The beginning of the payload all looks correct, and it won't be possible 
for us to fully decode it and see what is wrong without the sources of the 
various objects mentioned.
But the format *appears* to be trying to send something impossible:

7 - "current version of the stream format"
0 - "no flags enabled"
96 - "there are 96 distinct strings in this stream"
...
1 - "the moduleBaseUrl is the first string", aka 
http://vagrant.ptcnet.ptc.com:2280/Windchill/gwt/com.ptc.windchill.wncgwt.WncGWT/
2 - "the name of the serialization policy file is the second string", aka 
1C2DD3E7BC435105789300F99C966F9B
3 - "the name of the RPC interface is the third string", aka 
com.ptc.cat.ops.client.internal.OperationDispatcher
4 - "the name of the RPC method to call is the fourth string", aka 
"dispatch"
1 - "there is one argument to this method"
5 - "the class of the first argument to the method is the fifth string" aka 
java.util.ArrayList/4159755760
5 - "the class of the next object to read (i.e. the only argument to the 
dispatch() method) is the fifth string" aka java.util.ArrayList/4159755760
1 - "the array list first reads its size from the stream" aka the ArrayList 
only has one object
6 - "the class of the next object to read (the first and only object in the 
ArrayList) is the sixth string" aka 
com.ptc.windchill.enterprise.dsb.client.ops.StructureCompareOperation$StructureCompareOperationParams/619250753
7 - (now we're just guessing, since I don't have the sources for 
StructureCompareOperationParams, etc) "the class if the first field in 
StructureCompareOperationParams is the seventh string" aka 
com.extjs.gxt.ui.client.core.FastMap/3488076414
26 - "the Map_CustomFieldSerializerBase indicates that the next int is the 
count of items in the map" aka 26 items in the FastMap field of 
StructureCompareOperationParams
8 - "the first key in the map is an object with class of the 8th string", 
aka java.lang.String/2004016611 (we're probably going to see 25 more 
strings representing each key...
9 - "the first key's string value is the 9th string in the stream" aka the 
key has a value of SOURCE_NCID
8 - "the first value in the map is an object with the class of the 8th 
string", aka String again
10 - "the first value in the map is the 10th string in the stream" aka the 
value is -105227984815700591

etc. Guessing beyond this point is tedious and hazard fraught without 
concrete specifics. Some of this can be confirmed from your original stack 
trace:

Caused by: com.google.gwt.user.client.rpc.SerializationException: 
java.lang.ClassNotFoundException: 1C2DD3E7BC435105789300F99C966F9B
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserialize(ServerSerializationStreamReader.java:708)
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.
*readObject*(ServerSerializationStreamReader.java:592)
    at 
com.google.gwt.user.server.rpc.core.java.util.Arrays$ArrayList_ServerCustomFieldSerializer.instantiate(Arrays.java:71)
    at 
com.google.gwt.user.server.rpc.core.java.util.Arrays$ArrayList_ServerCustomFieldSerializer.instantiateInstance(Arrays.java:106)
    at 
com.google.gwt.user.server.rpc.core.java.util.Arrays$ArrayList_ServerCustomFieldSerializer.instantiateInstance(Arrays.java:39)
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.instantiate(ServerSerializationStreamReader.java:1088)
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserialize(ServerSerializationStreamReader.java:682)
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.
*readObject*(ServerSerializationStreamReader.java:592)
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader$ValueReader$8.readValue(ServerSerializationStreamReader.java:149)
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserializeValue(ServerSerializationStreamReader.java:434)
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserializeClass(ServerSerializationStreamReader.java:832)
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserializeImpl(ServerSerializationStreamReader.java:903)
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserializeClass(ServerSerializationStreamReader.java:861)
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserializeImpl(ServerSerializationStreamReader.java:903)
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserializeClass(ServerSerializationStreamReader.java:861)
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserializeImpl(ServerSerializationStreamReader.java:903)
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserialize(ServerSerializationStreamReader.java:687)
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.
*readObject*(ServerSerializationStreamReader.java:592)
    at 
com.google.gwt.user.server.rpc.core.java.util.Collection_ServerCustomFieldSerializerBase.deserialize(Collection_ServerCustomFieldSerializerBase.java:38)
    at 
com.google.gwt.user.server.rpc.core.java.util.ArrayList_ServerCustomFieldSerializer.deserialize(ArrayList_ServerCustomFieldSerializer.java:40)
    at 
com.google.gwt.user.server.rpc.core.java.util.ArrayList_ServerCustomFieldSerializer.deserializeInstance(ArrayList_ServerCustomFieldSerializer.java:54)
    at 
com.google.gwt.user.server.rpc.core.java.util.ArrayList_ServerCustomFieldSerializer.deserializeInstance(ArrayList_ServerCustomFieldSerializer.java:33)
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserializeImpl(ServerSerializationStreamReader.java:884)
    at 
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserialize(ServerSerializationStreamReader.java:687)
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.
*readObject*(ServerSerializationStreamReader.java:592)

Reading from the bottom, the first readObject is indeed an ArrayList, the 
second object has no custom field serializer (probably your 
StructureCompareOperationParams). Since the third readObject is an 
Arrays.ArrayList (i.e. results of Arrays.asList) instance, chances are the 
FastMap field in StructureCompareOperationParams was successfully 
deserialized, and the stream moved on to a later field in 
StructureCompareOperationParams with a List type? But as we can see here, 
whatever it attempted to deserialize at that point incorrectly pointed to 
string "2" rather than some later string, suggesting that the versions on 
client and server are either out of sync, the payload was modified 
incorrectly, there is a broken CustomFieldSerializer somewhere in your 
project or its dependencies, or somehow you've run into a bug in GWT.

There are only 5 occurences of "|2|" in your payload other than the correct 
first one, I'd imagine that one of those is suspect. or at least will point 
you in the right direction for what went wrong. Keep in mind that there is 
nothing inherently insidious about seeing a "2" - it might be the number 2, 
or the 3rd (zero indexed) value in some enum, or an indication that some 
collection has 2 items in it. It is also _very_ unlikely that some other 
string in your payload actually has that same value, but it is technically 
possible.

Using your own sources you can go over the payload to work this out, but 
focus on the failing readInt() which returns 2, and see which writeInt(2) 
on the client caused this bad data to be emitted. Given that 
GwtHandlerAdapter.processCall is custom, I'd also take a very close look 
there (or at any other proxy/filter) to see if it could possibly modify the 
payload in any way.

On Wednesday, June 27, 2018 at 2:04:08 AM UTC-5, DK wrote:
>
> *GwtHandlerAdapter* class extends the *RemoteServiceServlet* class and 
> overrides its *processCall(String payload)* method.
