CLASSPATH & JAVA_HOME

Does anyone know where Windows store enviroment CLASSPATH & JAVA_HOME?

In the registry. To edit, open the Control Panel and
double click the System icon. Then on the Advanced tab
choose Environment Variables...Ok, but how can I set them up using JAVA? Like "CLASSPATH=d:\java_1.3.1\"

Similar Messages

Environment variables like classpath,JAVA_HOME,path

Sir,
I work as a java developer in a software company.I had more problems when executing servlets."could not create the java vitual machine" error comes when i try to compile java servlet file.also I do not know that how to set environment variables like classpath,path and JAVA_HOME.Also I want to know them with proper examples.
Thanking you.
KRamesh

Hi Teches
I am facing few problem in starting eclipse 3.0 ; I had gone trogh forum , 1 of the persone suggest me to upgrade the java version.For this
I had installed java 1.5 and set the following variable
JAVA_HOME ---> to the home dir of JAVA
PATH ---><home dir>/bin
CLASSPATH --><jre>/lib
But when ever i m giving "java -version" command on console , the result is as follows:
C:\>java -version
java version "1.3.1_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_01)
Java HotSpot(TM) Client VM (build 1.3.1_01, mixed mode)
suggestion are welcome Plz.
;

Configure Path/CLASSPATH/JAVA_HOME/TOMCAT_HOME

hi all. iM sorry mayb this topic has been posted several times. But iM still encountering some problems here might need the experts help out there. What i did initially was to open up the autoexec.bat files(iM using win98) and added this lines:
set CLASSPATH=C:\xerces-1_4_4\xerces.jar;C:\soap-2_2;C:\soap-2_2\lib\soap.jar;C:\jaf-1.0.1\activation.jar;C:\javamail-1.2\mail.jar;.;C:\jdk1.3.1\lib;C:\jdk1.3.1\lib\tools.jar;C:\jdk1.3.1\jre\lib;C:\tutorial\demo1;C:\tutorial\demo2;C:\tutorial\demo3;C:\jsse1.0.2\lib\jsse.jar;C:\jsse1.0.2\lib\jnet.jar;C:\jees1.0.2\lib\jcert.jar;C:\rhino\js.jar;C:\jakarta-tomcat-3.2.3\lib\servlet.jar;
PATH %PATH%;.;C:\jdk1.3.1\bin;C:\jakarta-tomcat-3.2.3\bin;C:\Winnt\System32;
SET JAVA_HOME=C:\jdk1.3.1
SET TOMCAT_HOME=C:\jakarta-tomcat-3.2.3
Ok... when i tried to run tomcat on the MSDOS command they said that "Out of environment space" and "check the value of TOMCAT_HOME" Help appreciated...

You need to allocate more space to the DOS environment. How this is done varies by OS. Here's results of a forum search that probably has the information specific to your system.
http://search.java.sun.com/search/java/index.jsp?qp=&nh=100&qt=%2Bdos+%2B%22environment+size%22+-%22Replies%3A+0%22&col=javaforums&x=33&y=8
Fixing the space problem will probably resolve the Tomcat Home error, it's probably due to insufficient environment space.

Classpath, weblogic.class.path, server's class path, javaclasspath, serverclasspath ?? confused

When I type t3config , I see a couple of class paths and I'm confused which
one is which and
what are the diffrences between them, there is classpath, javaclasspath,
serverclasspath, weblogic.class.path
and JVM class path, Server's class path on the weblogic console window.
any clearification is appreciated.
thanks,
CLASSPATH Prefix
CLASSPATH
JAVA_HOME
WEBLOGIC_LICENSEDIR
WEBLOGIC_HOME
system properties
weblogic.class.path
INITIAL HEAP
MAX HEAP
SERVERCLASSPATH

Why would you do that - same class in both class paths? Don't.
Don't put any application classes in the system
classpath (JAVACLASSPATH).
Mike
Dimitri Rakitine <[email protected]> wrote:
http://www.weblogic.com/docs51/classdocs/API_ejb/EJB_deployover.html#1056256
Tony Lu <[email protected]> wrote:
Can someone tell me how does weblogic use the weblogic.class.path? what's
the relation between weblogic.class.path and systemclasspth ? if I have 2
different classes ( same name but different ) on bothpath, which one would
be loaded ? the one in classpath or the one in weblogic.class.path?
Dimitri

