isn't FCKeditor compatible with Java 1.3.x ?

Hi all,

i have try to deploy FCKeditor Java integration in Websphere portal server and i have this error :
"java.lang.String: method replaceAll(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String; not found"
=> the method 'replaceAll' of 'String' doesn't exist before Java 1.4.
And i'm on Java 1.3...

=> Exist there a version of the library for Java 1.4 ?

thanks...