>
> The overriden method only throws error when the *payload value* is:
>
> 7|0|96|
> http://vagrant.ptcnet.ptc.com:2280/Windchill/gwt/com.ptc.windchill.wncgwt.WncGWT/|1C2DD3E7BC435105789300F99C966F9B|com.ptc.cat.ops.client.internal.OperationDispatcher|dispatch|java.util.ArrayList/4159755760|com.ptc.windchill.enterprise.dsb.client.ops.StructureCompareOperation$StructureCompareOperationParams/619250753|com.extjs.gxt.ui.client.core.FastMap/3488076414|java.lang.String/2004016611|SOURCE_NCID|-105227984815700591|TARGET_NCID|-7516521843859502960|SOURCE_CACHEID|184184|TARGET_CACHEID|184185|SOURCE_ROOT_STRUCTURE_MODEL|com.ptc.cat.entity.client.structure.SimpleMasteredStructureModel/714351732|com.ptc.cat.entity.client.nav.internal.DefaultNavigable/1488927308|com.ptc.cat.entity.client.internal.ServerIdentifier/44651098|wt.part.WTPartMaster|156180|java.util.LinkedList/3953877921|com.ptc.cat.entity.client.ParentInfo/148369529|masterReference|wt.part.WTPart|174404|PART_USES|http://vagrant.ptcnet.ptc.com:2280/Windchill/wtcore/images/part.gif|Part|TARGET_ROOT_STRUCTURE_MODEL|SOURCE_STRUCTURE_MODEL|TARGET_STRUCTURE_MODEL|SOURCE_ATTRIBUTE_MAPPER|com.ptc.cat.entity.client.attribute.AttributeMapper/4173695238|identityBuilder|FILTERED_PART_BUILD_RULE_EPMDOCS|com.ptc.cat.entity.client.attribute.Attribute/1120602003|com.ptc.cat.entity.client.structure.AbstractStructureModel$StructureModelLocation/351430279|Child|SUBSTITUTE_PARTS|AXL_PART_DESCRIBE_DOCS|AVL_NAV_PARAMS|MFR_TO_VEN_NAV_CONSTANT|AXL_PART_REFERENCE_DOCS|REFERENCE_DOCS|CAD_DESCRIBE_DOCS|AML_NAV_PARAMS|DESCRIBE_DOCS|FILTERED_PART_BUILD_RULE_ASSOCIATION_EPMDOCS|ALTERNATE_PARTS|FILTERED_PART_BUILD_HISTORY_EPMDOCS|TARGET_ATTRIBUTE_MAPPER|SOURCE_ATTRIBUTES|TARGET_ATTRIBUTES|IS_INITIATED_FROM_LEFT|java.lang.Boolean/476441737|COMPARE_SUMMARIES_CACHE_ID|0.84591641254933151530079253572|SOURCE_CONTEXT_INFOS|TARGET_CONTEXT_INFOS|SORT_BY_SOURCE|SOURCE_SORT_INFOS|[Lcom.ptc.cat.gxt.client.data.AttributeSortInfo;/3159444690|com.ptc.cat.gxt.client.data.AttributeSortInfo/2832941857|com.extjs.gxt.ui.client.Style$SortDir/3873584144|TARGET_SORT_INFOS|SOURCE_NAV_TYPE_NAMES|java.util.HashSet/3273092938|TARGET_NAV_TYPE_NAMES|SOURCE_SOURCING_CONTEXT_ID|TARGET_SOURCING_CONTEXT_ID|SOURCE_STARTING_PATH|com.ptc.cat.entity.client.CATNodePath/4282519304|TARGET_STARTING_PATH|COMPARE_OPTIONS|{}|graphBuilder|com.ptc.windchill.enterprise.part.structureCompare.server.graph.SCGraphBuilder|applicationName|com.ptc.windchill.enterprise.part.structureCompare.StructureCompare|differenceCalculator|com.ptc.