• Subject: Re: Microsoft JVM and Toolbox
  • From: dawall@xxxxxxxxxx
  • Date: Mon, 25 Oct 1999 10:03:45 -0500

In this past, this error has been a classpath problem.  Browsers and jview ship
their own JVM.  These JVMs are not as 'complete' as IBM's and Sun's JVM in the
area of text conversion.  Specifically, they don't ship EBCDIC to/from unicode
conversion tables.  (Except for performance) this does not matter to the
Toolbox.  If the JVM does not supply a conversion table, the Toolbox gets it
from the AS/400.

The problem is when classes.zip from a Sun/IBM JVM is in the PC's classpath when
a browser or jview is started.  When the jvm cannot find a conversion table in
it's container of classes it starts searching the files in CLASSPATH.  If
classes.zip from a different JVM is in the classpath, it will find the table.
The problem is now "JVM" classes are coming from two different places.  Some are
coming from the browser or jview, others are coming from IBM/Sun classes.zip.
These two sets of classes are not compatible and you get an exception.  I have
some confidence that this is your problem.  I just ran a Toolbox testcase using
JView.  If classpath points only to jt400.jar, the test works.  If Sun/IBM
classes.zip are added to the classpath, the test fails with the exception you
report.  Remove classes.zip and give it a try.

David Wall
AS/400 Toolbox for Java

"Brad Grier" <grier@tconl.com> on 10/21/99 10:12:41 AM

Please respond to JAVA400-L@midrange.com

To:   JAVA400-L@midrange.com
Subject:  Microsoft JVM and Toolbox (For David Wall?)

When using Microsoft's JVM to run my application (via JVIEW), I get the
following stack trace. I'm using the latest V4R2M0 of the Toolbox (October
1999 build). I know an earlier poster mentioned this problem in regard to
applets and David Wall said the problem had been corrected. I'm using my own
sign-on dialog to pass the user id and password information into the
connection URL.

For earlier releases of the Toolbox I found a dubious workaround with the
help of a decompiler (and three new lines of code to the Toolbox ConvTable
class). I'd rather not have to resort to this to get my application to work
with JVIEW. Any ideas?


Brad Grier

java.lang.NoSuchFieldError: sun/io/ByteToCharSingleByte: field
byteToCharTable n
ot found
        at sun/io/ByteToCharCp037.<init>
        at java/lang/Class.newInstance
        at sun/io/ByteToCharConverter.getConverter
        at java/io/InputStreamReader.<init>
        at com/ibm/as400/access/ConvTable.<init>
        at com/ibm/as400/access/ConvTable.getTableNoSwapChars
        at com/ibm/as400/access/ConvTable.getTable
        at com/ibm/as400/access/Converter.<init>
        at com/ibm/as400/access/Converter.getConverter
        at com/ibm/as400/access/AS400.getSecurity400
        at com/ibm/as400/access/AS400.signOn
        at com/ibm/as400/access/AS400.connect
        at com/ibm/as400/access/AS400JDBCConnection.open
        at com/ibm/as400/access/AS400JDBCConnection.<init>
        at com/ibm/as400/access/AS400JDBCDriver.connect
        at java/sql/DriverManager.getConnection
        at java/sql/DriverManager.getConnection
        at com/linoma/surveyor/DBServer$MoleConnect.<init>
        at com/linoma/surveyor/DBServer.connect
        at com/linoma/surveyor/VDExplorer$7.construct
        at com/linoma/surveyor/SwingWorker$2.run
        at java/lang/Thread.run

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