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Many more issues must be considered when you introduce nontransactional data access in your application. We ve already noted that introducing a new type of transaction, namely read-only transactions, can significantly complicate any future modification of your application. The same is true if you introduce nontransactional operations. You would then have three different kinds of data access in your application: in regular transactions, in read-only transactions, and now also nontransactional, with no guarantees. Imagine that you have to introduce an operation that writes data into a unit of work that was supposed to only read data. Imagine that you have to reorganize operations that were nontransactional to be transactional. Our recommendation is to not use the autocommit mode in an application, and to apply read-only transactions only when there is an obvious performance benefit or when future code changes are highly unlikely. Always prefer regular ACID transactions to group your data-access operations, regardless of whether you read or write data. Having said that, Hibernate and Java Persistence allow nontransactional data access. In fact, the EJB 3.0 specification forces you to access data nontransactionally if you want to implement atomic long-running conversations. We ll approach this subject in the next chapter. Now we want to dig a little deeper into the consequences of the autocommit mode in a plain Hibernate application. (Note that, despite our negative remarks, there are some good use cases for the autocommit mode. In our experience autocommit is often enabled for the wrong reasons and we wanted to wipe the slate clean first.)

Test specifics: Java1.4 on Windows XP on a PII/333 laptop, in battery mode, in midflight between Los Angeles and Portland, Oregon. Your results may vary.

Let s first get an overview of the available tools, the artifacts they use as source input, and the output that is produced. Figure 2.1 shows various import and

UML Model XML/XMI AndroMDA Persistent Class Java Source Mapping Metadata Annotations Data Access Object Java Source <hbm2dao> Documentation HTML <hbm2doc>

Improving library lookup The least elegant part of this build and test process is the need to place native libraries onto the path of the run time. Java 1.2 added a new property, java.library. path, to specify the search path for native libraries. Let s try setting this property in our JUnit test and see if it works. Here is the new target:

<annotationcon guration> <hbm2java> <hbm2java> Hibernate Metamodel <hbm2ddl> <hbm2hbmxml> <jdbccon guration> <con guration> Database Schema Mapping Metadata XML

<target name="test" depends="cc-windows"> <junit printsummary="withOutAndErr" failureproperty="tests.failed" fork="yes"> <sysproperty key="java.library.path" value="${dist.dir}"/> <classpath> <pathelement location="${classes.dir}" /> <pathelement path="${dist.dir}" /> <pathelement path="${java.class.path}" /> </classpath> <formatter type="plain" usefile="false"/> <test name="org.example.antbook.cpu.CpuInfoTest" /> </junit> <fail if="tests.failed">Tests failed</fail> </target>

export tasks for Ant; all the functionality is also available with the Hibernate Tools plug-ins for Eclipse. Refer to this diagram while reading this chapter.1

Notice how we have removed the deploy target from our dependency list; we no longer need it, nor do we need to remove a library from our JRE as part of the clean target. We should find supporting other operating systems easier too, as we no longer need to worry about the OS-specific name of the shared library that <cc> is going to generate. What happens when we clean up the previous build and run this target It all works as planned, provided the fork attribute is set to true. Set it to false and the run time does not pick up the property setting, so the library is not loaded: all the tests fail. Remember when using <java> to run Java programs with native libraries, always fork the JVM.

Hibernate Tools for Eclipse IDE The Hibernate Tools are plug-ins for the Eclipse IDE (part of the JBoss IDE for Eclipse a set of wizards, editors, and extra views in Eclipse that help you develop EJB3, Hibernate, JBoss Seam, and other Java applications based on JBoss middleware). The features for forward and reverse engineering are equivalent to the Ant-based tools. The additional Hibernate Console view allows you to execute ad hoc Hibernate queries (HQL and Criteria) against your database and to browse the result graphically. The Hibernate Tools XML editor supports automatic completion of mapping files, including class, property, and even table and column names. The graphical tools were still in development and available as a beta release during the writing of this book, however, so any screenshots would be obsolete with future releases of the software. The documentation of the Hibernate Tools contains many screenshots and detailed project setup instructions that you can easily adapt to create your first Hello World program with the Eclipse IDE.