JasperReport 表单发布的问题

在MyEclipse中 导入jar包不对的时候会报 jasperreport引擎的异常，engine.JRException，提示的错误如下：

 2012-4-23 16:56:24 org.apache.catalina.core.ApplicationContext log

信息: Marking servlet LogServlet as unavailable

2012-4-23 16:56:24 org.apache.catalina.core.StandardWrapperValve invoke

严重: Allocate exception for servlet LogServlet

java.lang.ClassNotFoundException: net.sf.jasperreports.engine.JRException

at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1360)

at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1206)

at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)

at java.lang.Class.getDeclaredConstructors0(Native Method)

at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)

at java.lang.Class.getConstructor0(Class.java:2699)

at java.lang.Class.newInstance0(Class.java:326)

at java.lang.Class.newInstance(Class.java:308)

at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1104)

at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:806)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)

at java.lang.Thread.run(Thread.java:619)

 解决方法，按如下图导入相关的jar包，导入多了也出现异常，其中的 oscarJDBC.JAR是我自己的。