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objectdb-2.6.9_02 (with "objectdb.temp.no-enhancement-crc-check") vs. generic classes with interfaces: detailed investigation

for "deep" value wrappers with signatures like: @Entity abstract public class Value<T> extends ... this has consequences for at least one issue (see below). The above "deep" value wrapper classes ... of the EnumValue compared with the other generic value wrapper examples, as it exhibits a problem
5

java.lang.Throwable

and detail message of cause). This constructor is useful for throwables that are little more than wrappers
5

Throwable(cause)

that are little more than wrappers for other throwables (for example, java.security.PrivilegedActionException
5

javax.persistence.Id

javax.persistence Annotation Id Target: Fields (including property get methods) Specifies the primary key of an entity. The field or property to which the Id annotation is applied should be one of the following types: any Java primitive type; any primitive wrapper type; String; java.util.Date; java
1

javax.jdo.Query

and instances of wrapper classes are valid. Equality and ordering comparisons of Date fields and Date ... class. Valid field types are primitive types except boolean; wrapper types except Boolean ... (treating wrapper classes as equivalent to their unwrapped primitive types) or by matching
0

setResultClass(cls)

(treating wrapper classes as equivalent to their unwrapped primitive types) or by matching ... of the result expression and is of the type (treating wrapper types equivalent to primitive types
0

setOrdering(ordering)

class. Valid field types are primitive types except boolean; wrapper types except Boolean; BigDecimal
0

javax.jdo.spi.PersistenceCapable

specified: Number or Character: the parameter must be the single field type or the wrapper class
0

jdoNewObjectIdInstance(o)

: Number or Character: the parameter must be the single field type or the wrapper class of the primitive
0

setFilter(filter)

, except for these differences: Equality and ordering comparisons between primitives and instances of wrapper classes

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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