Java on ubuntu

How to find out version:

update-java-alternatives -l java -showversion java -version

How to install java8 sudo add-apt-repository ppa:openjdk-r/ppa sudo apt-get update sudo apt-get install openjdk-8-jdk sudo update-alternatives --config java sudo update-alternatives --config javac And from oracle $ sudo add-apt-repository ppa:webupd8team/java $ sudo apt-get update $ sudo apt-get install oracle-java8-installer How to remove

sudo apt-get purge openjdk-7-*

How to install: sudo apt-get install openjdk-7-jre or sudo apt-get install openjdk-7-jdk

Ubuntu Digikam MenuBar dissapear

Ctrl M

Locally installed phpmyadmin on ubuntu 12.04

403 Forbidden You don't have permission to access /phpmyadmin on this server. Apache/2.2.22 (Ubuntu) Server at localhost Port 80 ------------------------- Solution: sudo gedit /etc/phpmyadmin/apache.conf Options FollowSymLinks DirectoryIndex index.php Order deny,allow Deny from all Allow from 127.0.1.1/255.255.0.0 #Allow from 192.168.0.0/255.255.0.0

Ubuntu: how to find a file by name and date?

Just an example:

find /home/zbyszek/data/backup/ -newermt "2004-01-01 00:00:00" ! -newermt "2008-01-01 00:00:00" -name *.mp3

Eclipse Maven project: how to change web.xml version from 2.3 to 3.1

1. Modify pom.xml:

        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
        </plugins>

2. Update Maven project ( alt-F5 ).

You should have Project->Properties->Project Facets->Java->1.7
If you got errors, you should correct  Project->Properties->Java Build Path->Libraries

3. Modify web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    id="WebApp_ID" version="3.1">
    <!-- your web.xml content here -->
    <display-name>Archetype Created Web Application</display-name>
</web-app>

4. Update Maven project ( alt-F5 ).

If you get errors. Go to step 5.

5. (Most interesting!)  Modify org.eclipse.wst.common.project.facet.core.xml

5.1. Evoke: Window>Show View>Other>General>Navigator
5.2.  Navigate to: org.eclipse.wst.common.project.facet.core.xml
5.3. Modify line: <installed facet="jst.web" version="2.3"/> to
<installed facet="jst.web" version="3.1"/>
5.4. Save changes.

6. Update Maven project ( alt-F5 ).

 

Text align in callibre ebook reader

Example is here.

You need put this code in: Preferences>User Stylesheet

body {

text-align:justify !important;

text-indent:2em !important;

}

Ho to set a new context path for webapp in Eclipse Kepler

Right click on project, then:
->Properties->Web Project Settings->Context root:

If you are building war for glassfish through maven (mvn package), you may create file glassfish-web.xml in the same folder as web.xml and write down:
<!DOCTYPE glassfish-web-app PUBLIC "-//GlassFish.org//DTD GlassFish Application Server 3.1 Servlet 3.0//EN" "http://glassfish.org/dtds/glassfish-web-app_3_0-1.dtd">
<glassfish-web-app error-url="">
<!-- Doesn't work when build with Eclipse -->
    <context-root>/YourContextPath</context-root>
</glassfish-web-app>