Cool! That's very nice and it makes sense that starting a new JVM
changes the class loader issue. Notice the ant lib directory includes
xercesImpl.jar (ant 1.7.1). That also explains why the OpenJPA examples
work because the examples build.xml has fork=yes.
Thanks for figuring that out. Might help the next poor developer that
hits this. :-)
- Paul
On 3/26/2009 9:05 AM, Rick Curtis wrote:
Paul -
I don't fully understand whats going on, but I found what is causing the problems. When you launch
your java application, you don't fork the JVM. Adding fork="yes" to <java
classname="com.s... > made the problems go away.
If you google around, you'll find other people having this very problem.
-Rick
Hi Rick -
What I think is happening is that most containers have the JAXP jar
files, but if you run it standalone from the console this issue shows
up. There was an evolution from java 1.4 to 1.5 that changed how this
works. There are a lot of posts if you google it, but I'm no clear on
the what the configuration trick is so you don't have to have xercesIml.jar.
Attached is is a bare bones zip file. Directions -
- Add the jars from OpenJPA 1.2.1 to the lib directory and your JDBC driver
- Create a database with the test_person table for class
com.steelhead.lg.test.Person
- Edit src/java/META-INF/persistence.xml with your connection properties
- type "ant TestJPA"
This should work. If you remove the two sysproperty elements from the
ant build.xml then it fails with
javax.xml.parsers.FactoryConfigurationError unless you add
xercesImpl.jar to the lib directory.
I'm using Java SE 1.6.0_12. I had the same problem with Java 1.5.0_05.
Also had the same issue with OpenJPA 1.2.0.
I'm using Postgres 8.2.13 but I had the same problem with MySql 1.31 so
probably the database does not matter.
As I said, the OpenJPA hellojpa example works for me without
xercesImpl.jar so that adds to the mystery.
- Paul
On 3/23/2009 11:42 AM, Rick Curtis wrote:
Paul-
<br>If you still are unable to figure out what's going on, feel free to zip up
your simple test app and I'll take a look at it.
<br><br>-Rick
<br><blockquote class="quote light-black dark-border-color"><div class="quote
light-border-color">
<div class="quote-author" style="font-weight: bold;">Paul Copeland wrote:</div>
<div class="quote-message shrinkable-quote">Hi Rick -
<br><br>Thanks. As I mentioned the openjpa example hellojpa also works for me
<br>WITHOUT the xerces jar. But my very simple test app does not work with
<br>xerces. However, I found out that if I add these two properties to my
<br>runtime ant task then I do NOT need the xerces jar.
<br><br> <sysproperty key="javax.xml.parsers.SAXParserFactory"
<br>value="com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl"/>
<br> <sysproperty key="javax.xml.parsers.DocumentBuilderFactory"
<br>value="com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl"/>
<br><br>There is some classloader subtlety that I don't fully understand here.
<br><br>- Paul
<br><br>On 3/23/2009 8:17 AM, Rick Curtis wrote:
<br>> Paul -
<br>> I quickly looked through the javadoc for the
<br>> http://java.sun.com/javase/6/docs/api/javax/xml/parsers/SAXParserFactory.html#newInstance( )
<br>> SAXParserFactory and I'm thinking that your problem is something
specific
<br>> to your environment.? I was able to run the examples on my box without
<br>> adding xercesImpl.jar to my classpath. With my JSE1.6 install,
<br>> SAXParserFactoryImpl is found in the [java_home]\lib\rt.jar.
<br>>
<br>> -Rick
<br>>
<br>> Paul Copeland wrote:
<br>>
<br>>> More info on this. I upgraded to Java SE 1.6.0_12 and I still need the
<br>>> same jars (including xerces).
<br>>>
<br>>> Using OpenJPA 1.2 -
<br>>>
<br>>> 1) Only two jars are needed to compile my (very simple) test
application -
<br>>>
<br>>> - openjpa-1.2.0.jar
<br>>> - geronimo-jta_1.1_spec-1.1.jar
<br>>>
<br>>> 2) At runtime (standalone, not in a container) I also need these
jars
<br>>> (plus JDBC driver of course) -
<br>>>
<br>>> - serp-1.13.1.jar
<br>>> - geronimo-jta_1.1_spec-1.1.jar
<br>>> - commons-collections-3.2.jar
<br>>> - commons-lang-2.1.jar
<br>>> - xercesImpl.jar
<br>>>
<br>>> 3) When I build and run the apache-openjpa-1.2.0/examples/hellojpa
<br>>> (Derby example) I do NOT need xerces.
<br>>> ....
<br>>>
<br>>>
<br>>
<br>>
<br></div>
</div></blockquote>
