webMethods Knowlegebase : Unwanted error message on "Delete Document" adapter service (1806689)

Problem

After calling a "Delete Document" adapter service (Adapter version 3.0.5_fix), the following unwanted log error occurs in IS server.log:

[ADA.7072.9999E] ... Cannot decode message .

Here is the full server.log with trace level:

[ISP.0090.0004I] SharePoint:onEvent -- URL:[http://******/websites/test3/documents], id:[16] user:[i:0#.w|*****\thr]

[ADA.7072.9999D] Execute ReadDocumentService[WmSharePointConnection[http://*****/websites/test3, thr]] with AdapterServiceBase_Generic

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/lists , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/lists

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/ContentTypes , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/ContentTypes

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/?$select=*,RootFolder , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/?$select=*,RootFolder

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/Fields , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/Fields

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/items(16)?$select=*,FileRef , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/items(16)?$select=*,FileRef

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/ContentTypes('0x010100659E3C7417A9E645A2B9F88B36D927B1')/Fields , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/ContentTypes('0x010100659E3C7417A9E645A2B9F88B36D927B1')/Fields

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/GetFileByServerRelativeUrl('%2fwebsites%2ftest3%2fdocuments%2fcustom_wrapper.conf')/$value , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/GetFileByServerRelativeUrl('%2fwebsites%2ftest3%2fdocuments%2fcustom_wrapper.conf')/$value

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/items(16)/FieldValuesAsText , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/items(16)/FieldValuesAsText

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/RegionalSettings , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/RegionalSettings

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/RegionalSettings , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/RegionalSettings

[ISP.0090.0004I] SharePoint:onEvent -- Result:[CLEAN] contains office macros:[false] error:[%result/error%]

[ISP.0090.0004I] SharePoint:onEvent -- delete id:[16] ...

[ADA.7072.9999D] Execute DeleteDocumentService[WmSharePointConnection[http://*****/websites/test3, thr]] with AdapterServiceBase_Generic

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/lists , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/lists

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/ContentTypes , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/ContentTypes

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/?$select=*,RootFolder , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/?$select=*,RootFolder

[ADA.7072.9999D] SharePoint REST request: [ Method: GET , URL: _api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/items(16)?$select=*,FileRef , RequestBody: null , Operation: null , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/lists('e3857f38-6b90-4822-968d-bdb2b02ea2c5')/items(16)?$select=*,FileRef

[ADA.7072.9999D] SharePoint REST request: [ Method: POST , URL: _api/web/GetFileByServerRelativeUrl('%2fwebsites%2ftest3%2fdocuments%2fcustom_wrapper.conf') , RequestBody: null , Operation: DELETE , Condition: null , SiteUrl: http://*****/websites/test3/_api/web/GetFileByServerRelativeUrl('%2fwebsites%2ftest3%2fdocuments%2fcustom_wrapper.conf')

[ADA.7072.9999D] ... Cannot decode messagejava.lang.ClassCastException: javax.json.JsonValue$1 cannot be cast to javax.json.JsonObject

at org.glassfish.json.JsonObjectBuilderImpl$JsonObjectImpl.getJsonObject(JsonObjectBuilderImpl.java:172)

at com.braintribe.integration.notification.util.DmsNotificationEventDecoder.decode(DmsNotificationEventDecoder.java:35)

at com.braintribe.integration.notification.client.WebSocketClientEndpoint.decode(WebSocketClientEndpoint.java:59)

at com.braintribe.integration.notification.client.WebSocketClientEndpoint.onMessage(WebSocketClientEndpoint.java:36)

at org.java_websocket.client.WebSocketClient.onWebsocketMessage(WebSocketClient.java:591)

at org.java_websocket.drafts.Draft_6455.processFrameText(Draft_6455.java:885)

at org.java_websocket.drafts.Draft_6455.processFrame(Draft_6455.java:819)

at org.java_websocket.WebSocketImpl.decodeFrames(WebSocketImpl.java:379)

at org.java_websocket.WebSocketImpl.decode(WebSocketImpl.java:216)

at org.java_websocket.client.WebSocketClient.run(WebSocketClient.java:508)

at java.lang.Thread.run(Thread.java:748)

[ADA.7072.9999E] ... Cannot decode message

[ADA.7072.9999T] send frame: Framedata{ optcode:PING, fin:true, rsv1:false, rsv2:false, rsv3:false, payloadlength:[pos:0, len:0], payload:}

[ADA.7072.9999T] afterEnconding(0):

[ADA.7072.9999T] write(6): ‰€Ý^­[

[ADA.7072.9999T] process(2): (Š )

[ADA.7072.9999T] afterDecoding(0):

[ADA.7072.9999T] matched frame: Framedata{ optcode:PONG, fin:true, rsv1:false, rsv2:false, rsv3:false, payloadlength:[pos:0, len:0], payload:}

[ADA.7072.9999T] process(2): (‰ )

[ADA.7072.9999T] afterDecoding(0):

[ADA.7072.9999T] matched frame: Framedata{ optcode:PING, fin:true, rsv1:false, rsv2:false, rsv3:false, payloadlength:[pos:0, len:0], payload:}

[ADA.7072.9999T] send frame: Framedata{ optcode:PONG, fin:true, rsv1:false, rsv2:false, rsv3:false, payloadlength:[pos:0, len:0], payload:}

[ADA.7072.9999T] afterEnconding(0):

[ADA.7072.9999T] write(6): Š€#v…Œ