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Unless you are using environment variables to control the Java run time itself or configure a native program started by the Java program you are forking, there is no real reason to use this element Controlling the new JVM You can actually choose a Java run time that is different from the one hosting Ant by setting the command of the JVM with the jvm attribute This is useful if you need to run a program under an older JVM, such as a test run on a Java 11 system, or perhaps a beta version of a future Java release One JVM not well supported is Microsoft s jviewexe, as this one has different command parameters from the standard run times However, nobody has found this much of a limitation, judging by the complete absence of bug reports on the matter.

Summary

As well as specifying the JVM, it is also possible to declare parameters to control it The most commonly used option is the amount of memory to be used, which is so common that it has its own attribute, the maxmemory attribute, and some behindthe-scenes intelligence to generate the appropriate command for Java11 and Java12 systems The memory option, as per the java command, takes a string listing the number of bytes (4096), kilobytes (64), or megabytes (512) to use Usually the megabyte option is the one to supply Other JVM options are specific to individual JVM implementations A call to java -X will list the ones on your local machine Although nominally subject to change without notice, some of the -X options are universal across all current JVMs The memory size parameter is one example.

technique isn t available with annotations or in Java Persistence (this mapping is so rare that nobody asked for annotation support so far). As you can see, as long as you don t plan to create an association to a class hierarchy mapped with implicit polymorphism, associations are straightforward; you don t usually need to think about it. You may be surprised that we didn t show any JPA or annotation example in the previous sections the runtime behavior is the same, and you don t need any extra mapping to get it.

Incremental garbage collection (-Xincgc) is another one you can expect to find on all of Sun s recent Java run times When you start using more advanced options (such as selecting the HotSpot server VM with -server and adding more server specific commands), JVM portability is at risk If you are setting JVM options, make sure to put the JVM argument assignment into a property so that it can be overridden easily:.

Summary

In this chapter, you learned how to map more complex entity associations. Many of the techniques we ve shown are rarely needed and may be unnecessary if you can simplify the relationships between your classes. In particular, many-to-many entity associations are often best represented as two one-to-many associations to an intermediate entity class, or with a collection of components. Table 7.1 shows a summary you can use to compare native Hibernate features and Java Persistence.

<target name="run-search-jvmargs" depends="create-jar"> <property name="Search.JVM.extra.args" value="-Xincgc"/> <java

Table 7.1 Hibernate and JPA comparison chart for chapter 7 Hibernate Core Hibernate supports key generation for shared primary key one-to-one association mappings. Java Persistence and EJB 3.0 Standardized one-to-one mapping is supported. Automatic shared primary key generation is possible through a Hibernate extension. Standardized association mappings are available across secondary tables. Persistent indexes require a Hibernate extension annotation. Fully polymorphic behavior is available, but there is no annotation support for any mappings.

classname="org.example.antbook.Search" classpathref="run.classpath" fork="true" maxmemory="64m"> <jvmarg line="${Search.JVM.extra.args}"/> <arg file="${index.dir}"/> <arg value="WAR"/> </java> </target>

Hibernate supports all entity association mappings across join tables. Hibernate supports mapping of lists with persistent indexes. Hibernate supports fully polymorphic behavior. It provides extra support for any association mappings to an inheritance hierarchy mapped with implicit polymorphism.

You supply generic JVM arguments using <jvmarg> elements nested inside the <java> task The exact syntax of these arguments is the same as for the <arg> elements We set the line in the previous example, as that makes it possible for a single property to contain a list of arguments; if the build file is explicitly setting many JVM arguments, then the alternate means of providing individual arguments is probably better The final option is to specify the starting directory This lets you use relative file references in your code, and have them resolved correctly when running It is usually a bad thing for programs to be so dependent on their location If only the location of files passed in as arguments needs to be specified, then the <arg file> element lets you specify relative files for resolution by Ant itself.