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try {
  //...
}catch(IOException ioe) { /* ignore */ }

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Printing the exception's stack trace can be useful for debugging but is equivalent to ignoring the exception, as this noncompliant code example demonstrates.

try {
  //...
}catch(IOException ioe) { ioe.printStacktrace(); }

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try {
  // Requested file does not exist
}catch(IOException) { /* ask the user for a different filename */ }

Although, not explicitly required by this recommendation, failure tolerant systems must also catch and handle unexpected unchecked exceptions resulting from programming errors. In all other cases, refrain from using the {{throws}} clause to force the client into dealing with unchecked exceptions \[[Bloch 08|AA. Java References#Bloch 08]\].

Exceptions

EX1: It is reasonable to ignore an exception which that occurs within a catch or finally block, such as while trying to close when closing a FileInputStream object.

EX2: It is also permissible to ignore the exception when the client cannot be expected to recover from the exception easily.

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