BarrySW19

BarrySW19 has asked 0 questions and find answers to 23 problems.

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Java developer working in the London investment banking industry. 25 years IT experience, I've probably worked with most of the Java technologies out there at some point.

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BarrySW19 questions

BarrySW19 answers

Handling JDBC connection when v$session.osuser value is more than 30 chars
HashMap or ConcurrentHashMap for single writer / single reader scenario?
Type mismatch when using Map.entrySet()
Groovy function call omiting the parentheses
How to match the middle character in a string with regex?
AtomicInteger: keep non-negative
How to create max method that gets 4 numbers and returns the maximum number?
Why do java.util.Calendar before() and after() methods take an Object as an argument, and simply return false if the passed Object is not a Calendar? [duplicate]
NullPointerException in hashCode() when deserializing an object graph
Spring boot testing with liquibase fails