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Java: Replace SSA wrapper classes with shared implementation. #652

Job	Run time
Model Difference (apache/commons-fileupload)	5m 13s
Model Difference (apache/commons-beanutils)	5m 35s
Model Difference (apache/commons-logging)	5m 8s
Model Difference (apache/commons-lang)	6m 11s
Model Difference (apache/commons-io)	5m 44s
Model Difference (apache/commons-codec)	5m 27s
Model Difference (apache/commons-csv)	5m 33s
Model Difference (apache/commons-validator)	5m 13s
Model Difference (apache/dubbo)	9m 0s
	53m 4s