can't get idea-3273 to work on linux x86_64

I have been trying to get idea to work under x86_64 to no avail. Can someone please assist?

I'm using:
Idea Build 3273
Blackdown-1.4.2-01 JRE
KUbuntu & KDE 3.4. on 2.6.10-5-amd64-xeon kernel

It appears that the plugin manager is using a com.sun class (which is not found because I'm having to use the blackdown JRE -- only 1.4 jre available to my knowledge).

Here's an excerpt from the attached stack trace:
(ApplicationImpl.java:25) at com.intellij.openapi.application.ex.ApplicationManagerEx.createApplication(ApplicationManagerEx.java) at com.intellij.idea.IdeaApplication.(IdeaApplication.java:60) at com.intellij.idea.Main.a(Main.java:37) at com.intellij.idea.Main.access$000(Main.java:50) at com.intellij.idea.Main$2.proceed(Main.java:3) at com.intellij.ide.license.impl.IdeaLicense$1.proceed(IdeaLicense.java:5) at com.intellij.ide.license.policy.Proceed.check(Proceed.java:2) at com.intellij.ide.license.impl.LicenseAuthorizorImpl.checkPolicy(LicenseAuthorizorImpl.java:6) at com.intellij.ide.license.impl.LicenseAuthorizorImpl.checkPolicy(LicenseAuthorizorImpl.java:18) at com.intellij.ide.license.impl.IdeaLicense.startUp(IdeaLicense.java:45) at com.intellij.idea.Main.mainImpl(Main.java:5) at com.intellij.idea.Main.start(Main.java:40) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at com.intellij.ide.plugins.PluginManager$5.run(PluginManager.java:3) at java.lang.Thread.run(Thread.java:534) [ 3163] ERROR - llij.ide.plugins.PluginManager - java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at com.intellij.ide.plugins.PluginManager$5.run(PluginManager.java:3) at java.lang.Thread.run(Thread.java:534) ]]>