jlp questions

• Java 8 Exception: com.fasterxml.jackson.datatype.jsr310.deser.InstantDeserializer has no default (no arg) constructor
• Spock Testing: Too few invocation
• Spark - How to add a StructField at the beginning of a StructType in scala
• Java validation @min @max annotion for null values
• How to check if a file name matches regex in shell script
• How to use Scala DataFrameReader option method
• What does ":+" mean in Scala

jlp answers