Warning on startup

[OLibutzki]

Pcap4J reports warnings while starting:
2016-11-13 08:51:34.636 [WARN ] [org.pcap4j.util.PropertiesLoader ] - [org/pcap4j/pcap4j.properties] Could not get value by org.pcap4j.af.inet, use default value: null 2016-11-13 08:51:34.640 [WARN ] [org.pcap4j.util.PropertiesLoader ] - [org/pcap4j/pcap4j.properties] Could not get value by org.pcap4j.af.inet6, use default value: null 2016-11-13 08:51:34.640 [WARN ] [org.pcap4j.util.PropertiesLoader ] - [org/pcap4j/pcap4j.properties] Could not get value by org.pcap4j.af.packet, use default value: null 2016-11-13 08:51:34.641 [WARN ] [org.pcap4j.util.PropertiesLoader ] - [org/pcap4j/pcap4j.properties] Could not get value by org.pcap4j.af.link, use default value: null 2016-11-13 08:51:34.790 [WARN ] [org.pcap4j.util.PropertiesLoader ] - [org/pcap4j/pcap4j.properties] Could not get value by org.pcap4j.dlt.raw, use default value: null

How can I get rid of these warnings without changing the log level?

[kaitoy]

Set the following system properties before starting a packet capture.

• org.pcap4j.af.inet to 2
• org.pcap4j.af.inet6 to
  • 30 if on OSX
  • 28 if on FreeBSD
  • 10 if on Linux
  • 23 otherwise
• org.pcap4j.af.packet to 17
• org.pcap4j.af.link to 18
• org.pcap4j.dlt.raw to
  • 14 if on OpenBSD
  • 12 otherwise

I will change the logs from WARN to INFO in the next version.

[michaelkoetter]

Could this be set automatically in a static block in org.pcap4j.core.Pcaps maybe?
I'd be happy to create a pull request if you think it would be useful :)

[kaitoy]

I think org.pcap4j.Pcap4jPropertiesLoader should be modified such that its methods use proper default values for loader.getInteger instead of null, rather than setting the system properties.
Also org.pcap4j.util.PropertiesLoader.PropertiesLoader should be changed to log messages with info instead of warn when it uses a default value.
Anyway, pull requests are always useful and helpful.

[kaitoy]

Merged #78

[zayeed91]

Hi Kaitoy
I want to stop that slf4j logs on your library:

Oct 16, 2018 4:48:05 PM org.pcap4j.util.PropertiesLoader getBoolean
INFO: [org/pcap4j/packet/packet.properties] Got"true" which means true by org.pcap4j.packet.udpV4.calcChecksumAtBuild
Oct 16, 2018 4:48:05 PM org.pcap4j.util.PropertiesLoader getBoolean
INFO: [org/pcap4j/packet/packet.properties] Got"true" which means true by org.pcap4j.packet.ipV4.calcChecksumAtBuild
Oct 16, 2018 4:48:05 PM org.pcap4j.core.NativeMappings
INFO: Pcap4J successfully loaded a native pcap library: libpcap version 1.8.1
Oct 16, 2018 4:48:06 PM org.pcap4j.util.PropertiesLoader getInteger
INFO: [org/pcap4j/pcap4j.properties] Could not get value by org.pcap4j.af.inet, use default value: 2
Oct 16, 2018 4:48:06 PM org.pcap4j.util.PropertiesLoader getInteger
INFO: [org/pcap4j/pcap4j.properties] Could not get value by org.pcap4j.af.inet6, use default value: 10
Oct 16, 2018 4:48:06 PM org.pcap4j.util.PropertiesLoader getInteger
INFO: [org/pcap4j/pcap4j.properties] Could not get value by org.pcap4j.af.packet, use default value: 17
Oct 16, 2018 4:48:06 PM org.pcap4j.util.PropertiesLoader getInteger
INFO: [org/pcap4j/pcap4j.properties] Could not get value by org.pcap4j.af.link, use default value: 18
Oct 16, 2018 4:48:06 PM org.pcap4j.core.Pcaps findAllDevs
INFO: 8 NIF(s) found.
Oct 16, 2018 4:48:06 PM org.pcap4j.util.PropertiesLoader getInteger
INFO: [org/pcap4j/pcap4j.properties] Could not get value by org.pcap4j.dlt.raw, use default value: 12

Please help me.

Thanks
Zayeed

[kaitoy]

Pcap 4J's logs should be transferred to your logging library (e.g. logback) via SLF4J. Please refer to the logging library's document for information about controlling logs.