Urgent : How to include Win2K CLASSPATH to Tomcat 4.2

I am running a web application on Tomcat 4.1
Tomcat 4.1 uses CATALINA_HOME and JAVA_HOME
enviroment variables and from my knowledge of the settings
it does not utilise the Win2K CLASSPATH variable.
I use a number of *.properties files to access values and variables
so I need to set the startup program of Tomcat to include CLASSPATH.
Is this possible ?
Secondly is there any other way of making the web application recognise
these property files .
Based on some suggestions I tried including the files with classes
and adding a zip file.
It works fine with Tomcat 3.2.4 as it includes CLASSPATH on startup.
Could anyone suggest the solution for this as I searched the Tomcat websites and could not find a solution.
Thanks
manosham

I looked at the Tomcat 4 startup file and it looks like it overwrites CLASSPATH in the bin/setclasspath.bat file. You can get around that by modifying that file. Look for this line near the end:
set CLASSPATH=%JAVA_HOME%\lib\tools.jar... and change it to ...
set CLASSPATH=%JAVA_HOME%\lib\tools.jar;%CLASSPATH%Hope that helps :)

Classpath for J2SDK 1.4.1

Hello,
I'm a beginner to Java and I'm using Mandrake Linux 9.0 and J2SDK 1.4.1. I would like to ask how to set the class path for the SDK? Meanwhile, I always get this error message when compilering a java file that uses class packages.(i.e. javax.swing.JOptionPane)
Some of the error:
===
$ javac DemoPaint.java
DemoPaint.java:4: error:Cannot find class "JApplet" [JLS 8]
$
===
$ javac Lab4_1.java
Lab4_1.java:1: error:Import of type "javax/swing/JOptionPane" from unamed package [JLS 7.6]
Lab4_1.java:1: error:Cannot find class "javax/swing/JOptionPane" [JLS 8]
$
===
Thank you!
Charles Cheng

If did you set correct CLASSPATH?
CLASSPATH="$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/too
s.jar:."Don't do that. In general, never put JDK jars into
your classpath. Let the Java VM find it by itself -
they all do.
Make sure that Mandrake is not shipping with Kaffe or
any such silly VM (RedHat used to do this -
/usr/bin/java was Kaffe!).
Check your $PATH, and make sure that
/usr/java/j2sdk1.4.1_01/bin is in your PATH before
/usr/bin, and that that is the Java that is picked
up:
$ java -version
java version "1.4.1_01"
Java(TM) 2 Runtime Environment, Standard Edition
(build 1.4.1_01-b01)
Java HotSpot(TM) Client VM (build 1.4.1_01-b01, mixed
mode)If you see this output, you should be OK.
Once again, do NOT put any standard Java jars into
your CLASSPATH!.A PROBLEM
After I removed JDK jars from CLASSPATH, my jikes cannot work. It tell me cannot find java.util.........

Linux-Java Classpath

I'm not new to Java, just new to Java in Linux. I installed the 1.3.1 jdk, but any time I try to compile or run something, I always get the same error:
Couldn't find or load essential class `java.lang.Object' java.lang.NoClassDefFoundError java/lang/Object
I figure it's because I don't have my CLASSPATH set, but I don't know how to do that or what to set it to. Please help!
MagiTom

Hi
Most Linux machine's use bash as their shell, so you can try editing your ".bashrc" file which lies in the root of your profile directory (normally it would be something like "/home/username"
If you want to make the changes for all users that log onto the machine you've got a couple of options - you can edit the ".profile" file under "/etc" , or you can run a script at a certain run-level; I normally choose run-level 3. OK, this last bit might sound like Greek to you, but it's also easy - have a look under "/etc" you'll find a dir called "rc.d" under that you'll find various dirs called "rc1.d", "rc2.d" etc; every dir contains scripts that execute when a certain run-level is reached. You can then just add a script that loads your environmental variables.
Below is an example of how you could set you're environment variables in your ".bashrc" file:
JAVA_HOME=/usr/lib/jdk1.3.1
export JAVA_HOME
TOMCAT_HOME=/opt/jakarta
export TOMCAT_HOME
PATH=/usr/lib/jdk1.3.1/bin:$PATH
export PATH
CLASSPATH=$JAVA_HOME/lib/tools.jar:.:/usr/lib/j2sdkee1.2.1/lib/j2ee.jar
export CLASSPATH
As you can see I set a number of variables - but that's just because I do a bit of J2EE dev every now and again
Hope this helps - and welcome to the world of Linux!!!!!

