Jaas does not work with macat plugin from tomcat7

I'm using JAAS for the security of my webapp . I only declare a JDBCRealm of normal Tomcat, passing the bank credentials ... it follows context.xml with the declaration of Realm:

context.xml

<?xml version='1.0' encoding='utf-8'?>
<Context>

    <WatchedResource>WEB-INF/web.xml</WatchedResource>

    <Realm className="org.apache.catalina.realm.JDBCRealm"

           driverName="com.microsoft.sqlserver.jdbc.SQLServerDriver"

           connectionURL="jdbc:sqlserver://ip:porta;databaseName=dbname;user=user;password=pass"

           userTable="user" userNameCol="username" userCredCol="pass"

           userRoleTable="roles" roleNameCol="rolename"

           digest="SHA-256"/>

</Context>

Installing Tomcat 7 in my folder and placing this context.xml in the TOMCAT7/conf/context.xml folder and placing the sql server lib in the TOMCAT7/lib, folder authentication with JAAS works normal.

When you try to use the maven plugin, authentication does not work. I did this:

<plugin>
    <groupId>org.apache.tomcat.maven</groupId>
    <artifactId>tomcat7-maven-plugin</artifactId>
    <version>2.2</version>
    <configuration>
        <port>9090</port>
        <path>/</path>
        <contextFile>src/main/resources/tomcat/context.xml</contextFile>
    </configuration>

    <dependencies>
        <dependency>
            <groupId>com.microsoft.sqlserver</groupId>
            <artifactId>mssql-jdbc</artifactId>
            <version>${mssql-jdbc.version}</version>
        </dependency>
    </dependencies>
</plugin>

I placed the same ** context.xml ** in the src / main / resources / tomcat / context.xml folder