windchill.enterprise.dsb.server.graph.DSBDifferenceCalculator|java.util.HashMap/1797211028|wt.part.WTPartReferenceLink|wt.part.WTPartDescribeLink|wt.part.WTPartAlternateLink|wt.part.WTPartSubstituteLink|com.ptc.windchill.suma.axl.AXLEntry|wt.epm.build.EPMBuildRule|wt.epm.build.EPMBuildHistory|wt.epm.structure.EPMDescribeLink|com.extjs.gxt.ui.client.core.FastSet/2139705081|java.util.Arrays$ArrayList/2507071751|com.ptc.cat.ops.client.DefaultCommandMapPopulator/3331120601|com.ptc.windchill.enterprise.dsb.client.ops.StructureCompareOperation|1|2|3|4|1|5|5|1|6|7|26|8|9|8|10|8|11|8|12|8|13|8|14|8|15|8|16|8|17|18|0|19|0|0|0|20|21|0|22|23|1|24|25|25|20|26|0|27|0|0|0|19|5|1|-14|0|0|20|26|0|27|0|0|0|0|2057|0|28|0|0|5|0|1|29|30|0|0|-19|8|31|18|0|19|0|0|0|20|21|0|22|23|1|24|24|25|20|26|0|27|0|0|0|19|5|1|-25|0|0|-21|0|0|0|0|2057|0|28|0|0|5|0|1|29|30|0|0|-30|8|32|-13|8|33|-24|8|34|35|7|0|7|1|8|36|7|14|8|37|38|36|0|0|0|0|0|39|40|0|8|41|38|36|0|0|0|0|0|-43|0|8|42|38|36|0|0|0|0|0|-43|0|8|43|38|36|0|0|0|0|0|-43|0|8|44|38|36|0|0|0|0|0|-43|0|8|45|38|36|0|0|0|0|0|-43|0|8|46|38|36|0|0|0|0|0|-43|0|8|47|38|36|0|0|0|0|0|-43|0|8|48|38|36|0|0|0|0|0|-43|0|8|49|38|36|0|0|0|0|0|-43|0|8|50|38|36|0|0|0|0|0|-43|0|8|51|38|36|0|0|0|0|0|-43|0|8|52|38|36|0|0|0|0|0|-43|0|8|28|38|36|0|0|0|0|0|-43|0|8|53|35|7|0|7|1|-39|7|14|-41|38|36|0|0|0|0|0|-43|0|-44|38|36|0|0|0|0|0|-43|0|-46|38|36|0|0|0|0|0|-43|0|-48|38|36|0|0|0|0|0|-43|0|-50|38|36|0|0|0|0|0|-43|0|-52|38|36|0|0|0|0|0|-43|0|-54|38|36|0|0|0|0|0|-43|0|-56|38|36|0|0|0|0|0|-43|0|-58|38|36|0|0|0|0|0|-43|0|-60|38|36|0|0|0|0|0|-43|0|-62|38|36|0|0|0|0|0|-43|0|-64|38|36|0|0|0|0|0|-43|0|-66|38|36|0|0|0|0|0|-43|0|-68|38|36|0|0|0|0|0|-43|0|8|54|5|1|-42|8|55|5|1|-75|8|56|57|1|8|58|8|59|8|60|0|8|61|0|8|62|57|1|8|63|64|1|65|36|57|0|0|57|0|0|66|1|0|8|67|64|1|65|36|57|0|0|57|0|0|-106|0|8|68|7|2|-56|69|1|-13|-68|69|1|-13|8|70|7|2|-56|69|1|-24|-68|69|1|-24|8|71|0|8|72|0|8|73|74|1|18|0|-14|0|0|0|-19|0|0|0|2056|0|28|0|0|5|0|1|29|30|0|0|-19|8|75|74|1|18|0|-25|0|0|0|-30|0|0|0|2056|0|28|0|0|5|0|1|29|30|0|0|-30|8|76|8|77|7|3|8|78|8|79|8|80|8|81|8|82|8|83|0|0|0|5|1|-42|0|0|14|0|84|0|1|0|0|5|8|8|85|8|86|8|87|8|88|8|89|8|90|8|91|8|92|0|0|1|-1|93|2|-56|-68|81|0|0|0|0|0|0|0|0|0|94|2|-13|-24|0|0|1|0|1|0|0|0|200|14|95|0|0|0|0|5|2|-21|-21|1|0|81|10|0|0|-21|0|0|1|0|96|1|
>  
