Java 无法初始化类com.amazonaws.services.s3.AmazonS3Client

我正在Eclipse中构建一个AmazonS3测试项目（JSP Web应用程序），并尝试运行它

<%@ page import="java.io.*,
java.io.ByteArrayInputStream,
java.io.File,
java.io.InputStream,
java.util.List,
com.amazonaws.auth.AWSCredentials,
com.amazonaws.auth.BasicAWSCredentials,
com.amazonaws.services.s3.AmazonS3,
com.amazonaws.services.s3.AmazonS3Client,
com.amazonaws.services.s3.model.Bucket,
com.amazonaws.services.s3.model.CannedAccessControlList,
com.amazonaws.services.s3.model.ObjectMetadata,
com.amazonaws.services.s3.model.PutObjectRequest,
com.amazonaws.services.s3.model.S3ObjectSummary"
%>
<%
            String SUFFIX = "/";            
            // credentials object identifying user for authentication
            // user must have AWSConnector and AmazonS3FullAccess for 
            // this example to work
            AWSCredentials credentials = new BasicAWSCredentials(
                    "xxxxxxxxxxxxxxxx", 
                    "yyyyyyyyyyyyyyyyyyyyy");

            // create a client connection based on credentials
            AmazonS3 s3client = new AmazonS3Client(credentials);



%>

无法初始化引用此行代码的类错误

AmazonS3 s3client = new AmazonS3Client(credentials);

我怎么修理它

AmazonS3 s3client = new AmazonS3Client(credentials);