On Sun, 2002-03-17 at 17:15, Thomas Linden wrote: > Hi, > > On Sun, Mar 17, 2002 at 03:06:30PM -0500, Andrew C. Oliver wrote: > > Hi Tom, > > > > Logging in POI is primarily for tracing. We're of the opinion that > > logging is a prevalent concern of everything! Class libraries need it > > for debugging (turn on debug level logging and you find out all sorts of > > things). So as far as Major errors, yes, Exceptions are the preferred > > method of error handling. As far as debugging and diagnostics, well we > > think the logging is a necessary and important thing to have. > > ok, I agree. But it would be good, if the log4j stuff is only needed, > if you turn debugging on. In my case - I am not interested in such > logging, I just want to create a stupid excel file. As long as the > beast (M$ Excel) is able to read it I will be totally happy with it. >
Ooops sorry I forgot to get across that this is now supposed to be the case. The idea is supposed to be now, that you can or can not have Log4J around and POI::HSSF should work fine. > > Anyhow, this was the biggest problem with POI and I believe Nicola Ken > > Barozzi has fixed it. We just need people to test it. Check out and > > build the sources from CVS on Jakarta and let us know if you have > > problems. > > Yes, I did it, I checked out the CVS jakarta-poi module. I build it using > the provided build.sh (which was successfull). It didn't create the *poi-*.jar > files, but the build target "docs" did it. > > Unfortunately it still doesn't work. Here is how I call my application: > > #!/bin/sh > POI=/home/scip/tmp/jakarta-poi/build/jakarta-poi > >CLASSPATH=$CLASSPATH:jzeff.jar:$POI/jakarta-poi.jar:$POI/jakarta-contrib.jar:$POI/lib/optional/log4j-core.jar > java Jzeff > > I added log4j-core.jar to the classpath because it was the only .jar > whose name somewhat seemed to match. But if I execute it I get this: > > Exception in thread "main" java.lang.NoClassDefFoundError: >org/apache/commons/logging/LogFactory > at org.apache.poi.util.POILogFactory.<clinit>(POILogFactory.java:76) > at org.apache.poi.hssf.usermodel.HSSFWorkbook.<clinit>(HSSFWorkbook.java:113) > at Jzeff.<init>(Jzeff.java:116) > at Jzeff.main(Jzeff.java:368) > > Hm, I stressed find, grep and others, but I didn't find this in the source > tree. So I still need to install log4j. > is commons logging (http://cvs.apache.org/viewcvs/jakarta-poi/lib/core/commons-logging-1.0.jar) not in the distribution? It needs to be in your classpath (as this exception indicates). Its not really a logging api, its a front end to logging apis. We're now using commons logging which is a front end for logging. Basically it lets you lazy load logging APIs if you choose to use them, or not load them if you don't. > > Is there kinda preprocessor facility available for java? So you can > write > nope. Part of me wishes it did... But it does not. > #ifdef HAVE_LOG4J > // use logging > #else > // use System.out.println() or be silent > #endif > > just an idea > Give it a try with commons logging in your classpath and let me know. I'm very interested in this because its the bug I most want to be assured is fixed before 1.5 is released. > > regards, Tom > > > > On Sun, 2002-03-17 at 13:37, Thomas Linden wrote: > > > Hi, > > > > > > I found the POI project, which seems to be the thing I was always > > > looking for :-) Thanks for this great classes! > > > > > > But I have one problem with the software. It complains about some > > > classes which I do not have installed here: > > > > > > scip@monster: $ ./jzeff > > > Exception in thread "main" java.lang.NoClassDefFoundError: >org/apache/log4j/Category > > > at >net.sourceforge.poi.hssf.usermodel.HSSFWorkbook.<clinit>(HSSFWorkbook.java:127) > > > at Jzeff.<init>(Jzeff.java:115) > > > at Jzeff.main(Jzeff.java:367) > > > > > > After downloading the source I found that HSSF uses a thing called POILogger > > > to log things, for whatever reason. POILogger imports org/apache/log4j/Category > > > and org/apache/log4j/Priority - both are not in the package nor do I have them > > > installed. > > > > > > I assume this stuff is part of jakarta or something, I don't know. > > > > > > The problem is, that my project is a swing gui application, it has nothing > > > to do with java server pages or apache webserver things. Because of this I don't > > > want to include the whole jakarta engine into my project to get the creation > > > of excel files work (beside: how shall I explain this to my users?). > > > > > > So my simple questions are: > > > > > > 1. How do I get rid of the whole logging stuff without completely > > > rewriting or patching POI? > > > > > > or, if the above is not possible: > > > > > > 2. How can I get POI working without installing jakarta (and possibly > > > more stuff) ? > > > > > > and, finally, just because I'm interested: > > > > > > Why does a class library log informations to somewhere? If I had the > > > org/apache/log4j/Category installed I would not know that. IMHO a > > > class library should not log things. It should be completely silent. > > > The only thing it is allowed to do is it's purpose: Do it's job, throw > > > exceptions in case of errors and/or return the appropriate values > > > back to the application that uses it. The application then is responsible > > > to log errors or whatever it decides to log. > > > ^^^^ > > > > > > Thanks in advance, > > > > > > > > > - Tom > > > > > > > > > -- > > > $_=`perl -v`;s;^.*ll;;s;$^=unpack"u","'8V]D;')E<```";s;\W;;gs;$/=7* > > > ($^=~s;.;;g);%^=map{$_=>1}split//,lc;$_=join$\,(sort keys(%^))[map{ > > > ord($_)-$/}split//,'1I7E13?@E:7C1A7C=1:35<7C'];s"0(.)" \U$1"g;print; > > -- > > http://www.superlinksoftware.com > > http://jakarta.apache.org/poi - port of Excel/Word/OLE 2 Compound > > Document > > format to java > > http://developer.java.sun.com/developer/bugParade/bugs/4487555.html > > - fix java generics! > > The avalanche has already started. It is too late for the pebbles to > > vote. > > -Ambassador Kosh > > -- > $_=`perl -v`;s;^.*ll;;s;$^=unpack"u","'8V]D;')E<```";s;\W;;gs;$/=7* > ($^=~s;.;;g);%^=map{$_=>1}split//,lc;$_=join$\,(sort keys(%^))[map{ > ord($_)-$/}split//,'1I7E13?@E:7C1A7C=1:35<7C'];s"0(.)" \U$1"g;print; -- http://www.superlinksoftware.com http://jakarta.apache.org/poi - port of Excel/Word/OLE 2 Compound Document format to java http://developer.java.sun.com/developer/bugParade/bugs/4487555.html - fix java generics! The avalanche has already started. It is too late for the pebbles to vote. -Ambassador Kosh
