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| <h1>App Clients and JNDI |
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| <p>There are some slight differences between the way OpenEJB does app clients |
| and the way Geronimo does app clients</p> |
| |
| <p>Neither uses the names created via the openejb.jndiname.format. So |
| changing that will (should) have no affect. The idea is that users |
| should be able to set it to be whatever they want it to be and that should |
| not break the App Client code. The openejb.jndiname.format is |
| specifically for "plain" clients and allows them to get the names as they |
| want them.</p> |
| |
| <p>Internally, we bind each EJB proxy under essentially a hardcoded and |
| predictable format and then again using the user supplied format. So |
| there are at minimum two JNDI trees with every EJB proxy. It used to |
| be two at least. Now we have quite a few because of Java EE 6 global |
| JNDI and the support we added for @LocalClient and allowing the same |
| interface to be used as both @Local and @Remote.</p> |
| |
| <p>Basically we have:</p> |
| |
| <ul> |
| <li>openejb/Deployment/<hardcoded internal format></li> |
| <li>openejb/local/<strategy format></li> |
| <li>openejb/remote/<strategy format></li> |
| </ul> |
| |
| <p>The 'openejb/Deployment' section is the non-changing fully qualified name |
| for use internally and by app clients.</p> |
| |
| <p>The 'openejb/remote' section is for "pretty" names looked up via plain |
| clients using the RemoteInitialContextFactory. The protocol can tell |
| the difference between app clients and plain clients and knows which area |
| to look in.</p> |
| |
| <p>The 'openejb/local' section is for "pretty" names looked up via the |
| LocalInitialContextFactory.</p> |
| |
| <p>The "pretty" names are defined by the openejb.jndiname.format and since the |
| user has control of that formatting it's possible that not all proxies can |
| be bound. Say the bean has both a local and remote interface and the |
| user has just "{deploymentId}" or "{ejbName}" as the format. |
| Hence those bind calls use the "optional" set of binding methods.</p> |
| |
| <p>The format of the internal names bound into openejb/Deployment is |
| guaranteed to be unique. It's not pretty to look at obviously, but |
| every possible proxy will be bound there guaranteed. For binding into |
| 'openejb/Deployment' we don't use the "optional" set of binding methods. |
| If something can't be bound it's a deployment issue.</p> |
| |
| <p>The home interface is bound, but with the name of the corresponding |
| business interface rather than the home interface. </p> |
| |
| <p>To be a little bit more clear - Both OpenEJB and Geronimo build their |
| own JNDI trees for the App Client. Geronimo prefers to have its own |
| JNDI tree for the App Client as there are other things in it that are not |
| EJB related. Either way the OpenEJB EJBd protocol can carry the "id" |
| of the App Client and both Geronimo and OpenEJB rely on that.</p> |
| |
| <p>In Geronimo App Clients the id is set to "Deployments" and that tells |
| OpenEJB not to look in the "openejb/remote" section of JNDI as it normally |
| would. It will instead use the "openejb/Deployments" section of JNDI |
| were the names follow a predictable and unchanging format.</p> |
| |
| <p>In OpenEJB App Clients the id is set to the name of the App Client and we |
| instead look in "openejb/client/<id>/" where names are formatted by the |
| user via the application-client.xml.</p> |
| |
| <p>When calls are made from client to server and the App Client module id is |
| not present, we look in openejb/remote/ where names are formatted using the |
| openejb.jndi.format</p> |
| |
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