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jEdit jEdit editor, from http://jedit.org/, is currently one of our favorite Java and Ant text editors. Its AntFarm plug-in lists all the targets on a build file that you have added to it; selecting a target runs it. Status and error messages appear in the console window; clicking on an error will highlight the file containing an error in Java source or the build file itself.

The same query and code looks slightly different in Java Persistence:

Figure C.1 jEdit executing a build file with AntFarm; the build file is in the main window with some of the targets collapsed for easier navigation; the targets of the file are listed in the pane to the left. We have encountered an error on this run; the line on the build file where this happened is underlined and a ToolTip has popped up the message.

Query q = em.createQuery(queryString) .setParameter("search", searchString) .setParameter("minDate", mDate, TemporalType.DATE);

The setParameter() method is a generic operation that can bind all types of arguments, it only needs a little help for temporal types (the engine needs to know if you want only the date, time, or a full timestamp bound). Java Persistence supports only this method for binding of parameters (Hibernate, by the way, has it too). Hibernate, on the other hand, offers many other methods, some of them for completeness, others for convenience, that you can use to bind arguments to query parameters. Using Hibernate parameter binding You ve called setString() and setDate() to bind arguments to query parameters. The native Hibernate Query interface provides similar convenience methods for binding arguments of most of the Hibernate built-in types: everything from setInteger() to setTimestamp() and setLocale(). They re mostly optional; you can rely on the setParameter() method to figure out the right type automatically (except for temporal types). A particularly useful method is setEntity(), which lets you bind a persistent entity (note that setParameter() is smart enough to understand even that automatically):

To generate Ant files the tool comes with an excellent XML editor mode that autocompletes many tags and lets you expand and collapse targets for easier navigation. Figure C.1 shows the results of a build, with the build file displayed in Ant mode, which adds highlighting of many of the Ant keywords to the XML view. The jEdit editor does not attempt to rearrange the XML at all, letting you write a build file in a readable form. You do however have to write most of that build file yourself; apart from a few dialogs, which fill out the basic options for tasks such as <javac>.

session.createQuery("from Item item where item.seller = :seller") .setEntity("seller", theSeller);

The final nice feature of jEdit for Ant-based development is that although it ships with a built-in version of Ant, you can select any other installation of Ant on the command line through a dialog box, which is ideal when you are extending or editing Ant itself. Unfortunately, not all changes to Ant are handled so well; some changes to wellknown tasks, such as new <condition> tests, need a new version of the AntFarm plug-in, which can be inconvenient. Changes to attributes and the addition of new tasks do not cause this problem. Because of Ant version issues, we actually use some jEdit macros to run Ant targets via the command console, saving files before executing the build. With different macros calling different targets, for example, build, test, and deploy, and keystroke bindings for each target, we can do fast Ant-based development within the IDE without the AntFarm plug-in. The tool is a great text editor, and compared to the other Java tools it is positively svelte, showing that you can do fast GUI applications in Java if you try hard enough. It is therefore well worth installing and experimenting with, even if you choose to stick to other IDEs.

However, there is also a generic method that allows you to bind an argument of any Hibernate type:

Figure C.2 IntelliJ IDEA, running the same build file and displaying errors. The pane of Ant targets is on the right; these targets are also listed under the build menu for easy access by mouse or keyboard shortcut.

String queryString = "from Item item" + " where item.seller = :seller and" + " item.description like :desc"; session.createQuery(queryString) .setParameter( "seller", theSeller, Hibernate.entity(User.class) ) .setParameter( "desc", description, Hibernate.STRING );

This works even for custom user-defined types, like MonetaryAmount: