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supported pessimistic lock modes are: PESSIMISTIC _ READ - which represents a shared lock. PESSIMISTIC ... 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

JPA Enum Constant in javax.persistence.LockModeType PESSIMISTIC _ READ Pessimistic read lock. Since: JPA 2.0

index) - and my test case is failing here. The issue is that once the pessimistic lock is in place ... on stale updates. Willks William Support of  pessimistic lock timeout setting ( javax.persistence ... .ProductCodeTracking:1 I have to stress, that the pessimistically locked entity has a transaction

().begin(); Account a2 = em2.find(Account.class, 0, LockModeType. PESSIMISTIC _ READ ... It appears that EntityTransaction.commit() does not release a pessimistic lock - test code ... .getTransaction().begin(); Account a1 = em1.find(Account.class, 0, LockModeType. PESSIMISTIC _WRITE); a1

JPA Enum Constant in javax.persistence.LockModeType PESSIMISTIC _FORCE_INCREMENT Pessimistic write lock, with version update. Since: JPA 2.0

JPA Enum Constant in javax.persistence.LockModeType PESSIMISTIC _WRITE Pessimistic write lock. Since: JPA 2.0

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

adds support for pessimistic locking . The setLockMode method sets a lock mode that has to be applied ... a pessimistic WRITE lock on all the result objects:   List results = query. setLockMode ( LockModeType . PESSIMISTIC _WRITE ) . getResultList (); Notice that when a query is executed

, 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 ... (Unknown Source) The reading continued to work and there was nothing in the server DB logs. All write

Hi, it happened already few times (seemingly randomly), that some db operation ( read ... ._JdoUserException: Failed to read from file '/path_to_db/dbFile.odb' NestedThrowables: java.io ... by: com.objectdb.o._JdoUserException: Failed to read from file '/path_to_db/dbFile.odb

try to read the Event type, I'm getting the following exception. As far as I can tell, I'm ... .PersistenceException Failed to read the value of field com.pvdc.model.entity.EEvent.town using ... .main(RemoteTestRunner.java:197) Caused by: com.objectdb.o.UserException: Failed to read the value

.objectdb.o.InternalException: Error reading UTF string at org.jboss.as.ejb3.tx.CMTTxInterceptor ... reading UTF string at granat.dp.ejb.PersonBean.find(PersonBean.java:287) [DP-ejb.jar:] at sun.reflect ... .1.1.Final] ... 88 more Caused by: com.objectdb.o.InternalException: Error reading UTF string at com

- we sometimes fail to read entities from the database. I've isolated this issue to a fairly simple test ... test that creates, reads and updates these entities in multithreaded application it sometimes fails to read them from the DB with "No matching results for a unique query" error

well. Today we restarted the app and it threw the following exception during startup while trying to read ... well. Although the stack trace indicates an error while reading the hash map, if some objects in the database

2.4.1_06] javax.persistence.PersistenceException Attempt to update types in read only mode (error ... .UserException: Attempt to update types in read only mode at com.objectdb.o.MSG.d(MSG.java:61) at com.objectdb

which is having object db 1.x installed. Is there any way to  read odb files from 1.x in object db 2.x without upgrading it ? Or user can see the content in read only mode without upgrading it ? Thanks

I have recently encountered an issue with reading objects: Exception: com.objectdb.o.UserException Message: Failed to read the value of field field Character.stats using reflection Stack Trace: com.objectdb.o.MSG.d(MSG.java:75) com.objectdb.o.UMR.P(UMR.java:934) com.objectdb.o.UMR.B(UMR.java:609

reading UTF string com.objectdb.o.InternalException: Error reading UTF string at com.objectdb.o.BYR

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

, but a strong background and understanding of the Java language is essential. Further Reading ... a short time. After reading this guide you may want to extend your knowledge of JPA by reading a book on JPA.  

I've attached a simple test which creates an object then kicks off several threads which each try to update the object. I'm using a pessimistic lock with timeout as follows: Map properties = new ... .class, 1, LockModeType. PESSIMISTIC _WRITE, properties); One thread manages to do its update

call, it must throw the PersistenceException . The lock modes LockModeType. PESSIMISTIC _ READ , LockModeType ... -term database locks. The semantics of requesting locks of type LockModeType. PESSIMISTIC _ READ ... . If transaction T1 calls for a lock of type LockModeType. PESSIMISTIC _ READ or LockModeType. PESSIMISTIC _WRITE

master-slave replication, the master node manages the main (master) database, which supports Read ... , which are limited to READ operations. Any update to the master database is automatically 

