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Safari | Python Developer's Handbook -> Java Integration





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Java Integration

If you want to use the Python language and Java integration, you can find in JPython a compatible and complementary couple for Java. Because JPython's interpreter is written in Java itself, you might think why you shouldn't go directly to the point, and use pure Java instead of using JPython. My advice is to go for JPython first because soon you will see how simple it is to do a lot of tasks using JPython's facilities (such as running a piece of Java code without the need for defining a single class). JPython has all the teaching principles on its background, which makes it a language of easy learning.

The full object-oriented programming model provided by the Python language (since its inception) brings power and clearness to the programmer world. This transparency when handling objects makes Python a natural choice for interoperating with Java's object-oriented design, and to be Java's scripting language. Other languages try, even though they were not created to be OO. Object-oriented programming became part of Perl programmer's life in version 5, and Tcl developers can only use OO through an extension called (itcl). It could be argued that Python evolved from the non-object oriented ABC the same way that Perl 5 evolved from Perl 4 and incr tcl from tcl, but Python had its evolutionary process carefully drivenalmost a totally new development effort.

Of course, other scripting languages can be used along with Java and its JVM, but none of them beat JPython in portability and performance, mainly for two reasons: JPython's 100% Java certification, and JPython's capability to translate Python source code directly into optimized Java bytecodes, respectively.

Both Perl and Tcl offer scripting solutions, but none of the solutions offer a more significant value than the JPython solution.

  • Jacl is a 100% Java re-design of the Tcl interpreter, which is considered to be much slower than JPython.

  • Tcl Blend and JPL (for Perl) are other scripting solutions (not 100% Java) that expose some portability problems.

Of course, in both of these cases, it is probably easier to port the Tcl or Perl runtimes than to port the java virtual machine.

For more details about the Java language, you can check out http://www.javasoft.com/.

Java Certification

On July 13, 1998, it was announced that KeyLabs had completed testing JPython to certify that it is 100% pure Java.

The 100% Pure Java Certification Program is part of Sun Microsystems initiative to promote the development of portable applications, applets, beans, class libraries, and servlets written using the Java Programming language. Certification consists of code analysis and testing by an independent test facility (in this case, KeyLabs) to identify compiled code that meets the 100% Pure Java Requirements. The 100% Pure Java certification standards and branding program is intended to give customers confidence in products that display the brand.

Even though JPython has got this certification, you cannot use the 100% Java brand for your own JPython programs. You need to make sure that your product passes the 100% Pure Java certification tests in order to have the rights to use the exclusive 100% Pure Java logo on your packing. For details about this process, read the Certification Guide located at

http://www.javasoft.com/100percent/

Java Links

If you want to use JPython, but you don't know Java yet, or need a quick review, check out the following Java Web sites:

The Java Community

At this Web site, you can join ongoing forums on a variety of Java topics, chat with Java experts, and access community resources, among other things.

http://developer.java.sun.com/developer/community

The Java Tutoriala practical guide for programmers

http://java.sun.com/docs/books/tutorial


Last updated on 1/30/2002
Python Developer's Handbook, © 2002 Sams Publishing

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Index terms contained in this section

integrating
     Java
            JPython 2nd
Java
     integrating
            JPython 2nd
JPython
      integrating Java 2nd
KeyLabs
programming languages
     JPython
            integrating Java 2nd

2002, O'Reilly & Associates, Inc.

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