To generate the Java AXIS2 classes from the Amazon EC2 wsdl use the following command line, assuming source definitions in the local directory:
$ wsdl2java.sh -ss -sd -ssi -g -p com.amazon.s3 -ns2p "http://s3.amazonaws.com/doc/2006-03-01/"=com.amazon.s3 -uri cloud-AmazonS3.wsdl

This runs the wsdl2java code generation tool to produce stubs with asynchronous invocation methods, such as those useful for REST using the com.amazon.s3 package.

This creates the following java source files in the src/com/amazon/s3 subdirectory …

AccessControlList.java				ListAllMyBucketsResponse.java
AccessControlPolicy.java			ListAllMyBucketsResult.java
AmazonCustomerByEmail.java			ListBucket.java
AmazonS3CallbackHandler.java			ListBucketResponse.java
AmazonS3MessageReceiverInOut.java		ListBucketResult.java
AmazonS3Skeleton.java				ListEntry.java
AmazonS3SkeletonInterface.java			ListVersionsResponse.java
AmazonS3Stub.java				ListVersionsResult.java
BucketLoggingStatus.java			ListVersionsResultChoice_type0.java
CanonicalUser.java				LocationConstraint.java
CopyObject.java					LoggingSettings.java
CopyObjectResponse.java				MetadataDirective.java
CopyObjectResult.java				MetadataEntry.java
CreateBucket.java				MfaDeleteStatus.java
CreateBucketConfiguration.java			NotificationConfiguration.java
CreateBucketResponse.java			Payer.java
CreateBucketResult.java				Permission.java
DeleteBucket.java				PostResponse.java
DeleteBucketResponse.java			PrefixEntry.java
DeleteMarkerEntry.java				PutObject.java
DeleteObject.java				PutObjectInline.java
DeleteObjectResponse.java			PutObjectInlineResponse.java
ExtensionMapper.java				PutObjectResponse.java
GetBucketAccessControlPolicy.java		PutObjectResult.java
GetBucketAccessControlPolicyResponse.java	RequestPaymentConfiguration.java
GetBucketLoggingStatus.java			Result.java
GetBucketLoggingStatusResponse.java		SetBucketAccessControlPolicy.java
GetObject.java					SetBucketAccessControlPolicyResponse.java
GetObjectAccessControlPolicy.java		SetBucketLoggingStatus.java
GetObjectAccessControlPolicyResponse.java	SetBucketLoggingStatusResponse.java
GetObjectExtended.java				SetObjectAccessControlPolicy.java
GetObjectExtendedResponse.java			SetObjectAccessControlPolicyResponse.java
GetObjectResponse.java				Status.java
GetObjectResult.java				StorageClass.java
Grant.java					TopicConfiguration.java
Grantee.java					User.java
Group.java					VersionEntry.java
ListAllMyBuckets.java				VersioningConfiguration.java
ListAllMyBucketsEntry.java			VersioningStatus.java
ListAllMyBucketsList.java