In my domain model, the "dto" classes are all Abstract and are subclassed into business objects which is what my application manipulates and persists. In hibernate terms I have a @MappedSuperclass and an @Entity subclass.
If I make the abstract class concrete, I can serialize it to GWT without any problem. However if I serialize the subclass, the result is garbage in GWT. Specifically, my class has 2 int fields and a String. When I serialize the superclass, I correctly see a string value of "fred". However when I serialize the subclass and display the string contents it comes out as "java.lang.Integer/3438268394". To track the problem down, I wiresharked the http traffic. First the good reply then the bad. 0000 2f 2f 4f 4b 5b 31 32 33 2c 31 32 33 34 35 36 2c //OK[123,123456, 0010 33 2c 32 2c 31 2c 5b 22 63 6f 75 6b 2e 63 6c 65 3,2,1,["couk.cle 0020 76 65 72 74 68 69 6e 6b 69 6e 67 2e 74 6c 32 30 verthinking.tl20 0030 31 30 2e 73 68 61 72 65 64 2e 47 77 74 2f 31 34 10.shared.Gwt/14 0040 32 35 33 37 38 35 37 22 2c 22 63 68 61 72 22 2c 2537857","fred", 0050 22 6a 61 76 61 2e 6c 61 6e 67 2e 49 6e 74 65 67 "java.lang.Integ 0060 65 72 2f 33 34 33 38 32 36 38 33 39 34 22 5d 2c er/3438268394"], 0070 30 2c 35 5d 0,5] 0000 2f 2f 4f 4b 5b 31 32 33 2c 31 32 33 34 35 36 2c //OK[123,123456, 0010 33 2c 32 2c 31 2c 5b 22 63 6f 75 6b 2e 63 6c 65 3,2,1,["couk.cle 0020 76 65 72 74 68 69 6e 6b 69 6e 67 2e 74 6c 32 30 verthinking.tl20 0030 31 30 2e 73 68 61 72 65 64 2e 47 77 74 2f 31 36 10.shared.Gwt/16 0040 33 32 35 31 30 37 30 37 22 2c 22 63 68 61 72 22 32510707","fred" 0050 2c 22 6a 61 76 61 2e 6c 61 6e 67 2e 49 6e 74 65 ,"java.lang.Inte 0060 67 65 72 2f 33 34 33 38 32 36 38 33 39 34 22 5d ger/3438268394"] 0070 2c 30 2c 35 5d ,0,5] The bad reply (the sub-class) seems to be one byte longer. Is this enough to confuse the parser at the client? ------------------------------------------------------ http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447&dsMessageId=2622588
