How to create a new project using apache maven 3.5.2

I just installed apache-maven-3.5.2 and oh boy creating a project seems very difficult. Specially if you are new. It seems it's not possible to create a new project according to the quick start tutorials.

xx> mvn -B archetype:generate -DarchetypeGroupId=org.apache.maven.archetypes -Dgroup
Id=com.mycompany.app -DartifactId=my-app
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.086 s
[INFO] Finished at: 2017-10-31T11:44:26+07:00
[INFO] Final Memory: 4M/15M
[INFO] ------------------------------------------------------------------------
[ERROR] The goal you specified requires a project to execute but there is no POM in this directory (xxx). Please verify you invoked Maven from the correct directory. -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MissingProjectException


Instead, try this

mvn -B archetype:generate -DinteractiveMode=true

How to check the Android SIM count

getprop ro.multisim.simslotcount

or

SystemProperties.getInt("ro.multisim.simslotcount", 1) > 1

How to detect Dual SIM using Android shell ?

getprop persist.radio.multisim.config returns "dsds" or "dsda"   on multi sim Samsung devices

source: https://android.googlesource.com/platform/frameworks/base/+/master/telephony/java/com/android/internal/telephony/TelephonyProperties.java


    public static Boolean isDualSimModel() {
        return (Boolean.valueOf("dsds".equals(SystemProperties.get("persist.radio.multisim.config")))                    Boolean.valueOf("dsda".equals(SystemProperties.get("persist.radio.multisim.config"))));
    }

How to get all Android system properties ?

here is the magic command

getprop

How to dump android processes with thread ids and names

Here is the magic command

ps -t -p

How to install letsencrypt ssl certificate on nginx without Unable to locate package letsencrypt error

Today, I thought of moving some of the websites to ssl. so I looked up for a guide on Google and most of them says

sudo apt-get install letsencrypt


but it ends with

E: Unable to locate package letsencrypt

So, I had to go back to the original repo to fix this problem.


git clone https://github.com/letsencrypt/letsencrypt
cd letsencrypt
./letsencrypt-auto --help

this will show the help. If you are trying to configure to run on nginx.

 sudo ./letsencrypt-auto --nginx

and then select the website number. Make sure you do not have anything running on port 443 now.