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Optimistic Lock Exception With No Concurrency

Have read read the documentation on optimistic locks , still not sure how to deal ... : Optimistic lock failed for object   dmoshal David Moshal perhaps I should explain the problem, which is that the optimistic lock exception fails repeatedly once the object is modified from

with temporarily files and locking in Linux, if parallel processes access different files in the same directory ... the access on temporarily files with file locking ? btc_es BTC EmbeddedSystems Is it related ... , it is related to the original post. In Linux we try to get a lock on a lock file additionally by opening

temporary files of other processes that are not locked (active temporary files are always locked ... so you cannot identify the process of each temporary directory. In that directory a lock file, lock .lck ... temporary directory of a process, an attempt to delete lock .lck is made. It should fail if the process

Since: JPA 2.0 LockModeType getLockMode () Get the current lock mode for the query. Returns null if a lock mode has not been set on the query object. Return: lock mode Throws: IllegalStateException ... - if a lock mode other than NONE has been set and there is no transaction or the persistence context

Emmanuel Keskes Another thing I just noticed: I used to do a clear after running each query - The lock ... ) and the lock contention view. You can see that Thread R1 is running smoothly with no lock Step3 : run test_TWO_queries() - you can see there are many interruptions - and they seem to get to lock

to see considerable degrade in performance caused internal objectdb locking : "pdncrttorfo42-WSAgent-1 ... ) - waiting to lock (a com.objectdb.o.PGC) owned by "ODB-FileWriter" t@116 at com.objectdb.o.SNP.D(SNP.java ... .objectdb.o.LFL.R(LFL.java:996) at com.objectdb.o.SFL.ah(SFL.java:998) - locked (a com.objectdb.o.LFL

behavior for pessimistic locking . The persistence provider must lock the database row(s ... strategy is used, or if the entity is otherwise mapped to a secondary table, this entails locking the row(s) for the entity instance in the additional table(s). Entity relationships for which the locked

that are contained in join tables will be locked if the javax.persistence. lock .scope property is specified ... will not be locked (unless those entities are explicitly locked ). Locking such a relationship or element collection generally locks only the rows in the join table or collection table

._OptimisticLockException: Optimistic lock failed for object model.UserSession#28 (object has version ... be wrong here. EDIT: Merge will attach Willks William Optimistic locking is enabled by ObjectDB automatically even if no version field is defined. You can disable optimistic locking checks  

Hi, ObjectDB looks interesting. Have two technical questions... (1) what locking model does ... you, Andrej andrej Andrej Gabara (1) what locking model does ObjectDB use? I.e. 2PL or MVCC? Do writers block readers? Do readers block writers? ObjectDB implements the standard JPA locking model

locking method that is used by ObjectDB 1.x. Try running ObjectDB in a process with no permission ... how to do this. And if write permission permission is blocked for the parent folder, won't ObjectDB locking method ... for the parent folder, won't ObjectDB locking method throw exceptions if it does not get the write permission

lock exception of the removed entity. If this operations on the entity are executed in only one plugin ... flushing changes to the database. You may also  disable optimistic locking checks   ... plugins. This leads to the optimistic lock exception. But the ObjectDB throws the changes of the entity

.java:176) com.objectdb.o.IXM.Yz(IXM.java:100) com.objectdb.o.MST.X(MST.java:1194) - locked com.objectdb.o.MST@1881a6d5 com.objectdb.o.MST.Z2(MST.java:1181) - locked com.objectdb.o.MST@1881a6d5 com.objectdb.o.IXA$1.run(IXA.java:418) - locked com.objectdb.o.LKM@7b5315ca

when EntityManager. lock is used with pessimistic locking is used and the entity no longer exists in the database ... .refresh EntityManager.refresh EntityManager.refresh EntityManager. lock EntityManager. lock Since: JPA 1.0

against the same objects being queried by the other client. Seems like some sort of locking problem ... locking is off dmoshal David Moshal update 1: problem persists if optimistic locking set to true in ... . It is possible that this is some sort of a locking issue. Notice that disabling version check

locking conflict occurs. This exception may be thrown as part of an API call, a flush or at commit ... .find EntityManager.find EntityManager. lock EntityManager. lock Since: JPA 1.0 Public Constructors

back TransactionRequiredException - if a lock mode other than NONE has been set and there is no transaction or 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

- if a lock mode other than NONE has been set and there is no transaction or 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

back TransactionRequiredException - if a lock mode other than NONE has been set and there is no transaction or ... - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking

the query timeout value set and only the statement is rolled back TransactionRequiredException - if a lock ... been joined to the transaction PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails and only the statement

back TransactionRequiredException - if a lock mode other than NONE has been set and there is no transaction or ... - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking

back TransactionRequiredException - if a lock mode other than NONE has been set and there is no transaction or ... locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails

