It turns out that my application was picking up an old repository.xml,
one that was actually just the user fragment. So, it started with a
class-descriptor. Since there was no DTD declared in the file, there
was no default value for isolation-level and, thus, the parser returned
null. Definitely an error on my part, but until I recompiled the code
with debugging on, I didn't even get an error message telling me what
was wrong with the file. So, I think that a change to trap and report
null values in the parsing would be very helpful.
Thanks for looking into this.
Armin Waibel wrote:
Hi
again,
maybe the problem could be the isolation-level set on
descriptor-repository element level (repository.xml file), this level
is used as default level in class-descriptor.
Do you set isolation-level attribute on this level? How does your
repository.xml file look like?
Should be something like that:
....
<descriptor-repository version="1.0"
isolation-level="read-uncommitted"
proxy-prefetching-limit="50">
<!-- include all used database connections -->
&database;
<!-- include ojb internal mappings here -->
&internal;
<!-- include user defined mappings here -->
&user;
</descriptor-repository>
It's also possible to include all mappings in the repository.xml file
without using !ENTITY-references.
When I run in debug mode I get
[org.apache.ojb.broker.metadata.RepositoryXmlHandler] DEBUG: startDoc
[org.apache.ojb.broker.metadata.RepositoryXmlHandler] DEBUG:
proxy-prefetching-limit: 50
[org.apache.ojb.broker.metadata.RepositoryXmlHandler] DEBUG: >
descriptor-repository
...
You get:
[org.apache.ojb.broker.metadata.RepositoryXmlHandler] DEBUG: startDoc
[org.apache.ojb.broker.metadata.RepositoryXmlHandler] DEBUG: >
class-descriptor
[org.apache.ojb.broker.metadata.RepositoryXmlHandler] DEBUG:
isolation-level: null
java.lang.ExceptionInInitializerError
regards,
Armin
Armin Waibel wrote:
Hi Larry,
hmm, stack trace says:
Caused by: org.apache.ojb.broker.metadata.MetadataException: Can not
read repository class descriptor data, using repository:
repository_user.xml
and
[org.apache.ojb.broker.metadata.RepositoryXmlHandler] DEBUG: >
class-descriptor
[org.apache.ojb.broker.metadata.RepositoryXmlHandler] DEBUG:
isolation-level: null
Seems your parser returns 'null' when attribute is not set or do you
set the class-descriptor 'isolation-level' attribute?
RepositoryXmlHandler does not check for 'null', seems other parser
return an empty string instead of 'null'. Will check in a fix ASAP.
regards,
Armin
Larry V. Streepy, Jr. wrote:
Please ignore the last posting, it was the
same file by mistake :-( The attached file contains the stack trace
with debug information enabled.
Thanks.
Larry V. Streepy, Jr. wrote:
I've got a very strange error cropping up
when I try to run a simple test program for OJB. Note that I can build
and execute the JUnit tests using the distribution and things work
fine. However, when I construct a simple batch file to include all the
jar files from the ojb "lib" directory and add in the directory that
contains the properties files I get a NullPointer exception during the
parse due to "isolation-level" being null. Now this appears to be an
internal table lookup, so I'm not sure how it can fail. Also, I copied
the repository.xml file from the OJB distribution as my starting point,
so the isolation-level attribute is being properly specified. I've
attached the debug output and the exception trace below. Any help or
insights would be appreciated.
Thanks.
--
Larry V. Streepy, Jr.
Senior Vice President and CTO
Health Language, Inc.
------------------------------------------------------------------------
[org.apache.ojb.broker.metadata.RepositoryXmlHandler] DEBUG: startDoc
[org.apache.ojb.broker.metadata.RepositoryXmlHandler] DEBUG: >
class-descriptor
[org.apache.ojb.broker.metadata.RepositoryXmlHandler] DEBUG:
isolation-level: null
java.lang.ExceptionInInitializerError
at
org.apache.ojb.broker.core.PersistenceBrokerFactoryBaseImpl.getDefaultKey(PersistenceBrokerFactoryBaseImpl.java:114)
at
org.apache.ojb.broker.core.PersistenceBrokerFactoryBaseImpl.defaultPersistenceBroker(PersistenceBrokerFactoryBaseImpl.java:196)
at
org.apache.ojb.broker.PersistenceBrokerFactory.defaultPersistenceBroker(PersistenceBrokerFactory.java:104)
at
com.staffmix.nurse.play.Application.<init>(Application.java:25)
at
com.staffmix.nurse.play.Application.main(Application.java:56)
Caused by: org.apache.ojb.broker.metadata.MetadataException: Can not
read repository class descriptor data, using repository:
repository_user.xml
at
org.apache.ojb.broker.metadata.MetadataManager.init(MetadataManager.java:135)
at
org.apache.ojb.broker.metadata.MetadataManager.<init>(MetadataManager.java:121)
at
org.apache.ojb.broker.metadata.MetadataManager.<clinit>(MetadataManager.java:110)
... 5 more
Caused by: org.apache.ojb.broker.metadata.MetadataException: Exception
when reading metadata information, please check your repository.xml
file
at
org.apache.ojb.broker.metadata.RepositoryXmlHandler.startElement(RepositoryXmlHandler.java:953)
at
org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown
Source)
at
org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown
Source)
at
org.apache.xerces.impl.XMLDocumentScannerImpl$ContentDispatcher.scanRootElementHook(Unknown
Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown
Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown
Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown
Source)
at
org.apache.ojb.broker.metadata.RepositoryPersistor.readMetadataFromXML(RepositoryPersistor.java:343)
at
org.apache.ojb.broker.metadata.RepositoryPersistor.buildRepository(RepositoryPersistor.java:300)
at
org.apache.ojb.broker.metadata.RepositoryPersistor.readDescriptorRepository(RepositoryPersistor.java:215)
at
org.apache.ojb.broker.metadata.MetadataManager.init(MetadataManager.java:131)
... 7 more
Caused by: java.lang.NullPointerException
at
org.apache.ojb.broker.metadata.RepositoryXmlHandler.getIsoLevel(RepositoryXmlHandler.java:1174)
at
org.apache.ojb.broker.metadata.RepositoryXmlHandler.startElement(RepositoryXmlHandler.java:223)
... 21 more
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Larry V. Streepy, Jr.
Senior Vice President and CTO
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