Using an external JAR library

Question

Hi, I'm trying to use the JFreeChart library, but I'm having some trouble with getting the classpath set up correctly.
I managed to set the classpath variable to "$HOME/jfreechart-1.0.13/lib/jfreechart-1.0.13.jar", but the Java compiler doesn't appear to be reading the variable.
$ echo $CLASSPATH
$HOME/jfreechart-1.0.13/lib/jfreechart-1.0.13.jar
$ echo $CLASSPATH
$HOME/jfreechart-1.0.13/lib/jfreechart-1.0.13.jar
[chenyuz@raritan ~]$ javac VWAnalyzer.java
VWAnalyzer.java:8: package org.jfree.chart does not exist
import org.jfree.chart.*;
^
VWAnalyzer.java:9: package org.jfree.chart.axis does not exist
import org.jfree.chart.axis.*;
^
VWAnalyzer.java:10: package org.jfree.chart.plot does not exist
import org.jfree.chart.plot.*;
^
VWAnalyzer.java:11: package org.jfree.ui does not exist
import org.jfree.ui.*;
^
VWAnalyzer.java:13: cannot find symbol
symbol: class ApplicationFrame
public class VWAnalyzer extends ApplicationFrame {
                                ^
-snip-
17 errorsNow, when I try to compile it using the -cp option, it works (ish).
$ javac -classpath "$HOME/jfreechart-1.0.13/lib/jfreechart-1.0.13.jar" VWAnalyzer.java
VWAnalyzer.java:11: package org.jfree.ui does not exist
import org.jfree.ui.*;
^
VWAnalyzer.java:13: cannot find symbol
symbol: class ApplicationFrame
public class VWAnalyzer extends ApplicationFrame {
                                ^
VWAnalyzer.java:48: cannot access org.jfree.ui.Drawable
file org/jfree/ui/Drawable.class not found
                ChartPanel panel = new ChartPanel( chart, true );
                                   ^
VWAnalyzer.java:51: cannot find symbol
symbol  : method setContentPane(org.jfree.chart.ChartPanel)
location: class VWAnalyzer
                setContentPane( panel );
                ^
VWAnalyzer.java:52: cannot find symbol
symbol  : method pack()
location: class VWAnalyzer
                pack();
                ^
VWAnalyzer.java:53: cannot find symbol
symbol  : method setVisible(boolean)
location: class VWAnalyzer
                setVisible( true );
                ^
6 errorsNow there's another dependency that I need to include, which is why the second compile (the one using -classpath) wasn't completely successful. However, when I try adding in that second JAR file to the classpath, the whole operation fails like the first compile:
$ javac -classpath "$HOME/jfreechart-1.0.13/lib/jcommon-1.0.16.jar;$HOME/jfreechart-1.0.13/lib/jfreechart-1.0.13.jar" VWAnalyzer.java
VWAnalyzer.java:8: package org.jfree.chart does not exist
import org.jfree.chart.*;
^
VWAnalyzer.java:9: package org.jfree.chart.axis does not exist
import org.jfree.chart.axis.*;
^
VWAnalyzer.java:10: package org.jfree.chart.plot does not exist
import org.jfree.chart.plot.*;
^
VWAnalyzer.java:11: package org.jfree.ui does not exist
import org.jfree.ui.*;
^
VWAnalyzer.java:13: cannot find symbol
symbol: class ApplicationFrame
public class VWAnalyzer extends ApplicationFrame {
                                ^
-snip-
VWAnalyzer.java:53: cannot find symbol
symbol  : method setVisible(boolean)
location: class VWAnalyzer
                setVisible( true );
                ^
17 errorsSo essentially I have two questions:
1. Why is my computer not recognizing the global CLASSPATH variable?
2. Why can I not add two dependencies to the classpath when using the -classpath option?
I'm on a Linux computer and here's my Java version:
$ java -version
java version "1.5.0_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_04-b05)
Java HotSpot(TM) Server VM (build 1.5.0_04-b05, mixed mode)

Answer 1

sabre150 wrote:
C_Zhao wrote:
Point taken :)
Thanks, it works now.
I just expanded the $HOME and used a colon instead of a semi-colon.
But one other thing. I tried using the * wildcard, but it didn't seem to work:
CLASSPATH='/home/chenyuz/jfreechart-1.0.13/lib/*'Is this operation not supported in Java 1.5?It never has been supported! One must explicitly name the jars. You could always write a script to build the classpath for you by listing all the jars in a directory.*
Ahem, in [Java 6:|http://java.sun.com/javase/6/docs/technotes/tools/windows/javac.html#options]
<quote>
As a special convenience, a class path element containing a basename of * is considered equivalent to specifying a list of all the files in the directory with the extension .jar or .JAR.
</quote>