Netscape 6 + JavaScript AccessControlException at file loading

Netscape 6 (Sun Java 1.3.0_01) does not let applets open http and file connection in methods called from JavaScript. If you press the Load button, Netscape may freeze. If you are lucky, then only the following exception is thrown:

java.security.AccessControlException: access denied (java.net.SocketPermission localhost resolve)
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:272)
    at java.security.AccessController.checkPermission(AccessController.java:399)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:545)
    at java.lang.SecurityManager.checkConnect(SecurityManager.java:1042)
    at sun.plugin.protocol.jdk12.http.HttpURLConnection.connectStep1(HttpURLConnection.java:170)
    at sun.plugin.protocol.jdk12.http.HttpURLConnection.getInputStream(HttpURLConnection.java:282)
    at Ns6JsACE.load(Ns6JsACE.java:24)
    at java.lang.reflect.Method.invoke(Native Method)
    at sun.plugin.liveconnect.PrivilegedCallMethodAction.run(SecureInvocation.java:564)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.plugin.liveconnect.SecureInvocation.CallMethod(SecureInvocation.java:273)
    at sun.plugin.navig.motif.AThread.handleRequest(Native Method)
    at sun.plugin.navig.motif.AThread.JNIHandleLoop(AThread.java:44)
    at sun.plugin.navig.motif.AThread.run(AThread.java:36)

Ns6JsACE.java

Workaround

The I/O connections should be opened in a separate thread that is created before the JavaScript calls, in applet init().

Ns6JsACEWorkaround.java