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Hi,
Although I can't help you in setting up a 1.1 environment, I can suggest
the following tip to narrow down which class is causing which class to
be loaded. If you run java with the "-verbose" flag it traces out each
class as it is loaded in turn. For example if you just run "java
-verbose" from the command line you get something like:
[D:\ade\gdavison_ct\modelers\src]java -verbose
[Opened d:\jdk\1.5\jre\lib\rt.jar]
[Opened d:\jdk\1.5\jre\lib\jsse.jar]
[Opened d:\jdk\1.5\jre\lib\jce.jar]
[Opened d:\jdk\1.5\jre\lib\charsets.jar]
[Loaded java.lang.Object from shared objects file]
[Loaded java.io.Serializable from shared objects file]
[Loaded java.lang.Comparable from shared objects file]
[Loaded java.lang.CharSequence from shared objects file]
[Loaded java.lang.String from shared objects file]
[Loaded java.lang.reflect.GenericDeclaration from shared objects file]
[Loaded java.lang.reflect.Type from shared objects file]
[Loaded java.lang.reflect.AnnotatedElement from shared objects file]
[Loaded java.lang.Class from shared objects file]
[Loaded java.lang.Cloneable from shared objects file]
[Loaded java.lang.ClassLoader from shared objects file]
[Loaded java.lang.System from shared objects file]
[Loaded java.lang.Throwable from shared objects file]
[Loaded java.lang.Error from shared objects file]
[Loaded java.lang.ThreadDeath from shared objects file]
[Loaded java.lang.Exception from shared objects file]
[Loaded java.lang.RuntimeException from shared objects file]
[Loaded java.security.ProtectionDomain from shared objects file]
[Loaded java.security.AccessControlContext from shared objects file]
[Loaded java.lang.ClassNotFoundException from shared objects file]
[Loaded java.lang.LinkageError from shared objects file]
[Loaded java.lang.NoClassDefFoundError from shared objects file]
[Loaded java.lang.ClassCastException from shared objects file]
[Loaded java.lang.ArrayStoreException from shared objects file]
[Loaded java.lang.VirtualMachineError from shared objects file]
So when running on something with swing involved you might see a line
such as:
[Loaded mypackage1.Application1 from ....]
...
[Loaded javax.swing.JFrame from shared objects file]
Knowing the order things are loaded can really help trace down such
problems. I regularly use this method to reduce the number of classes
loaded at program start up. Sometimes it only takes one object reference
to have hundreds of classes loaded. (For example swing)
Indirection is usually the way to go with these problems as you have
mentioned; but I figured you might be interested in this technique.
Regards,
Gerard
------------------------------
Message: 10
Date: Thu, 16 Dec 2004 20:54:05 -0800
From: David Linker <email@hidden>
Subject: Re: How do I debug "old interface" errors?
To: java dev <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset=US-ASCII; format=flowed
Thank you for the replies. I didn't want to lengthen my question by
details of my situation, but I see that it would help.
In reply to the many replies I have received:
The target is not just Mac OS, but also any other OS browser, with most
of the browsers being Windows. The problem is not theoretical. I wrote
the original version using Swing, and found that I was unable to run it
on a majority of example "target" machines. These are computers around
our hospital, and the goal is for the applet to be accessible from any
browser, at any hospital. At our hospital, the computer administrators
are very reluctant to install anything new, even a new JVM. Asking all
users to install software on their machine would raise the threshold
too high, in my opinion.
As a debugging tool, I wrote an applet to find out what VM was running
and whether there was Swing. I found all sorts of answers on the
hospital computers, with VM's ranging from 1.1.4 to 1.3.x. Some had
Swing, some did not.
I have tried to work around it using "indirection", as suggested. I
have made "wrapper" classes for each of the gui elements. Each wrapper
class instantiates either a Swing or an AWT element, depending on the
environment, and the behavior looks the same to the main application.
I am not including Swing class files in the applet.
My question was about trying to debug the problem. I can reproduce it
easily by running it in IE, but not within XCode. Therein lies the rub!
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