Expression Language not working in JSPs when using Wildfly

• Type: Bug
• Status: Closed
• Resolution: No Longer Reproducible
• Affects Version/s: 7.0.1 CE GA2, Master
• Fix Version/s: 7.0.X EE, Master
• Component/s: Core Infrastructure, Core Infrastructure > Servlet JSP Compiler, Environments > App Servers
• Labels: None
• Fix Priority: 4
• Application Servers:
  Wildfly 10.0

Description

When running Liferay 7 GA2 on WildFly 10, using EL expressions in JSP pages will cause an error.

This does not affect the Tomcat Bundle.

Steps to reproduce

This issue uses a demonstration LR7 Maven project. You will need Maven to compile it, or reproduce the issue by developing a MVC Portlet by hand. All you need to do is have a JSP view containing EL expressions.

1. Install a vanilla Liferay 7 GA2 Wildfly bundle using a MySQL 5.7 database
2. Install a vanilla Liferay 7 GA2 Tomcat bundle using a MySQL 5.7 database
3. Clone the following repository : https://github.com/njuneau/lr7-test-project or create an MVC Portlet module having a JSP view and EL expressions
4. Make sure you have the public Liferay maven repository configured in your settings
5. Package the modules using the command "mvn -C clean package" in the parent project
6. Deploy the 3 modules (portlet-remover-api-0.0.1.jar, portlet-remover-svc-0.0.1.jar and portlet-remover-web-0.0.1.jar) on the Tomcat server
7. Add "category.training > Portlet Remover" to a page
8. The portlet will work correctly
9. Deploy the 3 modules (portlet-remover-api-0.0.1.jar, portlet-remover-svc-0.0.1.jar and portlet-remover-web-0.0.1.jar) on the WildFly server
10. Add "category.training > Portlet Remover" to a page

Expected result

The portlet should work

Actual result

"Portlet Remover is temporarily unavailable." will be shown on the page while the following stack trace is shown:

18:04:29,237 ERROR [default task-106][render_portlet_jsp:77] null
java.lang.ClassCastException: com.sun.el.ExpressionFactoryImpl cannot be cast to javax.el.ExpressionFactory
        at javax.el.ExpressionFactory.newInstance(ExpressionFactory.java:197)
        at javax.el.ExpressionFactory.newInstance(ExpressionFactory.java:168)
        at org.apache.jasper.compiler.JspUtil.getExpressionFactory(JspUtil.java:1192)
        at org.apache.jasper.compiler.JspUtil.validateExpressions(JspUtil.java:654)
        at org.apache.jasper.compiler.Validator$ValidateVisitor.getJspAttribute(Validator.java:1366)
        at org.apache.jasper.compiler.Validator$ValidateVisitor.checkXmlAttributes(Validator.java:1142)
        at org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:859)
        at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1502)
        at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2297)
        at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2347)
        at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2353)
        at org.apache.jasper.compiler.Node$Root.accept(Node.java:499)
        at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2297)
        at org.apache.jasper.compiler.Validator.validate(Validator.java:1890)
        at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:223)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
        at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:625)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377)

Full stack trace : el-error-stack-trace.txt

Possibly related issues

• LPS-63820 (EL is not working in JSPs)
• LPS-65488 (The module framework boot delegation permits com.sun.* which is too broad) see Kyle Stiemann' May 13th comment