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POwhat is the Difference Between singleton and prototype scopes in Spring 2.5
 

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    <p>i read tutorial about spring bean scopes in that they mentioned if bean scope is <code>prototype</code> Spring container will create new object every <code>context.getBean("id")</code> statement. and if we specify scope is <code>singleton</code> it will create only one object even though we write <code>context.getBean("id")</code> statement two times or more... i did small example</p> <pre><code>Demo.java public class Demo { public static void main(String[] args) { ApplicationContext con=new ClassPathXmlApplicationContext("spconfig.xml"); Person p=(Person)con.getBean("person"); Person q=(Person)con.getBean("person"); System.out.println(" P hashCode :"+p.hashCode()); System.out.println(" Q hashCode :"+q.hashCode()); if (p==q) { System.out.println("Same instance!"); } else { System.out.println("Different instance"); } } } </code></pre> <p>the above program prints</p> <pre><code> P hashCode :18303751 Q hashCode :18303751 Same instance! </code></pre> <p>But in <code>Person</code> bean scope i given <code>scope="prototype"</code> why it is printing same Hashcode ????</p> <p>Explain anyone...</p> <p>Thanks in Advance...</p> <h2> spconfig.xml</h2> <pre><code>&lt;!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd"&gt; &lt;beans&gt; &lt;bean id="person" class="demo.Person" scope="prototype"&gt; &lt;property name="name" value="Hello World" /&gt; &lt;/bean&gt; &lt;/beans&gt; </code></pre> <h2> Person.java</h2> <pre><code>package demo; public class Person { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } public void printHello() { System.out.println("Hello ! " + name); } @Override public int hashCode() { return super.hashCode(); } } </code></pre>
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    1. COThere should not be two same objects returned in any way. I just executed your peice of code (Assuming person to be a simple POJO class with an attribute 'name') and I got two different objects !! Have you overridden hashcode() within Person to return something like name.hashCode() ?
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    2. COI just tried your newest code and got: P hashCode :763970039 Q hashCode :239720060 Different instance
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    3. CO@ Jintian DENG : Ya problem with Jar files... earlier i placed old jar files later i checked with New jars its working fine....
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