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Java: Replace SSA wrapper classes with shared implementation. #650

Job	Run time
Model Difference (apache/dubbo)	8m 56s
Model Difference (apache/commons-csv)	5m 15s
Model Difference (apache/commons-io)	5m 39s
Model Difference (apache/commons-beanutils)	5m 21s
Model Difference (apache/commons-lang)	6m 18s
Model Difference (apache/commons-validator)	5m 17s
Model Difference (apache/commons-logging)	5m 14s
Model Difference (apache/commons-codec)	5m 37s
Model Difference (apache/commons-fileupload)	5m 18s
	52m 55s