INTRODUCTION

JWeb is a point-and-click interface for display and interaction with SPIDER images and data written by Dr. Bimal Rath. JWeb is written in Java was developed and tested on Linux, SGi Irix & Windows computers.

LOADING JWeb
(Probably has already been done if you have installed SPIDERweb or Web)

1. Download and uncompress the Web distribution and place it in an appropriate directory: PARENT-DIR.

   The following JWeb related files will be created under: PARENT-DIR/web/jweb

   File	Contents
   src	Jweb source code
   WEB.jar	Linux Jweb Java archive
   jweb-inst-linux.html	Linux Jweb Java archive
   jweb.cshrc	Jweb 'C' shell env. variables

INSTALLATION

Most Linux distributions install a Java Run Time Environment (JRE) by default. If the Java Advanced Imaging Run Time Environment (JAI) is not already present you can install a second JRE containing JAI as described in the an earlier web release: v26-04 . Since this release is large it is no longer included. You may extract the java-libraries from: v26-04 and place them in your current Jweb directory.

If so the Jweb directory will have the additional contents:

File	Contents
java-libraries/font.properties	Linux Jweb fonts
java-libraries/j2re-1_4_2_06-linux-i586.bin	JRE install script
java-libraries/j2re1.4.3_06	JAI install script
java-libraries/jai-1_1_2_06-lib-linux-i586-jre.bin	JAI install script

1. To install the ancient JRE and JAI:

   1. Access your Jweb directory:
      cd web/jweb/java-libraries/
   2. Install the JRE included with JWeb by executing:
      j2re-1_4_2_06-linux-i586.bin
      
   3. Install JAI in the new Java directory:
      cd j2re1.4.2_06
      ../jai-1_1_2_01-lib-linux-i586-jre.bin
      
   4. Return to the Jweb directory:
      cd ..
      

1. Set necessary environment variables and alias for Jweb usage under Java.
   If you are using the 'C' shell, edit the first non-comment line in: jweb.cshrc and create a $JWEB_DIR environment variable specifying location for JWeb on your system i.e.:
   setenv   JWEB_DIR   Enter_path_of_your_JWeb_directory_here
   Then place the edited contents of jweb.cshrc in the .cshrc startup file in your home directory .
   
2. The previous step will also create alias, 'jweb', for starting JWeb with a maximum amount -Xmx512m of memory allowed. You may adjust this amount to suit your computer.
   
3. If you are not using a 'C' shell then you will have to alter the last two steps as appropriate for your shell.

TESTING

Test JWeb :

jweb

USE MOUSE TO SELECT MENU ITEMS FROM PULL-DOWN MENUS

Further information on the use of JWeb is given in the JWeb manual.

If you get an error message like: Exception in thread "GtkMain" java.lang.UnsatisfiedLinkError: gtkInit ... ....

You are not using the Java run time environment packaged with JWeb. Unknown error.