About Java

forum_thread

alter table

Hi: After a table built by real data, how to alter table structure, such as: alter table add column ... alter table add index ... TIA ... ObjectDB Support ObjectDB - Fast Object Database for Java (JPA/JDO) edit ... ObjectDB Support ObjectDB - Fast Object Database for Java (JPA/JDO) edit ...

 
forum_thread

The server cannot start in CentOS

Hi, I try to run ObjectDB from Linux, but failed. My command is: java -cp objectdb.jar com.objectdb.Server start The result is attached. After typing the command, the system seems halting. ... ObjectDB from Linux, but failed. My command is: java -cp objectdb.jar com.objectdb.Server start The result ... If you want to start it in the background, try: java -cp objectdb.jar com.objectdb.Server start & ...

 
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Log4j error

Hi, We are using OBjectDB OEM Enhancer as part of our build process and we encountered following log4j error: ... entities for use in ObjectDB      [java] log4j:ERROR A "org.apache.log4j.xml.DOMConfigurator" object is not ... variable.      [java] log4j:ERROR The class "org.apache.log4j.spi.Configurator" was loaded by      [java] log4j:ERROR [com.objectdb.o.BCL@7fdcde] whereas object of type ...

 
forum_thread

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. ... jpa . JpaQuery . getSingleResult ( JpaQuery. java : 620 ) at src. run . txt2db . lookup ( txt2db. java : 82 ) at src. run . txt2db . main ( txt2db. ...

 
forum_thread

500Mb ObjectDb database opening issue

Hi, I have observed that 500 Mb objectDb database opening time is very slow (~3 seconds) for following code m_EntityMgrFactory = Persistence.createEntityManagerFactory( "objectdb:" + aFilename ); m_EntityManager = m_EntityMgrFactory.createEntityManager(); Does exist any way to speed-up open time for big databases? Definitely, it's too long for 500 Mb database! ... for us! INFO : ( AppDataStoreManager. java : 277 thread : Thread - 8 ) : doOpenDataStore ... ObjectDB Support ObjectDB - Fast Object Database for Java (JPA/JDO) edit ...

 
tutorial

Getting Started with JPA and NetBeans

Getting started tutorial for quick start with using Java Persistence API (JPA) in NetBeans.... and  y . For this tutorial, besides the Java JDK (5 or above) and the NetBeans IDE (any bundle that includes Java is expected to work), you only need to download and extract the ...

 
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Client server mode no longer works after JRE install

Hi I had client server mode working with no problems with my application. Then suddenly I was getting the following error "Error: missing 'server' at 'C:\Program Files\Java\jre7\bin\server\jvm.dll' on a client machine. It worked in embedded mode but not client server mode. ... "Error: missing 'server' at 'C:\Program Files\Java\jre7\bin\server\jvm.dll' on a client machine. It worked in embedded ... After investigating I found that the new version of java on the machine was a jre with no bin\server folder. If I removed java from ...

 
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Unable to convert 1.x odb file to 2.x

Hi, my company is just about to switch from ObjectDB 1.04.2487 (SE) to ObjectDB 2. So I downloaded the objectdb-2.5.5_02, activated it with our licence, enhancing went well, but then on converting 1 of the DB files I got this error: ... on converting 1 of the DB files I got this error: java -jar converter.jar ../old.odb ../new.odb ObjectDB 1.0 - > 2.0 file conversion Exception in thread "main" java .lang.RuntimeException: Internal Exception at ... ( OldTypeInfo. java :266 ) at com.objectdb.conv1.type.OldTypeManager.skipElement ...

 
api-jdo

JDO Reference (JavaDoc)

Java/JDO API Reference (based on the JDO 2.2 JavaDoc) This reference contains the API documentation (similar to JavaDoc) of JDO 2.2. The content is derived from the original JDO documentation with some additions and notes. The most basic JDO types are: javax.jdo.JDOHelper j ...

 
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Async query ObjectDb

1. Is it possible to run async objectDb queries for long time operations and stop them if it necessary? 2. Is it possible to stop sync ObjectDb query from another thread for long for example getResultList()? ... operation for example getResultList()? Link to Java API: http://docs.oracle.com/javase/7/docs/api/java/sql/Statement.html Symphony Teleca (Harman) ...