You can run the Windows version of Sun HotSpot JVM under sanos. This is possible because sanos supports the standard PE executable format (.EXE and .DLL files). Wrappers are provided for the Win32 DLLs like kernel32.dll, user32.dll, wsock32.dll, etc., as well as the C runtime library msvcrt.dll. I have tested sanos with the following JVMs:
As a demonstration of running a java server application under sanos I have made an installation image with sanos, HotSpot JVM and Tomcat web server.
The easiest way to try it is to download and unzip the live CD ISO image. You can burn this image to a CD-ROM using your favorite CD-burner program and then boot the computer from the CD-ROM. You can also try it out using VMware by setting the sjt-livecd.iso as the ISO image for the CD-ROM device.
When you boot from the CD-ROM sanos will startup and run Tomcat in the JVM. Please ignore the java.io.FileNotFound exceptions during startup. Tomcat wants to write to the conf directory, but this is a no-go on a CD-ROM. Type more /proc/netif in the shell to find the IP assigned to sanos. The live CD uses DHCP to get an IP address (in this example 192.168.123.5).
You are now ready to try the tomcat server. Point you browser to http://192.168.123.5 and the standard Tomcat homepage should be shown. You can browse the sanos file system by navigating to http://192.168.123.5/files. Please notice that the Live CD configuration is not a "secure" configuration and should only be used for demo purposes. The file system is exposed in the browser. Also, the shell is listening on the telnet port and it does not require any password to login.
You can also install the sanos-java-tomcat example on your hard disk. If you want to try it on VMware:
setup /usr/install/setup.ini. This will format the hard disk and install the necessary files.
NB: There is an error in the setup script. You have to copy the shell (sh.exe) manually to the hard disk. You can boot on the CD-ROM image and copy the shell manually:
mount hd0a /mnt cp /usr/bin/sh.exe /mnt/bin/sh.exe umount /mnt
You can test the installation by pointing your browser at
http://<ipaddr>. This should
show you the default tomcat start page. If you want to browse the files on the
sanos machine point your browser at
Let's look at how you configure sanos for running java applications. In the
/usr/java directory a standard Sun HotSpot Java VM for Windows is
installed. These files are the same files as you use on you windows box for
running java programs. The tomcat web server is located in
The web applications are installed under
your web application as a
.war file and place it in this directory.
How does sanos know which java application to run? This is configured in
# # os.ini # [os] libpath=c:\bin init=c:\bin\jinit.exe [netif] eth0 [java] jvm=c:\usr\java\bin\hotspot\jvm.dll mainclass=org.apache.tomcat.startup.Tomcat [java.options] -Xmx32M [java.properties] user.timezone=Europe/Copenhagen tomcat.home=c:\usr\tomcat [java.classpaths] c:\usr\java\lib\tools.jar c:\usr\tomcat\lib\webserver.jar c:\usr\tomcat\lib\servlet.jar c:\usr\tomcat\lib\parser.jar c:\usr\tomcat\lib\jaxp.jar c:\usr\tomcat\lib\jasper.jar
[os] section you can see that
initpgm is set
jinit.exe program. This makes sanos run the
program when sanos has booted. The
jinit program is similar
java.exe under Windows except
jinit uses the
java.exe uses a
combination of the registry, the command line, the current directory and
environment variables to obtain startup and configuration parameters for the
jinit program looks in the
section for the location of the jvm and the main class for the java
application. If you want to pass command line arguments to the main
class add a
mainargs parameter to the
[java.options] section contains the parameters for the java
vm. In the
[java.properties] section you can specify system
properties for the application. These are the properties you normally
specify with the
-D option to
[java.classpath] section contains the jar files and directories
for your application.