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try { Context ctx = new InitialContext(); if (ctx == null) throw new ForumException( "There was a problem connecting to the database", "Null Context retrieved", new NullPointerException()); DataSource ds = (DataSource) ctx.lookup(DATABASE_CONTEXT); if (ds == null) throw new ForumException( "There was a problem connecting to the database", "Null data source retrieved", new NullPointerException()); return ds.getConnection(); } catch (NamingException e) { throw new ForumException( "There was a problem connecting to the database", "Naming lookup failed", e); } catch (SQLException e) { throw new ForumException( "There was a problem connecting to the database", "SQL failed", e); } } // This declares the name that will be used to obtain a datasource // from the Application Server. public static final String DATABASE_CONTEXT = "java:comp/env/jdbc/forum";

The Image module has basic taxonomy-based image galleries. You configure galleries by selecting administer image galleries (admin/image). The form for adding galleries (admin/ image/add) looks similar to the form for adding category terms, and with good reason. The Image module creates a vocabulary of categories to manage your galleries (see 2 for more on categories). You can build galleries hierarchically by assigning a parent in the Parent field and order them with the Weight field, just as with categories.

With these two quite trivial changes, the application no longer requires an explicit database configuration in the properties file. The context names for DataSources and other resources should be provided with the administrator documentation for your applications so that users deploying an application can configure it appropriately to connect to their database.

Note The gallery functions are dependent on the Taxonomy module. Make sure the Taxonomy module is

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JasperReports is a powerful, open source reporting tool that allows you to create rich reports in the form of HTML, XLS, PDF, and so on. Spring provides convenient support for using JasperReports to add report-generating capabilities to your web application. As with the PDF and Excel support described in the previous sections, Spring provides view implementations for JasperReports views, as listed in Table 9-3. Table 9-3. The JasperReports View Classes Provided by Spring

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After you have configured the galleries, you can take a peek at what is going on behind the scenes by visiting the list of vocabularies: administer categories (admin/taxonomy). You will see the gallery structure you created is really a vocabulary managed by the Taxonomy module.

Converting our application was not an entirely straightforward process. We encountered a few problems with some of the technology that we chose to use in our solution. There is a minor bug in Tomcat 5.0.19 that produces a NullPointerException under some circumstances if there is no local session object. Unfortunately, Pluto exercises this particular bug if you re using this particular combination, you will need to upgrade to version 5.0.25 or higher of Tomcat. Pluto does not handle parameters quite as expected. Parameters containing a question mark will not be encoded when constructing the URL to invoke the portlet. Since is used in HTTP as the delimiter between the file path part of a URL and the query part, everything subsequent to the question mark is lost from the parameter list of the receiving portlet. The specification does not address the character in URLs explicitly, but would permit encoding of it, so we consider this to be a bug (or at least a quirk) in the current Pluto implementation. We hope that by the time you read this you won t have to jump through quite so many hoops to construct usable URLs.

When you are ready to upload images to your site, select content image (node/add/image). The process for uploading images is straightforward, and the module will automatically make thumbnails and various derivative sizes on the server. Since images are nodes, you make the same decisions about whether they should be promoted to the front page as with any other node type. In addition, you have the option of viewing your images in the context of the galleries you specified. If you have the Menu module activated, you can go to admin/menu and activate the navigation link for the galleries. Otherwise, you can add it to your primary or secondary links with the path image. (The Drupal path to your image galleries is image.)

JasperReportsCsvView JasperReportsHtmlView JasperReportsPdfView JasperReportsXlsView JasperReportsMultiFormatView

Summary

on from the block administration page (admin/blocks).

In this chapter, we looked at converting an existing application into a portlet. We discussed how to adapt the JSP files to behave as a single portlet, we discussed the configuration of the database connection, and we looked at the creation of tag libraries to interact with the portlet-specific behavior. In the next chapter, we look at presenting summary information such as charts and reports within a portlet.

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