birt 配置动态数据源

项目中使用3.7.1的birt。

因为项目需要在birt中配置动态数据源，因此在网上搜索了一下动态数据源的配置方法，按网上的说明，在数据源的beforeopen事件中添加类似如下代码：

importPackage( Packages.java.io );
importPackage( Packages.java.util );
fin = new java.io.FileInputStream(new String("d:/config.txt"));
props = new java.util.Properties( );

props.load(fin);
extensionProperties.odaDriverClass = new String(props.getProperty("driver"));
extensionProperties.odaURL = new String(props.getProperty("url"));
extensionProperties.odaUser = new String(props.getProperty("username"));
extensionProperties.odaPassword = new String(props.getProperty("password"));
fin.close();

结果一跑，出错：

严重: Unable to open connection.
org.eclipse.birt.report.data.oda.jdbc.JDBCException: Cannot load JDBC Driver class: org.mozilla.javascript.NativeJavaObject@1430f3.
	at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.findDriver(JDBCDriverManager.java:782)
	at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.registerDriver(JDBCDriverManager.java:903)
	at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.loadAndRegisterDriver(JDBCDriverManager.java:885)
	at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.doConnect(JDBCDriverManager.java:248)
	at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.getConnection(JDBCDriverManager.java:214)
	at org.eclipse.birt.report.data.oda.jdbc.Connection.connectByUrl(Connection.java:237)
	at org.eclipse.birt.report.data.oda.jdbc.Connection.open(Connection.java:162)
	at org.eclipse.datatools.connectivity.oda.consumer.helper.OdaConnection.open(OdaConnection.java:250)
	at org.eclipse.birt.data.engine.odaconsumer.ConnectionManager.openConnection(ConnectionManager.java:165)
	at org.eclipse.birt.data.engine.executor.DataSource.newConnection(DataSource.java:224)
	at org.eclipse.birt.data.engine.executor.DataSource.open(DataSource.java:212)
	at org.eclipse.birt.data.engine.impl.DataSourceRuntime.openOdiDataSource(DataSourceRuntime.java:217)
	at org.eclipse.birt.data.engine.impl.QueryExecutor.openDataSource(QueryExecutor.java:407)
	at org.eclipse.birt.data.engine.impl.QueryExecutor.prepareExecution(QueryExecutor.java:317)
	at org.eclipse.birt.data.engine.impl.PreparedQuery.doPrepare(PreparedQuery.java:455)
	at org.eclipse.birt.data.engine.impl.PreparedDataSourceQuery.produceQueryResults(PreparedDataSourceQuery.java:190)
	at org.eclipse.birt.data.engine.impl.PreparedDataSourceQuery.execute(PreparedDataSourceQuery.java:178)
	at org.eclipse.birt.data.engine.impl.PreparedOdaDSQuery.execute(PreparedOdaDSQuery.java:145)
	at org.eclipse.birt.report.data.adapter.impl.DataRequestSessionImpl.execute(DataRequestSessionImpl.java:620)
	at org.eclipse.birt.report.engine.data.dte.DteDataEngine.doExecuteQuery(DteDataEngine.java:152)
	at org.eclipse.birt.report.engine.data.dte.DataGenerationEngine.doExecuteQuery(DataGenerationEngine.java:80)
	at org.eclipse.birt.report.engine.data.dte.AbstractDataEngine.execute(AbstractDataEngine.java:267)
	at org.eclipse.birt.report.engine.executor.ExecutionContext.executeQuery(ExecutionContext.java:1905)
	at org.eclipse.birt.report.engine.executor.QueryItemExecutor.executeQuery(QueryItemExecutor.java:80)
	at org.eclipse.birt.report.engine.executor.TableItemExecutor.execute(TableItemExecutor.java:62)
	at org.eclipse.birt.report.engine.internal.executor.wrap.WrappedReportItemExecutor.execute(WrappedReportItemExecutor.java:46)
	at org.eclipse.birt.report.engine.internal.executor.emitter.ReportItemEmitterExecutor.execute(ReportItemEmitterExecutor.java:46)
	at org.eclipse.birt.report.engine.internal.executor.dup.SuppressDuplicateItemExecutor.execute(SuppressDuplicateItemExecutor.java:43)
	at org.eclipse.birt.report.engine.internal.executor.wrap.WrappedReportItemExecutor.execute(WrappedReportItemExecutor.java:46)
	at org.eclipse.birt.report.engine.internal.executor.l18n.LocalizedReportItemExecutor.execute(LocalizedReportItemExecutor.java:34)
	at org.eclipse.birt.report.engine.layout.html.HTMLBlockStackingLM.layoutNodes(HTMLBlockStackingLM.java:65)
	at org.eclipse.birt.report.engine.layout.html.HTMLStackingLM.layoutChildren(HTMLStackingLM.java:26)
	at org.eclipse.birt.report.engine.layout.html.HTMLAbstractLM.layout(HTMLAbstractLM.java:140)