This chapter introduced the basic principles of JPA using ObjectDB. You can go into details by reading the other chapters of this manual. If you prefer to get started with ObjectDB right away ... /JPA projects simply by modifying this sample program. Reading the Next Chapters

and the lock mode type is pessimistic and the entity has a version attribute, the persistence ... , the OptimisticLockException will be thrown. If the lock mode type is pessimistic and the entity ... PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException

2-3 times per day we have a query that fails with:   Failed to read from file 'F:\Hummingbird ... this: ... [2018.08.09 10:41:30](2)class com.agile.hummingbird.CT_Containerquery error: Failed to read ... for this on our application level):   [2018-08-17 19:14:41 #4 store.file] LocalFile. read error: 0, 52076077056, 2048

. It seems that there is a problem in reading the pricing field, whose type is serializable ( Money ... , which is needed during read . Please check this query (and accessing that instance in general) from your program

Hello, we have found several these exceptions in our log [ObjectDB 2.5.0_06] javax.persistence.PersistenceException Failed to read from file 'C:\SafeQORS\server\cache\MainORSCache.odb' (error 117 ... : Failed to read from file 'C:\SafeQORS\server\cache\MainORSCache.odb' at com.objectdb.o.MSG.d(MSG.java

Second thing after @FetchGroup I've found is read -only hint for EM. You can specify this hint to EM when executing query meaning that returned data will never be edited or persisted ... .setHint("odb. read -only", "true"); This could be useful in situation when you are sure, that you won't

Source) ... 4 more Caused by: com.objectdb.o._PersistenceException: Failed to read the value of field ... : com.objectdb.o.UserException: Failed to read the value of field field rbccm.felix.objectdb.messaging

automatically injects the version value into that field. Version fields should be treated as read only by

Please read carefully this software license agreement. By downloading, installing or using the software you agree to the terms and conditions of this agreement. If you do not agree to these terms and conditions - do not download, install or use the software. This agreement is between ObjectDB

of these documentation pages is to serve as a reference. In order to learn how to use JPA and ObjectDB please read the ObjectDB manual .

The best source for learning ObjectDB is the ObjectDB Manual , which contains all the necessary information for using ObjectDB. The only required background is a good understanding of the Java language. Reading the manual and getting started with ObjectDB could be easier for developers with prior

Please read the ObjectDB licence page.

: access - permission to open a database for read . modify - permission to modify the content

This chapter demonstrates basic ObjectDB and JPA concepts by introducing a simple example program. After reading this chapter you should be able to write basic programs that create, open and close ObjectDB databases and perform basic CRUD operations (Create/Store, Retrieve, Update and Delete

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

JDO Static Field in javax.jdo.Constants TX_ READ _COMMITTED Transaction isolation level representing the requirement to read committed data only. See Also: PersistenceManagerFactory.getTransactionIsolationLevel () Transaction.getIsolationLevel () Since: JDO 2.2

JDO Static Field in javax.jdo.Constants TX_ READ _UNCOMMITTED Transaction isolation level representing the ability to read uncommitted data. See Also: PersistenceManagerFactory.getTransactionIsolationLevel () Transaction.getIsolationLevel () Since: JDO 2.2

) must always be performed within an active transaction. On the other hand, reading from the database does not ... transaction, on every retrieval of an object from the database a READ lock on that object ... transaction, a WRITE lock is obtained on that object by the PersistenceManager . Multiple READ locks

: This is the end of the tutorial. Learn more about ObjectDB and JPA by reading the Manual .

; ObjectDB Explorer : This is the end of the tutorial. Learn more about ObjectDB and JPA by reading the  Manual .

: This is the end of the tutorial. Learn more about ObjectDB and JPA by reading the Manual .

by opening it in the ObjectDB Explorer : This is the end of the Eclipse JPA tutorial. Learn more about ObjectDB and JPA by reading the Manual .

the database file in ObjectDB Explorer : This is the end of the tutorial. Learn more about ObjectDB and JPA by reading the Manual .

server and open the database file in ObjectDB Explorer : This is the end of the tutorial. Learn more about ObjectDB and JPA by reading the Manual .

of the tutorial. Learn more about ObjectDB and JPA by reading the Manual .

transactional persistent objects. By default, these objects are read -only and a JDOUserException ... ) When a JDOHelper.isDirty(obj) is true a WRITE lock is used and when it is false a READ lock is used ... action is taken by ObjectDB to update the object lock (for example from READ to WRITE). Locks

and understanding of the Java language is essential. Further Reading and Resources This guide focuses mainly on practical issues in order to make the reader proficient in a short time. After reading this guide you may want to extend your knowledge of JDO by reading the JDO specification or a book on JDO