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Security Perfect security is a distant ideal; if you have a password in a computer, you have a security risk. Our deployment process is amenable to working on secured systems where server controls keep the Tomcat management application inaccessible to all but local callers. It will also work through SSH tunnels, using the passive="true" option on <ftp> and the option to customize ports and servers for <ftp> and <telnet>. We have also gained the ability to work with those operations groups that want to control the process. They can keep the configuration files for their servers on their system, and run the code. We can even deploy via email or CD: just <mail> the deployment files to operations with a please install message, or <copy> the files to a CD-ROM that you can physically hand to them. No matter how the files get to the server, running ant at the command prompt will get the application installed. This is a powerful build process. We have not delved into generating custom WAR files in this task, but the steps are obvious: use the properties in the per-target and perserver configuration files to control <webdoclet> and <war>. You do need to run a clean build on the system when switching targets. Rather than remembering to do this every time, save the target server s name to a properties file in the dist directory. Next build, load, and compare this to the current target. When the server names are different, your build file should trigger a cleanup. Now that we have put our deployment process in place, we will take a brief look at the deployment processes of some different application servers.

lections. Obviously, you never have to enable transitive persistence for a collection that references value-typed classes here the lifecycle of the associated objects is dependent and implicit. Fine-grained control of dependent lifecycle is relevant and available only for associations between entities.

There are so many different application servers, each with its own deployment steps, that we could probably dedicate multiple chapters to the subject. Instead we are going to look at some of the servers that have special <ant> tasks, and then discuss how to work with the others.

What is the relationship between cascade and inverse There is no relationship; both are different notions. The noninverse end of an association is used to generate the SQL statements that manage the association in the database (insertion and update of the foreign key column(s)). Cascading enables transitive object state changes across entity class associations.

Here are a few examples of cascading options in XML mapping files. Note that this code isn t from a single entity mapping or a single class, but only illustrative:

Tomcat 4.0 and 4.1 Tomcat 4.0 and 4.1 share the same deployment process; Ant issues HTTP GET requests to the management servlet. Tomcat 4.1 makes this process slightly easier, but if you have a process that deploys to Tomcat 4.0, it should still work with the later version. Deploying to Tomcat 4.0 We have already shown how to deploy to Tomcat 4.0. The management servlet is a security risk: anyone can pick up the base-64 coded authentication string and control the web server. This is a big issue; the <get> task does not support digest authentication so you cannot safely deploy to a production system with it. Anyone could listen to the deployment requests and then issue their own.

<many-to-one name="parent" column="PARENT_CATEGORY_ID" class="Category" cascade="save-update, persist, merge"/> ... <one-to-one name="shippingAddress" class="Address" cascade="save-update, lock"/> ... <set name="bids" cascade="all, delete-orphan" inverse="true"> <key column ="ITEM_ID"/> <one-to-many class="Bid"/> </set>

You must secure the servlet with an IP address valve, which restricts access to a given IP address. For maximum security, configure the valve to permit management requests from the local server, with this fragment in server.xml:

As you can see, several cascading options can be combined and applied to a particular association as a comma-separated list. Further note that delete-orphan isn t included in all. Cascading options are declared with annotations in two possible ways. First, all the association mapping annotations, @ManyToOne, @OneToOne, @OneToMany, and @ManyToMany, support a cascade attribute. The value of this attribute is a single or a list of javax.persistence.CascadeType values. For example, the XML illustrative mapping done with annotations looks like this:

<Context path="/manager" docBase="manager" debug="0" privileged="true"> <Valve className="org.apache.catalina.valves.RemoteAddrValve" allow="127.0.0.1" /> </Context>

@ManyToOne(cascade = { CascadeType.PERSIST, CascadeType.MERGE }) @JoinColumn(name = "PARENT_CATEGORY_ID", nullable = true) private Category parent; ... @OneToMany(cascade = CascadeType.ALL) private Set<Bid> bids = new HashSet<Bid>();

The deployment process introduced in section 18.5 works perfectly well with systems so configured. Deploying to Tomcat 4.1 At the time of writing, Tomcat 4.1 is still only in an Alpha release phase. It contains some features that make it very appealing as a development target: a JMX management API, a reworked management applet designed for integration with build tools, and its own Ant task to install and remove applications:

Obviously, not all cascading types are available in the standard javax.persistence package. Only cascading options relevant for EntityManager operations, such as persist() and merge(), are standardized. You have to use a Hibernate extension annotation to apply any Hibernate-only cascading option:

@ManyToOne(cascade = { CascadeType.PERSIST, CascadeType.MERGE }) @org.hibernate.annotations.Cascade( org.hibernate.annotations.CascadeType.SAVE_UPDATE ) @JoinColumn(name = "PARENT_CATEGORY_ID", nullable = true) private Category parent; ... @OneToOne @org.hibernate.annotations.Cascade({ org.hibernate.annotations.CascadeType.SAVE_UPDATE, org.hibernate.annotations.CascadeType.LOCK }) @PrimaryKeyJoinColumn private Address shippingAddress; ... @OneToMany(cascade = CascadeType.ALL) @org.hibernate.annotations.Cascade( org.hibernate.annotations.CascadeType.DELETE_ORPHAN ) private Set<Bid> bids = new HashSet<Bid>();

<install url="http://${target.server}:${target.port}/manager" username="${target.username}" password="${target.password}" path="${target.appname}" war="file://${webapp.path}"/>