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10

Failed to read DB file while online backup is running

stacktrace (no inner exception is shown) and it is not related anymore to running of online backups. Maybe ... .join();   } catch (InterruptedException e) {    e.printStackTrace();   }   em.close
2

fetch(attributeName, jt)

Method javax.persistence.criteria.FetchParent Fetch<X,Y> fetch( String attributeName, JoinType jt ) Create a fetch join to the specified attribute using the given join type. Parameters: attributeName - name of the attribute for the target of the join jt - join type Returns: the resulting fetch join
2

fetch(attribute, jt)

Method javax.persistence.criteria.FetchParent Fetch<X,Y> fetch( SingularAttribute<?,Y> attribute, JoinType jt ) Create a fetch join to the specified single-valued attribute using the given join type. Parameters: attribute - target of the join jt - join type Returns: the resulting fetch join Since: JPA 2.0
2

joinSet(attributeName, jt)

Method javax.persistence.criteria.From SetJoin<X,Y> joinSet( String attributeName, JoinType jt ) Create a join to the specified Set-valued attribute using the given join type. Parameters: attributeName - name of the attribute for the target of the join jt - join type Returns: the resulting join
2

joinList(attributeName, jt)

Method javax.persistence.criteria.From ListJoin<X,Y> joinList( String attributeName, JoinType jt ) Create a join to the specified List-valued attribute using the given join type. Parameters: attributeName - name of the attribute for the target of the join jt - join type Returns: the resulting join
2

joinMap(attributeName, jt)

Method javax.persistence.criteria.From MapJoin<X,K,V> joinMap( String attributeName, JoinType jt ) Create a join to the specified Map-valued attribute using the given join type. Parameters: attributeName - name of the attribute for the target of the join jt - join type Returns: the resulting join
2

joinCollection(attributeName, jt)

, JoinType jt ) Create a join to the specified Collection-valued attribute using the given join type. Parameters: attributeName - name of the attribute for the target of the join jt - join type Returns: the resulting join Throws: IllegalArgumentException - if attribute of the given name does not exist Since: JPA 2.0
2

combined index not used

: (v$1.linkedObjects join v$2). Step 5: Process ObjectProperty (v$3) instances ... .properties join v$3). [Step 5b] Evaluate fields in ObjectProperty (v$3) instances. [Step 5c ... is preferred and can improve performance). Complex heavy queries with several JOIN operations require
0

javax.jdo.annotations.Element

key constraint exists on the column or columns associated with this join. Generate or assume a foreign key constraint exists on the column or columns associated with this join. Specify "true" or ... serialized Whether the element is to be stored serialized (into a join table) Whether the element
0

javax.jdo.annotations.Value

a foreign key constraint exists on the column or columns associated with this join. Generate or assume a foreign key constraint exists on the column or columns associated with this join. Specify "true" or ... String serialized Whether the value is to be stored serialized (into a single column of a join table

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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