fix "PDF Document not closed" warnings that sometimes occured

Catalysts / cat-boot

CAT-Boot: A set of libraries on top of the famous and fabolous Spring Boot

Apache License 2.0

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Closed NoUsername closed 4 years ago

NoUsername commented 4 years ago

fix "PDF Document not closed" warnings that sometimes occured when generating PDFs

add parallelism test to expose any potential raceconditions