iSeries Architecture: Fundamental Strength of the iSeries 19iSeries Architecture: Fundamental Strength of the iSeriesmachine code from Java byte codes. This Java transformer enables the direct execution ofJava on the system without the overhead of interpretation.High-performance Garbage Collection is provided by OS/400 to improve the performance andscalability of Java. An advanced Garbage Collection algorithm allows Java to scale to thelarge numbers of objects expected when running enterprise applications on the server. Overtime, Java is planned to become even more integrated with, and tuned for, OS/400 to meetthe requirements of performance and scalability on the server without compromising thecross-platform portability of the rich language.Other technology included in the AS/400 Developer Kit for Java allows GUI applications to runon the system without modification. This support is called Remote Abstract Windowing Toolkit(AWT). It intercepts GUI requests coming from a Java program and re-routes the requests toan attached workstation running its own Java Virtual Machine (JVM). Server programs withgraphical interfaces for configuration or tuning run on the system without modification.Java objects on the iSeries servers can be full-fledged system objects that allow them to bepersistent, shared, secure, backed up, and restored. iSeries server single-level-storagetechnology permits Java objects to be stored in their object form without the performance andmaintenance overhead of two-level-store operating systems.Java Deployment Tools are aimed at simplifying the deployment, management, and tuning ofJava applications on the system. IBM has tested InstallShield's Java Edition product.InstallShield allows Java application developers to create packages that will install natively onthe iSeries server. This is the common method used to package and install applications onother platforms, such as Windows NT. InstallShield on the iSeries server makes it easier toport applications to the system that are currently targeted for other platforms. A number ofQshell enhancements and utilities are provided to support zip or unzip of Java packages. Toaid in performance analysis and tuning of Java applications on iSeries, support is provided toconvert data collected by Performance Explorer into standard formats used by popular Javaperformance analysis tools such as Javation and Hyperprof.Java applets and applications that access iSeries and programs and data from clientworkstations (or a Java-enabled server) can be written using the AS/400 Toolbox for Java.Java classes on the client can be used to access existing iSeries applications and data usinglow-level APIs. The AS/400 Toolbox for Java can be used on a client to access iSeriesservers running OS/400 V3R2, V3R7, or V4R1 and later. The ability to run Java applicationson the AS/400e requires OS/400 V4R2 or later and V4R5 on the iSeries. The Toolboxrequires Java Virtual Machine (JVM) 1.1.6 or later. At V4R4, the AS/400 Toolbox for Java wasenhanced to support the Java Database Connection (JDBC) 2.0 specification. SecureSockets Layer (SSL) specification enable support for data between the workstation andsystem to be encrypted and the server authenticated.
