[CODE4LIB] arg! classpaths!
(Arg! Classpaths!) Please tell me why Java throws the NoClassDefFoundError error when I think I have set up my classpath correctly: $ pwd /home/eric/lucene $ ls -lh total 720K -rw-r--r-- 1 eric eric 650K 2008-01-26 08:30 lucene-core-2.3.0.jar -rw-r--r-- 1 eric eric 52K 2008-01-26 08:30 lucene-demos-2.3.0.jar $ export CLASSPATH=$PWD:. $ echo $CLASSPATH /home/eric/lucene:. $ java org.apache.lucene.demo.IndexFiles Exception in thread main java.lang.NoClassDefFoundError: org/apache/ lucene/demo/IndexFiles Put another way, I have downloaded Lucene and I'm trying to do the demo application. [1] You are suppose to put the .jar files in your classpath and then run java org.apache.lucene.demo.IndexFiles. What am I doing wrong? [1] http://lucene.apache.org/java/2_3_0/demo.html -- Eric Lease Morgan
Re: [CODE4LIB] arg! classpaths!
Hi, On Jan 26, 2008 8:30 AM, Eric Lease Morgan [EMAIL PROTECTED] wrote: (Arg! Classpaths!) Please tell me why Java throws the NoClassDefFoundError error when I think I have set up my classpath correctly: $ pwd /home/eric/lucene $ ls -lh total 720K -rw-r--r-- 1 eric eric 650K 2008-01-26 08:30 lucene-core-2.3.0.jar -rw-r--r-- 1 eric eric 52K 2008-01-26 08:30 lucene-demos-2.3.0.jar When dealing with JAR files, each entry in CLASSPATH should be the full path to the JAR file, e.g., export CLASSPATH=/home/eric/lucene/lucene-core-2.3.0.jar:/home/eric/lucence/lucene-demos-2.3.0.jar You use a plain directory as a CLASSPATH component only if you intend to use .class files that has not been packaged up in a JAR. Regards, Galen Charlton [EMAIL PROTECTED] AKA [EMAIL PROTECTED]
Re: [CODE4LIB] arg! classpaths! [resolved]
On Jan 26, 2008, at 9:40 AM, Godmar Back wrote: Please see http://faq.javaranch.com/java/HowToSetTheClasspath On Jan 26, 2008, at 9:49 AM, Galen Charlton wrote: When dealing with JAR files, each entry in CLASSPATH should be the full path to the JAR file, e.g., export CLASSPATH=/home/eric/lucene/lucene-core-2.3.0.jar:/home/eric/ lucence/lucene-demos-2.3.0.jar You use a plain directory as a CLASSPATH component only if you intend to use .class files that has not been packaged up in a JAR. Thank you for the prompt replies. Yes, my CLASSPATH needed to be more specific; it needed to specify the .jar files explicitly. I can now run the demo. (Arg! Classpaths!) -- ELM
Re: [CODE4LIB] arg! classpaths! [resolved]
To add a bit of experience gained from 13 years of Java programming: I strongly recommend against setting CLASSPATH in the shell. Instead, use either the -cp switch to java, as in java -cp lucene-core...jar:lucene-demo-.jar or use the env command in Unix, as in env CLASSPATH=/home/eric/lucene/lucene-core-2.3.0.jar:/home/eric/lucence/lucene-demos-2.3.0.jar java These options achieve the same effect, but unlike export, they will not change the CLASSPATH environment variable for the remainder of your shell session. For instance, this command: export CLASSPATH=/home/eric/lucene/lucene-core-2.3.0.jar:/home/eric/lucence/lucene-demos-2.3.0.jar will make it impossible to execute javac or java for .class files in the current directory (because you've excluded . from the classpath, which by default is included.) Note, however, that this rule does not apply to shell scripts: inside shell scripts, it's okay to export CLASSPATH because such settings will be valid only for the shell executing the script; in Unix, changes to environment variable will not reflect back to the shell from the shell script was started. - Godmar You use a plain directory as a CLASSPATH component only if you intend to use .class files that has not been packaged up in a JAR. Thank you for the prompt replies. Yes, my CLASSPATH needed to be more specific; it needed to specify the .jar files explicitly. I can now run the demo. (Arg! Classpaths!) -- ELM
Re: [CODE4LIB] arg! classpaths! [resolved]
On Jan 26, 2008 10:12 AM, Godmar Back [EMAIL PROTECTED] wrote: Note, however, that this rule does not apply to shell scripts: inside shell scripts, it's okay to export CLASSPATH because such settings will be valid only for the shell executing the script; in Unix, changes to environment variable will not reflect back to the shell from the shell script was started. Oops, should read: ... changes to environment variables will not reflect back to the shell from *which* the shell script was started. I should also mention that if you place an export CLASSPATH command in your ~/.bash_profile or ~/.bashrc, you've committed the same mistake because the setting then will be valid for your initial shell session (or every new session, or both, depending on the content of your ~/.bash_profile.) So ignore any instructions that propose you do that. - Godmar
Re: [CODE4LIB] arg! classpaths!
Sadly the Lucene demo is not all that great. I recommend you start with Solr rather than Lucene directly. Erik On Jan 26, 2008, at 9:30 AM, Eric Lease Morgan wrote: (Arg! Classpaths!) Please tell me why Java throws the NoClassDefFoundError error when I think I have set up my classpath correctly: $ pwd /home/eric/lucene $ ls -lh total 720K -rw-r--r-- 1 eric eric 650K 2008-01-26 08:30 lucene-core-2.3.0.jar -rw-r--r-- 1 eric eric 52K 2008-01-26 08:30 lucene-demos-2.3.0.jar $ export CLASSPATH=$PWD:. $ echo $CLASSPATH /home/eric/lucene:. $ java org.apache.lucene.demo.IndexFiles Exception in thread main java.lang.NoClassDefFoundError: org/apache/ lucene/demo/IndexFiles Put another way, I have downloaded Lucene and I'm trying to do the demo application. [1] You are suppose to put the .jar files in your classpath and then run java org.apache.lucene.demo.IndexFiles. What am I doing wrong? [1] http://lucene.apache.org/java/2_3_0/demo.html -- Eric Lease Morgan
Re: [CODE4LIB] conference travel share -- portland to seattle?
I'm not sure what your budget is, but I'm taking Amtrak to Seattle after the conference, one-way for about $25.00 (with AAA discount). Both the Portland and Seattle train stations are in the downtown areas. I've ridden this train before; it's a nice, relaxed ride. I don't remember all the options, but I think there are at least 3 trains a day. wayne -Original Message- From: Code for Libraries [mailto:[EMAIL PROTECTED] On Behalf Of Jonathan Rochkind Sent: Friday, January 25, 2008 4:49 PM To: CODE4LIB@listserv.nd.edu Subject: [CODE4LIB] conference travel share -- portland to seattle? Are there any Code4Lib 08 conference attendees that will be returning via automobile from Portland to Seattle WA after the conference, and want to let me share their ride for appropriate cost share? I am going to vacation for a few days in Seattle after the conference, and am trying to figure out the best/cheapest/easiest way to get there. Jonathan -- Jonathan Rochkind Digital Services Software Engineer The Sheridan Libraries Johns Hopkins University 410.516.8886 rochkind (at) jhu.edu
