Hi Denny, hi Daniel, hi all,
Welcome to Java :-) (more useful answers below)
On 09/04/14 10:41, Daniel Kinzler wrote:
Am 08.04.2014 23:34, schrieb Denny Vrandečić:
I was trying to use this, but my Java is a bit rusty. How do I run the
DumpProcessingExample?
I did the following steps:
git clone https://github.com/Wikidata/Wikidata-Toolkit
cd Wikidata-Toolkit
mvn install
mvn test
Now, how do I start DumpProcessingExample?
Looks like you are supposed to run it from Eclipse.
It would be very useful if maven would generate a jar with all dependencies for
the examples, or if there was a shell script that would allow us to run classes
without the need to specify the full class path.
Finding out how to get all the libs you need into the classpath is one of the
major annoyances of java...
First, the quick answer to Denny:
"""
Change to the directory of the example module (wdtk-examples), then run:
mvn exec:java
-Dexec.mainClass="org.wikidata.wdtk.examples.DumpProcessingExample"
"""
Anyway, this is not something one would normally do. Some clarifications
seem to be needed here.
The examples we have are not applications that you would ever want to
run. They don't do anything really useful (yet). The purpose of the
examples is to give Java developers a practical, well, example on how to
use the Wikidata Toolkit library. Since Wikidata Toolkit is a library
for Java, it is somehow presumed that you already know how to run a Java
application when you look into it ;-) Normally, every Java developer has
some preferred way in which she will normally do this, usually through
her IDE.
If you are new to Java, I would recommend you to start with a little
tutorial (there are plenty on the Web) and to use Eclipse (there are
other good IDEs for Java, but Eclipse is a safe bet if you don't know
your needs yet). We have detailed instructions on the homepage how to
install git and maven support for Eclipse so that it can do everything
for you [1]. An Eclipse user could run the examples, for example, by:
right click on file -> Run as -> Java application.
The "major annoyance" that Daniel remarked on is simply that there is no
single main application here. There can (and will) be many examples, so
naturally you have to tell Java which program to run. Doing this on the
command line is not convenient due to the long strings, but then again
that is not something you would normally do (and if you do, you could
create a one-line script with the command I gave above ;-).
In the future, we might have actual applications that are useful as
stand-alone tools. When this happens, we will of course provide suitable
stand-alone packages where you only need to run a single "main" file to
start the tool. This is also what people would do who use the library to
develop their own stand-alone applications. But if you want to work with
a multi-module library, you probably don't want an all-in-one package
that uses third party dependencies that you don't want or need.
Anyway, all hints on packaging are really appreciated -- our goal is to
provide packages that are most useful to you. We just started with the
obvious standard packages but we could create more specific bundles for
relevant applications. As we move along in alpha phase, these things
might still change quite a bit, of course ... ;-)
Cheers
Markus
[1] https://www.mediawiki.org/wiki/Wikidata_Toolkit/Eclipse_setup
-- daniel
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