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This compliant solution declares the FuncLoader static field final and treats it as a constant:

public static final FuncLoader m_functions;
// Initialize m_functions in a static initialization block

Fields declared static and final are also safe for multithreaded use (see TSM03-J. Do not publish partially initialized objects for more information). However, remember that simply changing the modifier to final might not prevent attackers from indirectly retrieving an incorrect value from the static final variable before its initialization (see DCL00-J. Prevent class initialization cycles for more information). Furthermore, individual members of the referenced object can also be changed if the object itself is mutable.

It is also permissible to use a wrapper method to retrieve the value of m_functions, allowing m_functions to be declared private (see rule OBJ01-J. Limit accessibility of fields for more information).

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Bibliography

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