Recebi esse erro de mapeamento ao tentar usar a função de converter, alguém pode me ajudar?
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Mon Jul 15 22:04:56 BRT 2019
There was an unexpected error (type=Internal Server Error, status=500).
No message available
java.lang.NullPointerException
at br.com.alura.forum.controller.dto.TopicoDto.<init>(TopicoDto.java:18)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
...