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Invalid Javascript Exception

jakoby84

*** SOLVED (see posting below) *** 
 
Hello, 
I'm following 'Birt - A Field Guide'. In tutorial 2 I am asked to group data and to write a javascript snippet in a header row column binding expression. This is to generate values for rangeStart/rangeEnd for the group header (interval group). 
 
When I hit preview I get the exception (full stack trace below): 
 
<pre class='_prettyXprint _lang-auto _linenums:0'>The following items have errors:
Table (id = 9):
+ A BIRT exception occurred. See next exception for more information.
Invalid javascript expression: for(i=50000;i < 300000;i+=50000){if (row["CREDITLIMIT"] < i){rangeStart = i - 1;rangeEnd = i - 50000;break;}}
(Element ID:9)</pre>
 
I assured that the data source is set up correctly (Edit Data Set -> Preview Results shows actual results) and I am pretty sure that the javascript code IS correct. 
 
On the internet I found some posts concerning this exception which suggest that it is due to two conflicting javascript jar packages (i.e. the one Birt delivers and a second one, in most cases called yuicompressor*.jar). But I don't use yuicompressor as far as I know. 
 
Please could you help me to solve the error? Any help is much appreciated! Let me know if you need more infos to resolve the issue. 
 
System Details: 
<ul class='bbc'><li>Windows 7 Enterprise SP1 64bit</li><li>java -version --> Java SE Runtime Environment (build 1.7.0_09-b05 / Java HotSpot 64-Bit Server VM (build 23.5-b02, mixed mode)</li><li>javac -version --> javac 1.7.0_09</li><li>Eclipse Java EE IDE for Web Developers, Version: Juno Release, Build id: 20120614-1722</li><li>BIRT Framework, 4.2.1.v20120820-ChBG8UGYgRQlJ7y9Lz-wS7nDcRL4</li><li>Birt Chart Framework and all other extensions available from <a class='bbc_url' href='http://download.eclipse.org/birt/update-site/4.2'>http://download.eclipse.org/birt/update-site/4.2</a></li></ul>
 
StackTrace: 
<pre class='_prettyXprint _lang-auto _linenums:0'>The following items have errors:

