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achieving sub transaction
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created by <a href="http://community.jboss.org/people/techy_kans">Kannan S</a> in <i>EJB 3.0 Development</i> - <a href="http://community.jboss.org/message/567017#567017">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi all</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>We have a unique problem in our application. We have got five to six EAR files out of which two ear files interact with the database and one EAR file is a MDB listener. Lets say one of our db interacting EAR files, which is ejb module, is, Business.EAR The following is the main way the business is implemented.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The bean name is BusinessProcessorBean.java for which we have interceptor called PreProcessingInterceptor. The following is the code in PreProcessingInterceptor.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java"><font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> PreProcessingInterceptor<font color="navy">{</font>
@AroundInvoke
<font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> doPreProcessing()<font color="navy">{</font>
<font color="navy"><b>try</b></font><font color="navy">{</font>
       1. <font color="navy"><b>do</b></font> some db operations
       2. InvocationContext.proceed() -  call the bean
<font color="navy">}</font><font color="navy"><b>catch</b></font>(Exception exp)<font color="navy">{</font>
       System.out.println(<font color="red">"Exception "</font>+exp);
<font color="navy">}</font><font color="navy"><b>finally</b></font><font color="navy">{</font>
       PostProcessingInterceptor ppi = <font color="navy"><b>new</b></font> PostProcessingInterceptor();
       3.ppi.doPostProcessing();
<font color="navy">}</font>
<font color="navy">}</font>
<font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Now we have got a problem in which there may be an exception at the end of point 1 or at the end of point 3. We want to have atleast half transaction in DB so that we can get some data from the database. I came to know that we can do nested transaction . Our bean is container managed. How do i change it to bean manage so that i can re write the java code some thing like</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive_text_macro jive_macro_code"><p>public class PreProcessingInterceptor{</p><p>@AroundInvoke</p><p>public void doPreProcessing(){</p><p> try{</p><p>       a. transaction.begin();     </p><p>       1. do some db operations</p><p>       b. transaction.commit();        </p><p>       2. InvocationContext.proceed() -  call the bean</p><p>}catch(Exception exp){</p><p>       System.out.println("Exception "+exp);</p><p>}finally{</p><p>       PostProcessingInterceptor ppi = new PostProcessingInterceptor();</p><p>       c. transaction.begin();  </p><p>       3.ppi.doPostProcessing();</p><p>       d. transaction.commit();</p><p>}</p><p>}</p><p>}</p></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Please guide me so that our application saves data atleast in a few tables rather than not updating any tables.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Regards</p><p>Kannan.S</p></div>
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