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- since someone can change the object just after the refresh . In that case - use pessimistic locks. support ... - since someone can change the object just after the refresh. In that case - use pessimistic locks ... , so that doesn't help me. Pessimistic locks might not help either, given #3 above, ie: it seems like

, that setting is for optimistic locking. My question was about pessimistic locking (specifically, pessimistic write locking). Your documentation seems unclear about that.   dmoshal David Moshal ... pessimistic locking only? I've tried various xml configurations, and also various transaction

.getSelectedValue(),       LockModeType. PESSIMISTIC _ WRITE ); . . } //doEdit ... , LockModeType. PESSIMISTIC _ WRITE );         System.out.println ... ;      em.lock(p, LockModeType. PESSIMISTIC _ WRITE );     

the next build an option to disable this zero writing in order to see if it helps. If we disable ... .RandomAccessFile:writeBytes, which takes up to 10 seconds. I've also noticed a large IO write spike at the same ... that can cause large file writes ? I would estimate the size of actual data in the db file

. ObjectValue ID:=100, TYPE:=Person, REVISION:=0, isPersisted:=true, LockMode:= PESSIMISTIC _ WRITE ... . ObjectValue ID:=100, TYPE:=Person, REVISION:=2, isPersisted:=true, LockMode:= PESSIMISTIC _ WRITE

; support Support A possible solution (which is currently not implemented) is to use pessimistic locking ... want to use Pessimistic Lock as a way of enforcing a cluster wide singleton of services, a pessimistic ... adds automatic release of pessimistic locks on client-server disconnection. The locks

= A + B + 20 | WRITE (B) version=2 value=20 A = A + B + 10 | WRITE (A) version=2 value=10 ...   Thanks. eurojet P. F. Martinez Please explain the test output: Sequential=true Lock= WRITE ... value=0 Thread[Thread-2,5,main] WRITE A1 version=2 value=10 Thread[Thread-3,5,main] READ  A1

. Also have the Explorer open Questions: a) what is it about? b) is there a setting for pessimistic mode? In my app ... guess I should read doco more. I ran into the same error from a pessimistically locked entity (global ... on pessimistically tracked entity.   Modified conf file, and got the test case working perfectly.  

: [ObjectDB 2.2.8_01] javax.persistence.PersistenceException Failed to write the value of field property edu ... : Failed to write the value of field property edu.um.fcsit.jpa.entity.Guest.phoneList using enhanced ... Failed to write the value of field field org.dyndns.fzoli.mill.server.model.entity.Player

:25:43 - MASTER instance stopped responding to write requests. All requests sent to the database ... (Unknown Source) The reading continued to work and there was nothing in the server DB logs. All write ... are executed and WRITE requests are rejected. Maybe even the high GC on the slave is the result

? Yes, if it has not been locked with pessimistic WRITE . , and will it see the old attribute? Yes

and add them to my persistence unit but being able to read and not write is a condition that can't last ... have two(or more) entity managers in my DAO layer and write all changes to both instances(may have IDs synchronization issues), if one of the instances is not available, I'll keep writing to the instance

- if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking

the persistence context has not been joined to the transaction PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails

has not been joined to the transaction PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails

Is it possible to change a LockTimeout for  pessimistic  lock? glaz Alexandr Kurucin Currently ObjectDB throws a LockTimeoutException immediately when a pessimistic lock cannot be granted. Future versions will support timeout setting. You may fill a feature request to increase the priority of this feature.   support Support

to write to the parent directory. support Support can you please elaborate what exactly "Try running ObjectDB in a process with no permission to write to the parent directory". I did not undertand ... how to do this. And if write permission permission is blocked for the parent folder, won't ObjectDB locking method

to write the value of field field com.objectdb.test.bug.forum.T501$Store.offers using reflection ... ) Caused by: com.objectdb.error.UserException: Failed to write the value of field field com.objectdb.test ... .type.user.UserMember. write (UserMember.java:544) at com.objectdb.type.user.UserMemberList. write

do only few writes (mostly reads), but those writes are important for us - objects rating, profile modifications ... and all writes fails. I was thinking about special version of one master / one slave only cluster ... yet, and therefore, if the slave accepts write operations they may be based on a state, which is not the most up to date

doesn't support JDBC connections and the only way to load data is by using JPA or JDO, i.e. by writing ... with JAXB, so writing lists of entities to xml file should be easy - a generic mechanism to read / unmarshall those files into lists of entities for writing to database may be more ObjectDB / JPA centric

is reading/ writing the files. The tests are showing that the HW RAID5/6 of HDDs deliver comparable ... files, so in fact it means sequential reads/ writes . If it is tested on small files the speed is getting ... ObjectDB read/ write the DB files by large chunks and then it parses it within the RAM (so it would mean

