In eclipse, the "default implementation library" what jars files do I need to include if I do not want to use server runtime?
I'm refering to this tutorial http://help.eclipse.org/help33/index.jsp?topic=/org.eclipse.jpt.doc.user/task_create_new_project.htm
Follow Using TopLink JPA with Dali to get started with the Toplink Essentials (JPA reference implementation). To get the mentioned jars (toplink-essentials.jar and toplink-essentials-agent.jar), download them from there or, if you use Maven, from the Java.Net Maven Repository.
PS: Please note that after 2.0-b36, the toplink-essentials-agent.jar file is no longer needed as the agent facility is now integrated into toplink-essentials.jar. So you can do like below.
$ java -javaagent:toplink-essentials.jar client.Client
Depends on what implementation you want to use. There are currently three most popular implementations: Hibernate, TopLink and EclipseLink.
I know about hibernate that it's README file explains what jars are mandatory for what functions. If you use JPA you must have some sort of EntityManager (hibernate can be used without EntityManager too), so you need all the dependencies of it.
To download hibernate JPA implementation use this link (look for hibernate-entitymanager). You need hibernate core, annotations and entity manager for JPA. If you use all the jars in those three packages you should be ok. But I strongly suggest you to read the README files.
Related
I know the difference between JPA and specific implementation for example Hibernate or EclipseLink, but what I am interested in, when I download for example Eclipse JAVA EE version, and then in my project use javax.persistence package, which implementation does it use? My guess would be EclipseLink or OpenJPA but how do I know?
I am interested in this because I compared performance of Hibernate and javax.persistence package (just few thousand of rows from db) and the performance gap from my point of view was quite big (about a second)
You can choose it in the JPA Facet pane by using the Platform dropdown. See Eclipse documentation.
If you want to use Hibernate, you have to add it manually in the Eclipse Marketplace. See: JPA Creation - Hibernate not showing in platform
Eclipse EE will bundle EclipseLink via the JPA facet you can add to a project, but other than that it doesn't really provide any specific implementation (you can configure it to provide other implementations if you configure with facet with other user libraries). Your implementation is provided either by libraries, or your app server that you are deploying to. For longer term, a more strategic approach would be to explicitly include an implementation either through dependencies (maven) or referring to/using libraries provided by your app server.
To keep it short and sweet:
There is hibernate-commons-annotations 4.1.0-Final and hibernate-annotations 3.5.6-Final.
I'm a nub, what's the difference between them, and do I need them both?
Trying to "avoid" JPA and by that I mean using the JPA 2.0 standards embedded within Hibernate.
Thanks!
Previously, hibernate-annotations was released and versioned from hibernate core. But from version 3.5 and up it is included with hibernate core. And for some reason it was still released from 3.5.0 to 3.5.6 but you do not need it anymore.
And coming to hibernate-commons-annotations, it is a utility project used by annotations based hibernate sub-projects. It is used by other hibernate projects like hibernate-search and thus is maintained as a separate project and it is a compile time dependency for hibernate-core v3.6.0 and up.
Source 1
Source 2
Hibernate Commons Annotations is "Utility project for annotation handling", as said for example here. It does not contain such API that normal user of Hibernate should use.
Hibernate annotations contained persistence mapping annotations and related code. Nowadays it is merged to Hibernate core.
If you really want to avoid JPA (1/2) that is easily done by not using classes from javax.persistence package or from its subpackages. If you want opposite, use javax.persistence and avoid org.hibernate packages where possible.
Good guide to get started with Hibernate can be found from http://docs.jboss.org/hibernate/orm/4.1/quickstart/en-US/html_single/. It also tells which libraries are needed always and which ones are optional.
Reference documentation contains plenty of advices about using JPA instead of deprecated legacy Hibernate annotations.
I am using spring 2.5 with HibernateDaoSupport. My doubt is, do I still require Hibernate jar files for support of HibernateDaoSupport.
I did a sample example in netbeans. I unchecked the hibernate jar library and the application is still working.
But is it correctly working with the HibernateDaoSupport class without using Hibernate jar files..
HibernateDaoSupport is present in Spring jars. It is used to provide support to Hibernate-based data access objects. If you plan in using Hibernate for read/write into DB, you will require the hibernate jar.
Please check out the following link for more details:
http://www.vaannila.com/spring/spring-hibernate-integration-1.html
you need to put org.springframework.orm_x.x.x.RELEASE.jar file in your project
I am a bit confused about using the jars to handle database part in Java development:
In my current project, these three jars are being used:
1) ejb3-persistance.jar (#Entiry #Table annotations are taken from this)
2) hibernate3.jar
3) spring-core.jar (JdbcDaoSupport is used from this jar)
Please explain me the details usage of including these jars. (I want to understand the persistance framework in detail).
Please help.
Those annotations are "standard" ejb3 annotations.
Hibernate is the specific ORM being used (it will leverage the "standard" annotations)
Spring is providing the JDBC connection that Hibernate is using.
For more details about what each of these three component frameworks does, I would suggest you visit their respective projects and read their documentation. It's too much for SO.
I am using openjpa runtime of JPA specification.
At development time I am using annotations to configure jpa entities.
At Integration, Pre-Production and and Production environment, I am using orm mapping files to configure entities. Please suggest a tool which can generate mapping files from jpa annotations, so that these mapping files can be manually edited for different environment.
If there is already a opensource maven-plugin; will be great.
I don't really know OpenJPA so there is maybe a better way to do this but one option would be to first generate the XML schema file from annotated entities using the Schema Tool and then the orm.xml file from the schema.xml using the Reverse Mapping Tool. Actually, this process is discussed in this thread.
I've checked the OpenJPA Maven Plugin but it doesn't seem to support the Reverse Mapping part (it only has a openjpa:schema goal that allows to Create a file which contains the schema mapping XML, the first required operation, but nothing for the second part). Extending the plugin to add the missing openjpa:reverse-mapping goal would thus require some development but it shouldn't be an hard task.
There is another option though. OpenJPA provides the following Ant tasks for both operations:
org.apache.openjpa.jdbc.ant.ReverseMappingToolTask
org.apache.openjpa.jdbc.ant.SchemaToolTask
So it should be possible to call them from Maven using the Maven AntRun Plugin. Check the documentation for more details on how to use them.