I'm trying to create a simple EclipseLink POC. Unfortunately, it doesn't seem to include important, basic classes within the JAR.
For example, the following fails within eclipse (and eclipselink is definitely on the build path): import javax.persistence.Id. Should I have a basic-JPA-functionality jar as well? Are annotations stored somewhere else within eclipselink (I've looked, can't find anything)? What am I missing?
Thanks
API part is missing. Name of jar is javax.persistence_1.0.0.jar. In EclipseLink 2.4.1 (http://www.eclipse.org/eclipselink/downloads/index.php#2.4 Installer zip) download it is located to eclipselink/jlib/jpa/javax.persistence_1.0.0.jar.
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I am working on a project in which an enterprise archive (ear) deployed on a JBoss server needs to compile (and run) a class dynamically. I am using the JavaCompiler class to do this - the complication comes from the fact that the class being compiled has references to some of the classes contained within the ejb jar within the ear.
This is not a problem when the deployed ear is 'exploded' on deployment, so it is just a directory rather than an archive - in this case I am able to specify the required jar in the -classpath option of the compiler, and compilation works fine. Unfortunately due to constraints of the systems I am working with, it is not an acceptable solution to deploy these ears 'exploded', and the compiler seems not to be able to 'see' the required jar when it's wrapped up in an archive.
Given that the dynamic compilation is taking place from the ear in question, and therefore the system's class loader has access to the contents of the required jar, is there any way I can tell the compiler to just use the classes as loaded by the system class loader?
I appreciate this is something of a wordy question, but any help would be appreciated.
Thanks
It seems that there is no simple way to have the JavaCompiler load dependencies of compiled code from a ClassLoader. However, one could implement JavaFileManager directly and redirect the operations for the StandardLocation.CLASS_PATH using resource lookups on the context ClassLoader (getResource(<class/resource name>)). This would withdraw the limitation of StandardJavaFileManager directly operating on Files.
Someone already seems to have prototypically implemented that approach:
http://atamur.blogspot.de/2009/10/using-built-in-javacompiler-with-custom.html
In Netbeans 7.2.1 i've created a new java project
In the project properties, in the libraries section, i've added "EclipseLink (JPA 2.0)" that is a library that ships with Netbeans (at least with this version).
But javadoc isn't provided so, for example, when i try to instantiate an EntityManagerFactory:
Persistence.createEntityManagerFactory(String string Map map)
i can't get support, so eventually i don't know what i am expected to pass into the map argument.
How can i determine the correct javadoc file/s to add and where can i find it?
Solution attempt 1
As far as i can see, there is no reference to the url of the project inside the library, so you are supposed to get this information in other places.
Once i've got the information (http://www.eclipse.org/eclipselink/api/2.5/index.html), i downloaded the zip file and i put in a local directory:
/home/homersimpson/NetBeansLibraries/EclipseLink (JPA 2.0)/eclipselink-javadocs.zip
Then, in NetBeans Ant Libraries, i've added, for the "EclipseLink (JPA 2.0)" the zip file to the sources.
I still cannot get help for class: javax.persistence.Persistence
but in the .zip file i have:
javax/persistence/Persistence.html
I assume NetBeans needs to source to show you the java docs. So ensure you include the source code jar for JPA.
For online java docs see,
http://www.eclipse.org/eclipselink/api/2.5/index.html
How I can setup Hibernate for a Dynamic Web application by using Eclipse Helios? I am a newbe so please let me know if there is any example.
I tried for Java application and included all JARS and it worked fine. But don't understand how I can do it for Web application and test it.
I will use Struts2 so I will appreciate if I can get appropriate example or guidance.
Drop the jars in WEB-INF/lib. Those jars are automatically added by Eclipse to the project build path, and constitute (with the WEB-INF/classes directory and the container classpath) the classpath of the webapp.
http://hardik4u.wordpress.com/2008/09/02/struts-2-hibernate-3-integrationcomplete-using-eclipse/
https://stackoverflow.com/questions/4364923/struts2-and-hibernate-framework-create-in-eclipse
First, download Struts2, and import example WAR file into Eclipse. You can find it from the source folder: struts-2.3.1-all\struts-2.3.1\apps\struts2-blank.war
Second, you should install Eclipse Hibernate Plugin. Goto Window > Preferences > Install/Update > Available Software Sites and add following link and name it JBossTools or something.
http://download.jboss.org/jbosstools/updates/helios/
Depending on your needs you can install Hibernate Plugins for many project types. In this case, select web application plugin.
