title: Transferring Data from Processor to Writer
body: <p>I have a composite item processor as mentioned below. I process items in all processors represented by input object which represents one line from my data file. However, in processor 4, i do some calculation on each item and store it in a map and aggregate it for the whole file. I want to presist this Map in my writer. How can i pass this big map to Writer?</p>
  
  <pre><code>&lt;bean id="myProcessors"
          class="org.springframework.batch.item.support.CompositeItemProcessor"
          scope="step"&gt;
          &lt;property name="delegates"&gt;
              &lt;util:list&gt;
                  &lt;ref bean="processor1" /&gt;
                  &lt;ref bean="processor2" /&gt;
                  &lt;ref bean="processor3" /&gt;
                  &lt;ref bean="processor4" /&gt;
              &lt;/util:list&gt;
          &lt;/property&gt;
      &lt;/bean&gt;
  </code></pre>
  
  <p>Please help.</p>
  
  <p>Thanks.</p>