Setting Path,Classpath in Mandrake 8.2

I have added the following lines to the .bashrc .bash_profile for my regular user
and /etc/profile and i still cannot find the java path with a regular user but using root i can
Shouldn't the /etc/profile allow all users to access the java directory?
export JAVA_HOME=/usr/local/j2sdk1.4.0/
export PATH=$PATH:$JAVA_HOME/bin/
export CLASSPATH=$JAVA_HOME/lib/
Thanks

I'm in the same boat as you are. Did you ever get the java working??

Help classpath problem j2sdk1.4.2_04

help classpath problem j2sdk1.4.2_04
how can i run the java program with specify the file location
such as :
-----this one is fine ok and return HelloWorld.class-----
[root@localhost root]javac /serverData/studentAC/s001/HelloWorld.java
-----but this one cause exception-----
[root@localhost root]java /serverData/studentAC/s001/HelloWorld
-----result-----
Exception in thred "main" java.lang.NoClassDefFoundError: /serverData/studentAC/s001/HelloWorld
[root@localhost root]
I have tried a lot of classpath setting:
I just want to compile and run the java program without specify the classpath only !! please help !!! and give suggest !! if you have this exp!!
# ---1
#PATH=/usr/java/j2sdk1.4.2_04/bin:$PATH:$HOME/bin:./
#export PATH
#export JAVA_HOME=/usr/java/j2sdk1.4.2_04/
#export #CLASSPATH=/usr/java/j2sdk1.4.2_04/lib/tools.jar:/usr/java/j2sdk1.4.2_04/jre/lib/rt.jar:./
# ---2
#set java environment
# Java Setup Section START
export JAVA_HOME="/usr/java/j2sdk1.4.2_04"
export JRE="$JAVA_HOME/jre"
export CLASSPATH="$JAVA_HOME/lib:$JRE/lib:$JAVA_HOME/lib/tools.jar:."
export PATH="$PATH:$JAVA_HOME/bin"
# Java Setup Section END
# ---3
#PATH=$PATH:/usr/java/j2sdk1.4.2_04/bin
#JAVA_HOME=/usr/java/j2sdk1.4.2_04/
#export PATH
# ---4
# Java Setup Section START
#JAVA_HOME=/usr/java/j2sdk1.4.2_04
#export JAVA_HOME
#CLASSPATH=$CLASSPATH:/usr/java/j2sdk1.4.2_04/lib:/usr/java/j2sdk1.4.2_04/jre/lib:./
#export CLASSPATH
#PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/bin
#export PATH
# Java Setup Section END
# ---5
#export PATH=$PATH:/usr/java/j2sdk1.4.2_04/bin
#export JAVA_HOME=/usr/java/j2sdk1.4.2_04
#export CLASSPATH=/usr/java/j2sdk1.4.2_04/lib:$CLASSPATH:.
# ---6
#====================================================
#export JAVA_HOME=/usr/java/j2sdk1.4.2_04
#export PATH=$JAVA_HOME/bin:$PATH
#export CLASSPATH=/usr/java/j2sdk1.4.2_04/lib:$CLASSPATH
#====================================================

I think this will work. java -classpath /serverData/studentAC/s001 HelloWorld

Java - linux Classpath

Hi I am new to Linux classpath. I am using Fedora Core 5 which comes along with jdk1.4.2. I read one of the messages that are posted in another form and set the classpath in the linux in the /etc/profiles folder. The below code I added over there:
JAVA_HOME=/usr/java/jdk1.5.0_08
export JAVA_HOME
PATH=$PATH:$JAVA_HOME/bin
CLASSPATH=$CLASSPATH:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/htmlconverter.jar:$JAVA_HOME/lib/jconsole.jar
export PATH CLASSPATH
Now when i run javac -version it is showing the below output.
javac 1.5.0_08
javac: no source files
But when I run java -version it is showing me the below output.
java version "1.4.2"
gij (GNU libgcj) version 4.1.1 20060525 (Red Hat 4.1.1-1)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
I don't understand what mistake I am doing. Please guide me and i would like to know how it is showing 1.5 for javac version and 1.4.2 for java version.
Thanks in advance.
Srikanth

This has nothing to do with the classpath and all to do with the PATH.
Somewhere, you have a 1.4.2 JRE in the PATH, before the 1.5.0 JDK and it's JRE.
So if you call javac, it will execute 1.5.0's because the 1.4.2 JRE doesn't have it, but java will be 1.4.2's because that the first one it'll find.

