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><H1
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><A
NAME="AEN212"
></A
>3. Installing <SPAN
CLASS="application"
>Java</SPAN
></H1
><P
> Download the latest versions of the
<SPAN
CLASS="application"
>Java 2 Development Kit
(<SPAN
CLASS="acronym"
>JDK</SPAN
>)</SPAN
> or
<SPAN
CLASS="application"
>Run-time Engine
(<SPAN
CLASS="acronym"
>JRE</SPAN
>)</SPAN
>,
and the accompanying documentation from:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
> <A
HREF="http://java.sun.com/"
TARGET="_top"
>http://java.sun.com</A
>
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> Installation instructions and release notes for the
<SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>JDK</SPAN
></SPAN
> and
<SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>JRE</SPAN
></SPAN
>
are available at the download page.
</P
><P
> Make the binary distribution of the
<SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>JDK</SPAN
></SPAN
>
executable
and extract in a new directory:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
chmod +x jdk-xxx.bin
cd /usr/local/
.../jdk-xxx.bin
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> Install the <SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>JDK</SPAN
></SPAN
>
documentation
by unzipping it in the
<SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>JDK</SPAN
></SPAN
> directory:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
cd /usr/local/jdk-xxx/
unzip .../jdk-xxx-doc.zip
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> Change the ownership of the
<SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>JDK</SPAN
></SPAN
> directory
and make it available as
<TT
CLASS="filename"
>/usr/local/j2sdk/</TT
>:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
chown -R root:root /usr/local/jdk-xxx/
ln -s /usr/local/jdk-xxx /usr/local/j2sdk
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> If you need only the
<SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>JRE</SPAN
></SPAN
>,
the installation would be like this:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
chmod +x jre-xxx.bin
cd /usr/local/
.../jre-xxx.bin
chown -R root:root /usr/local/jre-xxx/
ln -s /usr/local/jre-xxx /usr/local/j2re
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> <DIV
CLASS="warning"
><P
></P
><TABLE
CLASS="warning"
WIDTH="100%"
BORDER="0"
><TR
><TD
WIDTH="25"
ALIGN="CENTER"
VALIGN="TOP"
><IMG
SRC="../images/warning.gif"
HSPACE="5"
ALT="Warning"></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> Using <SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>JDK</SPAN
></SPAN
>
version 1.5.0 caused
our <SPAN
CLASS="application"
>Tomcat</SPAN
> server
to crash every now and then:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
# SIGSEGV (0xb) at pc=0x4042db3f, pid=11991, tid=16386
#
# Java VM: Java HotSpot(TM) Server VM (1.5.0-b64 mixed mode)
# Problematic frame:
# V [libjvm.so+0x3abb3f]
#
</PRE
></FONT
></TD
></TR
></TABLE
>
Upgrading to version 1.5.0-01 seemed to solve these problems.
</P
></TD
></TR
></TABLE
></DIV
>
</P
><P
> <DIV
CLASS="note"
><P
></P
><TABLE
CLASS="note"
WIDTH="100%"
BORDER="0"
><TR
><TD
WIDTH="25"
ALIGN="CENTER"
VALIGN="TOP"
><IMG
SRC="../images/note.gif"
HSPACE="5"
ALT="Note"></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> For the (previously used)
<SPAN
CLASS="application"
>BlackDown Java for Linux distribution</SPAN
>:
</P
><P
> Find yourself a mirror for the
<SPAN
CLASS="application"
>BlackDown Java Development Kit</SPAN
>
at:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
> <A
HREF="http://www.blackdown.org/java-linux/mirrors.html"
TARGET="_top"
>http://www.blackdown.org/java-linux/mirrors.html</A
>
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> There you can download the latest versions of the
<SPAN
CLASS="application"
>J2 Software Development Kit (<SPAN
CLASS="acronym"
>SDK</SPAN
>)</SPAN
>
and
<SPAN
CLASS="application"
>Run-time Engine (<SPAN
CLASS="acronym"
>RE</SPAN
>)</SPAN
>.
</P
><P
> Make sure you pick out the right version for the
<SPAN
CLASS="systemitem"
>gcc</SPAN
> library installed on your system.