JPA Enum Constant in javax.persistence.PessimisticLockScope NORMAL This value defines the default behavior for pessimistic locking. The persistence provider must lock the database row(s) that correspond to the non-collection-valued persistent state of that instance. If a joined inheritance

when EntityManager.lock is used with pessimistic locking is used and the entity no longer exists in the database

JPA Exception LockTimeoutException java.lang.Object ∟  java.lang.Throwable ∟  java.lang.Exception ∟  java.lang.RuntimeException ∟  javax.persistence.PersistenceException ∟  javax.persistence.LockTimeoutException Thrown by the persistence provider when an pessimistic

when an pessimistic locking conflict occurs. This exception may be thrown as part of an API call, a flush or at commit

JPA Method in javax.persistence.EntityTransaction void commit () Commit the current resource transaction, writing any unflushed changes to the database. Throws: IllegalStateException - if isActive() is false RollbackException - if the commit fails Since: JPA 1.0

Since: JPA 1.0 void commit () Commit the current resource transaction, writing any unflushed

and LockMode set to PESSIMISTIC _ WRITE . This results in the exceptions below. Could you advise on the errors

The new ObjectDB Manual describes how to use ObjectDB 2 with JPA. An additional manual that focuses on using ObjectDB 2 with JDO can help JDO users. But since writing a new manual ... however, married to JDO, although I think it's good. Its lack of true (before commit) pessimistic locking

Added support of JPA UPDATE and DELETE queries ( issue #12 ). Added support of pessimistic lock timeout ( javax.persistence.lock.timeout ). Added implementation of the getParameters method. Added exception on pessimistic locking retrieval with no active transaction. Improved support of entity

. The message size going into the queue is not large - around 4k at most. Each read/ write operation ... for each database) and 2 reader threads (1 for each database). Each thread should read or write 10 msgs ... might have actually replicated it now... The attached test (testObjectDbPipe) has 10 threads which write msgs

of your production OS or disk requires special consideration (e.g. if synchronized writing by ObjectDB to the disk returns before the physical writing is completed and the data is still buffered by the OS / disk ... after writing and flushing the transaction updates to the recovery file (the database file

of the key Since: JDO 1.0 void writeExternal (ObjectOutput out) Write this object. Write

JDO Method in javax.jdo.identity.IntIdentity void writeExternal (   ObjectOutput out ) Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0

Since: JDO 1.0 void writeExternal (ObjectOutput out) Write this object. Write the superclass

JDO Method in javax.jdo.identity.ObjectIdentity void writeExternal (   ObjectOutput out ) Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0

JDO Method in javax.jdo.identity.LongIdentity void writeExternal (   ObjectOutput out ) Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0

void writeExternal (ObjectOutput out) Write this object. Write the superclass first. Parameters

: the key. Since: JDO 1.0 void writeExternal (ObjectOutput out) Write this object. Write

JDO Method in javax.jdo.identity.CharIdentity void writeExternal (   ObjectOutput out ) Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0

JDO Method in javax.jdo.identity.ByteIdentity void writeExternal (   ObjectOutput out ) Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0

writeExternal (ObjectOutput out) Write this object. Write the superclass first. Parameters

JDO Method in javax.jdo.identity.ShortIdentity void writeExternal (   ObjectOutput out ) Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0

form of the key Since: JDO 1.0 void writeExternal (ObjectOutput out) Write this object. Write

JDO Method in javax.jdo.identity.StringIdentity void writeExternal (   ObjectOutput out ) Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0

: the String form of the key Since: JDO 1.0 void writeExternal (ObjectOutput out) Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0 Method inherited from class

, and the StateManager approves the change, then the jdoFlags field will be reset to READ_ WRITE _OK

;out) Write to the output stream. Parameters: out - the stream Since: JDO 1.0 Method inherited from class

, and the StateManager approves the change, then the jdoFlags field will be reset to READ_ WRITE _OK. If the parameter

JDO Method in javax.jdo.identity.SingleFieldIdentity void writeExternal (   ObjectOutput out ) Write to the output stream. Parameters: out - the stream Since: JDO 1.0