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What is JbyJ
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JbyJ is a plug-in for 4D. It enables followings:
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1
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JbyJ enables 4D to connect to
other 4D in a network and call its project methods.
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2
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JbyJ enables Java programs to
connect to 4D in a network and call its project methods.
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It is possible to call project methods mutually regardless of 4D versions(v6.0-v11) and regardless of 4D application types(mono-4D, 4D Server, 4D Client). And the project methods can be called from Java applications, applets, servlets, JSPs in a network.
JbyJ requires the setup of Java
environments because it uses Java RMI (Remote Method Invocation).
RMI: http://java.sun.com/products/jdk/rmi/
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JbyJ Files
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JbyJ consists of following files besides the plug-in
file.
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JbyJ_xxx.jar
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This file is a Java archive file
which is located in RonriKobo folder.
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JbyJClasses_xxx.jar
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This file is a class library to
develop Java programs which connect to 4D and call the project methods.
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JbyJAdaptor_xxx.jar
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JbyJAdaptor_xxx.jar is a servlet.
It behaves as a mediator between RMI and HTTP protocols.
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Note: In JbyJ version 4.0.1 or later, JbyJ_xxx.jar and JbyJAdaptor_xxx.jar are located at Plugins/JWorld_xxx.bundle/Contents/RonriKobo.
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Classification
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JbyJ is classified into JbyJ STD and JbyJ PRO.
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JbyJ STD
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4D plugged JbyJ STD can accept
connections from other 4D. But it cannot accept connections from any
Java programs.
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JbyJ PRO
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4D plugged JbyJ PRO can accept
connections from other 4D like JbyJ STD. In addition, it can accept
connections from Java programs (JSP, servlet, applet, application and
so on), which are developed by using JbyJClasses_xxx.jar.
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System requirements
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JbyJ works with 4th Dimension, 4D Server v 6.0.6 or later in Mac OS and Windows.
JbyJ cannot work with v2004 or earlier versions of 4D on Intel-based Macs, because it cannot work in Rosseta. On Intel-based Macs, you need to use JbyJ ver 4.1.1 or later with 4D v11 or later.
In Windows JbyJ requires a Java virtual machine from Sun Microsystems.
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Java virtual machine ( JVM )
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JbyJ requires a Java virtual machine (JVM) to run. The Java virtual machine is launched by JWorld which is another 4D plugin.
IIn Mac OS X, JbyJ uses the built-in JVM.
In Windows, JbyJ requires Sun's J2SE(Java2 Platform Standard Edition) . You can download the latest J2SE at the following URL.
http://java.sun.com/javase/downloads/
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Protocols for JbyJ
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JbyJ uses the RMI protocol to communicate with other 4D.
However this protocol cannot be used by some of firewalls.
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In order to connect to other 4D, JbyJ has two plug-in
methods "JbyJ Connect server" and "JbyJ Connect server by servlet". The
former uses RMI only, the latter uses HTTP (or HTTPS) between the
source 4D and the HTTP server, and then uses RMI between the HTTP
server and the destination 4D. In the latter case, the servlet
JbyJAdaptor_xxx.jar must be used as a mediator between the two protocols. It
works with a servlet container like Jetty or Tomcat. The HTTP server
and the destination 4D may be located in a computer or in two computers
in a network individually. In the demos for JbyJ, Jetty is used as a HTTP
server and servlet container.
Jetty: http://jetty.mortbay.org/
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