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public Object assemble(Serializable cached, Object owner) { return cached; }

This is a valid approach for configuration options that are definitely per-system, such as the URL of a database server, but for many options, such as these Cactus servlets, it is the wrong approach. It gets overly complicated when more than one server needs to have the same servlets included: you need to copy the same XML fragments into separate conditional statements. Instead, you should tease out each attribute into its own property (cactus.enabled, log4j.enabled, jndi.enabled), then have a configuration for each system that enables or disables these properties as appropriate. A property file for each server would be the ideal place to keep this configuration data; Ant could load the appropriate file for a server before creating the deployment descriptor.

public Object replace(Object original, Object target,

Customizing libraries in the WAR file Altering the web.xml deployment descriptor lets you target different systems as destinations for your web application, but it is not enough. Different application servers have different built-in libraries; web applications need to avoid creating conflicts with these built-in libraries by omitting duplicate or incompatible versions. The XML parser is the classic problem, but a simpler one is whether to include packages such as the JavaMail API in mail.jar packages, which all J2EE servers include. WAR files built for a pure web server such as Tomcat need to include those libraries. Versions built for a full J2EE server should omit them. We could generate the different WAR files with different declarations of the WAR task, each including different libraries. Alternatively, we can write a reusable target that takes a path or a reference to fileset, listing all the libraries to include, and invoke it with <antcall>. Even better, we can take advantage of the if/unless attributes on patternsets to allow for conditional inclusion or exclusion of files. We will postpone this work until we get to deployment in chapter 18, and actually have to start worrying about supporting different target systems.

Object owner) { return original; } public boolean equals(Object x, Object y) { if (x == y) return true; if (x == null || y == null) return false; return x.equals(y); } public int hashCode(Object x) { return x.hashCode(); } public Object nullSafeGet(ResultSet resultSet, String[] names, Object owner) throws SQLException {

Static content often goes alongside dynamic content generated by JSP pages and servlets. In a large system, developers often offload this content to front-end servers running something like the Apache web server, reducing the load on the application server systems that need the CPU cycles for the dynamic content. Ant can help with static content in two ways. First, it can create static content or customize existing content. Second, it can deploy the content.

BigDecimal valueInUSD = resultSet.getBigDecimal(names[0]); // Deferred check after first read if (resultSet.wasNull()) return null; Currency userCurrency = User.getPreferences().getCurrency(); MonetaryAmount amount = new MonetaryAmount(valueInUSD, "USD"); return amount.convertTo(userCurrency); } public void nullSafeSet(PreparedStatement statement, Object value, int index) throws HibernateException, SQLException { if (value == null) { statement.setNull(index, Hibernate.BIG_DECIMAL.sqlType()); } else { MonetaryAmount anyCurrency = (MonetaryAmount)value; MonetaryAmount amountInUSD = MonetaryAmount.convert( anyCurrency, Currency.getInstance("USD") ); statement.setBigDecimal(index, amountInUSD.getAmount ()); } } }

The sqlTypes() method tells Hibernate what SQL column types to use for DDL schema generation. Notice that this method returns an array of type codes. A UserType may map a single property to multiple columns, but this legacy data model has only a single numeric column. By using the Hibernate.BIG_DECIMAL.sqlType() method, you let Hibernate decide the exact SQL

Generating new content Ant can generate any content that you can create from Ant tasks, or by running Java or native programs during the build. As a complex example, to create custom artwork, you could somehow generate some SVG, the XML-based image description language, then render it to an image with Batik, the SVG-rendering tool from Apache s XML project. Ant could invoke the renderer and include the generated images into a WAR file. A simpler example is to include the javadoc-generated API documentation in the web application. We do this by running our usual javadocs target before we create the WAR file, and including its output in the archive. First, we configure the javadocs target to leave out the author tags and any private methods and member variables, as we do not want those details included in the public documentation: