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POHow to use jasperreports subreports with grails jasper plugin?
 

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  1. POHow to use jasperreports subreports with grails jasper plugin?
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    <p>I would like to use subreports with grails jasper plugins, I followed the manual at this url (<a href="http://www.grails.org/plugin/jasper" rel="nofollow noreferrer">http://www.grails.org/plugin/jasper</a>). Here is my code :</p> <p><strong>Domain Book :</strong> </p> <pre><code>class Book { static belongsTo = Library Library library String title String author String publisher String category static constraints={ title() author() publisher() category() } } </code></pre> <p><strong>Domain Library :</strong></p> <pre><code>class Library { static hasMany = [ books : Book ] String name String adresse Date dateMaturity static constraints = { } String toString() { return name } } </code></pre> <p><strong>In my BookController, I have :</strong> </p> <pre><code>def createReport = { def books = Book.list() chain(controller:'jasper',action:'index',model:[data:books],params:params) } </code></pre> <p><strong>In my LibraryController, I have :</strong></p> <pre><code>def createReport = { def library = Library.list() chain(controller:'jasper',action:'index',model:[data:library],params:params) } </code></pre> <p><strong>My jasper part is :</strong></p> <p>I have a SubReport file : books.jasper (get a list of books).<br> Also a MasterReport : library.jasper (get a list of library).</p> <p>In my MasterReport(library), I added subreport, I would like, for each library, show list of books it contains ; here is my library code :</p> <pre><code>&lt;parameter name="SUBREPORT_DIR" class="java.lang.String" isForPrompting="false"&gt; ... &lt;field name="books" class="java.util.Collection"/&gt; ... &lt;subreport isUsingCache="true"&gt; &lt;reportElement x="0" y="25" width="437" height="100"/&gt; &lt;dataSourceExpression&gt;&lt;![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{books})]]&gt;&lt;/dataSourceExpression&gt; &lt;subreportExpression class="java.lang.String"&gt;&lt;![CDATA[$P{SUBREPORT_DIR} + "books.jasper"]]&gt; &lt;/subreportExpression&gt; &lt;/subreport&gt; </code></pre> <p>And I have this error :</p> <p><strong>Error 500:</strong> Executing action [index] of controller [JasperController] in plugin [jasper] caused exception: net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression : Source text : new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{books})<br> <strong>Exception Message:</strong> failed to lazily initialize a collection of role: bookshelf.Library.books, no session or session was closed </p> <p>Thank you for help.</p>
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    1. USFabien Barbier
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