Classes and objects in Java must be initialized before they are used. You’ve previously learned that class fields are initialized to default values when classes are loaded, and that objects are ...

Community driven content discussing all aspects of software development from DevOps to design patterns. The correct way to convert a String to long in Java is to use the parseLong(String x) method of ...

When I upgrade spring-data-mongodb from 3.1.8 to 3.3.5, I encountered below exception: org.springframework.data.mapping.MappingException: Cannot convert [a, b, c] of type class java.util.ArrayList ...

Add a long inside a text String The easiest way to convert a long to a String is to append it to double quote. However, for complex output where a long must be embedded in a Java String, use the ...

Failed to convert value of type 'java.lang.String' to required type 'java.util.List' #3263 Closed bma6026 opened on Mar 5, 2020 ...

Arraylist is an heterogeneous collection of objects where each object can be indexed individually. while writing an application there could be some scenarios where we have arraylist object filled with ...