You can find out the version currently installed by typing:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
rpm -q libgcc
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> Installation instructions for the
<SPAN
CLASS="application"
>Java Development Kit</SPAN
>
are available as
<TT
CLASS="filename"
>INSTALL-j2sdk</TT
>
and <TT
CLASS="filename"
>INSTALL-j2re</TT
>.
</P
><P
> Make the binary distribution of the
<SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>SDK</SPAN
></SPAN
>
executable
and extract in a new directory:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
chmod +x j2sdk-xxx.bin
cd /usr/local/
.../j2sdk-xxx.bin
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> Change the ownership of the
<SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>J2SDK</SPAN
></SPAN
>
directory
and make it available as
<TT
CLASS="filename"
>/usr/local/j2sdk/</TT
>:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
chown -R root:root /usr/local/j2sdk-xxx/
ln -s /usr/local/j2sdk-xxx /usr/local/j2sdk
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> Do the same for the
<SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>RE</SPAN
></SPAN
>:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
chmod +x j2re-xxx.bin
cd /usr/local/
.../j2re-xxx.bin
chown -R root:root /usr/local/j2re-xxx/
ln -s /usr/local/j2re-xxx /usr/local/j2re
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
></TD
></TR
></TABLE
></DIV
>
</P
><P
> Since we didn't install the
<SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>JDK</SPAN
></SPAN
>
and <SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>JRE</SPAN
></SPAN
>
in our path,
we have to add the <TT
CLASS="filename"
>bin/</TT
> directories
to our <TT
CLASS="envar"
>$PATH</TT
> environment variable.
To make sure the <SPAN
CLASS="application"
>Java</SPAN
>
distributions and classes can be found,
we set the <TT
CLASS="envar"
>$JAVA_HOME</TT
>
and <TT
CLASS="envar"
>$CLASSPATH</TT
> variables as well.
</P
><P
> For the <SPAN
CLASS="application"
>Bourne shells</SPAN
>,
create a file <SPAN
CLASS="systemitem"
>/etc/profile.d/java.sh</SPAN
>:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
if ! echo ${PATH} | grep -q /usr/local/j2sdk/bin ; then
export PATH=/usr/local/j2sdk/bin:${PATH}
fi
if ! echo ${PATH} | grep -q /usr/local/j2re/bin ; then
export PATH=/usr/local/j2re/bin:${PATH}
fi
export JAVA_HOME=/usr/local/j2sdk
export CLASSPATH=.:/usr/local/j2sdk/lib/tools.jar:/usr/local/j2re/lib/rt.jar
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> Set its ownership and access rights:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
chown root:root /etc/profile.d/java.sh
chmod 755 /etc/profile.d/java.sh
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> Do the same for <SPAN
CLASS="application"
>C shells</SPAN
>,
by creating the file
<SPAN
CLASS="systemitem"
>/etc/profile.d/java.csh</SPAN
>:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
if ( "${path}" !~ */usr/local/j2sdk/bin* ) then
set path = ( /usr/local/j2sdk/bin $path )
endif
if ( "${path}" !~ */usr/local/j2re/bin* ) then
set path = ( /usr/local/j2re/bin $path )
endif
setenv JAVA_HOME /usr/local/j2sdk
setenv CLASSPATH .:/usr/local/j2sdk/lib/tools.jar:/usr/local/j2re/lib/rt.jar
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> and setting its ownership and access rights:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
chown root:root /etc/profile.d/java.csh
chmod 755 /etc/profile.d/java.csh
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> Now the <SPAN
CLASS="application"
><SPAN
CLASS="acronym"
>JDK</SPAN
></SPAN
>
should be available to everyone on your system.
</P
><P
> <DIV
CLASS="tip"
><P
></P
><TABLE
CLASS="tip"
WIDTH="100%"
BORDER="0"
><TR
><TD
WIDTH="25"
ALIGN="CENTER"
VALIGN="TOP"
><IMG
SRC="../images/tip.gif"
HSPACE="5"
ALT="Tip"></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> You can test the <SPAN
CLASS="application"
>Java</SPAN
> engine
by typing:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
java -version
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> or create a file <TT
CLASS="filename"
>Test.java</TT
>:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
public class Test {
public static void main(String[] args) {
System.out.println("Hello world");
}
}
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> and test the compiler:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>
javac Test.java
java Test
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
></TD
></TR
></TABLE
></DIV
>
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