> <http://www.google.com/url?q=http%3A%2F%2Fvagrant.ptcnet.ptc.com%3A2280%2FWindchill%2Fgwt%2Fcom.ptc.windchill.wncgwt.WncGWT%2F%257C1C2DD3E7BC435105789300F99C966F9B%257Ccom.ptc.cat.ops.client.internal.OperationDispatcher%257Cdispatch%257Cjava.util.ArrayList%2F4159755760%257Ccom.ptc.windchill.enterprise.dsb.client.ops.StructureCompareOperation%24StructureCompareOperationParams%2F619250753%257Ccom.extjs.gxt.ui.client.core.FastMap%2F3488076414%257Cjava.lang.String%2F2004016611%257CSOURCE_NCID%257C-105227984815700591%257CTARGET_NCID%257C-7516521843859502960%257CSOURCE_CACHEID%257C184184%257CTARGET_CACHEID%257C184185%257CSOURCE_ROOT_STRUCTURE_MODEL%257Ccom.ptc.cat.entity.client.structure.SimpleMasteredStructureModel%2F714351732%257Ccom.ptc.cat.entity.client.nav.internal.DefaultNavigable%2F1488927308%257Ccom.ptc.cat.entity.client.internal.ServerIdentifier%2F44651098%257Cwt.part.WTPartMaster%257C156180%257Cjava.util.LinkedList%2F3953877921%257Ccom.ptc.cat.entity.client.ParentInfo%2F148369529%257CmasterReference%257Cwt.part.WTPart%257C174404%257CPART_USES%257Chttp%3A%2F%2Fvagrant.ptcnet.ptc.com%3A2280%2FWindchill%2Fwtcore%2Fimages%2Fpart.gif%257CPart%257CTARGET_ROOT_STRUCTURE_MODEL%257CSOURCE_STRUCTURE_MODEL%257CTARGET_STRUCTURE_MODEL%257CSOURCE_ATTRIBUTE_MAPPER%257Ccom.ptc.cat.entity.client.attribute.AttributeMapper%2F4173695238%257CidentityBuilder%257CFILTERED_PART_BUILD_RULE_EPMDOCS%257Ccom.ptc.cat.entity.client.attribute.Attribute%2F1120602003%257Ccom.ptc.cat.entity.client.structure.AbstractStructureModel%24StructureModelLocation%2F351430279%257CChild%257CSUBSTITUTE_PARTS%257CAXL_PART_DESCRIBE_DOCS%257CAVL_NAV_PARAMS%257CMFR_TO_VEN_NAV_CONSTANT%257CAXL_PART_REFERENCE_DOCS%257CREFERENCE_DOCS%257CCAD_DESCRIBE_DOCS%257CAML_NAV_PARAMS%257CDESCRIBE_DOCS%257CFILTERED_PART_BUILD_RULE_ASSOCIATION_EPMDOCS%257CALTERNATE_PARTS%257CFILTERED_PART_BUILD_HISTORY_EPMDOCS%257CTARGET_ATTRIBUTE_MAPPER%257CSOURCE_ATTRIBUTES%257CTARGET_ATTRIBUTES%257CIS_INITIATED_FROM_LEFT%257Cjava.lang.Boolean%2F476441737%257CCOMPARE_SUMMARIES_CACHE_ID%257C0.84591641254933151530079253572%257CSOURCE_CONTEXT_INFOS%257CTARGET_CONTEXT_INFOS%257CSORT_BY_SOURCE%257CSOURCE_SORT_INFOS%257C%255BLcom.ptc.cat.gxt.client.data.AttributeSortInfo%3B%2F3159444690%257Ccom.ptc.cat.gxt.client.data.AttributeSortInfo%2F2832941857%257Ccom.extjs.gxt.ui.client.Style%24SortDir%2F3873584144%257CTARGET_SORT_INFOS%257CSOURCE_NAV_TYPE_NAMES%257Cjava.util.HashSet%2F3273092938%257CTARGET_NAV_TYPE_NAMES%257CSOURCE_SOURCING_CONTEXT_ID%257CTARGET_SOURCING_CONTEXT_ID%257CSOURCE_STARTING_PATH%257Ccom.ptc.cat.entity.client.CATNodePath%2F4282519304%257CTARGET_STARTING_PATH%257CCOMPARE_OPTIONS%257C%257B%257D%257CgraphBuilder%257Ccom.ptc.windchill.enterprise.part.structureCompare.server.graph.SCGraphBuilder%257CapplicationName