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java.lang.NullPointerException: 	at java.io.FileOutputStream.(FileOutputStream.java:172)	at java.io.FileOutputStream.(FileOutputStream.java:70)	at java.io.FileWriter.(FileWriter.java:46)	at org.apache.commons.configuration.BasePropertiesConfiguration.save(BasePropertiesConfiguration.java:251)	at org.apache.commons.configuration.PropertiesConfiguration.save(PropertiesConfiguration.java:141)	at createTxt.doGet(createTxt.java:32)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)	at org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:466)	at org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:180)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564)	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:564)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:195)	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:564)	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:564)	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:828)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:700)	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:584)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)	at java.lang.Thread.run(Thread.java:534)