Please help!! -- java.lang.NoClassDefFoundError: antlr/collections/AST

Hi there,

When I tried to compile a servlet, I got
the following error:

$ javac RentBuyServlet.java
java.lang.NoClassDefFoundError: antlr/collections/AST
at at.dms.kjc.Main.beautifyParseError(Main.java:692)
at at.dms.kjc.Main.parseFile(Main.java:488)
at at.dms.kjc.Main.run(Main.java:119)
at at.dms.kjc.Main.compile(Main.java:449)
at at.dms.kjc.Main.main(Main.java:432)
$

I cannot figure out what causes this. Does
KJC here stands the Korean-Japanese-Chinese
language support package? I see nothing in
my code is related tothe international
language support though. Could some of you
here help me out? This is my first time to
post a msg in this forum. Your help is highly
appreciated. If you need to see the code, I
can show it. Please somebody help me!


------------------
Regards,
Tony

The message you are getting simply means that the javac compiler program cannot find a class that it needs. This invariably indicates that your classpath environment variable is not set correctly.
Also, maybe your path variable might not be set to include the current file folder or directory which is desgnated as a "."
You might just try
javac -classpath %CLASSPATH%;.;c athto/antlr/collections/AST RentBuyServlet.java

where you replace c athto/antlr/collections/AST with the path to imported package antlr/collections/AST

Thank you, jcbell.

After setting classpath, I got the
following error msg:

$ javac LeaseBuyServlet.java
LeaseBuyServlet.java:257: Can''t find method "setContentType(java.lang.String)"
$

If I commented this--
res.setContentType("text/html");
--out, I got the following error msg:

$ javac LeaseBuyServlet.java
LeaseBuyServlet.java:260: Can''t find method "getWriter()"
$

--this is from line--
PrintWriter out = res.getWriter();
--

But seen from the source code for my Java
Servlet package, these methods all belong
to HttpResponseServlet.

What could be the problem? Please help.
Thanks in advance.


------------------
Regards,
Tony

From what you describe, it is clear that you need to add the jar file (jsdk.jar) for your jsdk (java servlet development kit) into your classpath statement or environment varaible

just add it after a semicolon in your current classpath statement
example:
set CLASSPATH=".";%JAVA_HOME%;c:jsdklibjsdk.jar

you can also invoke the jsdk.jar with the javac statement as in
javac -classpath %CLASSPATH%;.;c:jsdklibjsdk.jar;pathto/antlr/collections/ASTRentBuyServlet.java RentBuyServlet.java


------------------


[This message has been edited by jcbell (edited July 17, 2000).]

Everytime I get this message, I have a syntax error in my code. Once I fix the syntax error this error message goes away. If you can't find an error in your code, include it in another post and maybe someone else can find it.
Hope this helps, C

<BLOCKQUOTE><font size="1" face="Verdana,Arial,Helvetica">quote:</font><HR>Originally posted by jcbell:
The message you are getting simply means that the javac compiler program cannot find a class that it needs. This invariably indicates that your classpath environment variable is not set correctly.
Also, maybe your path variable might not be set to include the current file folder or directory which is desgnated as a "."
You might just try
javac -classpath %CLASSPATH%;.;c URLathto/antlr/collections/AST RentBuyServlet.java

where you replace c URLathto/antlr/collections/AST with the path to imported package antlr/collections/AST[/quote]