Apache OpenJPA

Apache OpenJPA comes in two separate branches, each production level material.

The differences between the two are the standards they implement. The 1.x branch follows the JSR-220 Enterprise Java Beans 3.0 specificationm while the 2.x branch was modeled after the JSR-317 Java Persistence 2.0 specification.

OpenJPA works out of the box as a persistence layer for Spring and Tomcat applications, but developers can also build it as a standalone Java library, even working in non-Java EE mediums.

A Java persistence project that can be used as a stand-alone POJO persistence layer or integrated into any Java EE compliant container and many other lightweight frameworks.

What is new in this release:

• Upgrade to ASM 4 dependency
• Speed up query metadata lookup
• Provide option to exclude schema name from generated @Table annotation for generated entities

What is new in version 2.3.0 / 1.2.3:

• Upgrade to ASM 4 dependency
• Speed up query metadata lookup
• Provide option to exclude schema name from generated @Table annotation for generated entities

What is new in version 2.1.0:

• Bugs Fixed:
• ConcurrentModificationException at org.apache.openjpa.kernel.BrokerImpl
• Insert text more than 4K bytes to Clob column causes SQLException: Exhausted Resultset
• ConcurrentModificationException with self-referring entity-class when not running the enhancer
• Generating identifiers by using sequence table may fail during sequence table initialization
• Out of bounds exception using fetch plan
• JPQL fails with Group By and Having aggregate_expression IN (subquery)
• SQL-Syntax errors with h2
• ORDER BY will append additional column to the SELECT clause which may potentialy cause ORA-00979 error
• Informix lock exceptions are not mapped properly by OpenJPA
• Typo of time data type in SQLServerdictionary for MSSQL 2008
• Improvements:
• OpenJPA doesn't meaningfully implement JDBC3, JDBC4 methods in its delegates
• Provide dictionary support for SolidDB
• Upgrade to latest commons-lang for required OSGi metadata
• Provide LRU option for L2 data cache
• Better parameter validation on StoreCache.pinAll() method
• Mapping an unsupported type
• Upgrade to latest Geronimo Specs for JPA2 and Bean Validation
• Use container-managed data sources as Slice
• Refactor property processing for distributed Slice configuration
• Update MetaDataRepository docs
• Streaming Lob support in DB2
• Use FindBugs to reduce coding errors
• New Features:
• Bean Validation sample
• Add a policy interface for targeting queries to subset of slices
• Add a policy interface for targeting finder to a subset of slices
• Produce JPA Bean Validation example and corresponding documentation
• Add support for DATETIME2 with MS SQLServer
• New OpenTrader example
• MaxDB support
• Tasks:
• Upgrade to latest JPA 2.0 TCK
• Drop JDK5 support starting with OpenJPA 2.1
• Tests:
• Need Query Engine test bucket
• Simple openjpa-xmlstore tests
• Add support to test with Apache Bean Validation provider
• CachedEntityStatistics depends on @GeneratedValue which is not supported in Oracle by default
• Update openjpa-integration-daytrader to perform user tasks
• testExternalValues failed with ORA-01438 Oracle exception
• Fix 2 test cases that cause failures on DB2 9.7

What is new in version 2.0.0:

• Bug Fixes:
• ReverseMappingTool fails for openjpa-examples/reversemapping sample
• Documentation corrections
• When batchLimit=-1 or >1 and an exception is caused, the params and failedObject are missing from the resultant exception.
• DataCacheManager initialization isn't thread safe.
• @Strategy triggers an InvalidStateException for fields which are declared as Java interfaces
• Need Compatibility setting for new OPENJPA-1097 Proxies and DetachedStateField behavior
• Cache mode properties passes in to em.find and lock methods are not transient
• Query with lock mode set to PESSIMISTIC_WRITE does not have for update clause attached to the sql when runs twice
• Setting PessimisticLockManager fails to append "for update clause" to the select statement
• ReverseMappingTool (SchemaGenerator) bug
• PESSIMISTIC_WRITE is not working in Informix
• PessimisticLockException instead of LockTimeoutException thrown on DB2V9 for ZOS
• Wrong PersistentAttributeType returned for @Embedded types
• Exception during factory creation due to javax.persistence.transactionType
• Inconsistent creation of StateManagerImpl in BrokerImpl
• NPE in MetaDataRepository when preloading is enabled under heavy stress.
• MetaDataRepository preload doesn't load JAXB meta data
• Improvements:
• Make org.apache.openjpa.persistence.meta.AnnotationProcessor6 as service
• Add new Detach processing
• Decouple the QueryCache from the DataCache
• Invoking MetaModel generator
• Output control for generated canonical metamodel source code
• Testing:
• Intermittent test failure in org.apache.openjpa.persistence.generationtype.TestGeneratedValues when running on MySQL
• Add JPQL tests for element collection
• Testcase failures in TextException on MSSQL
• Fix TestTimeoutException test failures on MSSQL and MySQL
• Fix TestTimestampVersion on various databases
• Fix TestJDBCEscapeDate test for MSSQL
• Fix TestGeneratedValues for DB2
• New tests for query qualified paths
• Fix intermittent datacache timeout failures in TestSJVMCache and CacheTest

What is new in version 1.2.2:

• Bug Fixes:
• Primary key constraint violated using (Oracle) sequence to generate ID in multithreaded app
• "Encountered unmanaged object in persistent field" error while merging object tree
• Updates to entities via Lifecycle callback methods
• @MappedSuperClass Cause Null Pointer Exception in Class With IdClass
• Several source files include Windows EoL chars
• AbstractResultList.subList throws UnsupportedOperationException
• SQLServerDictionary causes NumberFormatException if MS SQL Server JDBC driver is used
• Entities extending from a Mapped Superclass that defines the ID fields share the same ObjectID type parameter
• SetQueryTimeout(x) where x != 0 causes SQLException with DB2 on Z/OS
• NPE at org.apache.openjpa.jdbc.meta.MappingInfo.mergeJoinColumn(MappingInfo.java:1400)
• Path length issues on Windows
• NativeQueries fail with MySQL
• Shouldn't always use CAST with UPPER and LOWER for DB2
• ReverseMappingTool and SchemaTool failing for Sybase
• Move cacheable class configuration to ClassMetaData
• SQLServer driver 2.0 works, but causes exception in SQLServerDictionary on the first connection
• ClassNotFoundException for custom DBDictionary used by EJB
• NULL in columns part of an @IdClass composite key leads to "disappearing" (null) returned objects
• Unable to persist a relationship to a detached Entity
• Reduce lock contention in JDBCStoreManager
• NPE when enhancing a Serializable, versioned class
• Remove Java.net maven repostiory from tck pom.xml
• Improvements:
• Reduce synchronization bottlenecks in data cache, metadata repository, and lifecycle event manager
• Oracle needs ability to not have an escape character for search strings.
• Implement LockTimeout using db specific server-side lock timeout feature
• Add opt-in and opt-out configuration for L2 DataCache
• Add .gitignore for git users
• Use StringBuilder instead of StringBuffer in SQLBuffer
• Use java.util.concurrent.ConcurrentHashMap rather than a synchronized HashMap in ClassMapping.
• Performance improvements for detach
• Performance improvement by reduced logging of batched OLE
• Testing:
• Derby test suit speed-up
• Enable test case for jpql