UnknownHostException @ Tomcat

#vim /etc/hosts

--
192.168.0.100 hostname
--

Protocol Analyzer in CUI

For CUI protocol analyzer,

#apt-get install tshark
#tshark -i eth0 -w `date "+%Y%m%d_capture.pcap"` -R "tcp.port==8080"

-w : output file
-R : filter

Maven with Eclipse A-Z

The simplest A-Z for Maven with Eclipse.

$mvn archetype:create -DgroupId=xx.xx.XX -DartifactId=AppName -Dversion=0.0.1
$mvn eclipse:add-maven-repo -Declipse.workspace=/home/user/workspace
#Move to the project root folder, then..
$mvn eclipse:eclipse -DdownloadSources=true

It's done. Then import the project from the Eclipse and enjoy ;-)

AccessControlException By Java

When you deploy the contents you might face the AccessControlException which is cased by java security manager. By Ubuntu packaged tomcat5.5, you can edit the policy file.

$sudo vim /etc/tomcat5.5/policy.d/99examples.policy

grant codeBase "file:${catalina.home}/webapps/gprs/-" {
        permission java.security.AllPermission;
}

The example above is the most loose security setting.

Hibernate cfg.xml file

hibernate.cfg.xml file not found issue is the one which troubles us often when we create the web app with hibernate. Here is the workaround code for this issue.

File file=
new File(getServletContext().getRealPath("/WEB-INF/classes/hibernate.cfg.xml"));
SessionFactory sessionFactory =
new Configuration().configure(file).buildSessionFactory();

Ubuntu Java configuration

In case you need to change the version of java runtime environment which has been installed on you machine. It's simple as this,

$  sudo /usr/sbin/update-alternatives  --config   java

Ubuntu Default editor change

sudo update-alternatives --config editor

Ubuntu cron

Crontab on Ubuntu doesn't work with normal grammer. You need to add.

SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin

command > /dev/null 2>&1

Maven2 with Hibernate

Maven cannot solve the dependency regarding jta as it is released by Sun and based upon their binary license it cannot be deployed on the maven repository.

You will see something like this below.

1) javax.transaction:jta:jar:1.0.1B
  Try downloading the file manually from: 
      http://java.sun.com/products/jta
  Then, install it using the command: 
      mvn install:install-file -DgroupId=javax.transaction -DartifactId=jta \
          -Dversion=1.0.1B -Dpackaging=jar -Dfile=/path/to/file
  Path to dependency: 
   1) RssUpdater:RssUpdater:package:0.0.1
   2) org.hibernate:hibernate:jar:3.2.4.ga
   3) javax.transaction:jta:jar:1.0.1B
1 required artifact is missing.
for artifact: 
  RssUpdater:RssUpdater:package:0.0.1
from the specified remote repositories:
  codehaus.org (http://snapshots.repository.codehaus.org/org/codehaus/mojo/),
  maven.seasar.org (http://maven.seasar.org/maven2),
  central (http://repo1.maven.org/maven2)

In order to avoid this, download jta and deploy it onto your local maven repos.

mvn install:install-file \
  -Dfile=./jta-1_0_1B-classes.zip \
  -DgroupId=javax.transaction \
  -DartifactId=jta -Dversion=1.0.1B \
  -Dpackaging=jar

Ubuntu webdav

The problem probably you face as followed.

[Sat May 19 13:20:21 2007] [notice]
Apache/2.2.3 (Ubuntu) DAV/2 PHP/5.2.1 configured 
-- resuming normal operations
[Sat May 19 13:20:53 2007] [error] [client xx.xxx.xxx.xx]
Could not DELETE /davhome/show.txt due to a failed precondition 
(e.g. locks).  [500, #0]
[Sat May 19 13:20:53 2007] [error] [client xx.xxx.xxx.xx]
The locks could not be queried for verification against a possible 
"If:" header.  [500, #0]
[Sat May 19 13:20:53 2007] [error] [client xx.xxx.xxx.xx]
Could not open the lock database.  [500, #400]
[Sat May 19 13:20:53 2007] [error] [client xx.xxx.xxx.xx]
(13)Permission denied: Could not open property database.  [500, #1]

Then..

$ sudo touch /var/lock/apache2/DAVLock
$ sudo chown www-data /var/lock/apache2/DAVLock

NW setting of Ubuntu on VMPlayer

This is small note of how to set network setting of "vmx" for Ubuntu as it didn't work at the original one.

#ethernet0.virtualDev = "vmxnet" <- Comment this line as it doesn't recognize device.
ethernet0.virtualDev = "e1000"

Then

#vim /etc/network/interface
auto eth0
iface eth0 inet dhcp