:star: New features

• Add support for MongoDB as JobRepository #877
• Introduce a resourceless job repository implementation #4679
• Add adapters for Java functional interfaces #4672
• Add ability to customize the job parameters converter in the default batch configuration #4650
• Add CompositeItemReader analogous to CompositeItemWriter and CompositeItemProcessor #757
• Allow dependent steps to start concurrently #2044
• Add blocking queue item reader/writer to enable implementing the staged event-driven architecture in batch jobs #2350
• Add support for data classes in JdbcCursorItemReaderBuilder & JdbcPagingItemReaderBuilder [#4578]
• Add support for query hints in JPA item readers [#4479]
• Add possibility to configure line separator in RecursiveCollectionLineAggregator [#4594]
• Add JobRegistrySmartInitializingSingleton [#4521]
• Add DatabaseType POSTGRES for the product name EnterpriseDB #4627
• Revisit the mechanism of job registration [#4547]

:lady_beetle: Bug fixes

• Incorrect bean configuration in DefaultBatchConfiguration [#4543]
• BeanPostProcessorChecker.postProcessAfterInitialization WARNING after upgrade spring-framework-6.1.0 [#4489]
• Possible duplicate state transitions in flow definition [#3674]
• Order of Transition Elements Still Does Not completely adhere to documentation [#3996]
• Memory leak in MessageChannelPartitionHandler when polling the database [#4598]
• ListItemWriter<T>::getWrittenItems has bad wildcard return type [#4576]
• SimpleBinaryBufferedReaderFactory misses line endings [#811]
• StepExecution.getEndTime() returns null in StepExecutionListener.afterStep() [#3846]
• Default value for ignoreWarnings in JdbcCursorItemReaderBuilder does not align with documentation [#4570]
• Remote partitioning doesn't work if you're using graalvm [#4564]
• SystemCommandTasklet does not propagate errors [#4483]
• Incorrect Chunk property value in implementation of ItemWriter write method [#4560]
• Incorrect step configuration when setting the taskExecutor before faultTolerant() [#4438]
• Incorrect deprecation in MongoPagingItemReader [#4552]
• JobRepository.deleteJobInstance() Fails with Foreign Key Constraint Violation if Job Executions have Step Executions [#4382]
• DefaultJobParametersConverter throws java.lang.ArrayIndexOutOfBoundsException if input is empty string [#4505]
• Wrong column types in JdbcStepExecutionDao [#4648]
• MongoStepExecutionDao returns an different stepExecution if a job has multiple steps spring-projects-experimental/spring-batch-experimental/issues/3

:rocket: Enhancements

• Bad performance of GET_LAST_STEP_EXECUTION query on DB2 with large STEP_EXECUTION table #4657
• Use Threadlocal.remove() instead of Threadlocal.set(null) [#4601]
• Performance issue in DefaultFieldSet due to the usage of SimpleDateFormat [#1694]
• Improve Error Messages in JobParametersBuilder methods [#4581]
• Implement jumpToItem in JsonItemReader [#4557]
• Maintain similar ordering of elements between DefaultStateTransitionComparator and FlowJobBuilder [#4527]
• Avoid collection copying [#4553]
• Make util classes to follow code style guide [#4545]
• Use annotation @Override consistently [#4512]
• Check dirty flag of step execution context before update in inner loop [#4503]
• Missing @FunctionalInterface in JobKeyGenerator [#4613]
• Proper default value for skipLimit [#4661]

:notebook_with_decorative_cover: Documentation

• Flow order priority does not match documented behavior [#4456]
• Incorrect link to batch reference documentation on project page [#4637]
• Typo in architecture doc [#4607]
• Grammatical error in restart.adoc [#4600]
• Incorrect link in appendix [#4595]
• Missing information about error handling in ChunkListeners [#4384]
• Improve Javadoc regarding the sort order in RepositoryItemReader [#4462]
• Fix code sample that uses deprecated StepBuilderFactory [#4582]
• Misleading documentation on ItemWriteListener [#4400]
• Incorrect code example in documentation [#4550]
• Reference Documentation Uses Deprecated Class StepExecutionListenerSupport [#4538]
• Incorrect Type of getter in Documentation for JobParameters#getDouble [#4526]
• UI Aligment Issue - Spring Batch Version Number in Docs [#4534]
• Missing documentation about MultiResourceItemWriter not creating empty files when no data goes through delegates [#4645]
• Typo in the documentation chapter Spring Batch Integration [#4649]

🆙 Dependency Upgrades

• Spring Framework: 6.2.0
• Spring Retry: 2.0.10
• Micrometer: 1.14.1
• Spring Integration: 6.4.0
• Spring AMQP: 3.2.0
• Spring Kafka: 3.3.0
• Spring Data: 3.4.0
• Spring Ldap: 3.2.8

:hammer: Tasks

• Deprecate the usage of LobHandler #4588
• Deprecate SystemPropertyInitializer #4680
• Remove deprecated APIs scheduled for removal in v5.2.0 [#4398]
• Regression in javadocs deployment script [#4511]

:heart: Contributors

Many thanks to all contributors who worked on this release!

Full change log: https://github.com/spring-projects/spring-batch/compare/v5.1.2...v5.2.0