访问BIRT报表时出现Cannot load JDBC Driver错误！

访问BIRT报表时出现错误：

可能原因是ORACLE JDBC类没有找到，但是在项目里面已经包含了classes12的包。在JBoss的lib里面也包含classes12的包。

引用

14:09:49,685 INFO  [STDOUT] 2007-12-14 14:09:49 org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager findDriver
警告: Failed to load JDBC driver class: oracle.jdbc.OracleDriver
14:09:49,895 INFO  [STDOUT] 2007-12-14 14:09:49 org.eclipse.birt.data.engine.odaconsumer.ConnectionManager openConnection
严重: Cannot open connection.
org.eclipse.birt.report.data.oda.jdbc.JDBCException: Cannot load JDBC Driver class: oracle.jdbc.OracleDriver
at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.findDriver(JDBCDriverManager.java:623)
at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.loadAndRegisterDriver(JDBCDriverManager.java:731)
at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.doConnect(JDBCDriverManager.java:192)
at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.getConnection(JDBCDriverManager.java:158)
at org.eclipse.birt.report.data.oda.jdbc.Connection.connectByUrl(Connection.java:158)
at org.eclipse.birt.report.data.oda.jdbc.Connection.open(Connection.java:115)
at org.eclipse.datatools.connectivity.oda.consumer.helper.OdaConnection.open(OdaConnection.java:235)
at org.eclipse.birt.data.engine.odaconsumer.ConnectionManager.openConnection(ConnectionManager.java:145)
at org.eclipse.birt.data.engine.executor.DataSource.newConnection(DataSource.java:134)
at org.eclipse.birt.data.engine.executor.DataSource.open(DataSource.java:121)
at org.eclipse.birt.data.engine.impl.DataSourceRuntime.openOdiDataSource(DataSourceRuntime.java:214)
at org.eclipse.birt.data.engine.impl.QueryExecutor.openDataSource(QueryExecutor.java:265)
at org.eclipse.birt.data.engine.impl.QueryExecutor.prepareExecution(QueryExecutor.java:210)
at org.eclipse.birt.data.engine.impl.PreparedQuery.doPrepare(PreparedQuery.java:500)
at org.eclipse.birt.data.engine.impl.PreparedDataSourceQuery.execute(PreparedDataSourceQuery.java:161)
at org.eclipse.birt.data.engine.impl.PreparedOdaDSQuery.execute(PreparedOdaDSQuery.java:142)
at org.eclipse.birt.data.engine.impl.PreparedDataSourceQuery.execute(PreparedDataSourceQuery.java:141)
at org.eclipse.birt.report.engine.api.impl.GetParameterDefinitionTask.createDynamicSelectionChoices(GetParameterDefinitionTask.java:490)
at org.eclipse.birt.report.engine.api.impl.GetParameterDefinitionTask.getChoicesFromParameterQuery(GetParameterDefinitionTask.java:940)
at org.eclipse.birt.report.engine.api.impl.GetParameterDefinitionTask.getSelectionList(GetParameterDefinitionTask.java:358)
at org.eclipse.birt.report.engine.api.impl.GetParameterDefinitionTask.getSelectionListForCascadingGroup(GetParameterDefinitionTask.java:720)
at org.eclipse.birt.report.service.BirtViewerReportService.getSelectionListForCascadingGroup(Unknown Source)
at org.eclipse.birt.report.presentation.aggregation.parameter.ComboBoxParameterFragment.getParameterSelectionListForCascadingGroup(Unknown Source)
at org.eclipse.birt.report.presentation.aggregation.parameter.ComboBoxParameterFragment.prepareParameterBean(Unknown Source)
at org.eclipse.birt.report.presentation.aggregation.parameter.ScalarParameterFragment.doService(Unknown Source)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment.service(Unknown Source)
at org.apache.jsp.webcontent.birt.pages.parameter.ParameterGroupFragment_jsp._jspService(org.apache.jsp.webcontent.birt.pages.parameter.ParameterGroupFragment_jsp:133)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment.service(Unknown Source)
at org.apache.jsp.webcontent.birt.pages.dialog.ParameterDialogFragment_jsp._jspService(org.apache.jsp.webcontent.birt.pages.dialog.ParameterDialogFragment_jsp:99)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment.service(Unknown Source)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment.callBack(Unknown Source)
at org.apache.jsp.webcontent.birt.pages.dialog.DialogContainerFragment_jsp._jspService(org.apache.jsp.webcontent.birt.pages.dialog.DialogContainerFragment_jsp:126)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment.service(Unknown Source)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment.callBack(Unknown Source)
at org.apache.jsp.webcontent.birt.pages.layout.SidebarFragment_jsp._jspService(org.apache.jsp.webcontent.birt.pages.layout.SidebarFragment_jsp:62)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment.service(Unknown Source)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment.callBack(Unknown Source)
at org.apache.jsp.webcontent.birt.pages.layout.ReportFragment_jsp._jspService(org.apache.jsp.webcontent.birt.pages.layout.ReportFragment_jsp:62)
at org.apache.jasper.r
14:09:49,915 INFO  [STDOUT] untime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment.service(Unknown Source)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment.callBack(Unknown Source)
at org.apache.jsp.webcontent.birt.pages.layout.FramesetFragment_jsp._jspService(org.apache.jsp.webcontent.birt.pages.layout.FramesetFragment_jsp:254)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at org.eclipse.birt.report.presentation.aggregation.layout.FramesetFragment.service(Unknown Source)
at org.eclipse.birt.report.servlet.ViewerServlet.__doGet(Unknown Source)
at org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.doGet(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.eclipse.birt.report.filter.ViewerFilter.doFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
at java.lang.Thread.run(Unknown Source)

问题解决：
把classes12.jar包拷贝到birt.war\WEB-INF\platform\plugins\org.eclipse.birt.report.data.oda.jdbc_2.2.1.r22x_v20070919\drivers目录下就可以了。