Prob.. in servlet access....

hi...
i have problems in running servlets...
iam unable to compile .java file and unable to run the servlet...
whats the prob....
i have set the classpath in D:\Program Files\Apache Software Foundation\Tomcat 5.0\common\lib
java_home D:\j2sdk1.4.2_06
and catalina_home D:\Program Files\Apache Software Foundation\Tomcat 5.0
i can able accessed the jsp pages from
D:\Program Files\Apache Software Foundation\Tomcat 5.0\webapps\ROOT
but unable the access the servlets?????
plz.. help me

when i compile servlet .class in this directory /ROOT/WEB-INF/classes.
by accessing this :http://localhost/servlet/servletname the error is coming:
the error is as follow:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Cannot allocate servlet instance for path /servlet/HelloServlet
     org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:388)
     org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:133)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.lang.ClassFormatError: HelloServlet (Bad magic number)
     java.lang.ClassLoader.defineClass0(Native Method)
     java.lang.ClassLoader.defineClass(ClassLoader.java:539)
     java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
     org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1634)
     org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:860)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1307)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1189)
     org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:369)
     org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:133)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.30 logs.
Apache Tomcat/5.0.30

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