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<title>Error messages</title>
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<p><a id="CIHFEDEI" name="CIHFEDEI"></a></p>
<div class="sect2"><!-- infolevel="all" infotype="General" -->
<h1>Error messages<a id="sthref335" name="sthref335"></a></h1>
<p>This section contains information on error messages (including how to resolve the issue) you may encounter while working with Dali.</p>
<a id="sthref336" name="sthref336"></a>
<p class="subhead2">An exception handler class should be specified.</p>
<p>When using a custom exception handler, you must select (or create) a Java class to handle exceptions. See <a href="reference055.htm#CIAJAFEG">"Customization"</a>.</p>
<a id="sthref337" name="sthref337"></a>
<p class="subhead2">Attribute "<span class="italic">&lt;ATTRIBUTE__NAME&gt;</span>" has invalid mapping type in this context</p>
<p>The mapped attribute is invalid. Either change the mapping type or change the entity type.</p>
<p>See <a href="task_mapping.htm#BABDGBIJ">"Mapping an entity"</a> for more information.</p>
<a id="sthref338" name="sthref338"></a>
<p class="subhead2">Attribute "<span class="italic">&lt;ATTRIBUTE_NAME&gt;</span>" cannot be resolved.</p>
<p>Dali cannot map the attribute to a database table and column. Verify that you database connection information is correct.</p>
<p>See <a href="task_create_new_project.htm#CIHHEJCJ">"Creating a new JPA project"</a> for more information.</p>
<a id="sthref339" name="sthref339"></a>
<p class="subhead2">Class "<span class="italic">&lt;CLASS_NAME&gt;</span>" is not annotated as a persistent class.</p>
<p>The class has not been identified as a persistent class. Configure the class as an Entity, Mapped Superclass, or Embeddable persistent entity.</p>
<p>See <a href="task_add_persistence.htm#BABHICAI">"Adding persistence to a class"</a>.</p>
<a id="sthref340" name="sthref340"></a>
<p class="subhead2">Column "<span class="italic">&lt;COLUMN_NAME&gt;</span>" cannot be resolved.</p>
<p>You mapped an entity's field to an incorrect or invalid column in the database table. By default, Dali will attempt to map each field in the entity with an identically named row in the database table. If the field's name differs from the row's name, you must explicitly create the mapping.</p>
<p>Map the field to a valid row in the database table as shown in <a href="task_mapping.htm#BABDGBIJ">"Mapping an entity"</a>.</p>
<a id="sthref341" name="sthref341"></a>
<p class="subhead2">Converter is unnamed. All converters require a name.</p>
<p>When creating a converter, you must specify its name. See <a href="reference031.htm#CACJGDAJ">"Converters"</a>.</p>
<a id="sthref342" name="sthref342"></a>
<p class="subhead2">Converter name must not be a reserved converter name.</p>
<p>When creating a converter, you must cannot use the following reserved names:</p>
<ul>
<li>
<p><code>serialized</code></p>
</li>
<li>
<p><code>class-instance</code></p>
</li>
<li>
<p><code>none</code></p>
</li>
</ul>
<a id="sthref343" name="sthref343"></a>
<p class="subhead2">Duplicate class "<span class="italic">&lt;CLASS_NAME&gt;</span>".</p>
<p>You created to persistence classes with the same name. Each Java class must have a unique name. See <a href="task_add_persistence.htm#BABHICAI">"Adding persistence to a class"</a> for more information.</p>
<a id="sthref344" name="sthref344"></a>
<p class="subhead2">Entity does not have an Id or Embedded Id.</p>
<p>You created a persistent entity without identifying its primary key. A persistent entity must have a primary key field designated with an <code>@Id</code> or <code>@EmbeddedId</code> annotation.</p>
<p>Add an ID mapping to the entity as shown in <a href="tasks015.htm#BABGCBHG">"ID mapping"</a> or <a href="tasks014.htm#CIHDIAEE">"Embedded ID mapping"</a>.</p>
<a id="sthref345" name="sthref345"></a>
