About Entity

forum_thread

Cache usage

after a runtime of several weeks we are now analyzing the usage of the cache and so on. Looking at the heap dump we suspect that the cache is really used (see heap dump attached), the RAM allocated by objectdb is much less than we would expect. The database file has around 25 GByte of size and there is heavy traffic of around 400 clients communicating permanently via webSockets to the objectdb. The config is attached as well. The question is: is the cache really used ? ... 2 cache  (cache level2="4096mb") About 90,000 entity objects are stored in that cache. They may take about 100MB, and anyway ...

 
forum_thread

Spring 4 setup

Can someone provide an example of setup ObjectDB embeded to be used with Spring4? Existing examples is like for Spring3 and I can't figure how to use ObjecDB in Spring tutorial: http://spring.io/guides/gs/accessing-data-jpa/   Thanx. ... </dependency > 2. The entity object can not ...

 
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IMK Stall with certain query

Hello, I am experiencing constant IMK Stall notifications from Java when using certain query: 2015-09-01 16:53:15.785 java[3678:5217999] IMK Stall detected, *please Report* your user scenario in <rdar://problem/16792073> - (imkxpc_deadKeyStateWithReply:) block performed very slowly (4.63 secs) i am sure it is linked with objectdb as these are thrown each time one particular query is used: #1 2015-09-01 15:04 Hello, I am experiencing constant IMK Stall notifications from Java when using certain query: ...

 
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zip file or JAR manifest missing

I found the message: Error opening zip file or JAR manifest missing: /E:/projects/ObjectDB/bin/objectdb.jar Some of projects can read the DB, but others can not read or write the DB. ... solution to this problem: Declare all your entity classes in a persistence unit . Specify the type as a ...

 
issue

JDO PersistenceManager.getSequence() returns null sometimes

When using JDO without annotations, database sequences are normally defined in the ORM file. Following discussion on the forum I was told that ObjectDB supports sequences if specified in the JDO file. Unfortunately, it doesn't seem to be supported consistently. It appears to work only in the situation that a new odb file has just been created AND something has been persisted to it. If nothing has yet been persisted, or if the odb file is not newly created, getSequence() returns null. Code to reproduce: ... out with NullPointerException the second time. Entity class, in package testcase: package testcase ;   ...

 
forum_thread

Internationalization

What would be a good way to implement internationalization with ObjectDB? Let's say we do have a product catalog and we need to provide category and product data internationally. With a relational database we most probably would have two tables, one for locale neutral information, i.e. Product with fields SKU, price, etc. and another one for locale information only, i.e. ProductLocale with fields name, description, etc. #1 2014-06-11 20:03 What would be a good way to implement internationalization with ObjectDB? Let's say we do have a prod ...

 
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String Encoding Issue

Hi all Encounter a character encoding issue when i try to retrieve a String column containing Chinese character. Retrieve a String column on odb file.  em = emf.createEntityManager(); Query query = em.createQuery("SELECT fu FROM FarmUnit fu"); But, when try to print the value out as: ... try to print the String field when you persist your entity object you will get the same result as printing the String values ...

 
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Possible issue with LAZY Loading

Hi, We need lazy loading for one of our large data sets. When I run currently against both 2.4.2 and 2.4.3_01 the db is always returning everything, including the data marked as Fetch.LAZY.  I wrote the attached unit test, and then found this: http://www.objectdb.com/database/forum/9 As far as I can tell, my unit test is pretty much identical. Not sure why this doesn't work. Thanks Paul. ... to the application. The additional data is accessible if entity objects are managed by an open EntityManager, but it is fetched lazily ...

 
forum_thread

locks on pure query activities

analyzing the dynamic behavior we can see from the thread dump that a lot of our threads that are just doing simple queries show locks like these (question is: why there are locks and how could we get rid of that):   log1:   #1 2017-04-28 09:28 analyzing the dynamic behavior we can see from the thread dump that a lot of our threads that are just doing simp ...

 
issue

com.objectdb.o.InternalException: java.lang.ArrayIndexOutOfBoundsException: null

Exception in thread "main" [ObjectDB 2.6.0_04] Unexpected exception (Error 990)   Generated by Java HotSpot(TM) 64-Bit Server VM 1.7.0_51 (on Windows 7 6.1). Please report this error on http://www.objectdb.com/database/issue/new com.objectdb.o.InternalException: java.lang.ArrayIndexOutOfBoundsException: null java.lang.ArrayIndexOutOfBoundsException at java.lang.System.arraycopy(Native Method) at com.objectdb.o.SEM.c(SEM.java:77) at com.objectdb.o.SEC.g(SEC.java:196) at com.objectdb.o.SEC.c(SEC.java:84)... 89772) Example Class: public @Entity class WebReference implements Serializable { ...