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Java Forum / First Aid / April 2005Tomcat: importing a package..
I really don't understand what I'm doing wrong here.. I'm on chapter 8 of the Java Servlet & JSP Cookbook.. I dl'd the package he says (com.jar) and put it in <webappRoot>/lib.. servlet is here.. C:\tomcat\webapps\file\WEB-INF\classes\com\jspservletcookbook\UploadServlet.class com.jar is here.. C:\tomcat\webapps\file\WEB-INF\lib in servlet: package com.jspservletcookbook; import javax.servlet.*; import javax.servlet.http.*; import com.oreilly.servlet.MultipartRequest; import com.oreilly.servlet.multipart.DefaultFileRenamePolicy; import java.util.Enumeration; public class UploadServlet extends HttpServlet { // ... etc... now in this package I dl'd he has it "broken down", so I can see structure, docs, src, etc in jar file (cos-05Nov2000\classes\com\oreilly\servlet\multipart).. this is right code to import that package.. yet when I compile the servlet I get all these errors.. UploadServlet.java:5: package com.oreilly.servlet does not exist import com.oreilly.servlet.MultipartRequest; ^ UploadServlet.java:6: package com.oreilly.servlet.multipart does not exis import com.oreilly.servlet.multipart.DefaultFileRenamePolicy; ^ UploadServlet.java:22: cannot resolve symbol symbol : class MultipartRequest location: class com.jspservletcookbook.UploadServlet MultipartRequest mpr = new MultipartRequest(request,webTempPath, ^ UploadServlet.java:22: cannot resolve symbol symbol : class MultipartRequest location: class com.jspservletcookbook.UploadServlet MultipartRequest mpr = new MultipartRequest(request,webTempPath, ^ 4 errors (I had to recompile b/c had to change this line.. webTempPath = getServletContext().getRealPath("/") + "data"; to webTempPath = getServletContext().getRealPath("\\") + "data"; make sense? I'm running Tomcat on Windows 2000 (for now... later will want to make this work on my website server, on unix..) would appreciate any leads.. thank you.. Frances Frances Del Rio <fdr58@yahoo.com> said: >I really don't understand what I'm doing wrong here.. > >I'm on chapter 8 of the Java Servlet & JSP Cookbook.. > >I dl'd the package he says (com.jar) and put it in <webappRoot>/lib.. ... >now in this package I dl'd he has it "broken down", so I can see >structure, docs, src, etc in jar file >(cos-05Nov2000\classes\com\oreilly\servlet\multipart).. this is right >code to import that package.. That won't work for a library jar file. In a library jar file, the directory hierarchy within the jar should exactly match the package/class hierarchy -- so, for example >UploadServlet.java:5: package com.oreilly.servlet does not exist >import com.oreilly.servlet.MultipartRequest; > ^ ... this 'com.oreilly.servlet.MultipartRequest' class file should be at com/oreilly/servlet/MultipartRequest.class within the jar file. So, at the minimum you'll need to 'jar xf' (extract) the file you now have, and 'jar cf' (create) a new jar file, starting from just below the com/ directory in which the class files are, to get a real library jar file.  SignatureWolf a.k.a. Juha Laiho Espoo, Finland (GC 3.0) GIT d- s+: a C++ ULSH++++$ P++@ L+++ E- W+$@ N++ !K w !O !M V PS(+) PE Y+ PGP(+) t- 5 !X R !tv b+ !DI D G e+ h---- r+++ y++++ "...cancel my subscription to the resurrection!" (Jim Morrison) > Frances Del Rio <fdr58@yahoo.com> said: > [quoted text clipped - 3 lines] >> >>I dl'd the package he says (com.jar) and put it in <webappRoot>/lib.. I made a mistake here.. of course I meant <webappRoot>/WEB-INF/lib.. (which is what I did.....;) > ... >>now in this package I dl'd he has it "broken down", so I can see >>structure, docs, src, etc in jar file [quoted text clipped - 11 lines] > ... this 'com.oreilly.servlet.MultipartRequest' class file should be > at com/oreilly/servlet/MultipartRequest.class within the jar file. but it is, Juha... in com\oreilly\servlet is a class called MultipartRequest.class... in that 'servlet' dir are a bunch of classes AND a dir called 'multipart'... I "unpacked" jar file in DOS shell, pls see screen-shot here.. http://www.francesdelrio.com/jar.html so: in <appRoot>WEB-INF/lib should be all these files/dirs that we see in this screen-shot, right? if you import a package from a servlet, does Tomcat autom. know to look for it in WEB-INF/lib? so if in a servlet that is here.. <appRoot>\WEB-INF\classes\com\jspservletcookbook I do this.. import com.oreilly.servlet.MultipartRequest; import com.oreilly.servlet.multipart.DefaultFileRenamePolicy; it should find the package, right? thank you very much for yr response, Juha.. Frances [ I'm reordering the message a bit - to keep some things better together ] Frances Del