SpringBoot Upgrade to MariaDB 3.1.4 - Nineya|java/go/python

Spring boot: 2.7.13

mariadb-java-client: 3.0.10

jdk version: 1.8.0_331

database config in yaml:

spring:
  datasource:
    url: jdbc:mariadb://localhost:3306/test
    username: RLYhSttVWTR6abRK
    password: IBKHOiIE1UuEteu8
    driver-class-name: org.mariadb.jdbc.Driver
  jpa:
    hibernate:
      ddl-auto: update
      naming:
        physical-strategy: org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
    properties:
      hibernate:
        dialect: org.hibernate.dialect.MariaDBDialect

Please refer to change logs(3.0.9->3.0.10) in mariadb java client---https://github.com/mariadb-corporation/mariadb-connector-j/compare/3.0.9...3.0.10

```java Properties remainingProperties = new Properties(); properties.forEach((key, val) -> remainingProperties.put(key, val));

  for (Field field : Builder.class.getDeclaredFields()) {
    if (remainingProperties.isEmpty()) break;
    for (final Object keyObj : remainingProperties.keySet()) {
      String realKey =
          OptionAliases.OPTIONS_ALIASES.get(keyObj.toString().toLowerCase(Locale.ROOT));
      if (realKey == null) realKey = keyObj.toString();
      final Object propertyValue = remainingProperties.get(keyObj);

      if (propertyValue != null && realKey != null) {
        if (realKey.toLowerCase(Locale.ROOT).equals(field.getName().toLowerCase(Locale.ROOT))) {
          field.setAccessible(true);
          remainingProperties.remove(keyObj);


**remainingProperties.remove(keyObj); // it's not allowed in jdk 8 to delete one key in for/foreach function**
It works well in jdk 11.

Exception:

2023-07-13 10:07:10.917 INFO 39420 --- [ main] com.example.demo.Demo1ApplicationTests : No active profile set, falling back to 1 default profile: "default" 2023-07-13 10:07:11.238 INFO 39420 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode. 2023-07-13 10:07:11.249 INFO 39420 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 4 ms. Found 0 JPA repository interfaces. 2023-07-13 10:07:11.739 INFO 39420 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [name: default] 2023-07-13 10:07:11.827 INFO 39420 --- [ main] org.hibernate.Version : HHH000412: Hibernate ORM core version 5.6.15.Final 2023-07-13 10:07:12.026 INFO 39420 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.1.2.Final} 2023-07-13 10:07:12.336 INFO 39420 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting... 2023-07-13 10:07:13.372 ERROR 39420 --- [ main] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Exception during pool initialization.

java.util.ConcurrentModificationException: null at java.util.Hashtable$Enumerator.next(Hashtable.java:1412) ~[na:1.8.0_331] at org.mariadb.jdbc.Configuration.mapPropertiesToOption(Configuration.java:611) ~[mariadb-java-client-3.0.10.jar:na] at org.mariadb.jdbc.Configuration.parseInternal(Configuration.java:589) ~[mariadb-java-client-3.0.10.jar:na] at org.mariadb.jdbc.Configuration.parse(Configuration.java:518) ~[mariadb-java-client-3.0.10.jar:na] at org.mariadb.jdbc.Driver.connect(Driver.java:96) ~[mariadb-java-client-3.0.10.jar:na] at org.mariadb.jdbc.Driver.connect(Driver.java:27) ~[mariadb-java-client-3.0.10.jar:na] at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138) ~[HikariCP-4.0.3.jar:na] at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:364) ~[HikariCP-4.0.3.jar:na] at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:206) ~[HikariCP-4.0.3.jar:na] at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:476) [HikariCP-4.0.3.jar:na] at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:561) [HikariCP-4.0.3.jar:na] at com.zaxxer.hikari.pool.HikariPool.(HikariPool.java:115) [HikariCP-4.0.3.jar:na] at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) [HikariCP-4.0.3.jar:na] at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:181) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:68) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:101) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:272) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:246) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:223) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.injectServices(DefaultIdentifierGeneratorFactory.java:175) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.injectDependencies(AbstractServiceRegistryImpl.java:295) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:252) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:223) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.