When the browser which is specified in the System Settings or JSP settings is 
deleted, an exception is thrown when selecting the System Settings or JSP 
objects in the Options window again.  The exception below was given after 
deleting the External Browser (Unix) object, but the case where it's more 
likely to happen is with External Browser (Command Line) since the user is 
given the ability to set up multiple command-line browsers.

Thu May 24 20:39:51 PDT 2001: java.lang.ClassNotFoundException: Services.Browser
s.UnixWebBrowser
java.lang.ClassNotFoundException: Services.Browsers.UnixWebBrowser
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at org.openide.execution.NbClassLoader.findClass(NbClassLoader.java:151)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
        at java.beans.Beans.instantiate(Beans.java:190)
        at java.beans.Beans.instantiate(Beans.java:51)
        at org.openide.loaders.InstanceSupport.instanceCreate(InstanceSupport.ja
va:179)
        at org.openide.loaders.InstanceDataObject$Ser.instanceCreate(InstanceDat
aObject.java:517)
        at org.netbeans.core.IDESettings.getWWWBrowser(IDESettings.java:315)
        at java.lang.reflect.Method.invoke(Native Method)
        at org.openide.nodes.PropertySupport$Reflection.getValue(PropertySupport
.java:187)
        at org.openide.explorer.propertysheet.PropertyDetails.getPropertyValue(P
ropertyDetails.java:142)
        at org.openide.explorer.propertysheet.PropertyValue.<init>(PropertyValue
.java:41)
        at org.openide.explorer.propertysheet.PropertySheet.refreshTab(PropertyS
heet.java:800)
        at org.openide.explorer.propertysheet.PropertySheet.setCurrentPage(Prope
rtySheet.java:498)
        at org.openide.explorer.propertysheet.PropertySheet.setCurrentPage(Prope
rtySheet.java:512)
        at org.openide.explorer.propertysheet.PropertySheet.refreshPropertySheet
(PropertySheet.java:658)
        at org.openide.explorer.propertysheet.PropertySheet.access$1500(Property
Sheet.java:68)
        at org.openide.explorer.propertysheet.PropertySheet$14.run(PropertySheet
.java:1228)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:154)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:331)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:134)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:101)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:96)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:88)