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| <h3>JDO Exceptions<a id="JDO_Exceptions"></a></h3> |
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| --> |
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| <div class="sect1"> |
| <h2 id="index">JDO Exceptions<a id="JDO_Exceptions"></a></h2> |
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| <p>All exceptions raised by a JDO implementation are runtime exceptions |
| which means that you can choose to catch the exceptions or not. The |
| reason for JDO using <em>unchecked</em> exceptions is that JDO tries to provide |
| transparent persistence, and so needs to present the same interface and |
| exceptions whatever the state an object has.</p> |
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| <h3 id="_jdoexception_a_id_jdoexception_a">JDOException<a id="JDOException"></a></h3> |
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| <p>This is the base class for all JDO exceptions. It is a subclass of |
| RuntimeException, and need not be declared or caught.</p> |
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| <p><br></p> |
| </div> |
| </div> |
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| <h3 id="_can_retry_exceptions_a_id_can_retry_exceptions_a">Can Retry Exceptions<a id="Can_Retry_Exceptions"></a></h3> |
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| </div> |
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| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Exception</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOCanRetryException</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This is the base class for errors that can be |
| retried.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOUserException</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This is the base class for user errors that can be |
| retried.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDODataStoreException</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This is the base class for datastore errors that |
| can be retried. Any root SQLException that caused this will typically be |
| nested within this exception.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOObjectNotFoundException</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This exception is to notify the application |
| that an object does not exist in the datastore. When this exception is |
| thrown during a transaction, there has been no change in the status of |
| the transaction in progress. If this exception is a nested exception |
| thrown during commit, then the transaction is rolled back.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOUnsupportedOptionException</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This exception is thrown by an |
| implementation to indicate that it does not implement a JDO optional |
| feature.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p><br></p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_fatal_exceptions_a_id_fatal_exceptions_a">Fatal Exceptions<a id="Fatal_Exceptions"></a></h3> |
| <div class="paragraph"> |
| <p><span class="image"><img src="images/jdo_exception_fatal.jpg" alt="JDO Fatal Exceptions"></span></p> |
| </div> |
| <table class="tableblock frame-all grid-cols spread"> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Exception</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOFatalException</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This is the base class for errors that cannot be |
| retried. This exception generally means that the transaction associated |
| with the PersistenceManager has been rolled back, and the transaction |
| should be abandoned.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOFatalUserException</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This is the base class for user errors that |
| cannot be retried.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOFatalInternalException</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This is the base class for JDO |
| implementation failures.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOFatalDataStoreException</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This is the base class for fatal datastore |
| errors. When this exception is thrown, the transaction has been rolled |
| back. Any root SQLException that caused this will typically be nested |
| within this exception.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOOptimisticVerificationException</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This exception is the result of a |
| user commit operation in an optimistic transaction where the |
| verification of new, modified, or deleted instances fails the |
| verification. The user will never see this exception except as a result |
| of commit.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDODetachedFieldAccessException</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This exception is the result of a user |
| accessing a field of a detached instance, where the field was not copied |
| to the detached instance.</p></td> |
| </tr> |
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