<p class="subhead2">Multiple generators named "&lt;GENERATOR_NAME&gt;" defined in this persistence unit.</p>
<p>When creating generators, the converter <span class="bold">Name</span> must be unique within the persistence unit. See <a href="reference029.htm#CACCJJDC">"Primary Key Generation"</a>.</p>
<a id="sthref346" name="sthref346"></a>
<p class="subhead2">Multiple persistence.xml files in project.</p>
<p>You created a JPA project with more than one <code>persistence.xml</code> file. Each JPA project must contain a <span class="italic">single</span> <code>persistence.xml</code> file.</p>
<p>See <a href="task_manage_persistence.htm#CIHDAJID">"Managing the persistence.xml file"</a> for more information.</p>
<a id="sthref347" name="sthref347"></a>
<p class="subhead2">Multiple converters named "<span class="italic">&lt;CONVERTER_NAME&gt;</span>" defined in this persistence unit</p>
<p>When creating converters, the converter <span class="bold">Name</span> must be unique within the persistence unit. See <a href="ref_add_converter.htm#CIAGCGIJ">"Add Converter dialog"</a>.</p>
<a id="sthref348" name="sthref348"></a>
<p class="subhead2">No persistence unit defined.</p>
<p>There is no persistence unit defined in the <code>persistence.xml</code> file. Use the &lt;persistence-unit name="<span class="italic">&lt;PERSISTENCE_UNIT_NAME&gt;</span>" tag to define the persistent unit.</p>
<p>See <a href="task_manage_orm.htm#CIHDGDCD">"Managing the orm.xml file"</a> for more information.</p>
<a id="sthref349" name="sthref349"></a>
<p class="subhead2">No persistence.xml file in project.</p>
<p>You created a JPA project without a <code>persistence.xml</code> file. Each JPA project must contain a <span class="italic">single</span> <code>persistence.xml</code> file.</p>
<p>See <a href="task_manage_persistence.htm#CIHDAJID">"Managing the persistence.xml file"</a> for more information.</p>
<a id="sthref350" name="sthref350"></a>
<p class="subhead2">Property "&lt;PROPERTY_NAME&gt;" will be ignored as shared-cache-mode is set to NONE.</p>
<p>Because the <span class="bold">Shared cache mode</span> option is set to <span class="bold">NONE</span>, Dali will ignore the property. See <a href="reference056.htm#CIABEDCH">"Caching"</a>.</p>
<a id="sthref351" name="sthref351"></a>
<p class="subhead2">Referenced column "<span class="italic">&lt;COLUMN_NAME&gt;</span>" in join column "<span class="italic">&lt;COLUMN_NAME&gt;</span>" cannot be resolved.</p>
<p>The column that you selected to join a relationship mapping does not exist on the database table. Either select a different column on the <a href="reference047.htm#CACIJEGI">Joining Strategy</a> or create the necessary column on the database table.</p>
<p>See <a href="ref_persistence_map_view.htm#BABIFBAF">"JPA Details view (for attributes)"</a> for more information.</p>
<a id="sthref352" name="sthref352"></a>
<p class="subhead2">Schema "&lt;<span class="italic">SCHEMA_NAME</span>&gt;" cannot be resolved for table/join table "&lt;<span class="italic">TABLE_NAME</span>&gt;".</p>
<p>Define the default database schema information in the persistence unit.</p>
<p>See <a href="task_manage_orm.htm#CIHDGDCD">"Managing the orm.xml file"</a> for more information.</p>
<a id="sthref353" name="sthref353"></a>
<p class="subhead2">Table "<span class="italic">&lt;TABLE_NAME&gt;</span>" cannot be resolved.</p>
<p>You associated a persistent entity to an incorrect or invalid database table. By default, Dali will attempt to associate each persistent entity with an identically named database table. If the entity's name differs from the table's name, you must explicitly create the association.</p>
<p>Associate the entity with a valid database table as shown in <a href="task_add_persistence.htm#BABHICAI">"Adding persistence to a class"</a>.</p>
<a id="sthref354" name="sthref354"></a>
