Monthly Archives: July 2009

m2eclipse and separate output folders

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The recent versions of m2eclipse (> 0.9.3) are a nightmare to get working. The biggest issues is that if you run a command line build whilst eclipse is working, one or the other will get totally borked. there is a section in the FAQ describing how to use separate output folders. Essentially you have to tell eclipse to use a certain maven profile, which changes your project configuration.

The instructions almost work. However, some plugins need the project.build.directory variable (for example for code-generation) to be set, and the FAQ does not achieve that.

Ordinarily you would have to specify the directory element in the build section:

<directory>${basedir}/${target.dir}</directory>

If you do this however, anything you launch in eclipse will not have the correct classpath. You must fully specify the output directories:

<directory>${basedir}/${target.dir}</directory>
<outputDirectory>${basedir}/${target.dir}/classes</outputDirectory>
<testOutputDirectory>${basedir}/${target.dir}/test-classes</testOutputDirectory>

I assume this is because m2eclipse is doing some kind of parsing of the pom.xml

Maven Default Execution Ids

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Maven execution IDs have changed in maven versions greater than 2.2.0.

It seems that you can disable a default a default execution by binding it to the phase “none”:

<plugin>
   <groupId>org.apache.maven.plugins</groupId>
   <artifactId>maven-dependency-plugin</artifactId>
   <executions>
      <execution>
         <id>default</id>
         <goals>
            <goal>unpack</goal>
         </goals>
         <phase>none</phase>
      </execution>
      <execution>
         <id>unpack</id>
         <phase>process-resources</phase>
         <goals>
            <goal>unpack</goal>
         </goals>
         <configuration>
            <artifactItems>
               <artifactItem>
                  [...]
               </artifactItem>
            </artifactItems>
         </configuration>
      </execution>
   </executions>
</plugin>

Linked Folders in Eclipse

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In your .project file:

<projectDescription>
   [...]
   <linkedResources>
      <link>
         <name>target</name>
         <type>2</type>
         <locationURI>some/location</locationURI>
      </link>
   </linkedResources>
</projectDescription>

Following Redirects in Jersey REST Client

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There is a method in com.sun.jersey.api.client.Client that causes the Client to follow any redirections:

 /**
  * Set if redirection should be performed or not.
  *
  * This method is the functional equivalent to setting the property
  * {@link ClientConfig#PROPERTY_FOLLOW_REDIRECTS} on the property bag
  * returned from {@link #getProperties}
  *
  * @param redirect if true then the client will automatically redirect
  *        to the URI declared in 3xx responses.
  */
 void setFollowRedirects(Boolean redirect)

Backup MySql

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Give permissions for every database to the backup user (you might not need lock tables).

GRANT SELECT, LOCK TABLES ON *.* 
     TO backupuser@host IDENTIFIED BY 'password';
dbUser=
dbHost=
dbPass=
 
for db in $(mysql --user=$dbUser --host=$dbHost \
                  --password=$dbPass -Bse 'show databases')
do
   backupFile=sql/$db.$(date +%F)-$(date +"%T").sql.gz
   mysqldump --add-drop-database --user=$dbUser \
             --host=$dbHost --password=$dbPass  \
             $db | gzip -9 > $backupFile
done

WordPress and MySQL

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<?php
define('DB_NAME', 'username');
define('DB_USER', 'username');
define('DB_PASSWORD', 'password');
define('DB_HOST', 'sqlhost');
 
$table_prefix  = 'wp_';
 
$server = DB_HOST;
$loginsql = DB_USER;
$passsql = DB_PASSWORD;
$base = DB_NAME;
?>
CREATE DATABASE username;
GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP,ALTER
   ON username.* TO username@webhost IDENTIFIED BY 'password';
FLUSH PRIVILEGES;

Bug in HTTPBasicAuthFilter

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com.sun.jersey.api.client.filter.HTTPBasicAuthFilter incorrectly pads the Base64 encoded strings with null characters, instead of ‘=’. jersey-client-1.0.3.jar

It might be better to use a pre-exisiting Base64 library. Like the one in CommonsCodec.

public class HttpBasicFilter extends ClientFilter
{
   private static final String c_base64code = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
                                              "abcdefghijklmnopqrstuvwxyz0123456789+/";
 
   private final String m_authentication;
 
   /**
    * Adds an authentication header using a username and password
    *
    * @param username the user name to send
    * @param password the passowrd to send
    */
   public HttpBasicFilter(final String username, final String password)
   {
      m_authentication = "Basic " + encode(username + ":" + password);
   }
 
   private String encode(final String string)
   {
      byte[] bytes = getBytes(string);
      final int padding = (3 - (bytes.length % 3)) % 3;
 
      bytes = zeroPad(bytes.length + padding, bytes);
 
      final StringBuilder encoded = new StringBuilder();
      for (int i = 0; i &lt; bytes.length; i += 3)
      {
         final int threeBytes = (bytes[i] &lt;&lt; 16) + (bytes[i + 1] &lt;&lt; 8) + bytes[i + 2];
         encoded.append(c_base64code.charAt((threeBytes &gt;&gt; 18) &amp; 0x3f)).
                 append(c_base64code.charAt((threeBytes &gt;&gt; 12) &amp; 0x3f)).
                 append(c_base64code.charAt((threeBytes &gt;&gt; 6) &amp; 0x3f)).
                 append(c_base64code.charAt(threeBytes &amp; 0x3f));
      }
      return encoded.substring(0, encoded.length() - padding) + "==".substring(0, padding);
   }
 
   private byte[] getBytes(final String string)
   {
      byte[] bytes;
      try
      {
         bytes = string.getBytes("UTF-8");
      }
      catch (final UnsupportedEncodingException e)
      {
         g_logger.log(Level.WARNING, "unable to decode string as UTF-8", e);
         bytes = string.getBytes();
      }
      return bytes;
   }
 
   private byte[] zeroPad(final int length, final byte[] bytes)
   {
      final byte[] padded = new byte[length];
      System.arraycopy(bytes, 0, padded, 0, bytes.length);
      return padded;
   }
 
   /**
    * {@inheritDoc}
    */
   @Override
   public ClientResponse handle(final ClientRequest request) throws ClientHandlerException
   {
      if (!request.getMetadata().containsKey(HttpHeaders.AUTHORIZATION))
      {
         request.getMetadata().add(HttpHeaders.AUTHORIZATION, m_authentication);
      }
      return getNext().handle(request);
   }
}