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Posted to users@jena.apache.org by elio hbeich <el...@gmail.com> on 2018/09/21 09:28:32 UTC

java.lang.NullPointerException: InputStream is null

Hey,


I am trying to read an inputStream but i get the following error:

source code:

InputStream it =
FileManager.get().open("C:/Users/Toshiba/AndroidStudioProjects/MyApplicationapp/app/sampledata/MallOntology.owl")
;

Model model = ModelFactory.createDefaultModel();
model.read(it, "");

error:

 Process: com.example.toshiba.myapplication, PID: 7055
    java.lang.NullPointerException: InputStream is null
        at java.util.Objects.requireNonNull(Objects.java:228)
        at org.apache.jena.riot.RDFDataMgr.read(RDFDataMgr.java:266)
        at org.apache.jena.riot.RDFDataMgr.read(RDFDataMgr.java:254)
        at org.apache.jena.riot.adapters.RDFReaderRIOT.read(RDFReaderRIOT.java:69)
        at org.apache.jena.rdf.model.impl.ModelCom.read(ModelCom.java:275)
        at com.example.toshiba.myapplication.MainActivity$3.onCompleted(MainActivity.java:255)
        at com.facebook.GraphRequest$1.onCompleted(GraphRequest.java:301)
        at com.facebook.GraphRequest$5.run(GraphRequest.java:1380)
        at android.os.Handler.handleCallback(Handler.java:790)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6494)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)


Any advice

Best Regards

Re: java.lang.NullPointerException: InputStream is null

Posted by Andy Seaborne <an...@apache.org>.
The file does not exist.

(specifically, the file manager can't find it - one place it looks is 
on-disk)

     Andy

On 21/09/18 10:28, elio hbeich wrote:
> Hey,
> 
> 
> I am trying to read an inputStream but i get the following error:
> 
> source code:
> 
> InputStream it =
> FileManager.get().open("C:/Users/Toshiba/AndroidStudioProjects/MyApplicationapp/app/sampledata/MallOntology.owl")

That is not the name you showed last time.

Then
"MyApplication"
now
"MyApplicationapp"



> ;
> 
> Model model = ModelFactory.createDefaultModel();
> model.read(it, "");
> 
> error:
> 
>   Process: com.example.toshiba.myapplication, PID: 7055
>      java.lang.NullPointerException: InputStream is null
>          at java.util.Objects.requireNonNull(Objects.java:228)
>          at org.apache.jena.riot.RDFDataMgr.read(RDFDataMgr.java:266)
>          at org.apache.jena.riot.RDFDataMgr.read(RDFDataMgr.java:254)
>          at org.apache.jena.riot.adapters.RDFReaderRIOT.read(RDFReaderRIOT.java:69)
>          at org.apache.jena.rdf.model.impl.ModelCom.read(ModelCom.java:275)
>          at com.example.toshiba.myapplication.MainActivity$3.onCompleted(MainActivity.java:255)
>          at com.facebook.GraphRequest$1.onCompleted(GraphRequest.java:301)
>          at com.facebook.GraphRequest$5.run(GraphRequest.java:1380)
>          at android.os.Handler.handleCallback(Handler.java:790)
>          at android.os.Handler.dispatchMessage(Handler.java:99)
>          at android.os.Looper.loop(Looper.java:164)
>          at android.app.ActivityThread.main(ActivityThread.java:6494)
>          at java.lang.reflect.Method.invoke(Native Method)
>          at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
>          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
> 
> 
> Any advice
> 
> Best Regards
>