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Subject: Chapter6 - Creating a CMP Entity Bean
Date: Sun, 5 Dec 2004 11:52:20 +0800
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<H2 align=3Dcenter><!--- Header finished -->Tutorial for building J2EE=20
Applications using JBOSS and ECLIPSE <IMG height=3D2=20
src=3D"http://www.tusc.com.au/tutorial/images/redrulr5.gif" width=3D775 =
align=3Dmiddle=20
border=3D0 name=3DGraphic1></H2>
<P><BR><BR></P>
<H1>Chapter 6. </H1>
<P><IMG height=3D2 =
src=3D"http://www.tusc.com.au/tutorial/images/blurulr6.gif"=20
width=3D785 align=3Dmiddle border=3D0 name=3DGraphic2></P>
<H2>Creating a CMP Entity Bean</H2>
<P>This chapter covers how to create a Container Managed Persistence =
(CMP) EJB=20
component. We will create two CMP beans, Item and Supplier as shown =
below. The=20
Item bean will be responsible for storing the details of items, such as =
their=20
availabability and their prices, for MyStore. The Supplier Bean stores =
details=20
of Suppliers to MyStore. Both beans interact with corresponding tables =
in the=20
database. In CMP this interaction is controlled by the container, in =
this case=20
the JBOSS CMP container. </P>
<P><BR><BR></P>
<P><IMG height=3D353=20
src=3D"http://www.tusc.com.au/tutorial/images/chap6/J2EECaseStudyFlowDiag=
ram.png"=20
width=3D438 align=3Dleft border=3D0 name=3DGraphic16><BR =
clear=3Dleft><BR><BR></P>
<P>All Items have been assigned a unique itemId for housekeeping =
purposes within=20
MyStore, and all suppliers have been assigned a unique supplierID in =
addition to=20
their username which is what they use in accessing the services of =
MyStore.</P>
<P><BR><BR></P>
<P><FONT color=3D#800000><I>Note : It is normal practice to access the =
business=20
methods of CMP beans via a Session bean, that encapsulates the business =
logic=20
and acts as an interface to the lower-level EJB components. In this case =

Supplier and Items are accessed via StoreAccess.</I></FONT></P>
<H3>Tasks :</H3>
<OL>
  <LI>
  <P>Create a CMP bean named Items under package au.com.tusc.cmp.</P>
  <LI>
  <P>Implement the ejbCreate method, with the values of all attributes =
being=20
  passed as arguments and then assigned to the attributes using mutator =
(setter)=20
  methods. </P>
  <LI>
  <P>Add a finder method named findBySupplierID with the following query =
and=20
  signature: </P>
  <P><FONT color=3D#000000><FONT face=3D"Nimbus Roman No9 L"><FONT =
size=3D3><B>query=20
  "SELECT OBJECT(b) FROM MyStoreItem as b where b.supplierID =3D ?1"=20
  </B></FONT></FONT></FONT></P>
  <P><FONT color=3D#000000><FONT face=3D"Nimbus Roman No9 L"><B>method=20
  "java.util.Collection findBySupplierID(java.lang.String supplierID)"=20
  </B></FONT></FONT></P>
  <LI>
  <P>Add a finder method named findByOutOfStock with the following query =
and=20
  signature: </P>
  <P><FONT color=3D#000000><FONT face=3D"Nimbus Roman No9 L"><FONT =
size=3D3><B>query=20
  "SELECT OBJECT(c) FROM MyStoreItem as c where c.quantity =3D 0"=20
  </B></FONT></FONT></FONT></P>
  <P><FONT color=3D#000000><FONT face=3D"Nimbus Roman No9 L"><B>method=20
  "java.util.Collection findByOutOfStock()" </B></FONT></FONT></P>
  <LI>
  <P>Add a business method to get item details with the signature:</P>
  <P><B>public ItemData getItemData()</B></P>
  <LI>
  <P>Add another business method to register delivery of items with the=20
  signature:</P>
  <P><B>public void fillStock(java.lang.Integer quantity)</B></P>
  <LI>
  <P>Add callback methods, required for getting/setting bean context for =
bean=20
  with signatures:</P>
  <P><FONT color=3D#7f0055><B><FONT color=3D#000000>public void</FONT> =
<FONT=20
  color=3D#000000>setEntityContext(EntityContext =
ctx)</FONT></B></FONT></P>
  <P><FONT color=3D#000000><B>public void =
unsetEntityContext()</B></FONT></P>
  <LI>
  <P>Deploy the Item Bean.</P>
  <LI>
