<p> Checks if a String is empty ("") or null. </p> <pre> StringUtils.isEmpty(null) = true StringUtils.isEmpty("") = true StringUtils.isEm

@param channel Mock channel to write ack/nack when received messages @return

<p> Checks if the String contains only unicode digits. A decimal point is not a unicode digit and returns false. </p> <p> <code>null</code> will retu

<p> Removes control characters (char &lt;= 32) from both ends of this String, handling <code>null</code> by returning <code>null</code>. </p> <p> The

All of the following {@code printStackTrace} functionality is derived from JDK {@link Throwable} {@code printStackTrace}. In particular, the {@code Pr

@param topic @param partition @return

Attempt to fetch messages, return as soon as some messages are got. @param maxMessageCount max number of messages to return @param timeout