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java.lang.NullPointerException: 	at com.mycompany.searching.BrowseProducts.browseProducts(BrowseProducts.java:150)	at com.mycompany.web.servlets.BrowseProductsServlet.doGet(BrowseProductsServlet.java:36)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:397)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:278)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:240)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:179)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:182)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)	at com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:137)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:231)	at com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)	at com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)	at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)	at com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)	at com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)	at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)	at com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)