NoClassDefFoundError problems -native method

Question

hi all,
i've got a wierd problem... when i try to run a java appln ( for instance curl.java whose class is stored in a jar file) without giving a proper argument say like:
java XX.RR.YY.curl
a message prompts me to input a valid argument :
Usage: XX.RR.YY.hyd <options>
but when i try to run the same program - this time giving it a valid argument- like :
java XX.RR.YY.curl -curltest.xml
it spews out the following error messages along many others
Exception in thread "main" java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:130)
my point is why does java fail to find the class when i give it a valid argument and not when i do not give it any.
thanks in advance

Answer 1

exactly ... my java program has a similar code in it
regarding the arg checking .
so it does mean that java had found my appln
class(yay! my classpath is right) and had run thru a
few lines of code to get to the point where it
realized it needed some arguments and so gently asked
me supply an argument (a valid filename in my case)...Did you write this code? Did you put in the line where it displays the usage?
so the next thing i do is run the same command java
xx.xx.xx -curltest.xml ( i've supplied a valid
argument this time ) ... the result :
Exception in thread "main"
java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:130)
why did java fail to grab my appln class this time -
in contrast to the first time where it found the class
file w/o any problems. Try just using "java xx.xx.xx curltest.xml" (without the '-').