Validation groups can be used to control which rules validation rules to run. A validation group can be identified by any Java interface (not class!). Multiple validation groups may be specified when validating. In this example, I added a validation group named MyValidationGroup ( src/main/java/com/example/MyValidationGroup.java in Maven project): package com.example; public interface MyVal... and added a @Size rule for a person's name, because my database can only store up to 15 characters for a person's name: package com.example; import javax.validatio... Now validate Person with a JUnit test ( src/test/java/com/example/TestPersonWithGroup.java in Maven project): package com.example; import java.util.Set; ... Test with " mvn clean test ". The rules where groups is not specified, which belong to the javax.validation.groups.Default group, are not executed with these tests.

In this simple example, I create a simple validating bean and create a JUnit test to test the validation. The bean ( src/main/java/com/example/Person.java ): package com.example; import javax.validatio... The test ( src/test/java/com/example/TestPerson.java ): package com.example; import java.util.Set; ... Run the test: mvn clean test You'll notice that one test passed and the other failed. The tests require that a person must have a name and the name cannot be empty, so @NotNull is not the right rule to use here. To make sure that the name is not empty, we need to use @Pattern . But since a null String matches any pattern, @NotNull is also needed: package com.example; import javax.validatio...

When a certificate is "untrusted" by IE (such as a self-signed certificate), it displays a "Certificate error" icon next to the address bar. It used to be that you can click on that icon, "View certificates", then install it. On Windows 7, because of UAC , the "Install Certificate..." button is no longer displayed. In order to see the button, you have to start IE9 with administrator privileges: right click on the IE9 shortcut icon and select " Run as administrator... ". To save the certificate to a file, click the Details tab on the Certificate dialog, then click " Copy to File... ".

Here are some ways to run a main method using Maven: Use the exec plugin: mvn exec:java -Dexec.mainClass="com.example.App" or, with arguments: mvn exec:java -Dexec.mainClass="com.example.App" -... Attach it to a build phase with the build element: <build> <plugins> <plugin> ... If you want to run main from Maven, it's probably just some test code. You are better off just to write a test case, or call the main method from a test class: package com.example; import junit.framework...

Microsoft provides free downloadable Windows images to support IE browser compatibility testing, just google Internet Explorer Application Compatibility VPC Image . These VMs run on Microsoft's Windows Virtual PC . According to MS: You can technically have a base image which never expires although you will never be able to permanently save any changes on these images for longer than 90 days.

An alias defined in .profile does not work when you open a bash window from the desktop. Simply put, alias should be put in .bashrc ; PATH should be put in .profile . These are the facts: .profile is executed by the login shell, i.e., when you login. .bashrc is executed whenever a bash shell is opened - login or non-login. When you open a new bash window from the desktop, a non-login shell is created, it will execute .bashrc , not .profile . When you ssh to a remote system interactively, a login shell is created. When you ssh to a remote system and run a command directly, a non-login shell is created. PATH modifications should be put in .profile since it is usually...

These are the steps to install the Oracle sqlplus command line utility on Ubuntu Linux: Get Oracle instant client packages from Oracle (you'll need basic or basiclite + sqlplus). Install the RPM files with alien : $ sudo alien -i oracle-instantclient11.2-basic-11.... Install Oracle shared libraries: create file /etc/ld.so.conf.d/oracle.conf and add this line: /usr/lib/oracle/11.2/client/lib then run sudo ldconfig

Here are some ways to add shared libraries to the Linux loader search path: Copy the library to one of the standard paths (for example, /usr/lib ), then run ldconfig Add the path to /etc/ld.so.conf , then run ldconfig (for details, man ldconfig ). Use the environment variable LD_LIBRARY_PATH .

The MIPS CPU is able to run both big-endian and little-endian. So a system built on MIPS can be either big-endian (mips) or little-endian (mipsel). The file command shows the architecture: $ file ls ls: ELF 32-bit LSB executable, MIPS, ... but readelf will tell the endianness: $ readelf -h ls ELF Header: Magic: 7f 45...

Tomcat allows you to create multiple server instances for the same installation. The installation directory is identified as CATALINA_HOME , the instance directory is identified as CATALINA_BASE . Here are the steps: Create a base directory for the new instance, for example: /home/nogeek/tomcat1 . Create the subdirectories: mkdir -p /home/nogeek/tomcat/{bin,conf,logs,temp,w... Copy web.xml from the installation directory: cp $CATALINA_HOME/conf/web.xml /home/nogeek/tomcat... Copy logging.properties from the installation directory: cp $CATALINA_HOME/conf/logging.properties /home/no... Create server.xml under tomcat1/conf : <?xml version='1.0' encoding='utf-8'?> <Server ... Create script setenv.sh under tomcat1/bin : # Edit this file to set custom options # Tomcat... Copy startup.sh and shutdown.sh from the installation directory. Add the following two lines to the beginning of each: CATALINA_BASE=/home/nogeek/tomcat1 export CATAL... Create a soft link for catalina.sh in tomcat1/bin : $ ln -s ~/apache-tomcat-7.0.22/bin/catalina.sh cat...