I'm am using a combination of Hibernate libraries and Java Entities to access my database, and I am having some strange problems. I hope someone can point me in the right direction....
My development environment is Eclipse (but I'm relatively new to Eclipse so I may be doing some things wrong with that too...) and Vaadin.
Most of my programs work fine. I have generated JPA classes from my database tables, and Eclipse creates a 'persistence.xml' file. And it mostly works. The problem is that the persistence.xml file looks something like this:
Code:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="VRSN_Entities" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>com.vrsn.Graph</class>
..... more class definitions here....
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:<port><database>"/>
<property name="hibernate.connection.username" value="dbUser"/>
<property name="hibernate.connection.password" value="dbPassword"/>
</properties>
</persistence-unit>
</persistence>
This works fine until I deploy it to a system where outgoing Port 80 requests are blocked (security policy). Then the system hangs trying to get to xmlns="http://java.sun.com/xml/ns/persistence" etc.
So I tried changing that line in persistence.xml to just this:
<persistence version="2.0">
Now every
other time that I compile this library, Eclipse gives me an error that says that persistence.xml does not have a valid format. But if I delete the error and recompile, it works. And when I include this library in a web project, it also works - most of the time.... The really strange problem is that I have 2 web programs with identical login screens (as far as I know). One calls the database to get a user record and it works. The other calls the same routine (based on print statements in my log file) and then fails with:
Error parsing XML: XML InputStream(2) cvc-elt.1: Cannot find the declaration of element 'persistence'.
And I have no idea why one works and the other doesn't. Can anyone help me figure that out?
More important, is there something I can put in the persistence.xml file that will make Eclipse think the format is correct? I can copy the validation files from oracle and store them somewhere - but they would need to be accessible to the persistence file - how would I specify that and where should I put them?
I've been beating my head against a wall on this for some time now - I'd appreciate any help anyone can give me...
thanks,
nbc
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