What could cause this exception:
Caused by: java.lang.IllegalArgumentException: value of context variable is not
an instance of the component bound to the context variable: price
| at org.jboss.seam.Component.getInstance(Component.java:1639)
| at org.jboss.seam.Component.getInstance(Component.java:1594)
| at
org.jboss.seam.jsf.SeamVariableResolver.resolveVariable(SeamVariableResolver.java:46)
| at
org.apache.myfaces.custom.redirectTracker.RedirectTrackerVariableResolver.resolveVariable(RedirectTrackerVariableResolver.java:41)
| at
org.apache.myfaces.custom.security.SecurityContextVariableResolver.resolveVariable(SecurityContextVariableResolver.java:45)
| at
org.apache.myfaces.config.LastVariableResolverInChain.resolveVariable(LastVariableResolverInChain.java:42)
| at
org.apache.myfaces.el.ValueBindingImpl$ELVariableResolver.resolveVariable(ValueBindingImpl.java:574)
| at org.apache.commons.el.NamedValue.evaluate(NamedValue.java:124)
| at
org.apache.commons.el.ComplexValue.evaluate(ComplexValue.java:140)
| at
org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:383)
| ... 40 more
|
This is totally baffling to me. I have a form which displays fine, and then
when I try to change the price.foo setting and hit "submit", I get a
"EvaluationException: Cannot get value for expression '#{price.foo}'" which is
caused by the exception above.
One possibility is that I should write a data transfer object and put that in
my stateful session bean, and when the user clicks "submit", the session bean
will copy the info from the data transfer object into the persistent entity.
But I thought the entire purpose of Seam was to get rid of such ugly coding
styles. Any ideas?
This is with Jboss 4.05 JEMS beta 3, Seam 1.1rc2, and all in Java 6.
Any ideas would be appreciated. If I'm going to have to write a bunch of data
transfers objects, I might as well not use Seam, right? But I don't see posts
of other people doing that so I'm confused.
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