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Now suppose you are going to accept a list of integer numbers as the suffixes of your sequence generator. Each number will be formatted into four digits by an instance of java.text. DecimalFormat. package com.apress.springrecipes.sequence; ... public class SequenceGenerator { ... private List<Object> suffixes; public void setSuffixes(List<Object> suffixes) { this.suffixes = suffixes; } public synchronized String getSequence() { StringBuffer buffer = new StringBuffer(); ... DecimalFormat formatter = new DecimalFormat("0000"); for (Object suffix : suffixes) { buffer.append("-"); buffer.append(formatter.format((Integer) suffix)); } return buffer.toString(); } } Then define several suffixes for your sequence generator in the bean configuration file as usual. <bean id="sequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> <property name="prefixGenerator" ref="datePrefixGenerator" /> <property name="initial" value="100000" /> <property name="suffixes"> <list> <value>5</value> <value>10</value> <value>20</value> </list> </property> </bean> However, when you run this application, you will encounter a ClassCastException, indicating that the suffixes cannot be cast into integers because their type is String. Spring treats every element in a collection as a string by default. You have to set the type attribute of the <value> tag to specify the element type.

You want to expose a service from your Java application for other Java-based clients to invoke remotely. Because both parties are running on the Java platform, you can choose a pure Java-based solution without considering cross-platform portability.

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<bean id="sequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> ... <property name="suffixes"> <list> <value type="int">5</value> <value type="int">10</value> <value type="int">20</value> </list> </property> </bean> Or you may set the value-type attribute of the collection tag to specify the type for all elements in this collection. <bean id="sequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> ... <property name="suffixes"> <list value-type="int"> <value>5</value> <value>10</value> <value>20</value> </list> </property> </bean> In Java 1.5 or higher, you can define your suffixes list with a type-safe collection that stores integers. package com.apress.springrecipes.sequence; ... public class SequenceGenerator { ... private List<Integer> suffixes; public void setSuffixes(List<Integer> suffixes) { this.suffixes = suffixes; } public synchronized String getSequence() { StringBuffer buffer = new StringBuffer(); ... DecimalFormat formatter = new DecimalFormat("0000"); for (int suffix : suffixes) { buffer.append("-"); buffer.append(formatter.format(suffix)); }

Remote Method Invocation (RMI) is a Java-based remoting technology that allows two Java applications running in different JVMs to communicate with each other. With RMI, an object can invoke the methods of a remote object. RMI relies on object serialization to marshal and unmarshal method arguments and return values.

return buffer.toString(); } } Once you have defined your collections in a type-safe way, Spring will be able to read the collection s type information through reflection. In this way, you no longer need to specify the value-type attribute of <list>. <bean id="sequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> ... <property name="suffixes"> <list> <value>5</value> <value>10</value> <value>20</value> </list> </property> </bean>

Considering the typical RMI usage scenario, to expose a service through RMI, you have to create the service interface that extends java.rmi.Remote and whose methods declare throwing java.rmi.RemoteException. Then you create the service implementation for this interface. After that, you start an RMI registry and register your service to it. As you can see, there are quite a lot of steps required for exposing a simple service. To invoke a service through RMI, you first look up the remote service reference in an RMI registry, and then you can call the methods on it. However, to call the methods on a remote service, you must handle java.rmi.RemoteException in case of any exception thrown by the remote service. Fortunately, Spring s remoting facilities can significantly simplify the RMI usage on both the server and client sides. On the server side, you can use RmiServiceExporter to export a Spring bean as an RMI service, whose methods can be invoked remotely. It s just several lines of bean configuration without any programming. Beans exported in this way don t need to implement java.rmi.Remote or throw java.rmi.RemoteException. On the client side, you can simply use RmiProxyFactoryBean to create a proxy for the remote service. It allows you to use the remote service as if it were a local bean. Again, it requires no additional programming at all.

When using the basic collection tags to define collections, you can t specify the concrete class of a collection, such as LinkedList, TreeSet, or TreeMap. Moreover, you cannot share a collection among different beans by defining it as a stand-alone bean for other beans to refer to.

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