Creating JIVariant from JIArray throws NullPointerException

[Karsten Kukat]

Hello,

to write arrays via OPC i have to create a JIVariant with an JIArray as value. My first tests resulted in bad exceptions. 

Here is my own mapping:

    public static JIVariant objectArrayToJIStringArray(Object valueObject) {

        List<Object> objectArrayString = (ArrayList<Object>) valueObject;

        String[] stringArray = new String[objectArrayString.size()];

        for (int i = 0; i < objectArrayString.size(); i++) {

            stringArray[i] = objectArrayString.get(i).toString();

        }

        JIArray jiArray = new JIArray(stringArray);

        return new JIVariant(jiArray);

    }

when returning "new JIVariant(jiArray);" the exception happens. 

Exception in thread "Thread-27" java.lang.NullPointerException

at org.jinterop.dcom.core.JIMarshalUnMarshalHelper$StringImpl.getLengthInBytes(JIMarshalUnMarshalHelper.java:1287)

at org.jinterop.dcom.core.JIMarshalUnMarshalHelper.getLengthInBytes(JIMarshalUnMarshalHelper.java:352)

at org.jinterop.dcom.core.JIVariant.initArrays(JIVariant.java:1113)

at org.jinterop.dcom.core.JIVariant.<init>(JIVariant.java:1012)

at org.jinterop.dcom.core.JIVariant.<init>(JIVariant.java:1193)

at OPCTools.objectArrayToJIStringArray(OPCTools.java:376)

        ......

In the class JIMarshalUnMarshalHelper seems to be the error. 

static int getLengthInBytes(Class c,Object obj, int FLAG)

{

if(obj != null && obj.getClass().equals(JIArray.class))

{

return ((JIArray)obj).getSizeOfAllElementsInBytes();

}

else

{

if ((c != IJIComObject.class || c != IJIDispatch.class) && obj instanceof IJIComObject)

{

c = IJIComObject.class;

}

if (((SerializerDeserializer)mapOfSerializers.get(c)) == null)

{

throw new IllegalStateException(MessageFormat.format(JISystem.getLocalizedMessage(JIErrorCodes.JI_UTIL_SERDESER_NOT_FOUND),new String[]{c.toString()}));

}

return ((SerializerDeserializer)mapOfSerializers.get(c)).getLengthInBytes(obj,FLAG);

}

}

in this constellation a null value can be in the call "getLengthInBytes" which throws an exception. (return ((SerializerDeserializer)mapOfSerializers.get(c)).getLengthInBytes(obj,FLAG);)

Now i have two questions.

Is my way to write arrays wrong? (I send the values as WriteRequests like in other posts)

Is this a bug in the org.jinterop.dcom.core library? I'm using version 2.0.8

Greetings

Karsten