[jbosstools-issues] [JBoss JIRA] Created: (JBIDE-1280) JBoss Tools JSP Editor does not process some problems in vpe templates in a user friendly way

[Viacheslav Kabanovich (JIRA)]

JBoss Tools JSP Editor does not process some problems in vpe templates in a user friendly way
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                 Key: JBIDE-1280
                 URL: http://jira.jboss.com/jira/browse/JBIDE-1280
             Project: JBoss Tools
          Issue Type: Bug
          Components: Visual Page Editor
    Affects Versions: 2.0.0.Beta4
            Reporter: Viacheslav Kabanovich


1. provide an incorrect vpe expression in some vpe template.
(I used <span title="{tagstring()|tagstring()}" /> instead of <span title="{tagstring()}" /> 
for standard jsf tag templates in vpe-templates-jsf.xml).
2. prepare jsp file that uses the corrupted template.
3. open jsp file with JBoss Tools JSP Editor.
Result: blank visual editor and empty Eclipse log. 
4. Select Preview tab
Result: tab is empty and log contains Error

org.jboss.tools.vpe.editor.template.expression.VpeExpressionError: Error of type conversion
	at org.jboss.tools.vpe.editor.template.expression.VpeValue.or(VpeValue.java:94)
	at org.jboss.tools.vpe.editor.template.expression.VpeOrOperation.exec(VpeOrOperation.java:26)
	at org.jboss.tools.vpe.editor.template.VpeAttributeCreator.create(VpeAttributeCreator.java:54)

The Error is caught by Workbench.

The question is: why most problems in vpe expressions throw VpeExpressionBuilderException 
and some problems throw VpeExpressionError (which extends java.lang.Error)?

Comment to java.lang.Error says that 
"An Error is a subclass of Throwable that indicates serious problems 
that a reasonable application should not try to catch"

As shown above, in cases when Studio does not catch VpeExpressionError, user has no idea what is wrong, 
and in cases when Eclipse catches it, it would be more proper to use something like 
VpeExpressionExecException extending Exception rather than Error.


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