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However, the work went very slowly, and at 2 AM Hua gave up with half a dozen serious errors remaining What was worse, though, was that she had noticed a fundamental incompatibility between Reiko s business logic and Tim s web services She called the team together for a meeting as soon as they came in the next morning The mood was tense Guys, we ve got a big problem Reiko has written her code to use transactions, but Tim s web services don t support transactions, she said It has to use transactions, said Reiko It s in the functional spec The updates to the database and the updates via the web services have to either all work perfectly, or all be aborted together Without transactions, how else can you abort one update when another one fails But web services don t support transactions yet, said Tim.

As an example, you can create the following resource bundle, messages_en_US.properties, for the English language in the United States. Resource bundles will be loaded from the root of the classpath.

Again, the configuration for exposing a service using HTTP Invoker is similar to that for Hessian and Burlap, except you have to use HttpInvokerServiceExporter instead. <bean name="/WeatherService" class="org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter"> <property name="service" ref="weatherService" /> <property name="serviceInterface" value="com.apress.springenterpriserecipes.weather.WeatherService" /> </bean>

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alert.checkout=A shopping cart has been checked out. To resolve messages from resource bundles, you use ResourceBundleMessageSource as your MessageSource implementation. This bean s name must be set to messageSource for the application context to detect it. You have to specify the base name of the resource bundles for ResourceBundleMessageSource. <beans ...> ... <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource"> <property name="basename"> <value>messages</value> </property> </bean> </beans> For this MessageSource definition, if you look up a text message for the United States locale, whose preferred language is English, the resource bundle messages_en_US.properties, which matches both the language and country, will be considered first. If there s no such resource bundle or the message can t be found, the one messages_en.properties that matches the language only will be considered. If this resource bundle still can t be found, the default messages.properties for all locales will be chosen finally. For more information on resource bundle loading, you can refer to the javadoc of the java.util.ResourceBundle class. Now you can ask the application context to resolve a message by the getMessage() method. The first argument is the key corresponding to the message and the third is the target locale. package com.apress.springrecipes.shop; import org.springframework.context.ApplicationContext; import org.springframework.context.support.FileSystemXmlApplicationContext; public class Main { public static void main(String[] args) throws Exception { ApplicationContext context = new FileSystemXmlApplicationContext("beans.xml"); ... String alert = context.getMessage("alert.checkout", null, Locale.US); System.out.println(alert); } } The second argument of the getMessage() method is an array of message parameters. In the text message, you can define multiple parameters by index: alert.checkout=A shopping cart costing {0} dollars has been checked out at {1}.

Invoking a service exposed by HTTP Invoker is also similar to Hessian and Burlap. This time you have to use HttpInvokerProxyFactoryBean. <bean id="weatherService" class="org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean"> <property name="serviceUrl" value="http://localhost:8080/weather/services/WeatherService" /> <property name="serviceInterface" value="com.apress.springenterpriserecipes.weather.WeatherService" /> </bean>

You have to pass in an object array to fill in the message parameters. The elements in this array will be converted into strings before filling in the parameters. package com.apress.springrecipes.shop; ... public class Main { public static void main(String[] args) throws Exception { ... String alert = context.getMessage("alert.checkout", new Object[] { 4, new Date() }, Locale.US); System.out.println(alert); } } In the Main class, you can resolve text messages because you can access the application context directly. But for a bean to resolve text messages, it has to implement either the ApplicationContextAware interface or the MessageSourceAware interface. Now you can delete the message resolution from the Main class. package com.apress.springrecipes.shop; ... import org.springframework.context.MessageSource; import org.springframework.context.MessageSourceAware; public class Cashier implements BeanNameAware, MessageSourceAware, StorageConfig { ... private MessageSource messageSource; public void setMessageSource(MessageSource messageSource) { this.messageSource = messageSource; } public void checkout(ShoppingCart cart) throws IOException { ... String alert = messageSource.getMessage("alert.checkout", new Object[] { total, new Date() }, Locale.US); System.out.println(alert); } }

In the typical communication model between components, the sender has to locate the receiver to call a method on it. In this case, the sender component must be aware of

When you are asked to develop a web service, you first have to consider which web service development approach you are going to use.

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