exception
org.apache.jasper.JasperException: java.lang.NullPointerException org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335) javax.servlet.http.HttpServlet.service(HttpServlet.java:725) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.NullPointerException controlo.VendaC.insereVn(VendaC.java:429) controlo.ObjHTML.salvaVenda(ObjHTML.java:521) org.apache.jsp.vendSalva_jsp._jspService(vendSalva_jsp.java:84) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:725) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335) javax.servlet.http.HttpServlet.service(HttpServlet.java:725) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.12 logs.

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public boolean incluiRequerente(Requerente requerente) {try {con = acessoBD.conectar();ps = con.prepareStatement(incluiRequerente);//nome, id_nacionalidade, est_civil, profissao, rg, orgao, cpf, id_ruaav, numero, id_bairro, id_cidadeps.setString(1, requerente.getNome());ps.setString(2, requerente.getNacionalidade());ps.setString(3, requerente.getEstadoCivil());ps.setString(4, requerente.getProfissao());ps.setString(5, requerente.getRg());ps.setString(6, requerente.getOrgao());ps.setString(7, requerente.getCpf());ps.setInt(8, requerente.getLogradouro().getId());ps.setString(9, requerente.getNumero());ps.setInt(10, requerente.getBairro().getId());ps.setInt(11, requerente.getCidade().getId());ps.setString(12, requerente.getTelFixo());ps.setString(13, requerente.getTelCel());ps.setString(14, requerente.getNubente());ps.setString(15, requerente.getRegime());ps.setString(16, requerente.getRepresentado());ps.setString(17, requerente.getRepresentadoNome());ps.setString(18, requerente.getRepresentadoTipo());ps.setString(19, requerente.getTipoPessoa());if(requerente.getRequerente() == null){ps.setNull(20, 1);}elseps.setInt(20, requerente.getRequerente().getId());ps.executeUpdate();acessoBD.desconectar();return true;} catch (Exception e) {e.printStackTrace();}return false;}