Re: [Geotools-gt2-users] RuntimeException: Unable to find function Length

[TundraGreen <wi...@th...>]

I have exactly the same problem that John had from the same source,
implementing the "How to read a shapefile example". I have read Jody's
response and tried to implement it. I don't have any problem including
something in the META-INF/servies folder in the jar. I know how to do that.
But I haven't been able to figure out what to include. I tried following the
directions in the API for implementing a DataStoreFactorySpi. These suggest
the following:

[Begin quote from API]
Implementation Notes
An instance of this interface should exist for all data stores which want to
take advantage of the dynamic plug-in system. In addition to implementing
this factory interface each DataStore implementation should have a services
file:
META-INF/services/org.geotools.data.DataStoreFactorySpi
The file should contain a single line which gives the full name of the
implementing class.
example:
e.g. org.geotools.data.mytype.MyTypeDataSourceFacotry
The factories are never called directly by client code, instead the
DataStoreFinder class is used.
[/End quote from API]

I don't know if this is what Jody was referring to, but in any event I
haven't been able to find anything that works. 

Can anyone provide more detail about what is required to get 
org.geotools.filter.FunctionFinder.findFunction(FunctionFinder.java:xx) to
be able to find the Length function.

Will



Jody Garnett wrote:
> 
> I can help with that one ... we make use of Factory Service Provider 
> Interface (ie Factory SPI) which makes use of META_INF/services/* (a 
> folder in your jar that advertises all the services the jar offers - 
> including the length function).
> 
> So when you do mvn assembly - you will need to make sure the 
> META_INF/services files are all merged up (no I don't know how to do
> this).
> 
> Jody
> 
> 
>>
>>
>> java -jar ./target/shapefile-reader-jar-with-dependencies.jar
>> ~/shapefiles/country.shp
>>
>> java.lang.RuntimeException: Unable to find function Length
>>         at
>> org.geotools.filter.FunctionFinder.findFunction(FunctionFinder.java:83)
>>         at
> 
> 

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