Rio <fdr58@yahoo.com> said: >> Frances Del Rio <fdr58@yahoo.com> said: >> [quoted text clipped - 15 lines] >> >> That won't work for a library jar file. ... >> ... this 'com.oreilly.servlet.MultipartRequest' class file should be >> at com/oreilly/servlet/MultipartRequest.class within the jar file. > >but it is, Juha... in com\oreilly\servlet is a class called >MultipartRequest.class... ... >I "unpacked" jar file in DOS shell, pls see screen-shot here.. >http://www.francesdelrio.com/jar.html [slight grumble about presenting textual info as graphics..] Ok; I was thrown off by the path you wrote earlier (the one quoted above, starting with cos-05Nov2000\... ) -- I was assuming that to be the directory structure within the jar file. What your screen shot showed was a correct library jar structure. And now thta I read your other messages as well, you're having problems at compile time, right? If so, Tomcat is not involved at that point. So, when compiling a servlet, you'll have to do it manually - and at that time you need to explicitly tell javac where your libraries are. So, javac -classpath D:\path\to\some.jar;F:\path\to\other.jar SomeServlet.java or something like that. At runtime, Tomcat will find the jar files needed by (compiled) classes, and at that point it is sufficient to just leave them at WEB-INF\lib. Was this of any help? SignatureWolf a.k.a. Juha Laiho Espoo, Finland (GC 3.0) GIT d- s+: a C++ ULSH++++$ P++@ L+++ E- W+$@ N++ !K w !O !M V PS(+) PE Y+ PGP(+) t- 5 !X R !tv b+ !DI D G e+ h---- r+++ y++++ "...cancel my subscription to the resurrection!" (Jim Morrison) > [slight grumble about presenting textual info as graphics..] > [quoted text clipped - 15 lines] > > Was this of any help? oh yes, it was.. thank you so much.. I had to put path to package in batch file I use to compile.. (also, had missed fact that needed to alter class in package to put 'package com' at the top (b/c class is now in WEB-INF\lib\com (instead of in WEB-INF\classes\<package>) and then had to do a new batch in WEB-INF\lib\com to compile class in package that will become jar file.. and then after compiling remove src for class and batch from 'com' dir before I convert to jar.. geeees... this path-thing to everything can get pretty iffy... ;) now I see why people use ant and stuff like that, I mean for large apps you can go crazy here.. (I dl'd ant once but couldn't figure out how to use it.. I guess eventually I will have to..) thank you so much for your help.. Frances Juha, just as an experiment I packaged a simple helper class I have in an app.. class is sH.class (simple class that I use just to store vars to generate HTML code..) I put this class in WEB-INF\lib\com, then converted this 'com' into a jar.. ('jar cf sH.jar com' in WEB-INF\lib) so now I have WEB-INF\lib\sH.jar (sH.jar = com\sH.class..) and if in WEB-INF\lib I do 'jar tf sH.jar' I get META-INF/ META-INF/MANIFEST.MF com/ com/sH.class so far so good, right? so in servlet (which is in WEB-INF\classes\hm) I now do import com.sH; but when compiling servlet get told that 'package com.sH' does not exist.. I must be missing something here.. (again, Tomcat knows to look for packages in WEB-INF\lib, right? Juha, thanks again.. Frances > Frances Del Rio <fdr58@yahoo.com> said: > [quoted text clipped - 27 lines] > below the com/ directory in which the class files are, to get a real > library jar file. > Juha, just as an experiment I packaged a simple helper class I have in > an app.. class is sH.class (simple class that I use just to store vars [quoted text clipped - 18 lines] > (again, Tomcat knows to look for packages in WEB-INF\lib, right? Juha, > thanks again.. Frances ok, I think mistake I made is I gave package same name as class inside 'com' dir.. what I did now: in WEB-INF\lib I have com\sH.class, so: to create jar file: "jar cf html.jar com", which, when I do "jar tf html.jar" returns: META-INF/ META-INF/MANIFEST.MF com/ com/sH.class in servlet (in WEB-INF\classes\hm) I do import com.sH; yet when I compile I get told 'package com doesn't exist'.. now I REALLY don't know what I am doing wrong.. would appreciate leads... thank you... Frances are u trying to compile the servlet or run/access thru browser the servlet? If you are just trying to compile - I think maybe the issue is not in the package structure. it's in the compiling tool you're using. How are you compiling your code? Make sure that the jar is in your classpath or if you're using one of the standard IDE's. that you have it listed, with the correct path, as one of the required libraries. Free MagazinesGet these publications absolutely FREE for up to 12 months. 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