<p class="subhead2">The @Cache annotation on entity <span class="italic">&lt;ENTITY_NAME&gt;</span> has both expiry() and expiryTimeOfDay() specified.</p>
<p>You attempted to include both <code>expiry</code> and <code>expiryTimeOfDay</code> in the <code>@Cache</code> annotation. You may use only one. See<a href="reference024.htm#CACJBBCA">"Caching"</a>.</p>
<a id="sthref355" name="sthref355"></a>
<p class="subhead2">The converter class <span class="italic">"&lt;CLASS_NAME&gt;"</span> does not exist on the project classpath.</p>
<p>You defined a convert class but did not include the class within the project. See<a href="reference031.htm#CACJGDAJ">"Converters"</a>.</p>
<a id="sthref356" name="sthref356"></a>
<p class="subhead2">The converter class "<span class="italic">&lt;CLASS_NAME&gt;</span>" does not implement the org.eclipse.persistence.mappings.converters.Converter interface</p>
<p>When creating a converter, its class must implement the <code>org.eclipse.persistence.mappings.converters.Converter</code> interface. See<a href="reference031.htm#CACJGDAJ">"Converters"</a>.</p>
<a id="sthref357" name="sthref357"></a>
<p class="subhead2">The converter class must be defined.</p>
<p>You attempted to use a converter without defining the class. See<a href="reference031.htm#CACJGDAJ">"Converters"</a>.</p>
<a id="sthref358" name="sthref358"></a>
<p class="subhead2">The entity customizer class "&lt;CLASS_NAME&gt;" does not implement the org.eclipse.persistence.config.DescriptorCustomizer interface.</p>
<p>When using a customer class for an entity, the class must implement the <code>org.eclipse.persistence.config.DescriptorCustomizer</code> interface. See <a href="reference032.htm#CACJEEDE">"Advanced"</a></p>
<a id="sthref359" name="sthref359"></a>
<p class="subhead2">The exception handler class "<span class="italic">&lt;CLASS_NAME&gt;</span>" does not implement the org.eclipse.persistence.exceptions.ExceptionHandler interface.</p>
<p>When using a custom exception handler, you must select (or create) a Java class that implements the <code>org.eclipse.persistence.exceptions.ExceptionHandler</code> class. See <a href="reference055.htm#CIAJAFEG">"Customization"</a>.</p>
<a id="sthref360" name="sthref360"></a>
<p class="subhead2">The persistent field or property for a Version mapping must be of type int, Integer, short, Short, long, Long, or Timestamp.</p>
<p>Version mappings may be used only with the following attribute types:</p>
<ul>
<li>
<p><code>int</code></p>
</li>
<li>
<p><code>Integer</code></p>
</li>
<li>
<p><code>short, Short</code></p>
</li>
<li>
<p><code>long, Long</code></p>
</li>
<li>
<p><code>Timestamp</code></p>
</li>
</ul>
<p>See <a href="tasks021.htm#BABHIBII">"Version mapping"</a>.</p>
<a id="sthref361" name="sthref361"></a>
<p class="subhead2">The struct converter class "<span class="italic">&lt;CLASS_NAME&gt;</span>" does not implement the org.eclipse.persistence.platform.database.converters.StructConverter interface.</p>
<p>When creating a Struct converter (to enable custom processing of <code>java.sql.Struct</code> types), its class must implement the <code>org.eclipse.persistence.mappings.converters.StructConverter</code> interface. See<a href="reference031.htm#CACJGDAJ">"Converters"</a>.</p>
<a id="sthref362" name="sthref362"></a>
<p class="subhead2">Unresolved generator "<span class="italic">&lt;GENERATOR_NAME&gt;</span>" is defined in persistence unit.</p>
<p>You created a persistence entity that uses sequencing or a table generator, but did not define the generator in the persistence unit. Either define the generator by using an annotation or including it in the XML mapping file.</p>
<a id="sthref363" name="sthref363"></a>
<p class="subhead2">Related concepts</p>
<ul>
<li>
<p><a href="../org.eclipse.platform.doc.user/concepts/cprbview.htm">Problems view</a></p>
</li>
</ul>
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