The following issue has been updated:
Updater: James Carman (mailto:[EMAIL PROTECTED])
Date: Sun, 3 Oct 2004 4:51 PM
Comment:
Hey, guys. Here's a sneak peak of the code that I'm writing for TSS.com about
HiveMind. It contains code that I've been working on which integrates
Hibernate and HiveMind. I would love to have any suggestions, comments. This
zip file contains an Ant build file. You should modify the build.properties
file (database settings, deploy location, etc) if you want to actually install
and run the example webapp. You'll need to run the "get-dependencies" task
first (hopefully you're not behind a proxy server, because I didn't account for
that yet). This is an example of what I have in mind with respect to support
for Hibernate in HiveMind. Of course, we might want to change the names of
some of the interfaces/classes (to protect the innocent). One thing I don't
particularly like is the duplication of code between the TransactionInterceptor
(a service interceptor) and TransactionFilter (a servlet filter) classes, but I
think it's the easiest way to implement what we need without adding new
classes/interfaces. I created a class called HibernateSessionWrapper which
wraps a Hibernate session and provides many of the common operations you might
need WITHOUT the checked exceptions (they throw runtime exceptions instead).
Anyway, please check it out and let me know what you think.
Changes:
Attachment changed to hivemind-article.zip
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For a full history of the issue, see:
http://issues.apache.org/jira/browse/HIVEMIND-54?page=history
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View the issue:
http://issues.apache.org/jira/browse/HIVEMIND-54
Here is an overview of the issue:
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Key: HIVEMIND-54
Summary: Request for built-in support for Hibernate in HiveMind lib
Type: New Feature
Status: Open
Priority: Major
Project: HiveMind
Components:
documentation
examples
hivebuild
Assignee: Howard M. Lewis Ship
Reporter: Yuxiang Bu
Created: Mon, 13 Sep 2004 2:24 AM
Updated: Sun, 3 Oct 2004 4:51 PM
Description:
Request for adding build-in support for Hibernate Session and Transaction
management in HiveMind lib.
Since Hibernate is so popular now, I believe it will become a hot request.
At first I try to develop an HibernateInterceptorFactory service using
javassist.
But I found javassist cannot support "finally" yet. And the target code like
this:
boolean isTransactionBegunInThisMethod = false;
try {
isTransactionBegunInThisMethod = tm.beginTransaction();
Object result = _inner....
if (isTransactionBegunInThisMethod)
tm.commitTransaction();
return result;
} finally {
if (isTransactionBegunInThisMethod)
tm.rollbackTransaction();
}
And I cannot develop similar codes in javassist.
Then I developed an Interceptor with JDK proxy.
However, the interceptor cannot be used after HiveMind LoggingInterceptor.
The Registry successfully applies my HibernateInterceptor to service but fail
to apply the Logging Interceptor.
org.apache.hivemind.ApplicationRuntimeException: Unable to construct service
doconline.Adder: Unable to lookup $Proxy0: $Proxy0
at
org.apache.hivemind.impl.servicemodel.AbstractServiceModelImpl.constructNewServiceImplementation(AbstractServiceModelImpl.java:156)
......
Caused by: org.apache.hivemind.ApplicationRuntimeException: Unable to lookup
$Proxy0: $Proxy0
at
org.apache.hivemind.service.impl.CtClassSource.getCtClass(CtClassSource.java:60)
at
org.apache.hivemind.service.impl.ClassFabImpl.addField(ClassFabImpl.java:71)
at
org.apache.hivemind.service.impl.LoggingInterceptorFactory.createInfrastructure(LoggingInterceptorFactory.java:236)
......
Caused by: javassist.NotFoundException: $Proxy0
at javassist.ClassPoolTail.openClassfile(ClassPoolTail.java:300)
at javassist.ClassPoolTail.checkClassName(ClassPoolTail.java:177)
at javassist.ClassPool.checkClassName(ClassPool.java:709)
at javassist.ClassPool.get0(ClassPool.java:572)
at javassist.ClassPool.get(ClassPool.java:561)
at
org.apache.hivemind.service.impl.CtClassSource.getCtClass(CtClassSource.java:56)
... 48 more
The problem seems occurs when javassist want to find the class file in
classpath but cannot find it( Of course it cannot ).
If I put Transaction Interceptor before the Logging Interceptor, all works well.
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