Servlet dependent class not found

[sam wootton]

Hi,

Thanks in advance for any help or advice.

I am having trouble getting my webapp working (I actually had it working a year ago, but dusted it off and wanted to set it up again).

I am running this on Ubuntu. This is my webapp setup:

Directory structure:

webapps/mfservice/WEB-INF/classes/server/MFServer.class

My deployment descriptor file (webapps/mfservice/WEB-INF/web.xml):

<description></description>
        <servlet>
            <servlet-name>MFServlet</servlet-name>
            <servlet-class>server.MFServer</servlet-class>
        </servlet>
        <servlet-mapping>
            <servlet-name>MFServlet</servlet-name>
            <url-pattern>/music</url-pattern>
        </servlet-mapping>

When i attempt to hit "http://192.168.0.6:8080/mfservice/music"

I get:

javax.servlet.ServletException: Wrapper cannot find servlet class server.MFServer or a class it depends on

I have put all dependent jars in my webapps "lib" folder. I am not sure what else to try or how to go about fixing this?

Sometimes I do not get this error, sometimes I simply get a 404 with no error at all:

HTTP Status 404 - Servlet MFServlet is not available

Regards, Sam

[Bear Bibeault]

Do the logs show more info; perhaps a ClassNotFound root cause?

[sam wootton]

Hi

I wish they did, but not sure they do...

  delegate: false^M
  repositories:^M
----------> Parent Classloader:^M
org.apache.catalina.loader.StandardClassLoader@e4e6cf^M
 server.MFServer
java.lang.ClassNotFoundException: server.MFServer
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1128)
        at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:827)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:744)

Dec 17, 2013 8:21:08 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Allocate exception for servlet MFServlet
java.lang.ClassNotFoundException: server.MFServer
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1128)
        at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:827)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)

I have all my jars in lib:

-rw-rw-r-- 1 sam sam  58160 Dec 17 19:33 commons-codec-1.4.jar
-rw-rw-r-- 1 sam sam 160519 Dec 17 19:31 commons-dbcp-1.4.jar
-rw-rw-r-- 1 sam sam  49572 Dec 17 19:31 commons-dbutils-1.4.jar
-rw-rw-r-- 1 sam sam  59590 Dec 17 19:32 commons-fileupload-1.2.2.jar
-rw-rw-r-- 1 sam sam 163151 Dec 17 19:32 commons-io-2.1.jar
-rw-rw-r-- 1 sam sam  60686 Dec 17 19:33 commons-logging-1.1.1.jar
-rw-rw-r-- 1 sam sam 111119 Dec 17 19:33 commons-pool-1.6.jar
-rw-rw-r-- 1 sam sam 352585 Dec 17 19:33 httpclient-4.1.3.jar
-rw-rw-r-- 1 sam sam 107498 Dec 17 19:33 httpclient-cache-4.1.3.jar
-rw-rw-r-- 1 sam sam 181409 Dec 17 19:33 httpcore-4.1.4.jar
-rw-rw-r-- 1 sam sam  26938 Dec 17 19:33 httpmime-4.1.3.jar
-rwxrw-r-- 1 sam sam 132002 Dec 17 19:30 javax.servlet.jar
-rwxrw-r-- 1 sam sam 507849 Dec 17 19:33 mail.jar
-rw-rw-r-- 1 sam sam 789885 Dec 17 19:34 mysql-connector-java-5.1.18-bin.jar

Regards, Sam

[Bear Bibeault]

Hmmm, it's clearly ticked off about your MFServer class. But it looks like you've dotted all the i's on initial inspection.

Grasping at straws: are you on Windows? If so, I've seen weird problems like this as a result of casing issues in file names. Something to check. Also, MFServer and MFServlet are really close in spelling; might there be an instance where they were interchanged perhaps?

[sam wootton]

No, in my initial post I mentioned OS is Ubuntu (its local server I ssh in to from windows actually).

I compile my src code from

$:/home/sam/music-alms-project/music-alms/src

javac -d ~/tomcat/webapps/mfservice/classes/ server/MFServer.java

Yeah, i just don't see why I cant get this to work. Tomcat examples work fine... im lost as to what to try!

Regards, Sam

[Bear Bibeault]

sam wootton wrote:No, in my initial post I mentioned OS is Ubuntu (its local server I ssh in to from windows actually).

Oh, dang. Sorry. I looked too, and completely missed it.

I went through the list of the usual suspects and it looks like you're not tripping over any of those.

I'm stumped too at the moment.

No stone unturned: have you launched the Tomcat manager app to make sure that the app is running as an independent context? (99.9% sure it is, but...)

[Bear Bibeault]

Is this a typo?

javac -d ~/tomcat/webapps/mfservice/classes/ server/MFServer.java

Missing WEB-INF?

Though you mentioned in your first post that the class file was in WEB-INF/classes/server/

[sam wootton]

No probs.

Do you mean the main manager html?

http://samwootton.com:8080/

process

ps -ef | grep tomcat
sam      18406     1  0 20:19 pts/0    00:00:18 /home/sam/Downloads/jars/jdk1.7.0_45/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/usr/local/tomcat/endorsed -classpath /usr/local/tomcat/bin/bootstrap.jar -Dcatalina.base=/usr/local/tomcat -Dcatalina.home=/usr/local/tomcat -Djava.io.tmpdir=/usr/local/tomcat/temp org.apache.catalina.startup.Bootstrap start
sam      18538 17165  0 21:39 pts/0    00:00:00 grep --color=auto tomcat

Regards, Sam

[Bear Bibeault]

No, I meant:

http://localhost:8080/manager/html

You may need to configure access to this app.

(We posted at the same time above; make sure you see my question above about your compile command.)

[sam wootton]

Is this a typo?

* hangs head in shame *

... no it wasn't a typo, but it was my mistake. Well spotted and thank you!

How and why did I miss the obvious?

Works fine now (well, I can hit it):

http://samwootton.com:8080/mfservice/music

Regards, Sam

[Bear Bibeault]