Thymeleaf Layoutでgroovyの警告が出る場合の対処法

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.codehaus.groovy.vmplugin.v7.Java7$1 (file:.m2/repository/org/codehaus/groovy/groovy/2.5.6/groovy-2.5.6.jar) to constructor java.lang.invoke.MethodHandles$Lookup(java.lang.Class,int)
WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.vmplugin.v7.Java7$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

        <dependency>
          <groupId>nz.net.ultraq.thymeleaf</groupId>
          <artifactId>thymeleaf-layout-dialect</artifactId>
          <exclusions>
            <exclusion>
                <groupId>org.codehaus.groovy</groupId>
                <artifactId>groovy</artifactId>
            </exclusion>
          </exclusions>
        </dependency>

        <!-- TODO 正式リリース待ち -->
        <dependency>
            <groupId>org.codehaus.groovy</groupId>
            <artifactId>groovy</artifactId>
            <version>3.0.0-beta-1</version>
        </dependency>