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; "Using Java objects" in Chapter 37, "Integrating J2EE and Java Elements in CFML Applications," in ColdFusion MX Developer's Guide

 
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:

  1. Call the cfobject tag, to load the class. See the example code.
  2. Use the init method with appropriate arguments, to call a constructor. For example:
    3. <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, this 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.