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+package shilla;%0A%0Aimport org.apache.commons.lang3.StringUtils;%0A%0Aimport java.io.Serializable;%0A%0Apublic class Function implements Serializable %7B%0A%0A    boolean evaluate(Object value) %7B%0A        // MVEL%EB%A1%9C evaluate%0A        return !StringUtils.isEmpty(value + %22%22);%0A    %7D%0A%7D%0A

Create Function.java