我正在使用birt和eclipse设计报告。当我在tomcat中部署时，我遇到了这个问题。
Jun 6, 2011 10:42:39 AM org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager
loadDriverExtensions
INFO: Found JDBC driverinfo extension: driverClass=org.apache.derby.jdbc.Embedde
dDriver, connectionFactory=null
Jun 6, 2011 10:43:04 AM org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager
loadDriverExtensions
INFO: Found JDBC driverinfo extension: driverClass=org.eclipse.birt.report.data.
oda.sampledb.Driver, connectionFactory=org.eclipse.birt.report.data.oda.sampledb
.SampleDBJDBCConnectionFactory
Jun 6, 2011 10:43:04 AM org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager$
DriverClassLoader addNewURL
INFO: JDBCDriverManager: found JAR file drivers/ojdbc14.jar. URL=bundleentry://4
1.fwk12171472/drivers/ojdbc14.jar
Cannot create JDBC driver of class '' for connect URL 'null'
java.lang.NullPointerException
at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:507)
at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:476)
at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307)
at java.sql.DriverManager.getDriver(DriverManager.java:253)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(B
asicDataSource.java:1437)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDat
aSource.java:1371)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSo
urce.java:1044)
at org.eclipse.birt.report.data.oda.jdbc.JndiDataSource.getDataSourceCon
nection(JndiDataSource.java:178)
at org.eclipse.birt.report.data.oda.jdbc.JndiDataSource.getConnection(Jn
diDataSource.java:133)
at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.getJndiDSConn
ection(JDBCDriverManager.java:325)
at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.doConnect(JDB
CDriverManager.java:225)
at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.getConnection
(JDBCDriverManager.java:212)
at org.eclipse.birt.report.data.oda.jdbc.Connection.connectByUrl(Connect
ion.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.openConnec
tion(ConnectionManager.java:165)
at org.eclipse.birt.data.engine.executor.DataSource.newConnection(DataSo
urce.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:208)
at org.eclipse.birt.data.engine.impl.QueryExecutor.openDataSource(QueryE
xecutor.java:406)
at org.eclipse.birt.data.engine.impl.QueryExecutor.prepareExecution(Quer
yExecutor.java:316)
at org.eclipse.birt.data.engine.impl.PreparedQuery.doPrepare(PreparedQue
ry.java:455)
at org.eclipse.birt.data.engine.impl.PreparedDataSourceQuery.produceQuer
yResults(PreparedDataSourceQuery.java:190)
at org.eclipse.birt.data.engine.impl.PreparedDataSourceQuery.execute(Pre
paredDataSourceQuery.java:178)
at org.eclipse.birt.data.engine.impl.PreparedOdaDSQuery.execute(Prepared
OdaDSQuery.java:145)
at org.eclipse.birt.report.data.adapter.impl.DataRequestSessionImpl.exec
ute(DataRequestSessionImpl.java:616)
at org.eclipse.birt.report.engine.api.impl.GetParameterDefinitionTask.ex
ecuteQuery(GetParameterDefinitionTask.java:640)
at org.eclipse.birt.report.engine.api.impl.GetParameterDefinitionTask.ge
tResultSetForParameter(GetParameterDefinitionTask.java:1369)
at org.eclipse.birt.report.engine.api.impl.GetParameterDefinitionTask.ge
tChoicesFromParameterQuery(GetParameterDefinitionTask.java:1341)
at org.eclipse.birt.report.engine.api.impl.GetParameterDefinitionTask.do
GetSelectionList(GetParameterDefinitionTask.java:515)
at org.eclipse.birt.report.engine.api.impl.GetParameterDefinitionTask.ge
tSelectionList(GetParameterDefinitionTask.java:445)
at org.eclipse.birt.report.service.BirtViewerReportService.getParameterS
electionList(BirtViewerReportService.java:821)
at org.eclipse.birt.report.presentation.aggregation.parameter.ComboBoxPa
............................
org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:16
65)
at java.lang.Thread.run(Thread.java:619)
Cannot create JDBC driver of class '' for connect URL 'null'
java.lang.NullPointerException
at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:507)
at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:476)
at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307)
at java.sql.DriverManager.getDriver(DriverManager.java:253)
at .................
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationD
ispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDis
patcher.java:488)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment
.service(AbstractBaseFragment.java:82)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment
.callBack(AbstractBaseFragment.java:106)
at org.apache.jsp.webcontent.birt.pages.layout.SidebarFragment_jsp._jspS
ervice(SidebarFragment_jsp.java:72)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:386)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
13)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDisp
atcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationD
ispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDis
patcher.java:488)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment
.service(AbstractBaseFragment.java:82)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment
.callBack(AbstractBaseFragment.java:106)
at org.apache.jsp.webcontent.birt.pages.layout.ReportFragment_jsp._jspSe
rvice(ReportFragment_jsp.java:72)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:386)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
13)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDisp
atcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationD
ispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDis
patcher.java:488)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment
.service(AbstractBaseFragment.java:82)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment
.callBack(AbstractBaseFragment.java:106)
at org.apache.jsp.webcontent.birt.pages.layout.FramesetFragment_jsp._jsp
Service(FramesetFragment_jsp.java:265)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:386)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
13)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at ...................
