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Type xxx is not found (error 301)

The error: Type User is not found (error 301) occurs when I query the db for a type before any instances of that type have been persisted, e.g.: return em.createQuery ("SELECT a FROM User ... execution by using:     em.find(User.class, User.class); but this is not a portable JPA code

Query results are not up to date for entities, not primitives

="64mb" />   <network inactivity-timeout="0" />   <url-history size="50" user="true" password ... ;user=XXXXX;password=XXXXX" />   --> </server> <users>   <user username="XXXXX" password="XXXXX">    <dir path="/" permissions="access,modify,create,delete" />   </user>   <user username

significant performance decrease

" user="true" password="true" /> <log path="$objectdb/log/" max="8mb" stdout="false" stderr="false ... ;user=admin;password=admin" /> --> </server> <users> <user username="admin" password="admin"> <dir path="/" permissions="access,modify,create,delete" /> </user> <user username

locks on pure query activities

" /> <url-history size="50" user="true" password="true" /> <log path="$objectdb/log/" max="8mb" stdout ... -server enabled="true" /> <!-- <replication url="objectdb://localhost/test.odb;user=admin;password=admin" /> --> </server> <users> <user username="admin" password="admin"> <dir path


Annotation Element javax.persistence.Table String schema (Optional) The schema of the table. Defaults to the default schema for user. Default value: "" Since: JPA 1.0


Annotation Element javax.persistence.SecondaryTable String schema (Optional) The schema of the table. Defaults to the default schema for user. Default value: "" Since: JPA 1.0


the scope of user-defined classes. All of its declared method names are prefixed with 'jdo

setStringField(pc, field, currentValue, newValue)

Method javax.jdo.spi.StateManager void setStringField( PersistenceCapable pc, int field, String currentValue, String newValue ) Mark the field as modified by the user. Parameters: pc - the calling PersistenceCapable instance field - the field number currentValue - the current value of the field

putUserObject(key, val)

Method javax.jdo.PersistenceManager Object putUserObject( Object key, Object val ) Put the specified key-value pair into the map of user objects. Parameters: key - val - Since: JDO 2.0


for which no user error handling is possible. The error should be reported to the JDO vendor for corrective

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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