(InFlightMetadataCollectorImpl.java:173) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:127) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1460) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1494) [hibernate-core-5.6.15.Final.jar:5.6.15.Final] at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58) [spring-orm-5.3.28.jar:5.3.28] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) [spring-orm-5.3.28.jar:5.3.28] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:409) [spring-orm-5.3.28.jar:5.3.28] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396) [spring-orm-5.3.28.jar:5.3.28] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) [spring-orm-5.3.28.jar:5.3.28] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1863) [spring-beans-5.3.28.jar:5.3.28] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1800) [spring-beans-5.3.28.jar:5.3.28] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:620) [spring-beans-5.3.28.jar:5.3.28] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) [spring-beans-5.3.28.jar:5.3.28] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) [spring-beans-5.3.28.jar:5.3.28] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.28.jar:5.3.28] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) [spring-beans-5.3.28.jar:5.3.28] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) [spring-beans-5.3.28.jar:5.3.28] at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1156) ~[spring-context-5.3.28.jar:5.3.28] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:910) ~[spring-context-5.3.28.jar:5.3.28] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.28.jar:5.3.28] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:731) ~[spring-boot-2.7.13.jar:2.7.13] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) ~[spring-boot-2.7.13.jar:2.7.13] at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) ~[spring-boot-2.7.13.jar:2.7.13] at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:136) ~[spring-boot-test-2.7.13.jar:2.7.13] at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:141) ~[spring-test-5.3.28.jar:5.3.28] at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:90) ~[spring-test-5.3.28.jar:5.3.28] at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:124) ~[spring-test-5.3.28.jar:5.3.28] at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:118) ~[spring-test-5.3.28.jar:5.3.28] at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83) ~[spring-test-5.3.28.jar:5.3.28] at org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener.prepareTestInstance(SpringBootDependencyInjectionTestExecutionListener.java:43) ~[spring-boot-test-autoconfigure-2.7.13.jar:2.7.13] at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:248) ~[spring-test-5.3.28.jar:5.3.28] at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:138) ~[spring-test-5.3.28.jar:5.3.28] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$8(ClassBasedTestDescriptor.java:363) ~[junit-jupiter-engine-5.8.2.jar:5.8.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.executeAndMaskThrowable(ClassBasedTestDescriptor.java:368) ~[junit-jupiter-engine-5.8.2.jar:5.8.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$9(ClassBasedTestDescriptor.java:363) ~[junit-jupiter-engine-5.8.2.jar:5.8.2] at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[na:1.8.0_331] at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[na:1.8.0_331] at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1384) ~[na:1.8.0_331] at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) ~[na:1.8.0_331] at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) ~[na:1.8.0_331] at java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:312) ~[na:1.8.0_331] at java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:743) ~[na:1.8.0_331] at java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:742) ~[na:1.8.0_331] at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580) ~[na:1.8.0_331] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeTestInstancePostProcessors(ClassBasedTestDescriptor.java:362) ~[junit-jupiter-engine-5.8.2.jar:5.8.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$instantiateAndPostProcessTestInstance$6(ClassBasedTestDescriptor.java:283) ~[junit-jupiter-engine-5.8.2.jar:5.8.