is it ok to remove derby dependency?

[Shailesh Mangal]

We use mysql for persistance. Is it ok to exclude derby dependency  
from our pom.xml.?

                <dependency>
                        <groupId>org.apache.jackrabbit</groupId>
                        <artifactId>jackrabbit-core</artifactId>
                        <version>${jackrabbit.version}</version>
                        <exclusions>
                                <exclusion>
                                        <groupId>poi</groupId>
                                        <artifactId>poi</artifactId>
                                </exclusion>
                                <exclusion>
                                        <groupId>org.apache.derby</groupId>
                                        <artifactId>derby</artifactId>
                                </exclusion>
                        </exclusions>
                </dependency>
-Shailesh