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where do we set the classpath for Tomcat?

Dear experts,

I recently move my app from stand alone Tomcat to "real" Tomcat. Not sure where to set the classpath for Tomcat? Can't seem to find the right place.... Thanks
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changcy77
Asked:
changcy77
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2 Solutions
 
jimmackCommented:
What does "real" mean? ;-)

Do you mean that you've integrated it into Apache or that you've changed from localhost to a deployed server :-)
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kennethxuCommented:
usually, you don't need to set classpath for tomcat, all you need is set is JAVA_HOME  and CATALINA_HOME environment vars.

if you mean by where to make your jar file accessible by tomcat apps. you should put in various lib dirs:

common/lib - visible by both tomcat server and all apps. for example, jdbc drivers.
server/lib - will only be accessed by tomcat server itself, not visible by apps.
shared/lib - visible by all apps, not visible to tomcat server. for example, your own util lib for all apps.
WEB-INF/lib - only visible by the app that contains the WEB-INF dir.
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changcy77Author Commented:
Tomcat gave me error message that it does not recognize my package name...
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changcy77Author Commented:
Experts,

This is the error I got when I just tried to open the first page to log in the application.


***************************************************



Error: 500
Location: /polym/WEB_INF/login.jsp
Internal Servlet Error:

org.apache.jasper.JasperException: Unable to compile class for JSPNote: sun.tools.javac.Main has been deprecated.
E:\apps\tomcat\work\localhost_8080%2Fpolym\_0002fWEB_0005fINF_0002flogin_0002ejsplogin_jsp_0.java:15: Package research not found in import.
import research.*;
       ^
1 error, 1 warning

      at org.apache.jasper.compiler.Compiler.compile(Compiler.java:247)
      at org.apache.jasper.runtime.JspServlet.loadJSP(JspServlet.java:413)
      at org.apache.jasper.runtime.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:149)
      at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:161)
      at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261)
      at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:369)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
      at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
      at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
      at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160)
      at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
      at java.lang.Thread.run(Thread.java:536)

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jimmackCommented:
Presumeably you have built some classes that reside in the "research" package.

If this is the case, follow kennethxu's advice and make sure that these classes appear in the correct lib directory.

In this case, it looks fairly application specific, so create the polym\WEB-INF\lib directory and put your classes in there (this should mean that you end up with a directory polym\WEB-INF\lib\research that contains .class files).

The error that you're getting is quite suspicious.  WEB-INF has a hyphen between the words, not an underscore.  Second, your JSP files shouldn't be in the WEB-INF directory, they should be in the polym directory.
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kennethxuCommented:
where did you put your research package?
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changcy77Author Commented:
thanks to both experts. I am going to raise the points to 50. Yes, I followed jimmack's instruction and it seems to work except one more error I got:

*******************************************************
java.lang.NoSuchMethodError: com.oreilly.servlet.MultipartRequest.(Ljavax/servlet/http/HttpServletRequest;Ljava/lang/String;ILcom/oreilly/servlet/multipart/FileRenamePolicy;)V
      at genbank.Upload.doPost(Upload.java:35)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
      at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
      at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
      at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160)
      at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
      at java.lang.Thread.run(Thread.java:536)

****************************************************

I used a library from oreilly's example to upload file to server. This code works on my testing stand alone Tomcat (4.1), but gave me this error on our production server(3.1). The method does exsit, so I don't know why it can't recognize the method.  I put this "com" package in the WEB-INF/lib/com   directory. Thanks.
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jimmackCommented:
There doesn't seem to be a method name!

What is line 35 of your Upload.java file?  (This line should be inside the doPost method and it should be trying to call a method in a MultipartRequest object).
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jimmackCommented:
Just a minute.  I think I've found it.  You're trying to call a constructor for a MultipartRequest object, but you are only supplying two parameters, an HttpServletRequest and a FileRenamePolicy.

There are no constructors that only take these two parameters.  If you want to include a FileRenamePolicy, you can only use one of the following constructors:

MultipartRequest(javax.servlet.http.HttpServletRequest request, java.lang.String saveDirectory, int maxPostSize, FileRenamePolicy policy)

or

MultipartRequest(javax.servlet.http.HttpServletRequest request, java.lang.String saveDirectory, int maxPostSize, java.lang.String encoding, FileRenamePolicy policy)

You need to include the saveDirectory and maxPostSize (and possibly the encoding method if you use the second constructor).
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changcy77Author Commented:
thanks very much. Actually, I did include all those 4 parameters and the codes work on my local machine.

The error came out when I move the code to another machine and change the save file directory on the production server. DO you know if the there is any limitation of the directory you can save the file to?
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jimmackCommented:
No.  There shouldn't be.  So long as you have write access.
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changcy77Author Commented:
I found there are another copy of the same library on this server, but it's used for another applicaton and under the web-inf of that application.

So, in that older version, the parameters are differnt from what I have. So, should Tomcat use the library under my web-inf, not use the another one? or it is possible Tomcat is looking at another library? THANKS.
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changcy77Author Commented:
My guess is correct. The Tomcat is looking at the lib in another directory, instead of under my application's web-inf/lib. So, after I upgraded the lib in another directory, it works. But, why? I thought it should check the web-inf/lib for each application? What is the order of the directory it checks? thanks.
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jimmackCommented:
Have a look in tomcat-docs/class-loader-howto.html.  This (hopefully) explains it all ;-)
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