Communicate with Multiple USB / Serial Port

When requirement will come to listen more than one USB / Serial Port in Java, make some changes in Java/jdk/jre/lib/javax.comm.properties file. By default the Application will listen only one port at a time but after make the changes simultaneously it'll listen multiple ports. changes need to be done: open the above mentioned file add the following line in particular section # Paths to server-side serial port devices serpath0 = /dev/ttyS0 #added.... serpath1 = /dev/ttyS1 serpath2 = /dev/ttyACM0 serpath3 = /dev/ttyACM1

Low Graphic Mode Error in Ubuntu

If the low graphic mode error comes in Ubuntu:

sudo apt-get update

sudo apt-get -d install --reinstall gdm

sudo apt-get remove --purge gdm

sudo apt-get install gdm

sudo apt-get install Ubuntu-desktop

sudo dpkg-reconfigure -phigh xserver-xorg

sudo reboot

how to start the wireless internet if the machine run in low graphic mode

when the GUI is unable to load press ALT+F2 key and open other terminal

login with credentials

type startx

type iwlist scan (for searching the network, if wireless is down then type sudo ifconfig up)

for registering with network type iwconfig essid (like interface=>ra0  essid=>“MyNetwork”).

If the above command not work then type nm-applet

Set the Java_Home and Maven M2_HOME

Write the below line in /etc/bash.bashrc

// user jdk path
JAVA_HOME=/home/test/java/jdk1.6.0_30
export JAVA_HOME
PATH=$PATH:$JAVA_HOME/bin
export PATH
PATH=$PATH:JAVA_HOME

//user maven path (expecting extract in /usr/local/apache-maven/)
M2_HOME=/usr/local/apache-maven/apache-maven-3.0.4
export M2_HOME
M2=$M2_HOME/bin
export PATH=$M2:$PATH