asp.net ean 13

asp.net ean 13

asp.net ean 13

asp.net ean 13

asp.net ean 13

asp.net ean 13,

asp.net ean 13,
asp.net ean 13,

asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,

asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,
asp.net ean 13,

classloaders: the original Ant classloader and the new one. Either fork or track down the errant JAR in the parent or child classloader and remove it. You cannot execute a JAR in the same JVM; you must fork instead. Alternatively, you can specify the actual class inside to run, although then any JAR files referenced in the manifest will not be loaded automatically. Memory hungry or leaky Java programs should run in their own JVM with an appropriate memory size defined. Forking also lets you run code in a version of Java that is different from the one you started with. With all these reasons to fork, you might feel that it is not worth trying to run in the same JVM, but there is no need to worry. Most programs run perfectly well inside the Ant JVM, so well that it soon becomes a more convenient way of starting Java programs than shell scripts or batch files, primarily because it makes setting up the classpath so easy. It also only takes one attribute setting to move a program into its own JVM. 5.2.1 Introducing the <java> task The name of the task to start Java programs is, not very surprisingly, <java>. It has many options, and is well worth studying. We demonstrated it briefly in our introductory build file in chapter 2. Now it is time to study it in-depth. First, let s look at running our own code, by calling a routine to search over the index files we have somehow created. The Java class to do this is simple, taking two arguments: the name of an index directory and the search term. It then searches the index for all entries containing the term. Listing 5.1 shows the entry point.

This listener uses two system transactions to handle one JSF request. One transaction is started in the Restore View phase and committed after the Invoke

package org.example.antbook; import org.example.antbook.common.Document; import org.example.antbook.common.SearchUtil; public class Search { public static void main(String args[]) throws Exception { if(args.length!=2) { System.out.println("search: index searchterm"); System.exit(-1); } SearchUtil.init(args[0]); Document[] docs = SearchUtil.findDocuments(args[1]); for (int i=0; i < docs.length; ++i) { System.out.println((i + 1) + ": " + docs[i].getField("path")); } System.out.println("files found: "+docs.length); } }

Application phase Any system exceptions in these phases trigger an automatic rollback of the transaction A different response can be prepared with an exception handler (this is weak point in JSF you have to use a servlet exception handler in webxml to do this) By committing the first transaction after the action method execution is complete, you keep any database locks created by SQL DML in the action methods as short as possible A second transaction spans the Render Response phase of a JSF request Any view that pulls data on demand (and triggers initialization of lazy loaded associations and collections) runs in this second transaction This is a transaction in which data is only read, so no database locks (if your database isn t running in repeatable read mode, or if it has a multiversion concurrency control system) are created during that phase.

This program is a typical Java entry point class. We validate our arguments, exiting with an error code if they are invalid, and can throw an Exception for the run time itself to handle. So let s run it against an existing index:

Finally, note that the persistence context spans the conversation, but that flushing and commits may occur during the conversation Hence, the whole conversation isn t atomic You can disable automatic flushing with @Begin(flushMode = FlushModeTypeMANUAL) when a conversation is promoted to be longrunning; you then have to call flush() manually when the conversation ends (usually in the method marked with @End) The persistence context is now available through Seam injection in any component, stateless or stateful It s always the same persistence context in a conversation; it acts as a cache and identity map for all entity objects that have been loaded from the database An extended persistence context that spans a whole conversation has other benefits that may not be obvious at first.

<target name="run-search" depends="compile"> <echo>running a search</echo> <java classname="org.example.antbook.Search"> <arg file="${index.dir}"/> <arg value="WAR"/> </java> </target>