Affects Version/s: 1.4
Fix Version/s: 1.7
Streaming support was added to Base64 in commons-codec 1.4 with
CODEC-69. This introduced instance variables to Base64 which means the class can no longer be used as a shared BinaryEncoder instance.
For example, BinaryEncoder has an interface which could be (and was) used like this with Base64:
Base64 is no longer thread-safe in commons-codec 1.4, so code like the above which is accessed by multiple threads can throw NullPointerException:
Looking at the implementation of Base64, I think making it thread-safe for this kind of usage would be quite tricky. I haven't attempted to prepare a patch.
I would be happy if it was indicated in the Javadoc that Base64 is not thread-safe and should not be shared. However, some other users of commons-codec might be more worried about this regression.