About byte

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JDO Doc
3

PersistenceCapable.READ_WRITE_OK

Static Field javax.jdo.spi.PersistenceCapable byte READ_WRITE_OK If jdoFlags is set to READ_WRITE_OK, then the fields in the default fetch group can be accessed for read or write without notifying the StateManager. Since: JDO 1.0
JDO Doc
3

PersistenceCapable.SERIALIZABLE

Static Field javax.jdo.spi.PersistenceCapable byte SERIALIZABLE If jdoFieldFlags for a field includes SERIALIZABLE, then the field is not declared as TRANSIENT. Since: JDO 1.0
JDO Doc
3

providedByteField(pc, field, currentValue)

Method javax.jdo.spi.StateManager void providedByteField(   PersistenceCapable pc,   int field,   byte currentValue ) The value of the field requested to be provided to the StateManager. Parameters: pc - the calling PersistenceCapable instance field - the field number currentValue - the current value of the field Since: JDO 1.0
JDO Doc
3

registerClass(pcClass, fieldNames, fieldTypes, fieldFlags, persistenceCapableSuperclass, pc)

Static Method javax.jdo.spi.JDOImplHelper void registerClass(   Class pcClass,   String[] fieldNames,   Class[] fieldTypes,   byte[] fieldFlags,   Class persistenceCapableSuperclass,   PersistenceCapable pc ) Register metadata by class. The registration will be done in the class named JDOImplHelper
JDO Doc
3

RegisterClassEvent(helper, registeredClass, fieldNames, fieldTypes, fieldFlags, persistenceCapableSuperclass)

Constructor javax.jdo.spi.RegisterClassEvent RegisterClassEvent(   JDOImplHelper helper,   Class registeredClass,   String[] fieldNames,   Class[] fieldTypes,   byte[] fieldFlags,   Class persistenceCapableSuperclass ) Constructs a new RegisterClassEvent. Parameters: helper - the JDOImplHelper
JDO Doc
3

replacingByteField(pc, field)

Method javax.jdo.spi.StateManager byte replacingByteField(   PersistenceCapable pc,   int field ) The replacement value of the field in the calling instance. Parameters: pc - the calling PersistenceCapable instance field - the field number Returns: the new value for the field Since: JDO 1.0
JDO Doc
3

replacingFlags(pc)

Method javax.jdo.spi.StateManager byte replacingFlags(   PersistenceCapable pc ) The owning StateManager uses this method to supply the value of the flags to the PersistenceCapable instance. Parameters: pc - the calling PersistenceCapable instance Returns: the value of jdoFlags to be stored in the PersistenceCapable instance Since: JDO 1.0
JDO Doc
3

setResultClass(cls)

may be specified to be one of the java.lang classes Character, Boolean, Byte, Short, Integer, Long, Float
JDO Doc
3

javax.jdo.Query

may be specified to be one of the java.lang classes Character, Boolean, Byte, Short, Integer, Long, Float
Issue
3

Use temporary files to enable very large transactions

flush() and detach()). But an array of bytes, any ObjectDB memory, still allocates a lot of memory ... instances in memory that wrap byte[] content with additional information. Even if the byte[] content ... .dat will be bigger after flush. Also we see in a heap dump many byte arrays which are referenced by