Front Man - can't forward or redirect to Command

[Mark Frasertoo]

I have a ListVarieties command to list a table's entries. From that view, I can initiate a NewVarieties command. After inserting the new record I have tried to forwardToCommand("ListVarieties") and redirectToCommand("ListVarieties") to return to the list of records but I keep getting:

java.lang.IllegalStateException: Cannot forward after response has been committed

Do I not understand what these methods are for?

Here's my code:

public class ListVarietiesCommand implements Command {

	static Logger logger = Logger.getLogger(ListVarietiesCommand.class);

	public void execute(CommandContext ctx) throws ServletException, IOException {

		try {
			VarietyService vSvc = new VarietyService();
			List<Variety> varietyList = vSvc.toList(vSvc.findAll());
			ctx.setScopedVariable("varietyList", varietyList);
			ctx.forwardToView("VarietiesList");

		} catch (VarietyDaoException e) {
			e.printStackTrace();
			logger.error("VarietyDaoException: " + e.getMessage());
			ctx.setScopedVariable("errorMessage", "Error loading Variety list");
			ctx.forwardToView("ErrorPage");
		}
	}

}


public class NewVarietyCommand implements Command {

	public void execute(CommandContext ctx) throws ServletException, IOException {
		ActionManager.initAction(ctx);
		ctx.forwardToView("NewVarietyForm");
	}

}


public class InsertVarietyCommand implements Command {

	static Logger logger = Logger.getLogger(InsertVarietyCommand.class);

	public void execute(CommandContext ctx) throws ServletException, IOException {

		if(ActionManager.isNewAction(ctx)) {

			VarietyFormValidator varietyForm = new VarietyFormValidator(ctx.getRequest());

			if( !varietyForm.isValid() ) {
				ctx.setScopedVariable("varietyForm", varietyForm);
				ctx.forwardToView("NewVarietyForm");
			}

			try {
				VarietyService vSvc = new VarietyService();
				vSvc.insert( varietyForm );
				ctx.redirectToCommand("ListVarieties");

			} catch (VarietyDaoException e) {
				e.printStackTrace();
				logger.error("VarietyDaoException: " + e.getMessage());
				ctx.setScopedVariable("errorMessage", "Error creating Variety record");
				ctx.forwardToView("ErrorPage");
			}
		}

		ctx.setScopedVariable("errorMessage", "Duplicate form action");
		ctx.forwardToView("ErrorPage");
	}

}

Thanks for any help you can offer.

[Mark Frasertoo]

Here's my stack trace:

INFO http-80-1 org.bibeault.frontman.CommandBroker - executing command ListVarieties (com.allianceseed.db.commands.ListVarietiesCommand)
INFO http-80-1 org.bibeault.frontman.CommandBroker - executing command NewVariety (com.allianceseed.db.commands.NewVarietyCommand)
INFO http-80-1 org.bibeault.frontman.CommandBroker - executing command InsertVariety (com.allianceseed.db.commands.InsertVarietyCommand)
ERROR http-80-1 org.apache.catalina.core.ContainerBase.[Catalina].[ascdev].[/].[DBAdmin] - Servlet.service() for servlet DBAdmin threw exception
java.lang.IllegalStateException: Cannot forward after response has been committed
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:313)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
at org.bibeault.frontman.CommandContextImplementation.forward(CommandContextImplementation.java:219)
at org.bibeault.frontman.CommandContextImplementation.forwardToView(CommandContextImplementation.java:299)
at com.allianceseed.db.commands.InsertVarietyCommand.execute(InsertVarietyCommand.java:45)
at org.bibeault.frontman.CommandBroker.doPost(CommandBroker.java:228)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at com.patersonglobalfoods.filter.MaintenanceModeFilter.doFilter(MaintenanceModeFilter.java:63)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:834)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:640)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1286)
at java.lang.Thread.run(Unknown Source)

[Bear Bibeault]

Can you please post the command classes individually so that the line numbers match those in the stack trace?

[Mark Frasertoo]

Just got laid off from work so I can't do the post. No kidding! Wish I was. I'm working on another app at home so I'll see if I have the problem there. I'm liking FrontMan so far. I can definitely see how to personalize it too. Nice system, Thanks!

[Bear Bibeault]

Eesh! Sorry about the job situation!