I'm newbie in J2EE, having read a bunch of stuff I'm still in the wood. Please bear
with me.
Here's an example descriptor:
| <ejb-jar>
| <enterprise-beans>
| <session>
| <ejb-name>beanA</ejb-name>
| ...
| <resource-ref>
| <res-ref-name>jdbc/dbname</res-ref-name>
| <jndi-name>jdbc/dbname</jndi-name>
| <res-type>javax.sql.DataSource</res-type>
| <res-auth>Container</res-auth>
| <res-sharing-scope>Shareable</res-sharing-scope>
| </resource-ref>
|
| <env-entry>
| <env-entry-name>Var1</env-entry-name>
| <env-entry-type>java.lang.String</env-entry-type>
| <env-entry-value>Some value</env-entry-value>
| </env-entry>
| ...
|
|
| <ejb-ref>
| <ejb-ref-name>ejb/ses1</ejb-ref-name> QUESTION 1: ejb/ses1??? Is it "SS1" JNDI
name? Why isn't JNDI name declared in "ejb-jar.xml"??
| <ejb-ref-type>session</ejb-ref-type>
| <home>tests.SS1Home</home>
| <remote>tests.SS1</remote>
| </ejb-ref>
|
| <ejb-local-ref>
| <ejb-ref-name>ejb/locses1</ejb-ref-name>
| <ejb-ref-type>session</ejb-ref-type>
| <local-home>tests.LocalSS1Home</local-home>
| <local>tests.LocalSS1</local>
| </ejb-local-ref>
| ...
|
| </session>
|
| <session>
| <ejb-name>SS1</ejb-name>
| <home>tests.SS1Home</home>
| <local-home>tests.LocalSS1Home</local-home>
| <remote>tests.SS1</remote>
| <local>tests.LocalSS1</local>
| <ejb-class>tests.SS1Bean</ejb-class>
| ...
| </session>
| ...
| </enterprise-beans>
| </ejb-jar>
|
QUESTION 2. What's the purpose of "ejb-ref", "ejb-local-ref" in EJB deployment
descriptor? Is it that if one EJB (ejb/beanA) depends on another, say (ejb/ses1) (by
virtue of having the dependency declared in deployment descriptor) - deployment of
"ejb/beanA" would fail if "ejb/ses1" was not deployed on the target server? That
DEPLOYMENT of an EJB (depending on a particular resource) would FAIL if that resource
it depends on is absent on the destination server? Is this the only purpose?
QUESTION 3. Should I specify JNDI names for <ejb-name> tag?
QUESTION 4. Is "fully qualified" JNDI name (for the above bean):
JNDI name = "java:comp/" + <ejb-name>
example: "java:comp/ejb/beanA"
OR just:
JNDI name = "java:" + <ejb-name>
example: "java:ejb/beanA"
Is this true for all application servers? JBoss? Or does it depends on "ejb-name"
to "jndi-name" mapping as specified in "jboss.xml" (see below)
QUESTION 5. For JBoss EJB's, "ejb-name" to "jndi-name" mapping is done in "jboss.xml":
| <jboss>
| <enterprise-beans>
| <entity>
| <ejb-name>beanB</ejb-name>
| <local-jndi-name>ejb/beanB</local-jndi-name>
| </entity>
| <session>
| <ejb-name>beanA</ejb-name>
| <jndi-name>ejb/beanA</jndi-name>
| </session>
| </enterprise-beans>
| </jboss>
|
Does it mean if "jndi-name" is NOT specified, then by default, "jndi-name" of the bean
would equal "ejb-name"?
"java:com/" + <ebj-name>
EQUALS:
"java:com/" + <jndi-name>
EQUALS:
"java:com/beanA"
QUESTION 6. Why "java:comp/"? What's that for? Is it:
a. "java:comp/"
b. "java:comp"
c. "java:"
I think I've seen different versions, getting really confused.
QUESTION 7. For environment variables, it seems:
JNDI name="java:comp/env" +<env-entry-name>
In this case,
"java:comp/env/Var1"
Is this true for all servers?
QUESTION 8. For data sources (JBoss), you need to put "mysql-ds.xml" under "Deploy"
folder:
| <datasources>
| <local-tx-datasource>
| <jndi-name>jdbc/exampleDS</jndi-name>
<connection-url>jdbc:mysql://127.0.0.1:3306/DBName</connection-url>
| <driver-class>...</driver-class>
| <user-name>xxx</user-name>
| <password>xxx</password>
| </local-tx-datasource>
| </datasources>
|
6a. I dont understand why we need to append "java:" in context.lookup:
| context=new InitialContext();
| dataSource=(DataSource) context.lookup("java:jdbc/exampleDS");
|
6b. Can we rename the file name "mysql-ds.xml" to anything we like as long as it
remains in "Deploy" folder? (Tested this on JBoss)
Thanks.
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