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:16
65)
at java.lang.Thread.run(Thread.java:619)
Cannot create JDBC driver of class '' for connect URL 'null'
java.lang.NullPointerException
at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:507)
at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:476)
at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307)
at java.sql.DriverManager.getDriver(DriverManager.java:253)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(B
asicDataSource.java:1437)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDat
aSource.java:1371)
at .............. org.eclipse.birt.report.engine.api.impl.GetParameterDefinitionTask.do
GetSelectionList(GetParameterDefinitionTask.java:515)
at org.eclipse.birt.report.engine.api.impl.GetParameterDefinitionTask.ge
tSelectionList(GetParameterDefinitionTask.java:445)
at org.eclipse.birt.report.service.BirtViewerReportService.getParameterS
electionList(BirtViewerReportService.java:821)
at org.eclipse.birt.report.presentation.aggregation.parameter.ComboBoxPa
rameterFragment.prepareParameterBean(ComboBoxParameterFragment.java:91)
at org.eclipse.birt.report.presentation.aggregation.parameter.ScalarPara
meterFragment.doService(ScalarParameterFragment.java:91)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment
.service(AbstractBaseFragment.java:76)
at org.apache.jsp.webcontent.birt.pages.dialog.ParameterDialogFragment_j
sp._jspService(ParameterDialogFragment_jsp.java:109)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:386)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
13)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDisp
atcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationD
ispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDis
patcher.java:488)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment
.service(AbstractBaseFragment.java:82)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment
.callBack(AbstractBaseFragment.java:106)
at org.apache.jsp.webcontent.birt.pages.dialog.DialogContainerFragment_j
sp._jspService(DialogContainerFragment_jsp.java:135)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:386)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
13)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDisp
atcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationD
ispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDis
patcher.java:488)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment
.service(AbstractBaseFragment.java:82)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment
.callBack(AbstractBaseFragment.java:106)
at org.apache.jsp.webcontent.birt.pages.layout.SidebarFragment_jsp._jspS
ervice(SidebarFragment_jsp.java:72)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:386)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
13)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
...........................
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:16
65)
at java.lang.Thread.run(Thread.java:619)
Cannot create JDBC driver of class '' for connect URL 'null'
java.lang.NullPointerException
at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:507)
at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:476)
at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307)
at java.sql.DriverManager.getDriver(DriverManager.java:253)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(B
asicDataSource.java:1437)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDat
aSource.java:1371)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSo
urce.java:1044)
at org.eclipse.birt.report.data.oda.jdbc.JndiDataSource.getDataSourceCon
nection(JndiDataSource.java:178)
at org.eclipse.birt.report.data.oda.jdbc.JndiDataSource.getConnection(Jn
diDataSource.java:133)
at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.getJndiDSConn
ection(JDBCDriverManager.java:325)
at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.doConnect(JDB
CDriverManager.java:225)
at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.getConnection
(JDBCDriverManager.java:212)
at org.eclipse.birt.report.data.oda.jdbc.Connection.connectByUrl(Connect
ion.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.openConnec
tion(ConnectionManager.java:165)
at org.eclipse.birt.data.engine.executor.DataSource.newConnection(DataSo
urce.java:224)
at org.eclipse.birt.data.engine.executor.DataSource.open(DataSource.java
:212)
..........Some text
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationD
ispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDis
patcher.java:488)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment
.service(AbstractBaseFragment.java:82)
at org.eclipse.birt.report.presentation.aggregation.AbstractBaseFragment
.callBack(AbstractBaseFragment.java:106)
at org.apache.jsp.webcontent.birt.pages.dialog.DialogContainerFragment_j
sp._jspService(DialogContainerFragment_jsp.java:135)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:386)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
13)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDisp
atcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationD
ispatcher.j
我配置了web.xml和context.xml文件，并将ojdbc14.jar文件复制到webapps \ birt \ WEB-INF \ platform \ plugins \ org.eclipse.birt.report.data.oda.jdbc_2.6.2.r262_v20110127 \ drivers文件夹。
通过浏览器运行报告后，我遇到了这个问题。最初它显示进度条。但过了一段时间（30分钟），它显示空白报告。
我的查询可能需要1Hr时间才能执行。但报告显示在30分钟内空白。有什么问题。
请帮助我，这很紧急。 提前致谢， SRIKANTH
答案 0 :(得分：1)
这听起来可能与某种会话超时有关。我相信Tomcat的默认会话超时设置为30分钟。我相信这个设置在web.xml文件中。