On Nov 28, 2005, at 12:14 AM, Manu George wrote:
Hi,
In openejb-jar.xml file for a cmp entity bean if the
cmp-connection-factory element contains a name tag instead of a
resource-link tag the deployer deploys the ejb.
<cmp-connection-factory>
<name>DefaultDatasource</name>
</cmp-connection-factory>
This is correct as per the schema but it gives a null pointer
exception on trying to call the EJB.The correct syntax from geronimo
wiki is
<cmp-connection-factory>
<application>null</application>
<module>org/apache/geronimo/DefaultDatabase</module>
<name>DefaultDatasource</name>
</cmp-connection-factory>
The schema is as follows
<xsd:element name="cmp-connection-factory"
type="gernaming:resource-locatorType"/>
<xsd:complexType name="resource-locatorType">
<xsd:sequence>
<xsd:choice>
<xsd:group ref="gernaming:objectNameGroup"/>
<xsd:element name="resource-link" type="xsd:string"/>
<xsd:element name="target-name" type="xsd:string"/>
<xsd:element name="url" type="xsd:string"/>
</xsd:choice>
</xsd:sequence>
</xsd:complexType>
<xsd:group name="objectNameGroup">
<xsd:annotation>
<xsd:documentation>This group contains the components
of a jsr-77 object name</xsd:documentation>
</xsd:annotation>
<xsd:sequence>
<xsd:element name="domain" type="xsd:string"
minOccurs="0"/>
<xsd:element name="server" type="xsd:string"
minOccurs="0"/>
<xsd:element name="application" type="xsd:string"
minOccurs="0"/>
<xsd:element name="module" type="xsd:string"
minOccurs="0"/>
<xsd:element name="type" type="xsd:string"
minOccurs="0"/>
<xsd:element name="name" type="xsd:string"/>
</xsd:sequence>
</xsd:group>
Since application an module has minOccurs as 0 only the name
attribute is required.
My question is whether the syntax given below is valid? If so there
is some problem with the code .On the other hand if the syntax is
invalid then the schema needs to be modified.
<cmp-connection-factory>
<name>DefaultDatasource</name>
</cmp-connection-factory>
The format with resource-link does some gbean queries during the
deployment process to look for a gbean matching a pattern including the
specified name. In order for deployment to work, the gbean has to be
available during the deployment process. As a result, it is difficult
to make a scenario in which a successfully deployed resource-link won't
work at runtime.
However, the format with the name components (name, module,
application) assumes you know what you are doing and simply constructs
the target gbean name according to your instructions. Name parts you
leave out match the current context. There is no attempt whatsoever
to verify that any such gbean exists at deployment time. This is
mostly useful if you are trying to set up circular references between 2
modules, but might be useful at other times.
Now it is certainly possible to specify a (different) application, the
same module name, and the name. This would be an unusual situation but
certainly possible. It is also conceivable that you could deploy a
gbean to act as the datasource in the ejb jar itself, in which case
supplying only the name component would be correct. However I think
these are sufficiently unlikely so that I would not object to making
the <module> element mandatory in this format. Any other opinions?
thanks
david jencks
