help: running jfreechart in linux

[jezzy_ph]

Hi,

I was able to successfully install jfreechart in Linux Redhat 9.0, but the problem is that java doesn't seem to detect that I am importing files from the jfreechart.jar so I alway end up with an error.

Am I doing something wrong? What I did was extract the tar.gz file as instructed in the installation manual.....do i need to configure anything before I can use JFreeChart?

Help Please!!!!

Thanks,
Jessamine

[david.gilbert]

Tell us what you are trying to do, and post the error message.

[dennislee]

Hi

please check your classpath if it not be setted, do like this
# export classpath = /opt/jfreechart/xxx(your install paht);

[jezzy_ph]

Hi, this is the error that I'm getting.....I know that linux does not understand that it has to access these classes from the jfreechart.jar file.... the problem is I don't know how to make it work.

I tried the suggestion given by davidlee but I'm still getting errors.....what I entered was:

export classpath=/opt/jfreechart/root/Clumsy/jfreechart-0.9.16/jfreechart-0.9.16.jar

is this right?

Help Please!!

Errors encountered:

./SystemMonitorGraph.java:14: package org.jfree.chart does not exist
import org.jfree.chart.ChartFactory;
^
./SystemMonitorGraph.java:15: package org.jfree.chart does not exist
import org.jfree.chart.ChartPanel;
^
./SystemMonitorGraph.java:16: package org.jfree.chart does not exist
import org.jfree.chart.JFreeChart;
^
./SystemMonitorGraph.java:17: package org.jfree.chart.axis does not exist
import org.jfree.chart.axis.ValueAxis;
^
./SystemMonitorGraph.java:18: package org.jfree.chart.plot does not exist
import org.jfree.chart.plot.XYPlot;
^
./SystemMonitorGraph.java:19: package org.jfree.data.time does not exist
import org.jfree.data.time.Millisecond;
^
./SystemMonitorGraph.java:20: package org.jfree.data.time does not exist
import org.jfree.data.time.TimeSeries;
^
./SystemMonitorGraph.java:21: package org.jfree.data.time does not exist
import org.jfree.data.time.TimeSeriesCollection;
^
./SystemMonitorGraph.java:22: package org.jfree.ui does not exist
import org.jfree.ui.ApplicationFrame;
^
./SystemMonitorGraph.java:23: package org.jfree.ui does not exist
import org.jfree.ui.RefineryUtilities;

[david.gilbert]

I find it is easier to specify the classpath using the -classpath command line option of whatever utility you are using ('java', 'javac' etc.).

You didn't say whether you were compiling JFreeChart or running a demo or something else. But the error message is saying the JVM cannot find classes that are in the jfreechart-0.9.16.jar file, so your classpath setting is incorrect.

[kala]

Setting the classpath environment variable is not generally recommended under Java2. The easier way is to simply copy the jfreechart jar file (and its dependancies like jcommon) into the jre/lib/ext folder of your JDK installation (and get rid of the classpath setting altogether)

BK