Packages 
Package Description
org.datanucleus
This package provides classes that are typically externally called, whether that means by developers or by other DataNucleus plugins.
org.datanucleus.api
Provides adapters for different client APIs, like JDO, JPA and so on.
org.datanucleus.cache
This package provides classes implementing L1/L2 persistable object caching within DataNucleus.
org.datanucleus.enhancement
DataNucleus ByteCode enhancement contract.
org.datanucleus.enhancer
DataNucleus ByteCode enhancer framework.
org.datanucleus.enhancer.asm
ASM : a small and fast bytecode manipulation framework.
org.datanucleus.enhancer.methods
Method enhancements for supporting the org.datanucleus.enhancement.Persistable bytecode enhancement contract.
org.datanucleus.exceptions
This package provides exceptions thrown by the core (client-facing) parts of DataNucleus.
org.datanucleus.flush
This package provides classes managing the flush process when using MANUAL flush.
org.datanucleus.identity
Package defining object identity classes.
org.datanucleus.management
This package provides classes for management/monitoring of DataNucleus enabled applications via API or JMX.
org.datanucleus.metadata
Provides classes representing the MetaData for files, packages, classes, fields, containers, etc.
org.datanucleus.metadata.annotations
Provides classes for parsing annotations input data and converting into org.datanucleus.metadata input data for the DataNucleus persistence process.
org.datanucleus.metadata.xml
Provides classes for parsing XML metadata input data and converting into org.datanucleus.metadata input data for the DataNucleus persistence process.
org.datanucleus.plugin
Package providing the plugin mechanism utilised by DataNucleus.
org.datanucleus.properties
Package providing handling for persistence properties, and in particular the validation of valid values.
org.datanucleus.state
Provides classes relating to the life cycle state management of a persistable object.
org.datanucleus.store
Package handling the storage of classes to the datastore, and the management of the datastore.
org.datanucleus.store.autostart
Package providing the structure and some implementation for the auto-start mechanism.
org.datanucleus.store.connection
Package defining the connection to the datastore.
org.datanucleus.store.federation
Package providing management for federation of datastores.
org.datanucleus.store.fieldmanager
Package providing managers for fields which give a mechanism for navigating through fields of a class and performing operations based on the type of the field.
org.datanucleus.store.query
Package providing query language support for datastores.
org.datanucleus.store.query.cache
Package providing definition of caching for queries.
org.datanucleus.store.query.compiler
Package handling the (generic) compilation of queries.
org.datanucleus.store.query.expression
Package providing expressions from which a (generically) compiled query is made up.
org.datanucleus.store.query.inmemory
Package providing the evaluation of queries using an in-memory process with evaluators for JDOQL and JPQL.
org.datanucleus.store.query.inmemory.method
Package providing the evaluation of Java methods/functions for use by JDOQL/JPQL in-memory query evaluators.
org.datanucleus.store.schema
Package defining the data structure mechanism for the schema of the datastore.
org.datanucleus.store.schema.naming
This package is a work-in-progress to provide datastore-agnostic naming strategies for JDO, JPA and indeed any other API.
org.datanucleus.store.schema.table
Provides a series of convenience classes for modelling tables and columns that a class and its members map onto.
org.datanucleus.store.types
Package providing basic java type handling for DataNucleus.
org.datanucleus.store.types.containers
Package providing classes for supporting use of containers (collection, map, array) in DataNucleus.
org.datanucleus.store.types.converters
Package providing type conversion for member types, using the interface TypeConverter allowing conversion between some member Java type, and a Java type suitable for persistence in the datastore.
org.datanucleus.store.types.scostore
Package providing backing store definitions for (SCO) types that need a backing store.
org.datanucleus.store.types.wrappers
Provides implementations of the "simple" wrappers for the mutable Second Class Objects (SCO's) supported by DataNucleus, so that we can intercept calls that will mutate the object.
org.datanucleus.store.types.wrappers.backed
Provides implementations of the "backed" wrappers for the mutable Second Class Objects (SCO's) that are supported.
org.datanucleus.store.valuegenerator
Value Generation.
org.datanucleus.transaction
Package providing support specific to transactions for DataNucleus.
org.datanucleus.transaction.jta
Package providing handlers for JTA transactions
org.datanucleus.util
Provides utility classes used in the implementation that don't fit in a particular functional part of the system.