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Storing JPA Entity Objects

is thrown. The exception is thrown either by persist (if that existing entity object is currently
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What are the system requirements for using ObjectDB?

ObjectDB requires Java 5 or later (Java 6 is preferred). As a pure Java application, ObjectDB should be able to run on any platform that supports the Java Standard Edition. Either the Java Development Kit (JDK) or the Java Runtime Environment (JRE) can be used. A version of ObjectDB for .NET is currently under development.
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Database Doctor

is not in the current directory a path to it has to be specified. The tool main class is com.objectdb
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Entity Management Settings

, even if it is not specified explicitly at the command line. This is currently an experimental feature
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Online Backup

on the server side). A new subdirectory with a name that reflects the current date and time (e.g
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Paths and Types in JPQL and Criteria API

, the current FROM variable (or FROM tuple when there are multiple variables) is simply skipped
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GROUP BY and HAVING clauses

. Only identification variables and path expressions are currently supported in the GROUP BY clause by
0

Java EE JPA Tutorial - Maven Project

The current directory should be guestbook-jee6. You will have to deploy the generated WAR file in
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Getting Started with JPA - Maven Project

and run the application from the command line by: > mvn test The current directory
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Spring MVC JPA Tutorial - Maven Project

the zip and run the application from the command line: > mvn package jetty:run The current directory

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

Need Help?

  1. Search ObjectDB website
  2. Read the FAQ
  3. Follow the Tutorials
  4. View or post in the forum
  5. Search or file an issue
  6. Contact support