Sounds like you might have done this:
set CLASSPATH=/path/to/biojava.jar
javac myprogram.java
java myprogram
What you need to do is this:
set CLASSPATH=/path/to/biojava.jar
javac -cp $CLASSPATH myprogram.java
java -cp $CLASSPATH myprogram
Als
For advice on setting your classpath for biojava take a look at
http://www.biojava.org/started.html
Try typing echo $CLASSPATH to make sure your classpath is actually getting
set.
If everything looks ok and it still won't compile then send an email to
the list with your javac error statement.