Hi, Fran:
Is your file on the local machine or a remote server? Applet can't
read/write file on a remote machine unless you sign your applet.
Read the email the Ernest sent to us before maybe helpful.
Subject:
Re: JESS: applet and security
Date:
Fri, 6 Aug 1999 06:45:55 -0700 (PDT)
From:
"Ernest Friedman-Hill" <[EMAIL PROTECTED]>
To:
<[EMAIL PROTECTED]>
CC:
<[EMAIL PROTECTED]>
Hi,
None of Jess's defclass/definstance/new/call/get-member functions will
work in unsigned applets. As the exception says, Netscape considers
the Java Reflection API Jess is using to be a security problem.
I will say this one more time:
*** Don't use Applets. ***
*** Applets are only good for dancing elf animations. ***
*** Use Jess on the server side, perhaps in a servlet. ***
It is exceedingly likely that Jess 5.0 final will come with a servlet
example but -without- an applet example.
If you absolutely must use Jess in an applet, you're going to need to
use digital signatures. Here's a web page with a lot of good info
about this process:
http://www.suitable.com/Doc_CodeSigning.shtml
I think Fang Liu wrote:
>
> Hi, jess-users:
>
> I am having a problem with applet and security. What I want to do is to
> create an object inside an applet and I can later on use the object as a
> fact or template to fire some rules. However, I can not do it. I got
> stuck with "defclass" (see the following code). What did I do wrong? I
> need some help here. Any comments are appreciated.
>
> By the way, I already added all the userpackages for the rete engine to
> avoid any "function not implemented" error .
>
> ...
> rete.executeCommand("(store Mytank (new jess.examples.pumps.Tank
> \"MMM\"))");
> rete.executeCommand("(printout t (fetch Mytank) crlf crlf)");
> rete.executeCommand("(defclass mytank
> jess.examples.pumps.Tank)");
>
> rete.executeCommand("(definstance mytank (fetch Mytank))");
> ...
>
> The following is the error message in Netscape 4.51 java
> console:
>
>
> Tank MMM level now 495
> <External-Address:jess.examples.pumps.Tank>
>
> netscape.security.AppletSecurityException: security.member access at
> netscape.security.AppletSecurity.checkMemberAccess(AppletSecurity.java:1155)
> at
> netscape.security.AppletSecurity.checkMemberAccess(AppletSecurity.java:1143)
> at java.lang.Class.checkMemberAccess(Class.java:698)
> at java.lang.Class.getDeclaredMethods(Class.java:555)
> at java.beans.Introspector.getTargetEventInfo(Introspector.java:444)
> at java.beans.Introspector.getBeanInfo(Introspector.java:200)
> at java.beans.Introspector.getBeanInfo(Introspector.java:83)
> at java.beans.Introspector.<init>(Introspector.java:178)
> at java.beans.Introspector.getBeanInfo(Introspector.java:83)
> at jess.reflect.Defclass.call(ReflectFunctions.java:869)
> at jess.Funcall.simpleExecute(Funcall.java:336)
> at jess.Funcall.execute(Funcall.java:297)
> at jess.Funcall.execute(Funcall.java:196)
> at jess.Jesp.parseAndExecuteFuncall(Jesp.java:1386)
> at jess.Jesp.parseSexp(Jesp.java:161)
> at jess.Jesp.parse(Jesp.java:61)
> at jess.Rete.executeCommand(Rete.java:1091)
> ....
> Thanks.
>
> Fang Liu
Regards,
Fang Liu
Fran / Carmen wrote:
>
> Problem with batch function
> I'm calling JESS functions from Java applet using fetch and store, the
> program works without problem using the JDK but when I try to open the
> HTML page from Explorer appear this error:
>
> exception: com.ms.security.SecurityExeptionEx[jess/Batch.call]:
> cannot access file name.clp
>
> it's not a path problem (I'm using Internet Explorer ver 5).
>
> Thaks
> Fran
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