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Return the contained value, if present, otherwise throw an exception to be
created by the provided s
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ObjectMapper provides functionality for reading and writing JSON, either to and
from basic POJOs (Pl
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Provides access to system-related information and resources including standard
input and output. Ena
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Thrown when a hostname can not be resolved.
- HashMap (java.util)
HashMap is an implementation of Map. All optional operations are supported.All
elements are permitte
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A reentrant mutual exclusion Lock with the same basic behavior and semantics as
the implicit monitor
- Servlet (javax.servlet)
Defines methods that all servlets must implement. A servlet is a small Java
program that runs within
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