todo example: Starting a simple task failed
Hello!
I've tried to rebuild the todo example .
It is working fine so far except the done
button. There is problem with the posting of the taskInstance
attribute to start and stop a task.
Here is my todox.html:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
template="layout/template.xhtml">
<head>
<title>Todo List</title>
</head>
<body>
<h1>Todo List</h1>
<f:view>
<h:form id="list">
<div>
<h:outputText value="There are no todo items."
rendered="#{empty taskInstanceList}"/>
<h:outputText value="#{task}"/>
<h:dataTable value="#{taskInstanceList}" var="task"
rendered="#{not empty taskInstanceList}">
<h:column>
<f:facet name="header">
<h:outputText value="Description"/>
</f:facet>
<h:inputText value="#{task.description}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Task Instance ID"/>
</f:facet>
<h:inputText value="#{task.id}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Created"/>
</f:facet>
<h:outputText value="#{task.taskMgmtInstance.processInstance.start}">
<f:convertDateTime type="date"/>
</h:outputText>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Priority"/>
</f:facet>
<h:inputText value="#{task.priority}" style="width: 30"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Due Date"/>
</f:facet>
<h:inputText value="#{task.dueDate}" style="width: 100">
<f:convertDateTime type="date" dateStyle="short"/>
</h:inputText>
</h:column>
<h:column>
<h:commandButton value="Done" action="#{todoList.done}" taskInstance="#{task.id}"/>
</h:column>
</h:dataTable>
</div>
<div>
<h:messages/>
</div>
<div>
<h:commandButton value="Update Items" action="update"/>
</div>
</h:form>
<h:form id="new">
<div>
<h:inputText value="#{todoList.description}"/>
<h:commandButton value="Create New Item" action="#{todoList.createTodo}"/>
</div>
</h:form>
</f:view>
</body>
</html>Especially this part causes problems:
<h:commandButton value="Done" action="#{todoList.done}" taskInstance="#{task.id}"/> And this is my TodoList.java class:
@Name("todoList")
public class TodoList {
private String description;
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
@CreateProcess(definition = "todo")
public void createTodo() {
}
@StartTask @EndTask
public void done() {
}
}I get this error:
Caused by javax.servlet.ServletException with message: "#{todoList.done}: java.lang.IllegalStateException: task/process id may not be nullI don't understand this because I know that the taskInstance id is not null. I made some simple printouts to see the task ids.
Please give me a hint.
Thx.
