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java.lang.NullPointerException: 	at test.personservice.dao.PersonDAO.getAllPersons(PersonDAO.java:21)	at test.personservice.data.Storage.initSampleData(Storage.java:94)	at test.personservice.data.Storage.(Storage.java:30)	at test.personservice.web.PersonServlet.service(PersonServlet.java:35)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:416)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:283)	at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)	at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)	at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)	at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)	at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)	at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)	at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)	at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)	at java.lang.Thread.run(Thread.java:745)