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I have many threads. Each thread creates and uses it's own WebClient (HtmlUnit framework). No one thread uses WebClient's instance from other thread. Is it thread safe?
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A thread-safe class is a class that guarantees the internal state of the class as well as returned values from methods, are correct while invoked concurrently from multiple threads. The collection classes that are thread-safe in Java are Stack, Vector, Properties, Hashtable, etc.
A thread-safe routine is one that can be called concurrently from multiple threads without undesirable interactions between threads. A routine can be thread safe for either of the following reasons: It is inherently reentrant. It uses thread-specific data or lock on mutexes.
From the documentation
Note: a WebClient instance is not thread safe. It is intended to be used from a single thread.
As long as each thread creates its own WebClient, you won't have any issues. From what you said, you're doing the right thing.
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