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From: Isabel Drost <isabel@apache.org>
Organization: Apache
To: uima-user@incubator.apache.org
Subject: Unit testing CollectionReaders
Date: Wed, 29 Oct 2008 09:10:07 +0100
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Hello,

I am about to do my first steps using UIMA. I started out with the tutorial=
=20
and am about to write my first CollectionReader (extending=20
CollectionReader_ImplBase). As the tutorial says, I implemented initialize(=
)=20
to init the reader from its config parameters:

> ...
> File webKbDir =3D new File((String) getConfigParameterValue(PARAM_INPUTDI=
R));
> ...

In order to test the class I created a unit test. I thought it might be a g=
ood=20
idea to set the parameters of the reader in the setUp method of my test lik=
e=20
this:

> ...
> public void setUp() throws Exception {
>   this.reader =3D new WebKbReader();
>   URL path =3D this.getClass().getResource("dataset");
>   String pathString =3D path.getPath();
>   this.reader.setConfigParameterValue(WebKbReader.PARAM_INPUTDIR, path);
>   this.reader.initialize();
> }
=2E..

Unfortunately this gives me a null pointer exception in the line setting th=
e=20
config parameter that comes from inside UIMA:

> java.lang.NullPointerException
>	at=20
org.apache.uima.resource.ConfigurableResource_ImplBase.getConfigParameterVa=
lue(ConfigurableResource_ImplBase.java:37)
>	at=20
org.apache.mahout.clustering.webkb.kmeans.WebKbReader.initialize(WebKbReade=
r.java:58)


I had a look at the UIMA code, the line throwing the exception is the=20
following:

> public void setConfigParameterValue(String aParamName, Object aValue) {
>  getUimaContextAdmin().getConfigurationManager().setConfigParameterValue(
>      getUimaContextAdmin().getQualifiedContextName() + aParamName, aValue=
);
> }

I guess I am just making some stupid beginners mistake - forgot to initiali=
ze=20
some internal UIMA object before calling my reader? Unfortunately I have no=
=20
clue what could have gone wrong. Any help would be appreciated.

Thanks,
Isabel

=2D-=20
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