Ciao sto cercando di sviluppare sulla JDK di AS400 (1.4) ma quando lancio un semplicissimo JFrame mi esce ciö

> javac Finestra.java
$
> java Finestra
java.lang.Error: Could not find class: com.ibm.rawt2.ahost.java.awt.AHGraphicsEnvironment
java/lang/Throwable.<init>(Ljava/lang/StringV+4 (Throwable.java:85)
java/lang/Error.<init>(Ljava/lang/StringV+1 (Error.java:41)
java/awt/GraphicsEnvironment.getLocalGraphicsEnvironment()L java/awt/GraphicsEnvironment;+63 (GraphicsEnvironment.java:56)
java/awt/Window.<init>(Ljava/awt/GraphicsConfigurationV+74 (Window.java:183)
javax/swing/JFrame.<init>(Ljava/lang/StringV+1 (JFrame.java:167)
Finestra.main([Ljava/lang/StringV+0 (Finestra.java:7)

Secondo voi?