And after, you should include Hibernate Core libraries into your classpath. I would recomment Hibernate 3.6 and greater. Because it does not depend on asm (asm-3.3.jar, asm-commons-3.3.jar ...) anymore. If you use earlier versions you might encounter some problems, since Struts2 also depend on asm libraries.
Then create your database, and use following link to configure and generate model bean classes.
http://casteyo.wordpress.com/2007/06/06/conf_hibernate/
Now you don't need to write mapping files by yourselves. And with DAO factory pattern you have your way to finish your project.
Hope this helps, and Goodluck
I am struggling with the configuration of the Eclipse Dali plugin and Hibernate. The version I'm using is as recommended:
Eclipse 3.6.1 (Helios SR1) IDE for Java EE Developers (including Dali 2.3)
JBoss Tools 3.2 (for the Hibernate Tools plugin)
When configuring the Java Persistence properties for my project, I created a user library named "Hibernate JPA" and included the following JARs:
hibernate-distribution-3.6.1.Final\hibernate3.jar
hibernate-distribution-3.6.1.Final\lib\jpa\hibernate-jpa-2.0-api-1.0.0.Final.jar
hibernate-distribution-3.6.1.Final\lib\required\dom4j-1.6.1.jar
hibernate-distribution-3.6.1.Final\lib\required\slf4j-api-1.6.1.jar
hibernate-distribution-3.6.1.Final\lib\required\javassist-3.12.0.GA.jar
hibernate-distribution-3.6.1.Final\lib\required\commons-collections-3.1.jar
hibernate-distribution-3.6.1.Final\lib\required\antlr-2.7.6.jar
hibernate-distribution-3.6.1.Final\lib\required\jta-1.1.jar
As long as the hibernate-distribution-3.6.1.Final folder is outside of my project directory, everything works fine. However, if I put the Hibernate folder into the project directory, I get an error saying "Required class org.hibernate.SessionFactory does not exist in selected libraries":
The error text is wrong, the required class is definitely included in hibernate3.jar, and everything works as expected when I move the JARs outside of my project directory.
I have two questions about that:
I do not understand why the User Library behaves differently depending on whether the JARs are placed inside or outside of my project directory. Could anybody explain what's happening here?
I would like to have my project in SVN, including all the required libraries. Is there any way to configure Dali to accept User Libraries within the project directory?
Thank you very much.
I was having the same problem cos I forgot to add hibernate-jpa-2.0-api-1.0.0.Final.jar.
The only difference is that I'm using 3.5.1-Final cos 3.6.x seems not stable at the moment.
Actually, I'd prefer EclipseLink: everything works fine as a charm. I've wasted many hours with environment configuration :( Last time I've used Hibernate was years ago and looks like troubles to configure still are the same :(
I'm confused about class visibility in OSGi. I'm running Apache Felix and loading the following bundles:
the antlr, asm, jpa and core bundles from eclipselink
an OSGi-fied jar for javax.persistence 1.99
an OSGi-fied jar with the com.mysql.jdbc driver
a bundle of my own that contains annotated entity classes and a persistence.xml
another bundle of my own that calls Persistence.createEntityManagerFactory(String, Map)
Now, what I'm confused about is which bundle must be able to see the MySQL driver. I thought this would be the bundle creating the EntityManagerFactory, but I get ClassNotFound errors when I import in that manifest. Next, I tried importing it from the eclipselink jpa bundle's manifest, but wrong again. Only when I import it from the manifest of the bundle containing the persistence unit (entity classes and persistence.xml), it works.
So, seemingly the database driver is looked up by the clasloader for the PU's bundle, but that doesn't make sense to me. What's going on?
I can't seem to find a straightforward documentation for this. These slides give some hints, but aren't exactly comprehensive.
I'm familiar with the OSGi classpath issues around Hibernate and JDBC and I can give you my reasoning on what's happening based on the slides you linked to.
I'm assuming you've added the JDBC driver entry to the persistence.xml inside your PU bundle?
EclipseLink is using the extender pattern to do work on the PU bundle's behalf. The extender is listening for bundles starting, checking if they have a persistence.xml and then doing the work of setting it up. It expects the PU bundle to import all the types you may reference in the persistence.xml, including the JDBC driver.
Think about it. The EclipseLink bundle won't import every known JDBC driver (and it shouldn't) - only your bundles can know which database driver they need, so it's reasonable to expect your PU bundle to import the JDBC driver class.
You shouldn't need to modify the manifests of the 3rd-party libraries if they are already OSGi-ified, such as EclipseLink.
I found this pdf to be quite informative regarding classloading:
http://www.martinlippert.org/events/WJAX2008-ClassloadingTypeVisibilityOSGi.pdf