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### 4.2.3. Query

       /**
        * Retrieve POJO from the cache system. Return null if object does not exist in the cache.
        * Note that this operation is fast if there is already a POJO instance attached to the cache.
        *
        * @param id that associates with this node.
        * @return Current content value. Null if does not exist.
        * @throws PojoCacheException Throws if there is an error related to the cache operation.
        */
       Object find(String id) throws PojoCacheException;

This call will return the current object content located under `id`. This method call is useful when you don't have the exact POJO reference. For example, when you fail over to the replicated node, you want to get the object reference from the replicated cache instance. In this case, PojoCache will create a new Java object if it does not exist and then add the cache interceptor such that every future access will be in sync with the underlying cache store.

       /**
        * Query all managed POJO objects under the id recursively. Note that this will not return
        * the sub-object POJOs, e.g., if Person has a sub-object of Address, it
        * won't return Address pojo. Also note also that this operation is not thread-safe
        * now. In addition, it assumes that once a POJO is found with a id, no more POJO is stored
        * under the children of the id. That is, we don't mix the id with different POJOs.
        *
        * @param id The starting place to find all POJOs.
        * @return Map of all POJOs found with (id, POJO) pair. Return size of 0, if not found.
        * @throws PojoCacheException Throws if there is an error related to the cache operation.
        */
       Map findAll(String id) throws PojoCacheException;

This call will return all the managed POJOs under cache with a base Fqn name. It is recursive, meaning that it will traverse all the sub-trees to find the POJOs under that base. For example, if you specify the fqn to be root, e.g., `"/"` , then it will return all the managed POJOs under the cache.

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