# Re: JDK1.1.3 applet security exception

Seth White (Seth.White@Eng)
Fri, 22 Aug 1997 11:00:02 -0700

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    Date: Fri, 22 Aug 1997 11:00:02 -0700

    From: Seth.White@Eng (Seth White)

    Message-Id: <199708221800.LAA00676@managua.eng.sun.com>

    To: steven.j.blumfield@ac.com, mrm@Eng

    Subject: Re: JDK1.1.3 applet security exception

Steve,

Check the JDBC FAQ - http://java.sun.com/jdbc It discusses
this issue. Let me know if you have further questions.

Seth White,
JDBC group

> From mrm@shorter Fri Aug 22 10:52:24 1997
> To: steven.j.blumfield@ac.com
> CC: java-security@web2.javasoft.com, jdbc-odbc@wombat.eng.sun.com
> Subject: Re: JDK1.1.3 applet security exception
>
> Hi,
>
> Unfortunately we don't have an end-user support line. We do try to
> answer a representative sampling of email that comes in, but we
> actually get a lot of email, and it's difficult to answer them all.
>
> If you are using Microsoft software to connect to JDBC, perhaps MSFT
> has a support line with examples, and so on? (I don't know.) I
> myself have not tried to use the MS Access DB, so I am not an expert
> in debugging that configuration.
>
> Typically, however (as described on the SFAQ at
> http://java.sun.com/sfaq), downloaded applets are not allowed to
> instantiate packages in the sun.* or java.* namespace. (This is
> "loosely speaking".) I'm not sure why your code on line 56
>
> Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
>
> caused a security exception. That doesn't seem like a particularly
> intrusive access.
>
> What version of Java are you using? Are you using Microsoft's JVM?
>
> If this is an instance where the MSFT JVM doesn't allow you to
> instantiate a JDBC database, it could be for a couple reasons
>
> a) they don't have JDK 1.1 support in their JVM yet
>
> b) they have a bug in their JDBC support
>
> I'm just guessing here. I'm cc'ing the JDBC group, in case they have
> seen this problem.
>
> Marianne
>
> p.s. See also this web page for pointers to email addresses. I know
> that the Java engineers don't have time to answer all the questions
> that pour in on the aliases but we try to answer some of the
> questions.
>
> http://java.sun.com/mail/index.html
>
> > Cc: java-security <java-security@web2.javasoft.com>
> > From: "steven.j.blumfield" <steven.j.blumfield@ac.com>
> > Date: 21 Aug 97 17:01:21
> >
> > This is the preamble of an RFC-1341 encoded, mixed message.
> >
> > ---- next item ----
> > Content-Type: Text/Plain
> >
> > Hi again,
> >
> > I sent an email to you about a JDK1.1.2 security exception on 30 June. I never
> > received a response. I retried exec of this very basic applet with JDK1.1.3
> > yesterday and am getting a similar result. Please respond ASAP - the
> > attachments should not take more than a few minutes to check out!
> >
> > I developed an applet that includes connection to and access from an MS Access
> > DB on my local workstation. It didn't work. To test this further, I created a
> > simple applet "HelloAuto" (based on a sample from book "Learn Java Now") - see
> > attached. The offending line is:
> >
> > // load the jdbc-odbc driver
> > Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
> >
> > Compiling: "javac HelloAuto.java <Enter>" works OK.
> >
> > Exec: Appletviewer HelloAuto.html <Enter> produces the following in the
> > DOS window.
> >
> > Before try loop in init()
> > sun.applet.AppletSecurityException: checkpackageaccess
> > at
> > sun.applet.AppletSecurity.checkPackageAccess(AppletSecurity.java:628)
> > at
> > sun.applet.AppletClassLoader.LoadClass(AppletClassLoader.java:187)
> > at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)
> > at HelloAuto.init(HelloAuto.java:56)
> > at sun.applet.AppletPanel.run(AppletPanel.java:287)
> > at java.lang.Thread.run(Thread.java:474)
> > sun.applet.AppletSecurityException: checkpackageaccess
> > at
> > sun.applet.AppletSecurity.checkPackageAccess(AppletSecurity.java:628)
> > at
> > sun.applet.AppletClassLoader.LoadClass(AppletClassLoader.java:187)
> > at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)
> > at HelloAuto.init(HelloAuto.java:56)
> > at sun.applet.AppletPanel.run(AppletPanel.java:287)
> > at java.lang.Thread.run(Thread.java:474)
> > Failed:sun.applet.AppletSecurityException: checkpackageaccess
> >
> >
> > I would appreciate your feedback on this.
> >
> >
> >
