Exception in docx-Export

[TorstenBMR]

Exporting a grid to docx without template:

java.lang.NullPointerException: Cannot invoke "Object.getClass()" because "o" is null
	at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:57) ~[na:na]
	at java.base/jdk.internal.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:36) ~[na:na]
	at java.base/java.lang.reflect.Field.get(Field.java:425) ~[na:na]
	at com.flowingcode.vaadin.addons.gridhelpers.HeaderFooterGridHelper.getTemplate(HeaderFooterGridHelper.java:22) ~[grid-helpers-0.2.0.jar:0.2.0]
	at com.flowingcode.vaadin.addons.gridhelpers.HeaderFooterGridHelper.getFooter(HeaderFooterGridHelper.java:64) ~[grid-helpers-0.2.0.jar:0.2.0]
	at com.flowingcode.vaadin.addons.gridhelpers.GridHelper.getFooter(GridHelper.java:308) ~[grid-helpers-0.2.0.jar:0.2.0]
	at com.flowingcode.vaadin.addons.gridexporter.BaseInputStreamFactory.lambda$getGridFooters$1(BaseInputStreamFactory.java:61) ~[grid-exporter-addon-1.0.1.jar:1.0.1]
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[na:na]
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[na:na]
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682) ~[na:na]

[mlopezFC]

Hi! ... thanks for reporting this!
Can you supply a snippet of your code to reproduce this issue?
I tried it without a footer (because based on the stack trace that you provided it seems that the problem is related to obtaining the footer from the grid), but I couldn't reproduce it.
Regards.

[TorstenBMR]

Hi, thanks for quick reply.
The problem occurs when you create the GridExporter after the grid is attached to the UI. I changed it in my code, so that the GridExporter is created immediatly when the grid is created (before attach) and it works fine.

[mlopezFC]

I tried to reproduce the issue by doing that, but it doesn't work. I will document that it should be used in that way (creating it before attaching the grid).