%257Ccom.ptc.windchill.enterprise.part.structureCompare.StructureCompare%257CdifferenceCalculator%257Ccom.ptc.windchill.enterprise.dsb.server.graph.DSBDifferenceCalculator%257Cjava.util.HashMap%2F1797211028%257Cwt.part.WTPartReferenceLink%257Cwt.part.WTPartDescribeLink%257Cwt.part.WTPartAlternateLink%257Cwt.part.WTPartSubstituteLink%257Ccom.ptc.windchill.suma.axl.AXLEntry%257Cwt.epm.build.EPMBuildRule%257Cwt.epm.build.EPMBuildHistory%257Cwt.epm.structure.EPMDescribeLink%257Ccom.extjs.gxt.ui.client.core.FastSet%2F2139705081%257Cjava.util.Arrays%24ArrayList%2F2507071751%257Ccom.ptc.cat.ops.client.DefaultCommandMapPopulator%2F3331120601%257Ccom.ptc.windchill.enterprise.dsb.client.ops.StructureCompareOperation%257C1%257C2%257C3%257C4%257C1%257C5%257C5%257C1%257C6%257C7%257C26%257C8%257C9%257C8%257C10%257C8%257C11%257C8%257C12%257C8%257C13%257C8%257C14%257C8%257C15%257C8%257C16%257C8%257C17%257C18%257C0%257C19%257C0%257C0%257C0%257C20%257C21%257C0%257C22%257C23%257C1%257C24%257C25%257C25%257C20%257C26%257C0%257C27%257C0%257C0%257C0%257C19%257C5%257C1%257C-14%257C0%257C0%257C20%257C26%257C0%257C27%257C0%257C0%257C0%257C0%257C2057%257C0%257C28%257C0%257C0%257C5%257C0%257C1%257C29%257C30%257C0%257C0%257C-19%257C8%257C31%257C18%257C0%257C19%257C0%257C0%257C0%257C20%257C21%257C0%257C22%257C23%257C1%257C24%257C24%257C25%257C20%257C26%257C0%257C27%257C0%257C0%257C0%257C19%257C5%257C1%257C-25%257C0%257C0%257C-21%257C0%257C0%257C0%257C0%257C2057%257C0%257C28%257C0%257C0%257C5%257C0%257C1%257C29%257C30%257C0%257C0%257C-30%257C8%257C32%257C-13%257C8%257C33%257C-24%257C8%257C34%257C35%257C7%257C0%257C7%257C1%257C8%257C36%257C7%257C14%257C8%257C37%257C38%257C36%257C0%257C0%257C0%257C0%257C0%257C39%257C40%257C0%257C8%257C41%257C38%257C36%257C0%257C0%257C0%257C0%257C0%257C-43%257C0%257C8%257C42%257C38%257C36%257C0%257C0%257C0%257C0%257C0%257C-43%257C0%257C8%257C43%257C38%257C36%257C0%257C0%257C0%257C0%257C0%257C-43%257C0%257C8%257C44%257C38%257C36%257C0%257C0%257C0%257C0%257C0%257C-43%257C0%257C8%257C45%257C38%257C36%257C0%257C0%257C0%257C0%257C0%257C-43%257C0%257C8%257C46%257C38%257C36%257C0%257C0%257C0%257C0%257C0%257C-43%257C0%257C8%257C47%257C38%257C36%257C0%257C0%257C0%257C0%257C0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>
> For other payloads it do not throw any error.
>  
>
> On Tuesday, June 26, 2018 at 11:53:30 AM UTC+5:30, Thomas Broyer wrote:
>>
>> What does com.ptc.mvc.gwt.GwtHandlerAdapter do? Could it be responsible 
>> for this behavior?
>
>

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