We're using a number of custom tags that accept JSF (deferred) EL
through dynamic attributes. In JSP 2.1 this is illegal. I therefore
tried to deactivate expression evaluation by escaping the #{ pattern,
but it seems that Tomcat 6.0.7 ignores this?
E.g.
<x:myTag id="someID" someDynamicAttribute="\#{someBean.someProp} />
Where myTag would be declared like this:
<tag>
<description>...</description>
<name>myTag</name>
<tag-class>com.someClass</tag-class>
<body-content>empty</body-content>
<attribute>
<description>...</description>
<name>id</name>
<required>false</required>
<rtexprvalue>false</rtexprvalue>
</attribute>
<dynamic-attributes>true</dynamic-attributes>
</tag>
This results in a:
org.apache.jasper.JasperException: Unable to compile class for JSP
where the deepest nested stack trace starts with:
java.lang.NullPointerException
at
org.apache.jasper.compiler.Generator$GenerateVisitor.evaluateAttribute(Generator.java:2777)
at
org.apache.jasper.compiler.Generator$GenerateVisitor.generateSetters(Generator.java:2988)
at
org.apache.jasper.compiler.Generator$GenerateVisitor.generateCustomStart(Generator.java:2169)
at
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1689)
at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1507)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2336)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2386)
at
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1705)
at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1507)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2336)
In a simple outputText escaping is ignored too.
Something like:
<h:outputText value="\#{someBean.someProp}" />
would render a literal "\" before the value of "someProp".
Escaping EL is mentioned here:
http://java.sun.com/javaee/5/docs/tutorial/doc/JSPIntro7.html
e.g.
"Escape the #{ or ${characters as follows:
|some text \#{ some more\${ text
| and
|<my:tag someAttribute="sometext\#{more\${text" />"
|
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