CFOBJECT: JAVA OR EJB OBJECT |
Description
Creates and manipulates a Java and Enterprise Java Bean (EJB) object.
Syntax
    <cfobject
       type = "Java"
       action = "Create"
       class = "Java class"
       name = "object name">
See also
cfcollection, cfexecute, cfindex, cfreport, cfsearch, cfwddx
Usage
To call Java CFXs or Java objects, ColdFusion uses a Java Virtual Machine(JVM) that is embedded in the process. You can configure JVM loading, location and settings in the ColdFusion Administrator.
Any Java class available in the class path that is specified in the ColdFusion Administrator can be loaded and used from ColdFusion, using the cfobject tag.
To access Java methods and fields, do the following steps: Call the cfobject tag, to load the class. See the example code. Use the init method with appropriate arguments, to call a constructor. For example:
    <cfset ret = myObj.init(arg1, arg2)>
Calling a public method on the object without first calling the init method results in an implicit call to the default constructor. Arguments and return values can be any Java type (simple, array, object). ColdFusion makes the conversions if strings are passed as arguments, but not if they are received as return values.
Overloaded methods are supported if the number of arguments is different.
Calling EJBs
To create and call EJB objects, use the cfobject tag. In the second example below, the WebLogic JNDI is used to register and find EJBHome instances.
Example
    <!--- Example of a Java Object his cfobject call loads the class MyClass
    but does not create an instance object. Static methods and fields
    are accessible after a call to cfobject. --->
    <cfobject
       action = "create"
       type = "java"
       class = "myclass"
       name = "myobj">

    <!---- Example of an EJB - The cfobject tag creates the Weblogic Environment
    object, which is used to get InitialContext. The context object is
    used to look up the EJBHome interface. The call to create() results
    in getting an instance of stateless session EJB. --->

    <cfobject
       action = "create"
       type = "java"
       class = "weblogic/jndi/Environment"
       name = "wlEnv">

    <cfset ctx = wlEnv.getInitialContext()>
    <cfset ejbHome = ctx.lookup("statelessSession.TraderHome")>
    <cfset trader = ejbHome.Create()>
    <cfset value = trader.shareValue(20, 55.45)>
    <cfoutput>
        Share value = #value#
    </cfoutput>
    <cfset value = trader.remove()>

TYPE |
| Optional
Object type: com corba java (The other object types do not take the type attribute.)

ACTION |
| Required
Create: Creates a Java or WebLogic Environment object.

CLASS |
| Required
Java class.

NAME |
| Required
String; name for the instantiated component.