UF.NIO
UF (Use Freed) issues are reported when there is an attempt to use resources after they were released. The UF.NIO warning indicates an attempt to use a java.nio.* object after it was closed.
Example 1
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public boolean checkMeta(ReadableByteChannel channel) {
final ByteBuffer b = ByteBuffer.allocate(8);
try {
final int i = channel.read(b);
if (i < 8) {
return false;
}
} catch (IOException e) {
return false;
} finally {
try {
channel.close();
} catch (IOException e) {
// do nothing
}
}
// Cast unsigned character constants prior to comparison
return (b.get(0) == (byte) 'm' && b.get(1) == (byte) 'y' &&
b.get(2) == (byte) 'f' && b.get(3) == (byte) 'o' &&
b.get(4) == (byte) 'r' && b.get(5) == (byte) 'm' &&
b.get(6) == (byte) 'a' && b.get(7) == (byte) 't');
}
public void printOut(final String path) throws IOException {
final ReadableByteChannel ch = new FileInputStream(path).getChannel();
if (checkMeta(ch)) {
try {
final ByteBuffer b = ByteBuffer.allocate(1024);
int i;
while ((i = ch.read(b)) > 0) {
print(b);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void print(final ByteBuffer b) {
while (b.hasRemaining()) {
System.out.print(b);
}
b.clear();
}
UF.NIO is reported for the snippet on line 45: There is an attempt to read from the channel which is closed on line 26