GWT RPC file name in ClassNotFoundException

[DK]

I am getting the following error while upgrading from GWT 2.6.1 to GWT
2.8.2:

com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException:*
java.lang.ClassNotFoundException: 1C2DD3E7BC435105789300F99C966F9B*
at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:323)
at com.ptc.mvc.gwt.GwtHandlerAdapter.processCall(GwtHandlerAdapter.java:156)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:305)
at
com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at com.ptc.mvc.gwt.GwtHandlerAdapter.handle(GwtHandlerAdapter.java:118)
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
at
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at wt.licenseusage.licensing.LicenseFilter.doFilter(LicenseFilter.java:47)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at
com.ptc.core.ui.validation.URLValidationFilter.doFilter(URLValidationFilter.java:77)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at
wt.httpgw.filter.WTContextBeanFilter.doWithWtContextBeanHandler(WTContextBeanFilter.java:104)
at
wt.httpgw.filter.WTContextBeanFilter.doFilter(WTContextBeanFilter.java:58)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at wt.servlet.CompressionFilter.doFilter(CompressionFilter.java:301)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at wt.servlet.RequestInterrupter.doFilter(RequestInterrupter.java:335)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at
wt.servlet.ServletRequestMonitor.doFilter(ServletRequestMonitor.java:1660)
at
wt.servlet.ServletRequestMonitorFilter.doFilter(ServletRequestMonitorFilter.java:56)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:479)
at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1478)
at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
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)
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.RPC.decodeRequest(RPC.java:312)
... 49 more
Caused by: java.lang.ClassNotFoundException:
1C2DD3E7BC435105789300F99C966F9B
at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1308)
at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1136)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserialize(ServerSerializationStreamReader.java:634)
... 76 more

There exist a gwt.rpc file with name*: 1C2DD3E7BC435105789300F99C966F9B*

*It is not clear which class the error talks about and what does the rpc
file name after ClassnotFoundException mean?*

*PFA the gwt.rpc file.*

[Thomas Broyer]

What does com.ptc.mvc.gwt.GwtHandlerAdapter do? Could it be responsible for this behavior?

[DK]

*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|Loading Image...|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|

For other payloads it do not throw any error.

Post by Thomas Broyer
What does com.ptc.mvc.gwt.GwtHandlerAdapter do? Could it be responsible for this behavior?

[Colin Alworth]

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.

Post by DK
*GwtHandlerAdapter* class extends the *RemoteServiceServlet* class and
overrides its *processCall(String payload)* method.
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|
<Loading 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For other payloads it do not throw any error.

Post by Thomas Broyer
What does com.ptc.mvc.gwt.GwtHandlerAdapter do? Could it be responsible
for this behavior?