Filtering failling should be configurable
-----------------------------------------

                 Key: MWAR-177
                 URL: http://jira.codehaus.org/browse/MWAR-177
             Project: Maven 2.x War Plugin
          Issue Type: Improvement
    Affects Versions: 2.1-alpha-2
         Environment: Ubuntu 8.10 x64
Java JDK 1.5
            Reporter: Jorge Morales Pou


When performing filtering, people usually have a filter override methodology, 
where there is a default values in a filter file, and filters can be overriden 
including a filter file in project wc.
For example, I have this pom, for filtering my web.xml:
{quote}
      <plugin>
        <!--  This plugin enables filtering of web.xml based on properties 
defined in build.properties -->
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.1-alpha-2</version>
        <configuration>
          <filters>
            <filter>build.properties</filter>
            <filter>build.default.properties</filter>
          </filters>
          <filteringDeploymentDescriptors>true</filteringDeploymentDescriptors>
        </configuration>
      </plugin>
{quote}

I only want to upload to my VCS the build.default.properties, for default 
properties, and in my WC I want to have a build.properties, with overriden 
properties. This file should be optional, and excluded from VCS. Now CI is 
going to fail if this file doesn't exist, with such a message:
{quote}
[ERROR] fail to build filering wrappers Error loading property file 
'build.properties'
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Error loading property file 'build.properties'
{quote}

What I propose is issuing a warning if filter file is not present, on some 
filter files, something like:
{quote}
      <plugin>
        <!--  This plugin enables filtering of web.xml based on properties 
defined in build.properties -->
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.1-alpha-2</version>
        <configuration>
          <optionalFilters>
            <optionalFilter>build.properties</optionalFilter>
          </optionalFilters>
          <filters>
            <filter>build.default.properties</filter>
          </filters>
          <filteringDeploymentDescriptors>true</filteringDeploymentDescriptors>
        </configuration>
      </plugin>
{quote}

or something like:

{quote}
      <plugin>
        <!--  This plugin enables filtering of web.xml based on properties 
defined in build.properties -->
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.1-alpha-2</version>
        <configuration>
          <failOnMissingFilter>false</failOnMissingFilter>
          <filters>
            <filter>build.properties</filter>
            <filter>build.default.properties</filter>
          </filters>
          <filteringDeploymentDescriptors>true</filteringDeploymentDescriptors>
        </configuration>
      </plugin>
{quote}


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