https://issues.apache.org/bugzilla/show_bug.cgi?id=56334
Bug ID: 56334
Summary: Double Backslash Escaping in Attributes
Product: Tomcat 7
Version: 7.0.52
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Jasper
Assignee: [email protected]
Reporter: [email protected]
Created attachment 31462
--> https://issues.apache.org/bugzilla/attachment.cgi?id=31462&action=edit
WAR file to reproduce exception
EL expressions in jspx-files are Java-String-backslash-decoded twice when
they're part of static template text. They're even decoded twice when they're
part of certain JSP-Tag attributes, but they're only decoded once during
processing when part of a JSTL tag attribute:
<!-- Works as expected yielding \?resize as value of asd -->
<c:set var="asd" value="${'\\?resize'}" />
<!-- Won't work, but should -->
<set data-value="${'\\?resize'}" />
<!-- dito -->
<jsp:element name="${'\\?resize'}"></jsp:element>
<!-- Works, but yields actually invalid results -->
<set data-value="${'\\\\?resize'}" />
During JSP compiling the following exception is thrown (taken from Tomcat log):
Apr 01, 2014 10:51:31 AM org.apache.catalina.core.StandardWrapperValve invoke
Schwerwiegend: Servlet.service() for servlet [jsp] in context with path
[/tomcat_test] threw exception [/index.jspx (line: 12, column: 37)
"${'\\?resize'}" contains invalid expression(s): javax.el.ELException: Failed
to parse the expression [${'\?resize'}]] with root cause
org.apache.jasper.JasperException: /index.jspx (line: 12, column: 37)
"${'\\?resize'}" contains invalid expression(s): javax.el.ELException: Failed
to parse the expression [${'\?resize'}]
at
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
at
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:443)
at
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:199)
at
org.apache.jasper.compiler.Validator$ValidateVisitor.getJspAttribute(Validator.java:1399)
at
org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:772)
at org.apache.jasper.compiler.Node$UninterpretedTag.accept(Node.java:1251)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2375)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2427)
at
org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:529)
at org.apache.jasper.compiler.Node$JspRoot.accept(Node.java:564)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2375)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2427)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2433)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:474)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2375)
at
org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1817)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:217)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:340) [...]
As you can see the \\ get processed to \ between the output of the line
information and the actual EL parsing.
In tomcat 7.0.27 the above examples work and produce the correct output.
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