Trouble Shooting Page


Supported Web Browsers

Unlike other web-enabled chemistry databases WebReactions is a pure Java-based web application and therefore doesn't require the installation of any plug-ins. From the design it supports any operating system, provided there exists a working Java runtime environment (version 1.2 or newer). Typically it will be used through a web browser, but you may use the system without any browser at all. The list of working configurations contains, but is not limited to the following:

Suse Linux 8.2: Konquerer, Mozilla 1, Netscape 7, Opera 7

Red Hat Linux 9.0: Konquerer, Mozilla 1, Netscape 7, Opera 7

MacOS X: Safari, Mozilla, Netscape 7, Internet Explorer

Microsoft Windows 98, ME, NT, 2000, XP: Netscape 6 or 7, Mozilla 1, Opera 7.11, Internet Explorer 5

You may choose not to use a web browser at all and just run the WebReactions applet using Sun Microsystem's AppletViewer. This may be worthwhile if your web browser's Java implementation is not working correctly and you don't want to update it. Continue further down on this page for details.


What if you see an empty area instead of a structure editor

It seems that your browser does not support Java 1.2 or Java support is disabled. You may try first to enable Java in the browsers preferences or option dialog. In Netscape 6 or 7 and Mozilla 1.0 you find the appropriate setting in Edit->Preferences->Advanced->Enable Java.

In Internet Explorer 5 (Windows) it may be in Tools->Internet Options->Advanced->Java (Sun)->Use Java 2 v.... If this option is missing you need to install a proper JRE (see below), because the out-of-the-box support for 'Java' of Internet Explorer on Windows is not compatible with the Java specification. Anyway we recommend not to use Internet Explorer because Microsoft is a declared enemy of Java, current versions of Internet Explorer behave unstable running Java applets and future versions of Internet Explorer are likely to torpedo any Java plugins or other means of making Internet Explorer understand Java.

To our knowledge all web browsers on the Macintosh rely on the Java support of the operating system. The latest Java virtual machine available for MacOS 9 is MRJ 2.2.5 which does not yet support the needed Java 1.2 standard. Therefore MacOS 9 users cannot use WebReactions (please notify us if you find a workaround).


What if you see the applet but get an error 'RMI classes not found.'

You are likely to run a Microsoft version of Java that doesn't support RMI which is needed to communicate to the server. You should install an up-to-date Java Runtime Environment (see below).


Using Sun Microsystem's appletviewer

This is a simple, reliable and performant way of running WebReactions. You need to check whether you already jave a 'Java Development Kit' (JDK) installed ideally version 1.3 or 1.4. You may verify this

  • on Windows by opening a Command Prompt window

  • on Linux, MacOS X or other Unix by opening a new shell or console

and typing 'appletviewer http://www.webreactions.net/search.html'. As a result you should see a new window containing the WebReactions applet as it would appear within a browser. The only thing that's missing is the explanatory text that you see in a browser.

If the command appletviewer wasn't found or you get error messages containing ...Class 'JPanel' not found... you have either no or a too old JDK installed. In this case you find a current version as a free download at the Java download page. Select the newest available J2SE and then download the SDK for your platform.


Installing a Java Runtime Environment (JRE) for your browser

The JRE is a subset of the JDK described above. It does not contain any developer tools as appletviewer. However, it is the download of choice, if you intend to run Java applications or applets from within your web browser. For a free download go to the Java download page. Select the newest available J2SE and then download the JRE for your platform.