We build an exe which will have tomcat, jdk and our code in it. When we
install that in some system it installs perfectly but while accessing the
service it throws servlet instantiation error. This also happens for the
first time. If we restart that system everything works well. What may be the
issue?

2008-09-24 14:42:52 StandardContext[]Marking servlet CMLogin as unavailable
2008-09-24 14:42:53 StandardWrapperValve[CMLogin]: Allocate exception for
servlet CMLogin
javax.servlet.ServletException: Error instantiating servlet class
cmservelt.CMLoginServlet
        at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1011)
        at
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:712)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:187)
        at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199)
        at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184)
        at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
        at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
        at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
        at 
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
        at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732)
        at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688)
        at java.lang.Thread.run(Thread.java:534)
----- Root Cause -----
java.lang.ExceptionInInitializerError
        at cmservelt.CMLoginServlet.<clinit>(CMLoginServlet.java:42)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
        at java.lang.Class.newInstance0(Class.java:308)
        at java.lang.Class.newInstance(Class.java:261)
        at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1002)
        at
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:712)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:187)
        at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199)
        at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184)
        at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
        at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
        at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
        at 
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
        at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732)
        at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688)
        at java.lang.Thread.run(Thread.java:534)
Caused by: java.lang.NullPointerException
        at java.io.FileInputStream.<init>(FileInputStream.java:103)
        at java.io.FileInputStream.<init>(FileInputStream.java:66)
        at java.io.FileReader.<init>(FileReader.java:41)
        at data.UserFile.ReadFile(UserFile.java:76)
        at model.UserCollection.<clinit>(UserCollection.java:17)
        ... 31 more


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