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Cannot find cause of "java.lang.ClassCastException: java.lang.String cannot be cast

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Hello there,

I am working with version SmartClient Version: v10.0p_2015-01-23/PowerEdition Deployment (built 2015-01-23) on Firefox browser.

I am trying to open a frame which has a listgrid with some cols. one of the column is a ValueMap. i.e. it contains a ComboBox widget. For some reason when i try to open this frame i get this error. CAn somebody please help me to the correct path.

Code:

=== 2015-03-10 08:57:15,468 [3-26] DEBUG SQLConnectionManager - About to close  with hashcode "11519858"
=== 2015-03-10 08:57:15,468 [3-26] DEBUG PoolableDataSourceFactory - Cleared and passivated DataSource 11 of type 'productDS'
=== 2015-03-10 08:57:15,468 [3-26] ERROR IDACall - com.isomorphic.servlet.IDACall top-level exception
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean
        at com.isomorphic.datasource.DataSource.dropExtraFields(DataSource.java:1156)
        at com.isomorphic.rpc.RPCManager.filterDSResponseData(RPCManager.java:816)
        at com.isomorphic.rpc.RPCManager.completeResponse(RPCManager.java:1325)
        at com.isomorphic.rpc.RPCManager.send(RPCManager.java:648)
        at com.isomorphic.servlet.IDACall.processRPCTransaction(IDACall.java:178)
        at com.isomorphic.servlet.IDACall.processRequest(IDACall.java:142)
        at com.isomorphic.servlet.IDACall.doPost(IDACall.java:76)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
        at com.isomorphic.servlet.BaseServlet.service(BaseServlet.java:156)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494)
        at com.isomorphic.servlet.CompressionFilter._doFilter(CompressionFilter.java:260)
        at com.isomorphic.servlet.BaseFilter.doFilter(BaseFilter.java:83)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
        at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:68)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
        at org.eclipse.jetty.server.Server.handle(Server.java:370)
        at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
        at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960)
        at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021)
        at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
        at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
        at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
        at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
        at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
        at java.lang.Thread.run(Thread.java:745)
=== 2015-03-10 08:57:15,468 [3-26] DEBUG ConfigParser - Matched var name: debug
=== 2015-03-10 08:57:15,468 [3-26] DEBUG ConfigParser - value after substitution: true

and my datasource looks like so

Code:


<DataSource ID="productDS" serverType="sql" tableName="product">
        <fields>
                <field name="productID" type="int" hidden="true" primaryKey="true" />
                <field name="productCode" type="int" title="Code" />
                <field name="productName" type="String" title="Product Name" />
                <field name="category" type="text" length="15" title="Category">
                        <valueMap>
                                <value>XXXX</value>
                                <value>YYYYY</value>
                                <value>NA</value>
                        </valueMap>
                </field>
                <field name="price" type="float" title="Price" />
        </fields>
        <dropExtraFields></dropExtraFields>
</DataSource>


and i create my listgrid like so,

Code:

private void initialise()
        {
                DataSource ds = DataSource.get("productDS");

                productList = new ListGrid();
                productList.setShowRowNumbers(true);
                productList.setHeight(425);
                productList.setDataSource(ds);
                productList.setEditEvent(ListGridEditEvent.DOUBLECLICK);
                productList.setAutoSaveEdits(false);
                productList.setSaveByCell(false);               
                productList.setAutoFetchData(true); 
                productList.setCanEdit(true); 
                productList.setModalEditing(true); 
                productList.setListEndEditAction(RowEndEditAction.NEXT);


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