Motivation:
The javadocs for ByteBuf#ensureWritable(int, boolean) indicate that it should not throw, and instead the return code should indicate the result of the operation. Due to a bug in AbstractByteBuf it is possible for a resize to be attempted on a buffer that may exceed maxCapacity() and therefore throw.
Modifications:
- If there is not enough space in the buffer, and force is false, then a resize should not be attempted
Result:
AbstractByteBuf#ensureWritable(int, boolean) enforces the javadoc constraints and does not throw.
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