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POPrimeFaces and JasperReports
 

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    <p>i'm trying to develop a web app for reporting, and have built a site with EJB3 + primefaces already. Now i'm head aching how to integrate Jasperreport into primefaces... I found no guide or discussion about this topic, I wonder is it not possible? or actually it is not a right way to do? I'm actually quite new to develop JavaEE6, dont plan to use frameworks like spring and seam yet. </p> <hr> <p><strong>model</strong></p> <pre><code>@Stateless @LocalBean public class BookEJB { // @Override public void printReport() throws ClassNotFoundException, IOException, JRException, SQLException { Connection connection; Map parameterMap = new HashMap(); FacesContext ctx = FacesContext.getCurrentInstance(); HttpServletResponse response = (HttpServletResponse) ctx .getExternalContext().getResponse(); InputStream reportStream = ctx.getExternalContext() .getResourceAsStream("reports/report1.jasper"); ServletOutputStream servletOutputStream = response.getOutputStream(); Class.forName("com.mysql.jdbc.Driver"); connection = DriverManager.getConnection("jdbc:mysql://localhost/bookdb?user=root&amp;password=******"); ctx.responseComplete(); response.setContentType("application/pdf"); JasperRunManager.runReportToPdfStream(reportStream, servletOutputStream, parameterMap, connection); connection.close(); servletOutputStream.flush(); servletOutputStream.close(); } } </code></pre> <hr> <p><strong>Controller</strong></p> <pre><code>@ManagedBean(name = "bookCtrl") @RequestScoped public class BookController { @EJB private BookEJB bookEJB; public void doPrintReport() throws ClassNotFoundException, IOException, JRException, SQLException { bookEJB.printReport(); } } </code></pre> <hr> <p><strong>view (JSF)</strong></p> <pre><code>&lt;body&gt; &lt;f:view&gt; &lt;h:outputText value="Click on the link below to generate the report." /&gt; &lt;h:form&gt; &lt;h:commandButton action="#{bookCtrl.doPrintReport}" value="Generate Report" /&gt; &lt;/h:form&gt; &lt;/f:view&gt; &lt;/body&gt; </code></pre> <hr> <p><strong>Jasper</strong></p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!-- Created with Jaspersoft Studio --&gt; &lt;jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="report1" language="groovy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20"&gt; &lt;property name="ireport.zoom" value="1.0"/&gt; &lt;property name="ireport.x" value="0"/&gt; &lt;property name="ireport.y" value="0"/&gt; &lt;queryString language="SQL"&gt; &lt;![CDATA[SELECT * FROM `book` book]]&gt; &lt;/queryString&gt; &lt;field name="Id" class="java.lang.Integer"/&gt; &lt;field name="title" class="java.lang.String"/&gt; &lt;field name="price" class="java.lang.String"/&gt; &lt;background&gt; &lt;band splitType="Stretch"/&gt; &lt;/background&gt; &lt;title&gt; &lt;band height="45" splitType="Stretch"/&gt; &lt;/title&gt; &lt;pageHeader&gt; &lt;band height="35" splitType="Stretch"/&gt; &lt;/pageHeader&gt; &lt;columnHeader&gt; &lt;band height="21" splitType="Stretch"&gt; &lt;staticText&gt; &lt;reportElement x="0" y="0" width="100" height="20"/&gt; &lt;textElement/&gt; &lt;text&gt;&lt;![CDATA[Id]]&gt;&lt;/text&gt; &lt;/staticText&gt; &lt;staticText&gt; &lt;reportElement x="100" y="0" width="100" height="20"/&gt; &lt;textElement/&gt; &lt;text&gt;&lt;![CDATA[title]]&gt;&lt;/text&gt; &lt;/staticText&gt; &lt;staticText&gt; &lt;reportElement x="200" y="0" width="100" height="20"/&gt; &lt;textElement/&gt; &lt;text&gt;&lt;![CDATA[price]]&gt;&lt;/text&gt; &lt;/staticText&gt; &lt;/band&gt; &lt;/columnHeader&gt; &lt;detail&gt; &lt;band height="24" splitType="Stretch"&gt; &lt;textField&gt; &lt;reportElement x="0" y="0" width="100" height="20"/&gt; &lt;textElement/&gt; &lt;textFieldExpression class="java.lang.Integer"&gt;&lt;![CDATA[$F{Id}]]&gt;&lt;/textFieldExpression&gt; &lt;/textField&gt; &lt;textField&gt; &lt;reportElement x="100" y="0" width="100" height="20"/&gt; &lt;textElement/&gt; &lt;textFieldExpression class="java.lang.String"&gt;&lt;![CDATA[$F{title}]]&gt;&lt;/textFieldExpression&gt; &lt;/textField&gt; &lt;textField&gt; &lt;reportElement x="200" y="0" width="100" height="20"/&gt; &lt;textElement/&gt; &lt;textFieldExpression class="java.lang.String"&gt;&lt;![CDATA[$F{price}]]&gt;&lt;/textFieldExpression&gt; &lt;/textField&gt; &lt;/band&gt; &lt;/detail&gt; &lt;columnFooter&gt; &lt;band height="45" splitType="Stretch"/&gt; &lt;/columnFooter&gt; &lt;pageFooter&gt; &lt;band height="54" splitType="Stretch"/&gt; &lt;/pageFooter&gt; &lt;summary&gt; &lt;band height="42" splitType="Stretch"/&gt; &lt;/summary&gt; &lt;/jasperReport&gt; </code></pre> <hr> <p>The error occurred when I click the button of JSF, below log is from glassfish</p> <pre><code>WARNING: A system exception occurred during an invocation on EJB BookEJB method public void blah.BookEJB.printReport() throws java.lang.ClassNotFoundException,java.io.IOException,net.sf.jasperreports.engine.JRException,java.sql.SQLException javax.ejb.EJBException..... SEVERE: javax.ejb.EJBException javax.faces.el.EvaluationException: javax.ejb.EJBException at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102) WARNING: #{bookCtrl.doPrintReport}: javax.ejb.EJBException javax.faces.FacesException: #{bookCtrl.doPrintReport}: javax.ejb.EJBException... Caused by: javax.faces.el.EvaluationException: javax.ejb.EJBException... SEVERE: javax.faces.FacesException: #{bookCtrl.doPrintReport}: javax.ejb.EJBException... Caused by: javax.faces.FacesException: #{bookCtrl.doPrintReport}: javax.ejb.EJBException... Caused by: javax.faces.el.EvaluationException: javax.ejb.EJBException... Caused by: javax.ejb.EJBException... Caused by: java.lang.NullPointerException... WARNING: StandardWrapperValve[Faces Servlet]: PWC1406: Servlet.service() for servlet Faces Servlet threw exception java.lang.IllegalStateException: PWC3991: getOutputStream() has already been called for this response..... WARNING: StandardWrapperValve[Faces Servlet]: PWC1406: Servlet.service() for servlet Faces Servlet threw exception java.lang.IllegalStateException: PWC3991: getOutputStream() has already been called for this response..... WARNING: StandardWrapperValve[Faces Servlet]: PWC1406: Servlet.service() for servlet Faces Servlet threw exception java.lang.IllegalStateException: PWC3991: getOutputStream() has already been called for this response..... </code></pre>
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    1. COhow to solve the "java.lang.IllegalStateException: PWC3991: getOutputStream() has already been called for this response" issue? i suppose it is glassfish problem rather than Jasper and Primefaces now...
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