.springframework.data.mapping.model.PreferredConstructorDiscoverer.discover(PreferredConstructorDiscoverer.java:81)
	at org.springframework.data.mapping.model.InstanceCreatorMetadataDiscoverer.discover(InstanceCreatorMetadataDiscoverer.java:83)
	at org.springframework.data.mapping.model.BasicPersistentEntity.<init>(BasicPersistentEntity.java:113)
	at org.springframework.data.mongodb.core.mapping.BasicMongoPersistentEntity.<init>(BasicMongoPersistentEntity.java:84)
	at org.springframework.data.mongodb.core.mapping.MongoMappingContext.createPersistentEntity(MongoMappingContext.java:100)
	at org.springframework.data.mongodb.core.mapping.MongoMappingContext.createPersistentEntity(MongoMappingContext.java:41)
	at org.springframework.data.mapping.context.AbstractMappingContext.doAddPersistentEntity(AbstractMappingContext.java:430)
	at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:406)
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.lambda$createAndRegisterProperty$3(AbstractMappingContext.java:630)
	at java.base/java.lang.Iterable.forEach(Iterable.java:75)
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.createAndRegisterProperty(AbstractMappingContext.java:627)
	at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.doWith(AbstractMappingContext.java:581)
	at org.springframework.util.ReflectionUtils.doWithFields(ReflectionUtils.java:714)
	at org.springframework.data.mapping.context.AbstractMappingContext.doAddPersistentEntity(AbstractMappingContext.java:449)
	at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:406)
	at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:291)
	at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:209)
	at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:92)
	at org.springframework.data.mapping.context.MappingContext.getRequiredPersistentEntity(MappingContext.java:74)
	at org.springframework.data.mongodb.repository.support.MongoRepositoryFactory.getEntityInformation(MongoRepositoryFactory.java:166)
	at org.springframework.data.mongodb.repository.support.MongoRepositoryFactory.getTargetRepository(MongoRepositoryFactory.java:140)
	at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:325)
	at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$5(RepositoryFactoryBeanSupport.java:323)
	at org.springframework.data.util.Lazy.getNullable(Lazy.java:231)
	at org.springframework.data.util.Lazy.get(Lazy.java:115)
	at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:329)
	at org.springframework.data.mongodb.repository.support.MongoRepositoryFactoryBean.afterPropertiesSet(MongoRepositoryFactoryBean.java:119)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1863)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1800)
	... 44 common frames omitted

Obviously related to this change - https://openjdk.org/jeps/396
If I remove LocalDateTime field - it starts without issue.

[christophstrobl]

I might be missing something here. A fresh boot 3.0.5 project with the above entity works just fine on openjdk version "17.0.4.1".
Maybe you can take the time to provide a complete minimal sample (something that we can unzip or git clone, build, and deploy) that reproduces the problem.

[vikas-singh-maersk]

Hi @christophstrobl ,
I'm using boot 3.0.5 project with java version 17.0.6.When I'm trying to start the service I'm getting above mentioned exception. I'm using two mongo Db and did the configuration for that and using custom converters. It was working fine in java 11 but after upgrading it to 17, I started facing above exception.

[christophstrobl]

@vikas-singh-maersk do you have a minimal sample (something that we can unzip or git clone, build, and deploy) that reproduces the problem at hand?

[vikas-singh-maersk]

Hi @christophstrobl ,
I have to create the minimal sample to share with you. But I have found the cause of issue. As I mentioned earlier I'm using 2 mongo DB Connection in my project and for that I'm using @EnableMongoRepositories annotation. This annotation is creating problem to access Localdatetime. If I'll remove this annotation my code works fine.
It seems like @EnableMongoRepositories annotation internally uses the MongoRepositoriesRegistrar class, which tries to create a MappingContext instance using the LocalDateTime class. Can you look into it ?

[christophe-michard]

Hi, @christophstrobl

I also faced the kind of issue reported in this ticket, when trying to update a project to Spring Boot 3+.
It is likely due to the use of ReflectionUtils.makeAccessible from spring-core, that uses setAccessible(true) internally.
Background: https://mail.openjdk.org/pipermail/jdk9-dev/2016-November/005276.html

Here is a minimal sample to reproduce the crash: https://github.com/christophe-michard/MongoSetAccessibleIssue.

Important part:

@SpringBootApplication
public class MongoSetAccessibleIssueApplication {

    public static void main(String[] args) {
        SpringApplication.run(MongoSetAccessibleIssueApplication.class, args);
    }

    public MongoSetAccessibleIssueApplication() {
        // Create a custom mongoTemplate
        // Crash happens only if we create a template with the mappingMongoConverter as second argument
        MongoDatabaseFactory mongoDbFactory = new SimpleMongoClientDatabaseFactory(MongoClients.create(), "db");
        MappingMongoConverter mappingMongoConverter = new MappingMongoConverter(new DefaultDbRefResolver(mongoDbFactory), new MongoMappingContext());
        MongoTemplate mongoTemplate = new MongoTemplate(mongoDbFactory, mappingMongoConverter);

        // Crash happens when this line is executed
        mongoTemplate.save(new MongoEntity());
    }
}

class MongoEntity {

    // We need a field that is a class from java.time package, for instance Instant, to provoke a crash.
    // Background: https://mail.openjdk.org/pipermail/jdk9-dev/2016-November/005276.html
    // Crash sample:
    //   Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make private java.time.Instant(long,int) accessible: module java.base does not "opens java.time" to unnamed module @1afd44cb
    // 	   at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354) ~[na:na]
    //	   at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) ~[na:na]
    //	   at java.base/java.lang.reflect.Constructor.checkCanSetAccessible(Constructor.java:188) ~[na:na]
    //	   at java.base/java.lang.reflect.Constructor.setAccessible(Constructor.java:181) ~[na:na]
    //	   at org.springframework.util.ReflectionUtils.makeAccessible(ReflectionUtils.java:201) ~[spring-core-6.0.9.jar:6.0.9]
    //     at org.springframework.data.mapping.PreferredConstructor.<init>(PreferredConstructor.java:56) ~[spring-data-commons-3.1.0.jar:3.1.0]
    public Instant createdDateTime;
}

Is it enough for you to be able to investigate on the issue? 😃

[christophstrobl]

@christophe-michard thanks for the reproducer!