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.instantiateAndPostProcessTestInstance(ClassBasedTestDescriptor.java:282) ~[junit-jupiter-engine-5.8.2.jar:5.8.2] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$4(ClassBasedTestDescriptor.java:272) ~[junit-jupiter-engine-5.8.2.jar:5.8.2] at java.util.Optional.orElseGet(Optional.java:267) ~[na:1.8.0_331] at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$5(ClassBasedTestDescriptor.java:271) ~[junit-jupiter-engine-5.8.2.jar:5.8.2] at org.junit.jupiter.engine.execution.TestInstancesProvider.getTestInstances(TestInstancesProvider.java:31) ~[junit-jupiter-engine-5.8.2.jar:5.8.2] at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$prepare$0(TestMethodTestDescriptor.java:102) ~[junit-jupiter-engine-5.8.2.jar:5.8.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:101) ~[junit-jupiter-engine-5.8.2.jar:5.8.2] at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:66) ~[junit-jupiter-engine-5.8.2.jar:5.8.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$prepare$2(NodeTestTask.java:123) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.prepare(NodeTestTask.java:123) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:90) ~[junit-platform-engine-1.8.2.jar:1.8.2] at java.util.ArrayList.forEach(ArrayList.java:1259) ~[na:1.8.0_331] at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95) ~[junit-platform-engine-1.8.2.jar:1.8.2] at java.util.ArrayList.forEach(ArrayList.java:1259) ~[na:1.8.0_331] at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:35) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:54) ~[junit-platform-engine-1.8.2.jar:1.8.2] at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:220) ~[junit-platform-launcher-1.3.1.jar:1.3.1] at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:188) ~[junit-platform-launcher-1.3.1.jar:1.3.1] at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:202) ~[junit-platform-launcher-1.3.1.jar:1.3.1] at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:181) ~[junit-platform-launcher-1.3.1.jar:1.3.1] at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128) ~[junit-platform-launcher-1.3.1.jar:1.3.1] at org.apache.maven.surefire.junitplatform.JUnitPlatformProvider.invokeAllTests(JUnitPlatformProvider.java:150) ~[surefire-junit-platform-2.22.2.jar:2.22.2] at org.apache.maven.surefire.junitplatform.JUnitPlatformProvider.invoke(JUnitPlatformProvider.java:124) ~[surefire-junit-platform-2.22.2.jar:2.22.2] at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384) ~[surefire-booter-2.22.2.jar:2.22.2] at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345) ~[surefire-booter-2.22.2.jar:2.22.2] at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126) ~[surefire-booter-2.22.2.jar:2.22.2] at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418) ~[surefire-booter-2.22.2.jar:2.22.2]

2023-07-13 10:07:13.376 WARN 39420 --- [ main] o.h.e.j.e.i.JdbcEnvironmentInitiator : HHH000342: Could not obtain connection to query metadata





**Comment From: wilkinsona**

This appears to be due to https://github.com/mariadb-corporation/mariadb-connector-j/commit/1d9bee54ea2f30edecbf005e018d0f208bd87557 which is out of Spring Boot's control. Please report the problem to the maintainers of mariadb-connector-j. In the meantime, you can use `mariadb.version` to specify a version that meets your project's needs.

**Comment From: walterFor**

> This appears to be due to [mariadb-corporation/mariadb-connector-j@1d9bee5](https://github.com/mariadb-corporation/mariadb-connector-j/commit/1d9bee54ea2f30edecbf005e018d0f208bd87557) which is out of Spring Boot's control. Please report the problem to the maintainers of mariadb-connector-j. In the meantime, you can use `mariadb.version` to specify a version that meets your project's needs.

yes, of course, it can be overrided as you mentioned. But 3.0.10 is included by spring boot 2.7.13 by default and spring claimed responsibility for compatibility of jdk 1.8. So is it possible to choose one available mariadb client version for jdk 1.8?

**Comment From: wilkinsona**

I'm afraid not, no. We don't want to get stuck on an old version of the MariaDB JDBC driver so downgrading the dependency for everyone isn't something that we will do. The MariaDB JDBC driver [should be compatible with Java 8](https://mariadb.com/kb/en/about-mariadb-connector-j/) (for 3.1.x as well as 3.0.x). Until that incompatibility has been fixed, you should downgrade as needed.

