Java Heap Space

The issue which most developers come across is the OutOfMemory: perm space error, which usually leads to increasing the JVM's perm space, here is great explanation on the details of java heap space:

http://www.freshblurbs.com/explaining-java-lang-outofmemoryerror-permgen-space

Integrating soap ui maven plugin

What a pleasure, a way to integrate your soap ui project into a maven build :)

Just pop this into your pom.xml from where your web module is located; this will start/stop jetty for the soap ui plugin to invoke its tests:

<plugin>
               <groupId>org.mortbay.jetty</groupId>
               <artifactId>maven-jetty-plugin</artifactId>
               <version>6.1.21</version>
               <configuration>
                   <stopKey>foo</stopKey>
                   <stopPort>9999</stopPort>
                   <webAppConfig>
                       <contextPath>/test</contextPath>
                   </webAppConfig>
               </configuration>
               <executions>
                   <execution>
                       <id>start-jetty</id>
                       <phase>pre-integration-test</phase>
                       <goals>
                           <goal>run</goal>
                       </goals>
                       <configuration>
                           <scanIntervalSeconds>0</scanIntervalSeconds>
                           <daemon>true</daemon>
                       </configuration>
                   </execution>
                   <execution>
                       <id>stop-jetty</id>
                       <phase>post-integration-test</phase>
                       <goals>
                           <goal>stop</goal>
                       </goals>
                   </execution>
               </executions>
           </plugin>

And insert the soap ui plugin to invoke on inegration-test phase pointing to a valid soap ui project XML:

<plugin>
                <groupId>eviware</groupId>
                <artifactId>maven-soapui-plugin</artifactId>
                <version>3.5.1</version>
                <configuration>
                    <projectFile>${project.basedir}/soapui-project.xml
                    </projectFile>
                    <outputFolder>${project.basedir}/target/test/soapui-results</outputFolder>
                    <junitReport>true</junitReport>
                </configuration>
                <executions>
                    <execution>
                        <id>soapUI</id>
                        <phase>integration-test</phase>
                        <goals>
                            <goal>test</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

Spring LDAP

Here is a simple example on how you would retrieve a user's ldap credentials using spring ldap:
http://blog.javachap.com/index.php/ldap-user-management-with-spring-ldap/

Configure a spring ldap context source:

<bean id="contextSource" class="org.springframework.security.ldap.DefaultSpringSecurityContextSource">
       <constructor-arg value="${ldap.url}"/>
       <property name="base" value="${ldap.base}"/>
       <property name="userDn" value="${ldap.username}"/>
       <property name="password" value="${ldap.password}"/>
   </bean>

   <bean id="ldapTemplate" class="org.springframework.ldap.core.LdapTemplate">
       <constructor-arg ref="contextSource"/>
   </bean>

You can then use the ldap template to query the ldap directory and map the relevant fields:

public User getUser(String userId) {
       AndFilter filter = new AndFilter();
       filter.and(new EqualsFilter("objectclass", "person")).and(
               new EqualsFilter("uid", userId));
       List<User> users = ldapTemplate.search(DistinguishedName.EMPTY_PATH,
               filter.encode(), new AttributesMapper() {
                   public Object mapFromAttributes(Attributes attributes) throws NamingException {

                       User user = new User();
                       user.setEmail(attributes.get("mail").toString());

                       return user;
                   }
               });

       if (users.isEmpty()) {
           return null;
       }
       return users.get(0);
   }

Maven assembly plugin - create jar dependancies directory

Here is how to create a directory within a maven module containing all the dependant jars referenced by the module itself:

Put this in the pom.xml:

<build>
       <plugins>
           <plugin>
               <artifactId>maven-assembly-plugin</artifactId>
               <version>2.2.1</version>
               <executions>
                   <execution>
                       <id>distro-assembly</id>
                       <phase>package</phase>
                       <goals>
                           <goal>single</goal>
                       </goals>
                       <configuration>
                           <descriptors>
                               <descriptor>assembly/assembly.xml</descriptor>
                           </descriptors>
                       </configuration>
                   </execution>
               </executions>
           </plugin>
       </plugins>
   </build>

And then put this in assembly.xml:

<assembly>
   <id>uberjar</id>
   <formats>
       <format>dir</format>
   </formats>
   <includeBaseDirectory>false</includeBaseDirectory>
   <dependencySets>
       <dependencySet>
           <unpack>false</unpack>
           <scope>runtime</scope>
       </dependencySet>
   </dependencySets>
   <fileSets>
       <fileSet>
           <directory>${project.build.outputDirectory}</directory>
           <outputDirectory>/</outputDirectory>
       </fileSet>
   </fileSets>
</assembly>

How to get geo location in android app

A simple tip on how to get access to geo location within an android application

http://stackoverflow.com/questions/2227292/how-to-get-latitude-and-longitude-of-the-mobiledevice-in-android

Grails Maven Integration

If you want to migrate an existing grails project created with the typical 'create-app' grails tool (that by default uses Ant as build tool) to maven, u can use this command:

mvn org.grails:grails-maven-plugin:1.3.2:create-pom -DgroupId=com.mycompany

http://grails.org/doc/latest/guide/4.%20The%20Command%20Line.html#Mavenizing an existing project

Loading files from classpath

Here is a great tip for loading resources in classpath from within Java:

// From ClassLoader, all paths are "absolute" already - there's no context
// from which they could be relative. Therefore you don't need a leading slash.
InputStream in = this.getClass().getClassLoader().getResourceAsStream("SomeTextFile.txt");

// From Class, the path is relative to the package of the class unless
// you include a leading slash, so if you don't want to use the current
// package, include a slash like this:
InputStream in = this.getClass().getResourceAsStream("/SomeTextFile.txt");

//If you dont include the '/path' in the above example and the class your calling this from is in package
// com.me.happy then it will look for that resource in that package
InputStream in = this.getClass().getResourceAsStream("SomeTextFile.txt");