	at org.eclipse.birt.report.engine.layout.html.HTMLInlineStackingLM.resumeLayout(HTMLInlineStackingLM.java:111)
	at org.eclipse.birt.report.engine.layout.html.HTMLInlineStackingLM.layoutNodes(HTMLInlineStackingLM.java:160)
	at org.eclipse.birt.report.engine.layout.html.HTMLStackingLM.layoutChildren(HTMLStackingLM.java:26)
	at org.eclipse.birt.report.engine.layout.html.HTMLAbstractLM.layout(HTMLAbstractLM.java:140)
	at org.eclipse.birt.report.engine.layout.html.HTMLBlockStackingLM.layoutNodes(HTMLBlockStackingLM.java:70)
	at org.eclipse.birt.report.engine.layout.html.HTMLStackingLM.layoutChildren(HTMLStackingLM.java:26)
	at org.eclipse.birt.report.engine.layout.html.HTMLTableLM.layoutChildren(HTMLTableLM.java:132)
	at org.eclipse.birt.report.engine.layout.html.HTMLAbstractLM.layout(HTMLAbstractLM.java:140)
	at org.eclipse.birt.report.engine.layout.html.HTMLBlockStackingLM.layoutNodes(HTMLBlockStackingLM.java:70)
	at org.eclipse.birt.report.engine.layout.html.HTMLPageLM.layout(HTMLPageLM.java:92)
	at org.eclipse.birt.report.engine.layout.html.HTMLReportLayoutEngine.layout(HTMLReportLayoutEngine.java:100)
	at org.eclipse.birt.report.engine.presentation.ReportDocumentBuilder.build(ReportDocumentBuilder.java:249)
	at org.eclipse.birt.report.engine.api.impl.RunTask.doRun(RunTask.java:260)
	at org.eclipse.birt.report.engine.api.impl.RunTask.run(RunTask.java:85)
	at org.eclipse.birt.report.service.ReportEngineService.runReport(ReportEngineService.java:1317)
	at org.eclipse.birt.report.service.BirtViewerReportService.runReport(BirtViewerReportService.java:158)
	at org.eclipse.birt.report.service.actionhandler.BirtRunReportActionHandler.__execute(BirtRunReportActionHandler.java:81)
	at org.eclipse.birt.report.service.actionhandler.BirtGetPageActionHandler.__checkDocumentExists(BirtGetPageActionHandler.java:58)
	at org.eclipse.birt.report.service.actionhandler.AbstractGetPageActionHandler.prepareParameters(AbstractGetPageActionHandler.java:119)
	at org.eclipse.birt.report.service.actionhandler.AbstractGetPageActionHandler.__execute(AbstractGetPageActionHandler.java:104)
	at org.eclipse.birt.report.service.actionhandler.AbstractBaseActionHandler.execute(AbstractBaseActionHandler.java:90)
	at org.eclipse.birt.report.soapengine.processor.AbstractBaseDocumentProcessor.__executeAction(AbstractBaseDocumentProcessor.java:47)
	at org.eclipse.birt.report.soapengine.processor.AbstractBaseComponentProcessor.executeAction(AbstractBaseComponentProcessor.java:143)
	at org.eclipse.birt.report.soapengine.processor.BirtDocumentProcessor.handleGetPage(BirtDocumentProcessor.java:87)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.eclipse.birt.report.soapengine.processor.AbstractBaseComponentProcessor.process(AbstractBaseComponentProcessor.java:112)
	at org.eclipse.birt.report.soapengine.endpoint.BirtSoapBindingImpl.getUpdatedObjects(BirtSoapBindingImpl.java:66)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.axis.providers.java.RPCProvider.invokeMethod(RPCProvider.java:397)
	at org.apache.axis.providers.java.RPCProvider.processMessage(RPCProvider.java:186)
	at org.apache.axis.providers.java.JavaProvider.invoke(JavaProvider.java:323)
	at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)
	at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)
	at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)
	at org.apache.axis.handlers.soap.SOAPService.invoke(SOAPService.java:454)
	at org.apache.axis.server.AxisServer.invoke(AxisServer.java:281)
	at org.apache.axis.transport.http.AxisServlet.doPost(AxisServlet.java:699)
	at org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.doPost(BirtSoapMessageDispatcherServlet.java:265)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.service(BirtSoapMessageDispatcherServlet.java:122)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.eclipse.birt.report.filter.ViewerFilter.doFilter(ViewerFilter.java:68)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
...

后来经过多次查询资料后，发现了一个另外的配置信息：

this.setExtensionProperty("odaURL", props.getProperty("url"));
this.setExtensionProperty("odaDriverClass", props.getProperty("driver"));
this.setExtensionProperty("odaUser", props.getProperty("userid"));
this.setExtensionProperty("odaPassword", props.getProperty("password"));

配置后，重新启动，无任何问题，报表生成成功。