Hi,
In tomcat 7.0.54, the variable is not supported.
I changed the source
apache-tomcat-7.0.54/webapps/examples/jsp/tagplugin/foreach.jsp
<c:set var="num" value="20" />
<c:forEach var="item" begin="1" end="{$num}">
${item}
</c:forEach>
Then it reports:
org.apache.jasper.JasperException: Unable to compile class for JSP
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:672)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.NumberFormatException: For input string: "{$num}"
java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
java.lang.Integer.parseInt(Integer.java:492)
java.lang.Integer.valueOf(Integer.java:582)
org.apache.jasper.compiler.JspUtil.coerceToInt(JspUtil.java:605)
org.apache.jasper.compiler.Generator$GenerateVisitor.convertString(Generator.java:3184)
org.apache.jasper.compiler.Generator$GenerateVisitor.evaluateAttribute(Generator.java:3001)
org.apache.jasper.compiler.Generator$GenerateVisitor.generateSetters(Generator.java:3106)
org.apache.jasper.compiler.Generator$GenerateVisitor.generateCustomStart(Generator.java:2276)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1768)
org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1538)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2377)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2429)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2435)
org.apache.jasper.compiler.Node$Root.accept(Node.java:474)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2377)
org.apache.jasper.compiler.Generator.generate(Generator.java:3517)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:250)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:657)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
I did same tests on Tomcat 7.0.37 and this error did not happen.
Jeff
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