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<TITLE>Writing Advanced Applications, Chapter 7: Version Issues</TITLE>
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<H2>Writing Advanced Applications<BR>
<FONT SIZE="3">Chapter 7 Continued: Version Issues</FONT></H2>
<FONT SIZE="-1">[<A HREF="stack.html"><<BACK</A>] [<A HREF="index.html#contents">CONTENTS</A>] [<A HREF="perfTech.html">NEXT>></A>]</FONT></DIV>
<P>
This section provides a table that summarizes problems and solutions
related to having different versions of the Java<FONT SIZE="-2"><SUP>TM</SUP></FONT>
platform installed on your system.
<HR>
<TABLE BORDER="0" CELLPADDING="2">
<TR>
<TH ALIGN=LEFT><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Product</FONT></TH>
<TH><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Deployment</FONT></TH>
</TR>
<TR>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
JDK 1.0.2</FONT>
</TD>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
Uses <CODE>CLASSPATH</CODE> to find and load the
core system classes.
<P>
On Windows 95:<BR>
<CODE>CLASSPATH=/usr/java/lib/classes.zip:.</CODE>
<P>
On Unix:<BR>
<CODE>CLASSPATH=c:\java\lib\classes.zip</CODE>
<P>
Unix Dynamic libraries, <CODE>.dll</CODE> files, shared objects, and
<CODE>.so</CODE> files are located by the PATH variable.
<P>
<STRONG>Side Effects:</STRONG>
<BR>
The Win95 <CODE>Autoexec.bat</CODE> file contains an outdated
<CODE>CLASSPATH</CODE> variable set by a user or the installation of
other applications.
<P>
The WinNT User Environment contains an old <CODE>CLASSPATH</CODE> variable.
<P>
The Unix <CODE>.cshrc</CODE>, <CODE>.profile</CODE>, or <CODE>.login</CODE>
scripts contains wrong <CODE>CLASSPATH</CODE>.
<P>
The <CODE>JAVA_HOME</CODE> environment variable is also used by programs
so check this is not set. You can clear this field in the Bourne
shell (sh) as follows: <CODE>unset JAVA_HOME</CODE>
<P>
<STRONG>Diagnostics:</STRONG>
<BR>
Use the <CODE>-classpath</CODE> option to force the Java VM to
use the command-line.<CODE>CLASSPATH</CODE> only:
<CODE>java -classpath c:\java\lib\classes.zip;. myapp</CODE>
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<TH ALIGN=LEFT><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Product</FONT></TH>
<TH><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Deployment</FONT></TH>
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JDK 1.1</FONT>
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Uses relative paths to find the <CODE>classes.zip</CODE> file from
the Java platform installation. The <CODE>CLASSPATH</CODE> environment
variable is used to load application classes.
<P>
<STRONG>Side Effects:</STRONG>
<BR>
Other Java releases found on the application path might be picked up if
the new JDK <CODE>bin</CODE> directory is not explicitly set at the front
of the <CODE>PATH</CODE> environment variable.
<P>
<STRONG>Diagnostics:</STRONG>
<BR>
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