  <P>Add a field to the StoreAccess bean to store the Item reference =
(obtained=20
  from JNDI lookup):</P>
  <P><B><FONT color=3D#000000>private ItemLocalHome</FONT> item<FONT=20
  color=3D#000000>LocalHome</FONT></B></P>
  <LI>
  <P>In the ejbCreate method of the StoreAccess bean store this =
reference in the=20
  itemLocalHome variable by invoking the getLocalHome static method in=20
  ItemUtil.</P>
  <LI>
  <P>Add a business method to StoreAccess Bean with the signature:</P>
  <P><B><FONT color=3D#000000>public ItemData</FONT> <FONT=20
  color=3D#000000>getItemData(String itemID) </FONT></B></P>
  <LI>
  <P>Add another business method to StoreAccess Bean with the =
signature:</P>
  <P><B><FONT face=3D"Nimbus Roman No9 L"><FONT color=3D#000000>public=20
  java.util.ArrayList getOutOfStockItems()</FONT></FONT></B> </P>
  <LI>
  <P>Add another business method to StoreAccess Bean with the =
signature:</P>
  <P><FONT color=3D#000000><FONT face=3D"Nimbus Roman No9 L"><B>public=20
  java.util.ArrayList getItemBySupplier(String =
supplierID)</B></FONT></FONT></P>
  <LI>
  <P><FONT color=3D#000000>Create a test client named SessionCMPClient =
under=20
  package au.com.tusc.client. </FONT></P>
  <LI>
  <P><FONT color=3D#000000><FONT face=3D"Nimbus Roman No9 L">Run your =
client and=20
  test the bean.</FONT></FONT></P></LI></OL>
<H3 style=3D"MARGIN-TOP: 0in; MARGIN-BOTTOM: 0in"><BR></H3>
<H3 style=3D"MARGIN-TOP: 0in; MARGIN-BOTTOM: 0in"><B>Create Items CMP =
Entity Bean=20
:</B></H3>
<P style=3D"MARGIN-BOTTOM: 0in"><BR></P>
<P><B>Go To Package Explorer &gt; Expand Mystore (project) node &gt; =
select src,=20
right click and a menu will pop up.</B></P>
<P><B>On the pop up menu &gt; New &gt; Lomboz EJB Creation =
Wizard.</B></P>
<P><B>Enter the package name au.com.tusc.cmp, the bean name Item and =
select the=20
bean type as Container Manged Entity as shown below.</B></P>
<P><IMG height=3D410=20
src=3D"http://www.tusc.com.au/tutorial/images/chap6/CreateEJBWizard.png" =
width=3D525=20
align=3Dleft border=3D0 name=3DGraphic17><BR clear=3Dleft><BR><BR></P>
<P><B>Go to Next and a new screen will pop up as shown below.</B></P>
<P><B>Enter MyStoreItem as the Schema Name.</B></P>
<P><B>Enter Item as the Table name.</B></P>
<P><B>Under Persistent Fields first enter itemID as the Field, with a =
Field Type=20
of java.lang.String, ITEMID as its Database column, and VARCHAR for its =
SQL=20
Type. </B></P>
<P><B>Press Add .. &gt; It will add this field in Fields section, select =
this=20
new field &gt; Press Make Primary Key.</B></P>
<P style=3D"MARGIN-BOTTOM: 0in"><IMG height=3D466=20
src=3D"http://www.tusc.com.au/tutorial/images/chap6/CreateEJBWizardAddPri=
maryKey.png"=20
width=3D523 align=3Dleft border=3D0 name=3DGraphic18><BR =
clear=3Dleft><BR></P>
<P style=3D"MARGIN-BOTTOM: 0in"><B>Similarly, add all the rest of the =
fields of=20
the items table as shown below.</B></P>
<P style=3D"MARGIN-BOTTOM: 0in"><B>Add .. Field: supplierID, Field Type: =

java.lang.String, Database Column: SUPPLIERID, SQL Type: VARCHAR. =
</B></P>
<P style=3D"MARGIN-BOTTOM: 0in"><B>Add .. Field: description, Field =
Type:=20
java.lang.String, Database Column: DESCRIPTION, SQL Type: VARCHAR. =
</B></P>
<P style=3D"MARGIN-BOTTOM: 0in"><B>Add .. Field: quantity, Field Type:=20
java.lang.Integer, Database Column: QUANTITY, SQL Type: INTEGER. =
</B></P>
<P style=3D"MARGIN-BOTTOM: 0in"><B>Add .. Field: price, Field Type:=20
java.lang.Float, Database Column: PRICE, SQL Type: DECIMAL. </B></P>
<P style=3D"MARGIN-BOTTOM: 0in"><BR></P>
<P><IMG height=3D408=20
src=3D"http://www.tusc.com.au/tutorial/images/chap6/CreateEJBWizardAddAll=
Fields.png"=20
width=3D748 align=3Dleft border=3D0 name=3DGraphic5><BR =
clear=3Dleft><BR><BR></P>
<P><B>After adding all these fields, press Finish.</B></P>
<P><B>This will create a package named au.com.tusc.cmp under src, and =
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