JPA Method in javax.persistence.Query LockModeType getLockMode () Get the current lock mode for the query. Returns null if a lock mode has not been set on the query object. Return: lock mode Throws: IllegalStateException - if the query is found not to be a Java Persistence query language SELECT query or a Criteria API query Since: JPA 2.0

.objectdb.jdo.PMImpl.makePersistent(PMImpl.java:241) - locked (a com.spiffymap.naviupdate.model.Repository) - locked (a com.objectdb.jdo.PMImpl) sjzlondon Steve Zara Could you please post a full thread ... ) at java.lang.Thread.run(Thread.java:748) Locked ownable synchronizers: - locked (a java.util

JPA Method in javax.persistence.Query Query setLockMode (    LockModeType  lockMode ) Set the lock mode type to be used for the query execution. Parameters: lockMode - lock mode Return: the same query instance Throws: IllegalStateException - if the query is found not to be a Java

JPA Method in javax.persistence.EntityManager LockModeType getLockMode (   Object entity ) Get the current lock mode for the entity instance. Parameters: entity - entity instance Return: lock mode Throws: TransactionRequiredException - if there is no transaction or if the entity

JPA Method in javax.persistence.TypedQuery TypedQuery setLockMode (    LockModeType  lockMode ) Set the lock mode type to be used for the query execution. Parameters: lockMode - lock mode Return: the same query instance Throws: IllegalStateException - if the query is found not

JPA Enum Constant in javax.persistence.LockModeType OPTIMISTIC_FORCE_INCREMENT Optimistic lock , with version update. Since: JPA 2.0

JPA Enum Constant in javax.persistence.LockModeType OPTIMISTIC Optimistic lock . Since: JPA 2.0

locking conflict occurs that does not result in transaction rollback. This exception may be thrown as

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 NONE No lock . Since: JPA 2.0

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

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

JPA Enum Constant in javax.persistence.LockModeType PESSIMISTIC_READ Pessimistic read lock . Since: JPA 2.0

JPA Annotation Attribute in javax.persistence.NamedQuery LockModeType lockMode default NONE (Optional) The lock mode type to use in query execution. If a lockMode other than LockModeType.NONE is specified, the query must be executed in a transaction and the persistence context joined to the transaction. Since: JPA 2.0

-specific query hints. Since: JPA 1.0 LockModeType lockMode default NONE (Optional) The lock mode type

definition. This includes configuration information such as max results, hints, flush mode, lock mode

results, hints, flush mode, lock mode, result set mapping information, and information about stored

and the locking mechanisms used by the provider, this hint may or may not be observed. Parameters: hintName

and the locking mechanisms used by the provider, this hint may or may not be observed. Parameters

JPA Annotation Version Target: METHOD, FIELD Implemented Interfaces: Annotation Specifies the version field or property of an entity class that serves as its optimistic lock value. The version is used to ensure integrity when performing the merge operation and for optimistic concurrency control

directly to database update operations, bypassing any optimistic locking checks. Portable applications

blocked: 109 Total waited: 80 Stack trace: com.objectdb.o.PGC.C(PGC.java:484) - locked java.lang.Object ... :1056) com.objectdb.o.OBC.aK(OBC.java:969) com.objectdb.jpa.EMImpl.find(EMImpl.java:551) - locked ... .workflow.ObjectDbInstanceContainer.putIfAbsent(ObjectDbInstanceContainer.java:108) - locked rbccm.felix

) "The process cannot access the file because another process has locked a portion of the file" shows ... then the locker is another process, i.e. this is not a lock by your application process ... ObjectDB locks the database file when it is in use so accessing the database with the Explorer

that this happens when an optimistic lock exception is thrown during commit, and failed ( locked ... hgzwicker Hans-Georg Zwicker Which trace? The log just shows locations of optimistic lock exceptions ... when there is an optimistic lock exception on a large object (= ~2KB). Assuming you have ObjectDB 2.7.2

data store locks until commit time. Return: the value of the Optimistic property. Since: JDO 1.0 ... setOptimistic (boolean optimistic) Optimistic transactions do not hold data store locks until commit time

JDO Method in javax.jdo.Transaction void setOptimistic (   boolean optimistic ) Optimistic transactions do not hold data store locks until commit time. If an implementation does not support this option, a JDOUnsupportedOptionException is thrown. Parameters: optimistic - the value of the Optimistic flag. Since: JDO 1.0

JDO Method in javax.jdo.Transaction boolean getOptimistic () Optimistic transactions do not hold data store locks until commit time. Return: the value of the Optimistic property. Since: JDO 1.0