Erro ao gerar relatorio Jasper

Front-end
#1

Pessoal, Boa Tarde.

Sou novo no forum e pesquisei meu problema e inicialmente nao encontrei nada que me ajudasse.

Sou novo também no JAVA.

Estou tentando gerar um relatorio com Jasper iReport + JAVA + NetBeans e na hora que vou fazer a geração do relatório, acusa um erro “java.lang.NullPointerException”

Eu não sei o que é isso.

Meu codigo:

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException, JRException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            Connection con = new Conexao().getConnection();
            HashMap parametros = new HashMap();
            ServletContext sc = getServletContext();
            String nomeArquivo = sc.getRealPath("/") + "report.html";
            JasperPrint jp = JasperFillManager.fillReport(sc.getRealPath("/jasper/report1.jasper"), parametros, con);            
            JasperExportManager.exportReportToHtmlFile(jp, nomeArquivo);
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet GerarHTML</title>");  
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet GerarHTML at " + request.getContextPath () + "</h1>");
            out.println("</body>");
            out.println("</html>");
           
        }catch (Exception e) 
           {
               e.printStackTrace();
           }
    }

Me ajudem por favor!
Desde já agradeço.

#2

post a stackTrace completa para vermos em que linha esta ocorrendo o erro.

#3

GRAVE: java.lang.NullPointerException at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:63) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:402) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:234) at Teste.VisualizaRelatorio.processRequest(VisualizaRelatorio.java:48) at Teste.VisualizaRelatorio.doGet(VisualizaRelatorio.java:80) at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97) at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185) at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57) at com.sun.grizzly.ContextTask.run(ContextTask.java:69) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309) at java.lang.Thread.run(Thread.java:662)

#4