[rfc][icedtea-web] jnlpruntime.config changed to singleton

[Jiri Vanek]

Hi!

this simple patch is changing behaviour of jnlpruntime.config to be real singleton independent on 
rest of config.

The patch is pretty stright forward, except :


netx/net/sourceforge/jnlp/config/DeploymentConfiguration.java's

+    private ConfigurationException loadingException = null;
+
+    public void setLoadingException(ConfigurationException ex) {
+        loadingException = ex;
+    }
+
+    public ConfigurationException getLoadingException() {
+        return loadingException;
+    }




and its usage:

         if (isApplication && getConfiguration().getLoadingException() != null) {
                 JNLPRuntime.exit(1);
         }

For head, I'm thinking to not exit here, and continue with default runtime, and visible 
warning/exception


Also this pathc is simple enough that I'm inclined to backport it to 1.4...


J.
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