DASE Linux - Java CLASSPATH

Folks,
I have set java path in /etc/profile.d as java.sh, following are it's content -
#!/bin/bash
JAVA_HOME=/usr/java/jdk1.2.2
JMF_HOME=/usr/java/JMF1.1
LD_LIBRARY_PATH=/usr/java/jdk1.2.2/jre/lib/i386
PATH=$JAVA_HOME/bin:$JMF_HOME/bin:$LD_LIBRARY_PATH/bin:$PATH
export PATH JAVA_HOME JAVA_JMF LD_LIBRARY_PATH
#export CLASSPATH=.
I have checked following things for java path - which javac, it's works and also in
path where I am suppose to do ./configure, it's works.
After doing make 2>&1 | tee log.mks I get following errors -
Exception in thread "main" java.lang.NoClassDefFoundError: tools/simulation/DataGen
make[1]: *** [test] Error 1
make[1]: Leaving directory `/home/DASE/nist_ri/devkit'
make: *** [make-install] Error 1
I presume, that somehow there is an issue for setting the java CLASSPATH. My classpath
has all jar files as asked in NIST DASE document - devkit.jar, stb.jar, dase.jar & libjreX.so.
I would appreciate if I can get some clue to resolve above issues.
Regards,
Mukesh K Srivastava

Hi
Most Linux machine's use bash as their shell, so you can try editing your ".bashrc" file which lies in the root of your profile directory (normally it would be something like "/home/username"
If you want to make the changes for all users that log onto the machine you've got a couple of options - you can edit the ".profile" file under "/etc" , or you can run a script at a certain run-level; I normally choose run-level 3. OK, this last bit might sound like Greek to you, but it's also easy - have a look under "/etc" you'll find a dir called "rc.d" under that you'll find various dirs called "rc1.d", "rc2.d" etc; every dir contains scripts that execute when a certain run-level is reached. You can then just add a script that loads your environmental variables.
Below is an example of how you could set you're environment variables in your ".bashrc" file:
JAVA_HOME=/usr/lib/jdk1.3.1
export JAVA_HOME
TOMCAT_HOME=/opt/jakarta
export TOMCAT_HOME
PATH=/usr/lib/jdk1.3.1/bin:$PATH
export PATH
CLASSPATH=$JAVA_HOME/lib/tools.jar:.:/usr/lib/j2sdkee1.2.1/lib/j2ee.jar
export CLASSPATH
As you can see I set a number of variables - but that's just because I do a bit of J2EE dev every now and again
Hope this helps - and welcome to the world of Linux!!!!!

Error while running a jsp page : "jasper run time error"

hii
I'm facing trouble while running some jsp page . the error is as follows:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
     org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:97)
     org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:346)
     org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:414)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK
     org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.getCompiler(CompilerAdapterFactory.java:106)
     org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:935)
     org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:764)
     org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:382)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
Apache Tomcat/5.0.28
The set up in my system (path set up is as follows):
Catalina home: C:\ apache software foundation\Tomcat 5.0
Classpath: %java_home%;C:\j2sdk1.4.2_03\bin;
Javahome: C:\ j2sdk1.4.2_03\jre;
path: C:\ j2sdk1.4.2_03\bin
<there are other variables available in path, along with that I have added the j2sdk1.4.2_03\bin in path".
So if u have any way out for it please let me know.

I think you only need to add: c:\j2sdk1.4.2_01
you have specified jre on the end of your path, it is not the jre that is required, but the jdk.
If you are using startup.bat and shutdown.bat (or .sh on Linux) you can amend the files with a text editor (open the startup.bat in notepad), like so:
@echo off
set JAVA_HOME=c:\j2sdk1.4.2_01
if "%OS%" == "Windows_NT" setlocal
I this will start Tomcat with the correct settings, regardless of your environment settings.

Open module for managing property file and environment variables

Looking for an open module for managing property files and environment variables (like CLASSPATH) set in a shell script. For handeling properties (preserving comments, supporting includes, appending new entries, and more) I have looked at SuperProperties from openadaptor but find certain functionality lacking. As for interfacing with common shell scripts/files containing setting for CLASSPATH, JAVA_HOME, other system/application variables another type of object editor is needed. Maybe JFIG?
Any ideas are greatly welcomed.

