Hi,I am writing a handy tools with a simple user interface. It can verify
persistence.xml and annotation setting of the classes of. Also, it can run JPQL
like the SQL browser.In this case, I implemented a basic classloader to load
those persistence entity classes from Jar files, which were configurable from
UI. Here are my initial thoughts:1. Classloader will load OpenJPA and
persistence classes.-- I tried. My classloader is too simple to make a perfect
support of every requirement from OpenJPA. It failed when it was loading
FactoryBroker. After I inject my classload to Thread, I still have the
following error: "Caused by: <0.0.0 fatal general error>
org.apache.openjpa.persistence.PersistenceException: There was an error when
invoking the static getInstance method on the named factory class
"org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory". See the nested exception
for details." "Caused by: java.util.MissingResourceException:
org.apache.openjpa.persistence.PersistenceProductDerivation:java.lang.NullPointerException"2.
Classloader load persistence classes only.-- I didn't find a way to have a
special class loader to load the persistence entity class in OpenJPA. Does any
one have experience on that? Maybe we can have an entrance in
OpenJPAPersistence for specified classloader by user.Thanks,Gene.
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