java.io.FileNotFoundException问题，说是db.properties文件找不到，但是在webapps里存在的，着急啊，求解

java.io.FileNotFoundException: F:\Program%20Files\apache-tomcat-6.0.36\webapps\fpms2.0\WEB-INF\classes\db.properties (系统找不到指定的路径。)
at java.io.FileInputStream.open(Native Method
at java.io.FileInputStream.<init>(FileInputStream.java:106
at java.io.FileInputStream.<init>(FileInputStream.java:66
at com.huating.jfp.data.TimerWork$DatabaseProperties.<init>(TimerWork.java:224
at com.huating.jfp.data.TimerWork$DatabaseProperties.mustgetInstance(TimerWork.java:252
at com.huating.jfp.data.TimerWork$DatabaseProperties.getInstance(TimerWork.java:246)
at com.huating.jfp.data.TimerWork.init(TimerWork.java:50)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1206
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1026
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4421
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4734
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1079
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1002
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:506
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463
at org.apache.catalina.core.StandardService.start(StandardService.java:525
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754
at org.apache.catalina.startup.Catalina.start(Catalina.java:595
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.catalina.startup.Bootstrap.start(Bootstrap.java:289
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414
2012-11-26 11:55:28 org.apache.catalina.core.ApplicationContext log
严重: StandardWrapper.Throwable
java.lang.NullPointerException
at java.lang.Class.forName0(Native Method
at java.lang.Class.forName(Class.java:169
at com.huating.jfp.data.TimerWork.init(TimerWork.java:53
at javax.servlet.GenericServlet.init(GenericServlet.java:212
at

相关了解……