You seem wright, you hit a brick wall here with Air to find the location
of the command console on windows...
So in fact I never build an exe tool, but this little problem was a nice
case to test it and I tried it.:
I downloaded monodevelop
-GTK# for .NET 2.12.10*
-MonoDevelop 2.4.2*
from http://monodevelop.com/Download
created a console project and had an exe in 5 minutes !
You can download the findconsole tool and the projectfiles here:
http://greencollective.nl/temp/dump/findconsole_monoproject.zip
findconsole.exe will reveal the path/location of cmd.exe on a windows system.
Cheers,
Latcho

How can i put a file into blob(using sun.jdbc.odbc.JdbcOdbcDriver)

Hi
i tried to put a file into blob , but got a problem.....
My environment:windows 2000pro,JBuilder 5.0 enterprise,oracle 8.1.6,(not install oracle jdbc driver )
a part of program(my program is very uglily,if anyone want,later i paste it ba....~_~)
//Statement stmt2=null;
//Resultset rs2;
//opa1 is the blob data
void saveBlobTableToDisk(Connection con) {
try {
stmt2=con.createStatement();
sqlStr2="SELECT * FROM emp3 where id=1004";
rs2=stmt2.executeQuery(sqlStr2);
while (rs2.next()) {
Blob aBlob=rs2.getBlob("opa1");
i got the exception :
" null
java.lang.UnsupportedOperationException
     at sun.jdbc.odbc.JdbcOdbcResultSet.getBlob(JdbcOdbcResultSet.java:4174)
     at test3.Frame1.saveBlobTableToDisk(Frame1.java:48)
     at test3.Frame1.<init>(Frame1.java:26)
     at test3.Application1.<init>(Application1.java:5)
     at test3.Application1.main(Application1.java:8) "
and the windows pop up a messagebox said that(about) my memory "0x09af007f" could not read, error in javaw.exe .
Later i used (ResultSet)getBinaryStream() to solve it. but getBinaryStream() only return a InputStream,so that i can make blob to a file,but i can't make a file to blob using jdbc.....
I am very stupid that installing sun java, oracle jdbc driver etc....(because i must set a lot of thing such as classpath,java_home etc), Can i only use JBuilder to do that ?
Or i must install oracle jdbc driver ?
Thanks.

My guess here is that Sun's JDBC-ODBC bridge doesn't handle the BLOB datatype. Most ODBC drivers don't support that datatype, so I wouldn't expect the bridge to.
Is there a reason that you can't use the Oracle driver?
Justin

How can i put a file into blob using jdbc !?

Hi
i tried to put a file into blob , but got a problem.....
My environment:windows 2000pro,JBuilder 5.0 enterprise,oracle 8.1.6,(not install oracle jdbc driver )
a part of program(my program is very uglily,if anyone want,later i paste it ba....~_~)
//Statement stmt2=null;
//Resultset rs2;
//opa1 is the blob data
void saveBlobTableToDisk(Connection con) {
try {
stmt2=con.createStatement();
sqlStr2="SELECT * FROM emp3 where id=1004";
rs2=stmt2.executeQuery(sqlStr2);
while (rs2.next()) {
Blob aBlob=rs2.getBlob("opa1");
i got the exception :
" null
java.lang.UnsupportedOperationException
     at sun.jdbc.odbc.JdbcOdbcResultSet.getBlob(JdbcOdbcResultSet.java:4174)
     at test3.Frame1.saveBlobTableToDisk(Frame1.java:48)
     at test3.Frame1.<init>(Frame1.java:26)
     at test3.Application1.<init>(Application1.java:5)
     at test3.Application1.main(Application1.java:8) "
and the windows pop up a messagebox said that(about) my memory "0x09af007f" could not read, error in javaw.exe .
Later i used (ResultSet)getBinaryStream() to solve it. but getBinaryStream() only return a InputStream,so that i can make blob to a file,but i can't make a file to blob using jdbc.....
I am very stupid that installing sun java, oracle jdbc driver etc....(because i must set a lot of thing such as classpath,java_home etc), Can i only use JBuilder to do that ?
Or i must install oracle jdbc driver ?
Thanks.
D.T.

My guess here is that Sun's JDBC-ODBC bridge doesn't handle the BLOB datatype. Most ODBC drivers don't support that datatype, so I wouldn't expect the bridge to.
Is there a reason that you can't use the Oracle driver?
Justin

CLASSPATH & JAVA_HOME

Similar Messages

Maybe you are looking for