How to use byte[] in EJB Model

Hi Colleagues,
I have problem with binding byte[] to model attribute.
So I have methos myMethod(byte[] byteArr).
byte[] in the model is represent as Byte_Item type.
So I fill this attribute in this way:
inputFile is of type byte[]
for (byte b: inputFile) {
IImportedFileElement el = wdContext.nodeImportedFile().createAndAddImportedFileElement();
el.setItem(b);
Then when I'm executing model object Ireceive.
java.lang.NullPointerException: while trying to invoke the method java.lang.Object.getClass() of an object loaded from local variable 'value'
at com.sap.tc.webdynpro.model.ejb.model.EJBGenericModelClassExecutable.setPropertiesForModelClass(EJBGenericModelClassExecutable.java:485)
at com.sap.tc.webdynpro.model.ejb.model.EJBGenericModelClassExecutable.buildModelClassListFromCollection(EJBGenericModelClassExecutable.java:655)
at com.sap.tc.webdynpro.model.ejb.model.EJBGenericModelClassExecutable.setPropertiesForModelClass(EJBGenericModelClassExecutable.java:553)
at com.sap.tc.webdynpro.model.ejb.model.EJBGenericModelClassExecutable.fillReturnParameterToMc(EJBGenericModelClassExecutable.java:711)
at com.sap.tc.webdynpro.model.ejb.model.EJBGenericModelClassExecutable.execute(EJBGenericModelClassExecutable.java:158)
Could you help me with this problem.
Best Regards,
Dimitar

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How to use byte[] in EJB Model

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