what triggers the inclusion of ehcache-1.1.jar in my war fil?

[Marco Mistroni]

hi all,
i have a webapp built on top of two projects,  a backend projet which uses
spring and hibernate, and
a webproject done using webwork which uses backend to connect to the
database...

somehow, in my web-inf\lib  directory an ehcache-1.1.jar is included, and i
cannot find out why
it gets included, or which dependency triggers its inclusion..
the problem i am having is that i plan to use acegisecurity in my app, and
acegi requires ehcache-1.2.3..
so i will end up having two versions of ehcache which will make my app blow
up at runtime

if anyone has experienced this, could you pls tell me which is the
dependency that triggers the inclusion
of ehcache-1.1?

here's are my dependencies of both projects..

*** backend ****
<dependencies>
   <dependency>
     <groupId>junit</groupId>
     <artifactId>junit</artifactId>
   </dependency>
   <dependency>
     <groupId>commons-logging</groupId>
     <artifactId>commons-logging</artifactId>
     <version>1.1</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring</artifactId>
   </dependency>
   <dependency>
     <groupId>hibernate</groupId>
     <artifactId>hibernate</artifactId>
     <version>3.1rc2</version>
   </dependency>
   <dependency>
     <groupId>springframework</groupId>
     <artifactId>spring-mock</artifactId>
   </dependency>
   <dependency>
          <groupId>geronimo-spec</groupId>
          <artifactId>geronimo-spec-j2ee-jacc</artifactId>
          <version>1.0-rc1</version>
   </dependency>
   <dependency>
          <groupId>javax.mail</groupId>
          <artifactId>mail</artifactId>
          <version>1.4</version>
   </dependency>

   <dependency>
        <groupId>hsqldb</groupId>
        <artifactId>hsqldb</artifactId>
        <version>1.8.0.4</version>
   </dependency>

   <dependency>
        <groupId>dbunit</groupId>
        <artifactId>dbunit</artifactId>
        <version>2.1</version>
   </dependency>


 </dependencies>

**** webwork *****
<dependencies>
   <dependency>
     <groupId>junit</groupId>
     <artifactId>junit</artifactId>
   </dependency>
   <dependency>
     <groupId>opensymphony</groupId>
     <artifactId>webwork</artifactId>
     <version>2.2.5</version>
   </dependency>
   <dependency>
     <groupId>opensymphony</groupId>
     <artifactId>sitemesh</artifactId>
     <version>2.3</version>
   </dependency>
   <dependency>
     <groupId>log4j</groupId>
     <artifactId>log4j</artifactId>
   </dependency>
   <dependency>
     <groupId>javax.servlet</groupId>
     <artifactId>servlet-api</artifactId>
     <version>2.4</version>
     <scope>provided</scope>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring</artifactId>
   </dependency>
   <dependency>
     <groupId>springframework</groupId>
     <artifactId>spring-mock</artifactId>
   </dependency>
   <dependency>
     <groupId>commons-logging</groupId>
     <artifactId>commons-logging</artifactId>
     <version>1.0.3</version>
   </dependency>
   <dependency>
     <groupId>commons-lang</groupId>
     <artifactId>commons-lang</artifactId>
     <version>2.3</version>
   </dependency>

   <dependency>
     <groupId>commons-collections</groupId>
     <artifactId>commons-collections</artifactId>
     <version>3.0</version>
   </dependency>
   <dependency>
     <groupId>commons-beanutils</groupId>
     <artifactId>commons-beanutils</artifactId>
     <version>1.7.0</version>
   </dependency>

   <dependency>
     <groupId>jstl</groupId>
     <artifactId>jstl</artifactId>
     <version>1.1.2</version>
   </dependency>
   <dependency>
     <groupId>taglibs</groupId>
     <artifactId>standard</artifactId>
     <version>1.1.2</version>
   </dependency>
   <dependency>
     <groupId>freemarker</groupId>
     <artifactId>freemarker</artifactId>
     <version>2.3.9</version>
   </dependency>
   <dependency>
     <groupId>velocity</groupId>
     <artifactId>velocity</artifactId>
     <version>1.4-rc1</version>
   </dependency>
   <dependency>
     <groupId>velocity-tools</groupId>
     <artifactId>velocity-tools</artifactId>
     <version>1.2</version>
   </dependency>
   <dependency>
     <groupId>velocity-tools</groupId>
     <artifactId>velocity-tools-view</artifactId>
     <version>1.2</version>
   </dependency>
   <dependency>
     <groupId>velocity</groupId>
     <artifactId>velocity</artifactId>
     <version>1.4</version>
   </dependency>
   <dependency>
     <groupId>jmock</groupId>
     <artifactId>jmock</artifactId>
     <version>1.2.0</version>
   </dependency>
   <dependency>
     <groupId>WebWork</groupId>
     <artifactId>WebWorkBackend</artifactId>
     <version>1.0-SNAPSHOT</version>
     <scope>compile</scope>
   </dependency>
   <dependency>
     <groupId>dwr</groupId>
     <artifactId>dwr</artifactId>
     <version>2.0</version>
   </dependency>
   <dependency>
     <groupId>ajaxtags</groupId>
     <artifactId>ajaxtags</artifactId>
     <version>1.3-beta-rc4</version>
    </dependency>
    <dependency>
     <groupId>jericho-html</groupId>
     <artifactId>jericho-html</artifactId>
     <version>2.4</version>
    </dependency>


thanks in advance and regards
marco