> > Thanks and Regards,
> > Steve
> >
> >
> > ---- next item ----
> > Content-Type:Text/Plain; Name="HELLOA~1.JAV"
> >
> > //******************************************************************************
> > // HelloAuto.java: Applet
> > //
> > //******************************************************************************
> > import java.applet.*;
> > import java.awt.*;
> > import java.sql.*;
> > import java.util.*;
> >
> > //==============================================================================
> > // Main Class for applet HelloAuto
> > //
> > //==============================================================================
> > public class HelloAuto extends Applet
> > {
> >
> > // HelloAuto Class Constructor
> > //--------------------------------------------------------------------------
> > public HelloAuto()
> > {
> > // TODO: Add constructor code here
> > }
> >
> > // APPLET INFO SUPPORT:
> > // The getAppletInfo() method returns a string describing the applet's
> > // author, copyright date, or miscellaneous information.
> > //--------------------------------------------------------------------------
> > public String getAppletInfo()
> > {
> > return "Name: HelloAuto\r\n" +
> > "Author: Steve Blumfield";
> > }
> >
> >
> > // The init() method is called by the AWT when an applet is first loaded or
> > // reloaded. Override this method to perform whatever initialization your
> > // applet needs, such as initializing data structures, loading images or
> > // fonts, creating frame windows, setting the layout manager, or adding UI
> > // components.
> > //--------------------------------------------------------------------------
> > public void init()
> > { Connection dbConnection;
> > // If you use a ResourceWizard-generated "control creator" class to
> > // arrange controls in your applet, you may want to call its
> > // CreateControls() method from within this method. Remove the following
> > // call to resize() before adding the call to CreateControls();
> > // CreateControls() does its own resizing.
> > //----------------------------------------------------------------------
> > resize(320, 240);
> >
> > // Inserted the following to test connection to ODBC DB
> > System.out.println("Before try loop in init()");
> > try
> > {
> > // load the jdbc-odbc driver
> > Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
> > // System.out.println("Connecting to jdbc:odbc:" + DSN+","+UID+","+ PWD);
> > // make the connection to the supplied database
> > // dbConnection = DriverManager.getConnection("jdbc:odbc:" + DSN, UID, PWD);
> > }
> > catch (Exception e) {
> > System.out.println("Failed:"+e);
> > }
> >
> > }
> >
> >
> > // Place additional applet clean up code here. destroy() is called when
> > // when you applet is terminating and being unloaded.
> > //-------------------------------------------------------------------------
> > public void destroy()
> > {
> > // TODO: Place applet cleanup code here
> > }
> >
> > // HelloAuto Paint Handler
> > //--------------------------------------------------------------------------
> > public void paint(Graphics g)
> > {
> > g.drawString("Hello, World", 0, 20);
> > }
> >
> > // The start() method is called when the page containing the applet
> > // first appears on the screen. The AppletWizard's initial implementation
> > // of this method starts execution of the applet's thread.
> > //--------------------------------------------------------------------------
> > public void start()
> > {
> > // TODO: Place additional applet start code here
> > }
> >
> > // The stop() method is called when the page containing the applet is
> > // no longer on the screen. The AppletWizard's initial implementation of
> > // this method stops execution of the applet's thread.
> > //--------------------------------------------------------------------------
> > public void stop()
> > {
> > }
> >
> >
> >
> >
> > // TODO: Place additional applet code here
> >
> > }
> >
> >
> > ---- next item ----
> > Content-Type:Text/Plain; Name="HELLOA~1.HTM"
> >
> > <html>
> > <head>
> > <title>HelloAuto</title>
> > </head>
> > <body>
> > <hr>
> > <applet
> > code=HelloAuto.class
> > id=HelloAuto
> > width=320
> > height=240 >
> > </applet>
> > <hr>
> > <a href="HelloAuto.java">The source.</a>
> > </body>
> > </html>
> >
> >
> > ---- next item ------
> >
>
>
>

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