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error java.lang.NoClassDefFoundError: javax/servlet/Servlet

 
Diane Pitts
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Posts: 4
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I am a student working on a project. I have created a new .jsp. It still says Hello World! I ran it to make sure everything works okay before I make changes to it and incorporate it into my project. I am getting an error 500 when I run it. Your help is very much appreciated.

Error message:

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: java.lang.NoClassDefFoundError: javax/servlet/Servlet
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:268)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause

java.lang.NoClassDefFoundError: javax/servlet/Servlet
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(ClassLoader.java:791)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
java.net.URLClassLoader.access$100(URLClassLoader.java:71)
java.net.URLClassLoader$1.run(URLClassLoader.java:361)
java.net.URLClassLoader$1.run(URLClassLoader.java:355)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(URLClassLoader.java:354)
java.lang.ClassLoader.loadClass(ClassLoader.java:423)
java.lang.ClassLoader.loadClass(ClassLoader.java:356)
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(ClassLoader.java:791)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
java.net.URLClassLoader.access$100(URLClassLoader.java:71)
java.net.URLClassLoader$1.run(URLClassLoader.java:361)
java.net.URLClassLoader$1.run(URLClassLoader.java:355)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(URLClassLoader.java:354)
java.lang.ClassLoader.loadClass(ClassLoader.java:423)
java.lang.ClassLoader.loadClass(ClassLoader.java:410)
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
java.lang.ClassLoader.loadClass(ClassLoader.java:410)
java.lang.ClassLoader.loadClass(ClassLoader.java:356)
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(ClassLoader.java:791)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
java.net.URLClassLoader.access$100(URLClassLoader.java:71)
java.net.URLClassLoader$1.run(URLClassLoader.java:361)
java.net.URLClassLoader$1.run(URLClassLoader.java:355)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(URLClassLoader.java:354)
java.lang.ClassLoader.loadClass(ClassLoader.java:423)
java.lang.ClassLoader.loadClass(ClassLoader.java:356)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1667)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:128)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(ClassLoader.java:791)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
java.net.URLClassLoader.access$100(URLClassLoader.java:71)
java.net.URLClassLoader$1.run(URLClassLoader.java:361)
java.net.URLClassLoader$1.run(URLClassLoader.java:355)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(URLClassLoader.java:354)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:134)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:628)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:149)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:340)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause

java.lang.ClassNotFoundException: javax.servlet.Servlet
java.net.URLClassLoader$1.run(URLClassLoader.java:366)
java.net.URLClassLoader$1.run(URLClassLoader.java:355)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(URLClassLoader.java:354)
java.lang.ClassLoader.loadClass(ClassLoader.java:423)
java.lang.ClassLoader.loadClass(ClassLoader.java:356)
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(ClassLoader.java:791)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
java.net.URLClassLoader.access$100(URLClassLoader.java:71)
java.net.URLClassLoader$1.run(URLClassLoader.java:361)
java.net.URLClassLoader$1.run(URLClassLoader.java:355)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(URLClassLoader.java:354)
java.lang.ClassLoader.loadClass(ClassLoader.java:423)
java.lang.ClassLoader.loadClass(ClassLoader.java:356)
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(ClassLoader.java:791)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
java.net.URLClassLoader.access$100(URLClassLoader.java:71)
java.net.URLClassLoader$1.run(URLClassLoader.java:361)
java.net.URLClassLoader$1.run(URLClassLoader.java:355)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(URLClassLoader.java:354)
java.lang.ClassLoader.loadClass(ClassLoader.java:423)
java.lang.ClassLoader.loadClass(ClassLoader.java:410)
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
java.lang.ClassLoader.loadClass(ClassLoader.java:410)
java.lang.ClassLoader.loadClass(ClassLoader.java:356)
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(ClassLoader.java:791)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
java.net.URLClassLoader.access$100(URLClassLoader.java:71)
java.net.URLClassLoader$1.run(URLClassLoader.java:361)
java.net.URLClassLoader$1.run(URLClassLoader.java:355)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(URLClassLoader.java:354)
java.lang.ClassLoader.loadClass(ClassLoader.java:423)
java.lang.ClassLoader.loadClass(ClassLoader.java:356)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1667)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:128)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(ClassLoader.java:791)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
java.net.URLClassLoader.access$100(URLClassLoader.java:71)
java.net.URLClassLoader$1.run(URLClassLoader.java:361)
java.net.URLClassLoader$1.run(URLClassLoader.java:355)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(URLClassLoader.java:354)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:134)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:628)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:149)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:340)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.35 logs.
 
Diane Pitts
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There were el-api.jar and jsp-api.jar files in the jdk/jre/lib/ext file. Once I deleted them the program worked.
 
Bear Bibeault
Author and ninkuma
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Had you copied them there?

This is a common mistake made by people who think that it makes compiling easier. It may, in fact, make compiling easier -- but it wreaks havoc at run time.

To anyone reading this at a later date, there's one rule about the jar files that come with Tomcat (or any other app server): Leave them alone.

Don't delete them.
Don't move them.
Don't copy them.

Follow this rule and no one gets hurt!
 
Diane Pitts
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I agree, one shouldn't normally delete files in the libraries, however, doing so in this case made mine work. I only deleted them after I compared the /ext folder against a second copy of the jre that I had made at the time of installation. (This jre is in no way connected to the netbean application) I saw the api.jar files were not in the original copy. I did not place the api.jar in the /ext folder, I don't know how they got there. Is it possible that netbeans creates these dynamically and puts them there?
 
Bear Bibeault
Author and ninkuma
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Diane Pitts wrote:I agree, one shouldn't normally delete files in the libraries, however, doing so in this case made mine work.

No, you misunderstand. The files should never have been in the ext folder in the first place. Someone or something copied them there. And that was the problem.

These files should only exist in the Tomcat installation.
 
Diane Pitts
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Thanks for making this more clear for me. I am so glad I found this forum. I can see it being of great help to me as I continue to learn netbeans.
 
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