[birt-dev] Birt ODA Extension problem

["Jonas Bassl" <Jonas@xxxxxxxx>]

Hallo,

since quite a few weeks i am developing an ODA Extension for the Eclipse-Plugin Birt to connect to a database called Tamino from the company Software AG by handling and presenting response data from xqueries. Because of this being my first time to develop a project in that dimension, it cost me quite an effort to realize it, but i think, things are working well after solving some exceptions concerning the problem of creating plug ins and their dependencies in eclipse. Until now:

I open a new Birt Project in my eclipse environment and choose as new data source the database "Tamino" as i was implementing this. Than i create my new Data set by inserting the xquery, choosing the XPath _expression_ and defining the tables, i want to use for my report. After defining the tables i also can see the small preview of the data out of the database. But when I want to see the whole preview, Eclipse throws me the following lines:

[CODE]05.05.2008 18:42:26 org.eclipse.birt.data.engine.odaconsumer.ResultSet fetch
SCHWERWIEGEND: Cannot fetch the next data row.
The established connection to the data source is not active.
org.eclipse.datatools.connectivity.oda.consumer.helper.OdaHelperException: The established connection to the data source is not active.
    at org.eclipse.datatools.connectivity.oda.consumer.helper.OdaObject.newOdaException(OdaObject.java:522)
    at org.eclipse.datatools.connectivity.oda.consumer.helper.OdaResultSet.next(OdaResultSet.java:169)
    at org.eclipse.birt.data.engine.odaconsumer.ResultSet.fetch(ResultSet.java:115)
    at org.eclipse.birt.data.engine.executor.dscache.DataSetResultCache.cacheDataSet(DataSetResultCache.java:184)
    at org.eclipse.birt.data.engine.executor.dscache.DataSetResultCache.fetch(DataSetResultCache.java:159)
    at org.eclipse.birt.data.engine.executor.cache.OdiAdapter.fetch(OdiAdapter.java:146)
    at org.eclipse.birt.data.engine.executor.cache.RowResultSet.next(RowResultSet.java:91)
    at org.eclipse.birt.data.engine.executor.cache.ExpandableRowResultSet.next(ExpandableRowResultSet.java:62)
    at org.eclipse.birt.data.engine.executor.cache.SmartCacheHelper.populateData(SmartCacheHelper.java:268)
    at org.eclipse.birt.data.engine.executor.cache.SmartCacheHelper.initInstance(SmartCacheHelper.java:241)
    at org.eclipse.birt.data.engine.executor.cache.SmartCacheHelper.getResultSetCache(SmartCacheHelper.java:204)
    at org.eclipse.birt.data.engine.executor.cache.SmartCache.<init>(SmartCache.java:68)
    at org.eclipse.birt.data.engine.executor.transform.pass.PassUtil.populateOdiResultSet(PassUtil.java:135)
    at org.eclipse.birt.data.engine.executor.transform.pass.PassUtil.pass(PassUtil.java:66)
    at org.eclipse.birt.data.engine.executor.transform.pass.PassManager.doSinglePass(PassManager.java:185)
    at org.eclipse.birt.data.engine.executor.transform.pass.PassManager.pass(PassManager.java:90)
    at org.eclipse.birt.data.engine.executor.transform.pass.PassManager.populateResultSet(PassManager.java:72)
    at org.eclipse.birt.data.engine.executor.transform.ResultSetPopulator.populateResultSet(ResultSetPopulator.java:208)
    at org.eclipse.birt.data.engine.executor.transform.CachedResultSet.<init>(CachedResultSet.java:112)
    at org.eclipse.birt.data.engine.executor.DataSourceQuery.execute(DataSourceQuery.java:524)
    at org.eclipse.birt.data.engine.impl.PreparedOdaDSQuery$OdaDSQueryExecutor.executeOdiQuery(PreparedOdaDSQuery.java:338)
    at org.eclipse.birt.data.engine.impl.QueryExecutor.execute(QueryExecutor.java:761)
    at org.eclipse.birt.data.engine.impl.ServiceForQueryResults.executeQuery(ServiceForQueryResults.java:216)
    at org.eclipse.birt.data.engine.impl.QueryResults.getResultIterator(QueryResults.java:152)
    at org.eclipse.birt.report.designer.data.ui.dataset.ResultSetPreviewPage.populateRecords(ResultSetPreviewPage.java:458)
    at org.eclipse.birt.report.designer.data.ui.dataset.ResultSetPreviewPage.access$2(ResultSetPreviewPage.java:451)
    at org.eclipse.birt.report.designer.data.ui.dataset.ResultSetPreviewPage$5.run(ResultSetPreviewPage.java:407)
    at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:113)
[/CODE]

Now, when I click okay anyway, my new Data set seams to be created and I can define the layout from my report as usual. Just when i want to see the preview of the now layouted report, the console gives me few lines as follows:

[CODE]05.05.2008 18:45:44 org.eclipse.birt.report.engine.data.dte.DteDataEngine doExecuteQuery
SCHWERWIEGEND: Cannot fetch the next data row.
The established connection to the data source is not active.
[/CODE]

Well, one the one side, i am quite content for having at least any failure output as things haven't always been like that. But I am sitting on this exception for 2 days now and i still don't know what to do to avoid this problem and get the things working properly. When I look for the connection establishing by debugging, things seam to be quite okay.

As i still told, i am really new to develop projects of that dimension, so i only can imagine, that i either have missed some point in my implementation or i still don't understand what i am doing here, or both!
I would be glad, if someone can help me in this problem and maybe already has seen that exception. I also do not know, if this is the right place to ask my question.
Please give me at least some hints to work on this problem.

Regards,
Jonas