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JDO Doc
52

Constants.TX_REPEATABLE_READ

Static Field javax.jdo.Constants String TX_REPEATABLE_READ Transaction isolation level representing the requirement to read the same data in the same transaction. Since: JDO 2.2 See Also: PersistenceManagerFactory.getTransactionIsolationLevel() Transaction.getIsolationLevel()
JPA Doc
52

LockModeType.PESSIMISTIC_READ

Enum Constant javax.persistence.LockModeType PESSIMISTIC_READ Pessimistic read lock. Since: JPA 2.0
JDO Doc
51

Constants.OPTION_NONTRANSACTIONAL_READ

Static Field javax.jdo.Constants String OPTION_NONTRANSACTIONAL_READ "javax.jdo.option.NontransactionalRead" Since: JDO 2.1 See Also: PersistenceManagerFactory.supportedOptions()
JDO Doc
51

Constants.PROPERTY_NONTRANSACTIONAL_READ

Static Field javax.jdo.Constants String PROPERTY_NONTRANSACTIONAL_READ "javax.jdo.option.NontransactionalRead" Since: JDO 2.1 See Also: PersistenceManagerFactory.getNontransactionalRead()
JPA Doc
51

LockModeType.READ

Enum Constant javax.persistence.LockModeType READ Synonymous with OPTIMISTIC. OPTIMISTIC is to be preferred for new applications. Since: JPA 1.0
Forum
24

Error in reading Enum in JPA - Failed to read using reflection

with valid values of Status. This is all done with JPA/EJBs. However, at the time of reading the Object (findById), the system throws an error  com.objectdb.o.UserException: Failed to read the value
Manual
21

Locking in JPA

supported pessimistic lock modes are: PESSIMISTIC_READ - which represents a shared lock. PESSIMISTIC_WRITE ... cannot be granted: A PESSIMISTIC_READ lock request fails if another user (which is represented by ... a PESSIMISTIC_READ lock on that database object. For example, consider the following code fragment: em1
Issue
19

Query fails with failed to read

2-3 times per day we have a query that fails with:   Failed to read from file 'F:\Hummingbird ... : Failed to read from file 'F:\Hummingbird\Objectdb\db\coresystemdb.odb' [2018.08.09 10:41:30](2)class ... store.file] LocalFile.read error: 0, 52076077056, 2048 [2018-08-17 19:14:41 #5 store.file
Forum
19

Master database switching to read-only mode, possibly caused by slave failure

, slave became unresponsive and the master switched to read-only mode. By the look of it the slave database failed first and possibly caused the master to switch to read-only mode. The sequence ... .java:133) at java.lang.Thread.run(Unknown Source) The reading continued to work
Forum
18

Failed to read DB file while online backup is running

Hi, it happened already few times (seemingly randomly), that some db operation (read and also write ... ._JdoUserException: Failed to read from file '/path_to_db/dbFile.odb' NestedThrowables: java.io ... to read from file '/path_to_db/dbFile.odb' NestedThrowables: java.lang.NullPointerException