https://issues.apache.org/bugzilla/show_bug.cgi?id=44994
Summary: JSP EL condition expression fails when nested: ${a ? b ?
x: y: z}
Product: Tomcat 6
Version: 6.0.16
Platform: Sun
OS/Version: Solaris
Status: NEW
Severity: normal
Priority: P2
Component: Jasper
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
A JSP Expression Language (EL) conditional expression cannot have another
conditional expression as its "true" expression.
The following fails:
${0 lt a ? 1 lt a ? "many": "one": "none"}
It throws the following exception (the 19th character is the second question
mark):
org.apache.el.parser.ParseException: Encountered "?" at line 1, column 19.
Was expecting one of:
"." ...
"[" ...
...
org.apache.el.parser.ELParser.generateParseException(ELParser.java:1890)
org.apache.el.parser.ELParser.jj_consume_token(ELParser.java:1770)
org.apache.el.parser.ELParser.Choice(ELParser.java:220)
The expression succeeds if brackets are added around the inner conditional
expression:
${0 lt a ? (1 lt a ? "many": "one"): "none"}
I assume the bug is in ELParser.jjt (in
apache-tomcat-6.0.16-src/java/org/apache/el/parser/). It uses Or(), instead of
Choice(), for the "true" expression.
WRONG: Or() (<QUESTIONMARK> Or() <COLON> Choice() #Choice(3))*
RIGHT: Or() (<QUESTIONMARK> Choice() <COLON> Choice() #Choice(3))*
Diff:
107c107
< Or() (<QUESTIONMARK> Or() <COLON> Choice() #Choice(3))*
---
> Or() (<QUESTIONMARK> Choice() <COLON> Choice() #Choice(3))*
This bug was not present in Tomcat 5.5.
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