**Comment From: walterFor**

> I'm afraid not, no. We don't want to get stuck on an old version of the MariaDB JDBC driver so downgrading the dependency for everyone isn't something that we will do. The MariaDB JDBC driver [should be compatible with Java 8](https://mariadb.com/kb/en/about-mariadb-connector-j/) (for 3.1.x as well as 3.0.x). Until that incompatibility has been fixed, you should downgrade as needed.

Hi @wilkinsona ,
I opened one ticket to mariadb client: https://jira.mariadb.org/browse/CONJ-1089
They suggest that 3.1.x being now the supported version for java 8 of 3.x branch, so please adopt 3.1.x in next spring boot 2.7.15 release.

By the way, 3.0.10 is removed from official website https://mariadb.com/kb/en/about-mariadb-connector-j/

![image](https://github.com/spring-projects/spring-boot/assets/26076014/991a2f90-534b-4245-b711-dcfca5261308)



**Comment From: wilkinsona**

Thanks for the additional information. Generally speaking, [we don't upgrade dependencies to new minor versions in maintenance releases of Spring Boot](https://github.com/spring-projects/spring-boot/wiki/Team-Practices#third-party-dependency-upgrades). However, if 3.0.10 is unusable with Java 8, I wonder if we should make an exception in this case. I'll discuss it with the rest of the team.

**Comment From: philwebb**

I'm tempted to say we should make an exception since things seem quite broken if we stay on 3.0.10. We'd have to call it out in the release notes so folks can downgrade if they wish.

**Comment From: wilkinsona**

We decided to make an exception and upgrade to 3.1.4 in Spring Boot 2.7.x and 3.0.x. Spring Boot 3.1.x has already upgraded.

**Comment From: tofi86**

Just wanted to let you know that this MariaDB upgrade in Spring Boot 2.7.15 causes a major problem with Hibernate type mappings in native query projections for the MariaDB 10.7 datatype `UUID` due to the following breaking change in MariaDB Java Connector v3.1.0: https://mariadb.com/kb/en/mariadb-connector-j-3-1-0-release-notes/#uuid-object-support

This is the error:

org.springframework.orm.jpa.JpaSystemException: No Dialect mapping for JDBC type: 1111; nested exception is org.hibernate.MappingException: No Dialect mapping for JDBC type: 1111 ```

It occurs when upgrading Spring Boot 2.7.14 to 2.7.15 (or higher) with a native query selecting a MariaDB UUID column and mapping it to an interface projection with the field declared as native java UUID type – which hasn't been a problem before.

Also, the MariaDB Java Connector 3.0.x series has been updated in the meantime to fix the Java 8 issue: https://mariadb.com/kb/en/mariadb-connector-j-3-0-11-release-notes/

I suppose, downgrading the MariaDB Java Connector in Spring Boot 2.7 isn't an option anymore?

For those stumbling upon this issue as well, you have two options:

Manually downgrade the mariadb.version to 3.0.10 (from Spring Boot 2.7.14) or 3.0.11
Adding a new JDBC connection option to your datasource url: spring.datasource.url=jdbc:mariadb://host:port/database_name?uuidAsString=true

Comment From: wilkinsona

Thanks for the additional info, @tofi86. Unfortunately, we weren't really left with any good options here and tried to pick the least bad of them. As you've noted above, you're free to downgrade to 3.0.x if that's a better fit for your needs. I've updated the changelog for 2.7.15 to this effect as we had missed calling this out as a noteworthy change.

Comment From: tofi86

Alright, thanks for updating the release notes, @wilkinsona!

Comment From: Polve

current mariadb connector is 3.3.2 while the just released boot 3.2.1 includes mariadb connector 3.2.0: is there a reason for this or I can file a bug asking to update the dependency in the future?

Comment From: bclozel

@Polve mariadb connector 3.3.0 is only a month old or so. But it seems there's only been a single 3.2.0 and no maintenance version released since... We'll certainly upgrade in Spring Boot 3.3.0 but I think it's worth raising the point to the team. I've created #38901