Connect internet when VPN

Open Network Connections Manager, choose your VPN connection, click on Routes... button

If your VPN network in 10.x.x.x you can setup like this

Disconnect VPN and reconnect, you can access internet with it.

Default iptables rules when install ireadmail

When I install iredmail, the default iptables rule file has created in /etc/default/iptables

Please careful when edit it because it can block access to your system.

Blank screen when access web admin on Payara

When you config Realm on Payara, sometimes it add default-principal="admin" into tag <security service> look like

<security-service default-principal-password="yourpasswordherer" default-principal="admin">


remove default-principal="admin" and issue will be gone

correct line:
<security-service default-principal-password="yourpasswordherer">

Good luck

WELD-001408 Unsatisfied dependencies ...

Problem

Can not deploy web application, web server raise error: WELD-001408: Unsatisfied dependencies for type SessionBean with qualifiers @Default ....

Cause

Lack of file beans.xml (I cannot why that file must exist for resolving issue). This is one of popular purposes to resolve.

Solution

Create file beans.xml and put it same location of web.xml

The content of beans.xml is:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://jboss.org/schema/cdi/beans_1_0.xsd">
   
</beans>

That's all.

Reference

http://docs.jboss.org/weld/reference/latest/en-US/html/injection.html

Some tips when install new Ubuntu 14.04 64bit

Back to Gnome Flashback

apt-get install gnome-session-flashback

Enable Logout / Shutdown / Restart button:

gsettings set com.canonical.indicator.session suppress-logout-restart-shutdown true

Install ibus-unikey
Using unity or default ubuntu interface, after install ibus-unikey success, you can change to gnome flashback

sudo apt-get install ibus-unikey
ibus restart

Install dock

sudo apt-get install plank

Edit plank config at

nano ~/.config/plank/dock1/settings

Change maximize control to right

gsettings set org.gnome.desktop.wm.preferences button-layout ':minimize,maximize,close'

Install Java
Using normal user

tar xvf jdk-7u51-linux-x64.tar.gz
mv jdk1.7.0_51 jdk1.7.0
sudo -s
mkdir /usr/lib/jvm
mv jdk1.7.0 /usr/lib/jvm/
update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0/bin/java" 1
update-alternatives --set java /usr/lib/jvm/jdk1.7.0/bin/java
nano /etc/profile

Add content below to /etc/profile

JAVA_HOME=/usr/lib/jvm/jdk1.7.0
JRE_HOME=$JAVA_HOME/jre
PATH=$JAVA_HOME/bin:$PATH
CLASSPATH=.:$JAVA_HOME/lib
MANPATH=$MANPATH:$JAVA_HOME/man
export JAVA_HOME JRE_HOME PATH CLASSPATH MANPATH

Fix Skype theme

sudo apt-get install gtk2-engines-murrine:i386 gtk2-engines-pixbuf:i386

Some problem with JavaHL (install sublipse for eclipse)

Go to Eclipse > Preferences > Team > SVN Under "SVN interface", choose client as "SVNKit(Pure Java) SVNKit v..xx". That's all.

EXP 13: disable cache feature of EclipseLink

Problem
Sometimes, I query data from database using EclipseLink. The query as below:

EntityManager em;
em.createQuery("SELECT o FROM Tbexample as o", Tbexample.class).getResultList();

I get nothing but when I access to database, some record exists in table Tbexample.

Cause
By default, EclipseLink enable caching feature. This feature help increase performance but sometimes it make difficult to control real data in database in very small time (nanosecond). So to ensure the query result show real data on table of database, you have to disable caching feature.

Solution
On persistence.xml, add the line:

<shared-cache-mode>NONE</shared-cache-mode>

On query, add the hint

EntityManager em;
em.createQuery("SELECT o FROM Tbexample as o", Tbexample.class).setHint("javax.persistence.cache.storeMode", "REFRESH").getResultList();

That's all for disable caching feature on querying.

EXP 12: add static route on linux network

Problem
Connect both wired and wifi network.

Wired for LAN and wifi for internet.

Connected to LAN but can not connect internet.

Cause
On console, type

route

Kernel IP routing table

Destination	Gateway	Genmask	Flags	Metric	Ref	Use	Iface
default	9.9.9.1	0.0.0.0	UG	0	0	0	eth0
9.9.9.0	*	255.255.255.0	U	1	0	0	eth0
10.0.0.0	*	255.0.0.0	U	2	0	0	wlan0
link-local	*	255.255.0.0	U	1000	0	0	eth0

default gateway using eth0, ip 9.9.9.1, so you can not connect internet with this.

Solution
Change default gateway from eth0 to wlan0 using static route

sudo route add -net default gw 10.128.128.128 netmask 0.0.0.0 dev wlan0 metric 0

sudo route del -net default gw 9.9.9.1 netmask 0.0.0.0 dev eth0 metric 0