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I'll attempt to answer a few questions. I'm not familiar with the long startup time of Tomcat.You can create native Java program objects on OS/400 with the CRTJVAPGM command.
Change the optimization level. It is *INTERPRET by default. You can run graphical applications using NAWT on OS/400 but it is not easy.Below are some notes I have on this. We never tried it but it may give you a place to start.
NAWT relies upon the X Window System for its graphics engine. The recommended X Window graphics server for this release is Virtual Network Computing (VNC), which runs under OS/400 Portable Application Solutions Environment (PASE). PASE is a UNIX-like environment capable of running most binary executables compiled for IBM's AIX operating system. VNC is a product of AT&T Research Labs, and provides a virtual X Window server; that is, an X server that does not require a directly attached graphics-capable display device.
I've never heard of anyone using OS/400 as a development platform. I've never found Java applications to be resource-intensive on OS/400. Of course a badly written application could cause problems. I am familiar with 2 JDBC drivers for DB2/400:1) com.ibm.db2.jdbc.app.DB2Driver -> Use this when running a Java application locally on an iSeries (AS/400) machine 2) com.ibm.as400.access.AS400JDBCDriver -> Use this driver when accessing a remote iSeries (AS/400) system
I hope this helps. Todd At 02:02 PM 9/19/2005, Thorbjørn Ravn Andersen wrote:
I am an experienced Javaprogrammer with Windows+Unix experience who have now for a while worked with creating frontends for OS/400 backbone calls using Eclipse on Win32.Just for fun I tried installing and running Tomcat 5.0.30 beta the other day, with the intent of eventually porting our webapps to run natively on OS/400, but we are very careful since that is very new to us all.The sample JSP's and servlets was impressively quick!I would therefore like to hear if there is experience in this forum regarding the following:* The long startup time of Tomcat (50 seconds) is due to some precompilation to native code? * Can I use graphical applications (Swing) on OS/400 and use some software on Win32/Unix to see the output. X Windows perhaps?* I have seen that some corners of eclipse.org mention OS/400 binaries, but not for the native Eclipse application. Is this available, or is it perhaps some Websphere package? How do I access that (i.e. what am I to ask the system responsible) :) Would Netbeans run?* Do anyone use Java on OS/400 as a development platform, or is it solely for deploying applications?* I found the qsh interface rather sluggish to work with. Can I ssh to OS/400 instead and perhaps get a more responsive shell?* What is the resource usage of Java programs under OS/400? How can I tell for myself? It is very important that we can determine accurately if this is a feasible path.* Do anyone have performance numbers of JDBC-access using the best driver when running on OS/400? We may have a very data processing intensive application where network performance may be a bottleneck if running on another host.Any other suggestions, including further reading, would be appreciated. Thanks in advance for any pointers. Best regards, Thorbjørn Ravn Andersen
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