Java 8 NullPointerException in Collectors.toMap

The Java 8 Collectors.toMap throws a NullPointerException if one of the values is ‘null’. This error make developers confused and don’t know why this behavior happens, although maps can contain null pointers as value without any problems. Is there a good reason why values cannot be null for Collectors.toMap? Let’s check the example to see … Read moreJava 8 NullPointerException in Collectors.toMap

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