Table (id = 9):
- A BIRT exception occurred. See next exception for more information.
Invalid javascript expression: for(i=50000;i < 300000;i+=50000){if (row["CREDITLIMIT"] < i){rangeStart = i - 1;rangeEnd = i - 50000;break;}} (Element ID:9)
data.engine.BirtException ( 1 time(s) )
detail : org.eclipse.birt.report.engine.api.EngineException: A BIRT exception occurred. See next exception for more information.
Invalid javascript expression: for(i=50000;i < 300000;i+=50000){if (row["CREDITLIMIT"] < i){rangeStart = i - 1;rangeEnd = i - 50000;break;}} (Element ID:9)
at org.eclipse.birt.report.engine.executor.ExecutionContext.addException(ExecutionContext.java:1237)
at org.eclipse.birt.report.engine.executor.ExecutionContext.addException(ExecutionContext.java:1216)
at org.eclipse.birt.report.engine.executor.QueryItemExecutor.executeQuery(QueryItemExecutor.java:96)
at org.eclipse.birt.report.engine.executor.TableItemExecutor.execute(TableItemExecutor.java:62)
at org.eclipse.birt.report.engine.internal.executor.dup.SuppressDuplicateItemExecutor.execute(SuppressDuplicateItemExecutor.java:43)
at org.eclipse.birt.report.engine.internal.executor.wrap.WrappedReportItemExecutor.execute(WrappedReportItemExecutor.java:46)
at org.eclipse.birt.report.engine.internal.executor.l18n.LocalizedReportItemExecutor.execute(LocalizedReportItemExecutor.java:34)
at org.eclipse.birt.report.engine.layout.html.HTMLBlockStackingLM.layoutNodes(HTMLBlockStackingLM.java:65)
at org.eclipse.birt.report.engine.layout.html.HTMLPageLM.layout(HTMLPageLM.java:92)
at org.eclipse.birt.report.engine.layout.html.HTMLReportLayoutEngine.layout(HTMLReportLayoutEngine.java:100)
at org.eclipse.birt.report.engine.api.impl.RunAndRenderTask.doRun(RunAndRenderTask.java:180)
at org.eclipse.birt.report.engine.api.impl.RunAndRenderTask.run(RunAndRenderTask.java:77)
at org.eclipse.birt.report.service.ReportEngineService.runAndRenderReport(ReportEngineService.java:937)
at org.eclipse.birt.report.service.BirtViewerReportService.runAndRenderReport(BirtViewerReportService.java:973)
at org.eclipse.birt.report.service.actionhandler.BirtGetPageAllActionHandler.__execute(BirtGetPageAllActionHandler.java:131)
at org.eclipse.birt.report.service.actionhandler.AbstractBaseActionHandler.execute(AbstractBaseActionHandler.java:90)
at org.eclipse.birt.report.soapengine.processor.AbstractBaseDocumentProcessor.__executeAction(AbstractBaseDocumentProcessor.java:47)
at org.eclipse.birt.report.soapengine.processor.AbstractBaseComponentProcessor.executeAction(AbstractBaseComponentProcessor.java:143)
at org.eclipse.birt.report.soapengine.processor.BirtDocumentProcessor.handleGetPageAll(BirtDocumentProcessor.java:183)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.birt.report.soapengine.processor.AbstractBaseComponentProcessor.process(AbstractBaseComponentProcessor.java:112)
at org.eclipse.birt.report.soapengine.endpoint.BirtSoapBindingImpl.getUpdatedObjects(BirtSoapBindingImpl.java:66)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.axis.providers.java.RPCProvider.invokeMethod(RPCProvider.java:397)
at org.apache.axis.providers.java.RPCProvider.processMessage(RPCProvider.java:186)
at org.apache.axis.providers.java.JavaProvider.invoke(JavaProvider.java:323)
at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)
at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)
at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)
at org.apache.axis.handlers.soap.SOAPService.invoke(SOAPService.java:454)
at org.apache.axis.server.AxisServer.invoke(AxisServer.java:281)
at org.apache.axis.transport.http.AxisServlet.doPost(AxisServlet.java:699)
at org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.doPost(BirtSoapMessageDispatcherServlet.java:265)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.service(BirtSoapMessageDispatcherServlet.java:122)
at org.eclipse.equinox.http.registry.internal.ServletManager$ServletWrapper.service(ServletManager.java:180)
at org.eclipse.equinox.http.servlet.internal.ServletRegistration.service(ServletRegistration.java:61)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:128)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:60)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.equinox.http.jetty.internal.HttpServerManager$InternalHttpServiceServlet.service(HttpServerManager.java:384)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:598)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:486)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111)
at org.eclipse.jetty.server.Server.handle(Server.java:350)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454)
at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:900)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:954)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:851)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:77)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:606)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:46)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:603)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:538)
at java.lang.Thread.run(Unknown Source)
Caused by: org.eclipse.birt.data.engine.core.DataException: A BIRT exception occurred. See next exception for more information.
Invalid javascript expression: for(i=50000;i < 300000;i+=50000){if (row["CREDITLIMIT"] < i){rangeStart = i - 1;rangeEnd = i - 50000;break;}}
at org.eclipse.birt.data.engine.core.DataException.wrap(DataException.java:123)
at org.eclipse.birt.data.engine.expression.ExpressionCompilerUtil.populateColumnList(ExpressionCompilerUtil.java:504)
at org.eclipse.birt.data.engine.expression.ExpressionCompilerUtil.extractDataSetColumnExpression(ExpressionCompilerUtil.java:276)
at org.eclipse.birt.data.engine.expression.ExpressionCompilerUtil.extractDataSetColumnExpression(ExpressionCompilerUtil.java:193)
at org.eclipse.birt.data.engine.impl.ResultIterator.validateManualBindingExpressions(ResultIterator.java:370)
at org.eclipse.birt.data.engine.impl.ResultIterator.<init>(ResultIterator.java:148)
at org.eclipse.birt.data.engine.impl.QueryResults.getResultIterator(QueryResults.java:212)
at org.eclipse.birt.report.engine.data.dte.QueryResultSet.<init>(QueryResultSet.java:98)
at org.eclipse.birt.report.engine.data.dte.DteDataEngine.doExecuteQuery(DteDataEngine.java:168)
at org.eclipse.birt.report.engine.data.dte.AbstractDataEngine.execute(AbstractDataEngine.java:267)
at org.eclipse.birt.report.engine.executor.ExecutionContext.executeQuery(ExecutionContext.java:1939)
at org.eclipse.birt.report.engine.executor.QueryItemExecutor.executeQuery(QueryItemExecutor.java:80)
... 67 more
Caused by: org.eclipse.birt.core.exception.CoreException: Invalid javascript expression: for(i=50000;i < 300000;i+=50000){if (row["CREDITLIMIT"] < i){rangeStart = i - 1;rangeEnd = i - 50000;break;}}
at org.eclipse.birt.core.data.ExpressionParserUtility.compileColumnExpression(ExpressionParserUtility.java:85)
at org.eclipse.birt.core.data.ExpressionUtil.extractColumnExpressions(ExpressionUtil.java:282)
at org.eclipse.birt.data.engine.expression.ExpressionCompilerUtil.populateColumnList(ExpressionCompilerUtil.java:499)
... 77 more
Caused by: org.eclipse.birt.core.exception.CoreException: org.eclipse.birt.core
at org.eclipse.birt.core.data.ExpressionParserUtility.CompiledExprFromTree(ExpressionParserUtility.java:160)
at org.eclipse.birt.core.data.ExpressionParserUtility.compileColumnExpression(ExpressionParserUtility.java:78)
... 79 more
</pre>

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Comments

jakoby84

*** SOLVED *** 
I'm sorry having bothered you. I forgot to C/P one line of code, namingly 
 
<pre class='_prettyXprint _lang-auto _linenums:0'>displayString = rangeStart + " - " + rangeEnd;</pre>
 
It is kind of counter-intuitive to me to use JavaScript in that context. Thus I was not able to identify the error in the first place. Now everything works as expected

Nevertheless it would have been much more helpful to get a pointer from the framework where exactly my error was (I guess it could have been detected that displayString was not set). Anyways, being glad to have it resolved. 
 
By the way: I start to really like the reporting framework -- although I'm still quite at the beginning -- and probably will use it in a Servlet app. Thanks for your work; maybe I can contribute some day when digging deeper into the stuff.