MPE/IX Software Developer's Kit (SDK) for Java, Version 1.2.2
MPE documents | |
 Complete PDF | |
| Table of Contents | |
| Index |
Commercial Systems Division A major new release of Java, Version 1.2.2, is included with this release of MPE/iX. This article briefly describes some of the changes. One change is the name; the former Java Developer's Kit (JDK) is now called the Software Developer's Kit (SDK) for Java. You will also find in the literature that SDK 1.2 is frequently referred to as the Java 2 Platform. This is done merely to emphasize the large increase in functionality over JDK 1.1.x (which was presumably, although not explicitly, the Java 1 Platform). The Java 2 Platform does not indicate an SDK version of 2.0. Feel free to be confused by this. This article does not attempt to cover all the new features of SDK 1.2, of which there are hundreds. Instead, it covers a small number of changes that are visible to the casual user. Programmers wishing to take advantage of all the new APIs and features can obtain a list at new features in the Java 2 platform at http://java.sun.com/products/jdk/1.2/docs/relnotes/features.html. Users just getting started with Java and wanting to learn the language may want to reference the tutorial at http://java.sun.com/docs/books/tutorial/index.html. HTML format documentation was previously included as part of the JDK release. Because of the amount of disk space consumed by these files, they are now separately downloadable and installable from CSY's Jazz web server. As a result, you have the option of not installing the files at all, or of installing them on a different system if you do not run web server software on your HP 3000. The files can be downloaded from http://jazz.external.hp.com/src/java. Navigate to the JDK 1.2 download page and select the HTML Documentation Files package. You can also browse the documentation on-line at http://java.sun.com/products/jdk/1.2/docs/index.html. Previous versions of Java delivered for the HP 3000 included a Motif implementation of the Abstract Windowing Toolkit (AWT). The files comprising the AWT consumed a large amount of disk space, and feedback indicated that few users found the Motif implementation useful. We have discontinued distributing the AWT as part of our Java offering. For applications that require AWT functionality, the Remote AWT for Java technology from IBM can be used to allow graphical applications running on the HP 3000 to have their graphical displays redirected to a client system that also runs the Remote AWT software. The Remote AWT software is available at no charge from http://www.alphaworks.ibm.com/tech/remoteawtforjava. As with previous Java versions, you must stream JINSTJDK.INSTALL.JAVA to actually install the SDK on your system. One minor but noticeable change in this release is in the directory structures for the Java product. The top level directory is still /usr/local/java/<version>/, with <version> being jdk1.2.2 in this release. As in previous releases, there are subdirectories /bin and /lib at this level, containing binaries and libraries, respectively. New at this level is a /jre (for Java Runtime Environment) subdirectory, which is also subdivided into /bin and /lib subdirectories. This change is transparent to users, who should still use /usr/local/java/latest/bin as the location for executable programs. Further subdivision has happened in the libraries hierarchy; there is now a /classic subdirectory where the executable library (XL) containing most JVM functionality resides. This is in preparation for supporting multiple Java Virtual Machines running in the same directory hierarchy in a future release. Certain command line options to Java that have been supported in previous releases are actually nonstandard, and not guaranteed to be available on all VM implementations. To help identify such nonstandard options, they now must be prefixed by -X. As an example, the -verbose option is standard, and thus is specified as -verbose on both 1.1.x and 1.2.x versions. -nojit is nonstandard, so -nojit works on the 1.1.x releases, but must be specified as -Xnojit on 1.2.x releases. Typing java with no options or filenames causes a list of standard options to be printed. Typing java -X causes a list of nonstandard options to be printed. Releases prior to JDK 1.1.7 included a JAVAUDC UDC file in PUB.JAVA. In JDK 1.1.7, the UDC file was replaced by two command files in PUB.SYS: JAVA (to invoke the JVM) and JAVAC (to invoke the javac compiler).
If you have previously installed a web download version of JAVA 2 on your HP 3000, the installation will have created command files named JAVA2 and JAVA2C in PUB.SYS. With SDK 1.2.2, these files are no longer required and you can purge them. The JAVA and JAVAC command files distributed with this release will work correctly with both older JDK1.1.x versions of Java, and newer 1.2.x versions.
|
Introducing LDAP C-SDK/iX |
HP Driver for JDBC |