Failed to compile JSP containing Java 7 syntax

[jessholle]

Wildfly 8.0.0 is failing to compile a JSP containing Java 7 syntax (in scriptlets, yes, I know one shouldn't have such...).

So I poked around and eventually edit to standalone-full.xml

	<servlet-container name="default" allow-non-standard-wrappers="true" default-buffer-cache="default" stack-trace-on-error="local-only">
	<jsp-config source-vm="1.7" target-vm="1.7"/>
	</servlet-container>

adding the the bolded bits.

This shows up in the MBeans, so clearly this is being read.

Yet this seems to have no effect on the JSP compilation whatsoever.  Via JMX, I changed displaySourceFragment to false -- and this also seemed to have no effect.

What am I missing here???

[jaikiran]

Please post the entire exception stacktrace as well as the relevant part from your JSP where you are using the Java 7 syntax.

By the way, have you tried this against 8.1.0.Final? Does it work there?

[jessholle]

I don't believe the exception itself is relevant.  My issue is that JBoss is clearly not accepting Java 7 syntax in my JSP and my attempts to configure the JSP engine, while clearly evident in JMX MBeans, are failing to influence the JSP compiler's actual behavior.

That said, with a test JSP that simply uses Java 7's diamond operator:

<%

java.util.List<String>  list = new java.util.ArrayList<>();

list.add( "hello world" );

out.println( list );

%>

I get the following error:

2014-07-25 11:25:47,047 ERROR [io.undertow.request] (default task-5) UT005023: Exception handling request to /ServiceCenter/wtcore/java7test.jsp: org.apache.jasper.JasperException: JBWEB004062: Unable to compile class for JSP:

JBWEB004060: An error occurred at line: 2 in the jsp file: /wtcore/java7test.jsp

Type mismatch: cannot convert from ArrayList<?> to List<String>

1: <%

2: java.util.List<String>  list = new java.util.ArrayList<>();

3: list.add( "hello world" );

4: out.println( list );

5: %>

JBWEB004060: An error occurred at line: 2 in the jsp file: /wtcore/java7test.jsp

Cannot instantiate the type ArrayList<?>

1: <%

2: java.util.List<String>  list = new java.util.ArrayList<>();

3: list.add( "hello world" );

4: out.println( list );

5: %>

JBWEB004060: An error occurred at line: 2 in the jsp file: /wtcore/java7test.jsp

Syntax error on token "<", ? expected after this token

1: <%

2: java.util.List<String>  list = new java.util.ArrayList<>();

3: list.add( "hello world" );

4: out.println( list );

5: %>

JBWEB004211: Stacktrace:

    at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:85) [jastow-1.0.0.Final.jar:1.0.0.Final]

    at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:69) [jastow-1.0.0.Final.jar:1.0.0.Final]

    at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:451) [jastow-1.0.0.Final.jar:1.0.0.Final]

    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:361) [jastow-1.0.0.Final.jar:1.0.0.Final]

    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:339) [jastow-1.0.0.Final.jar:1.0.0.Final]

    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:326) [jastow-1.0.0.Final.jar:1.0.0.Final]

    at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:604) [jastow-1.0.0.Final.jar:1.0.0.Final]

    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:309) [jastow-1.0.0.Final.jar:1.0.0.Final]

    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:326) [jastow-1.0.0.Final.jar:1.0.0.Final]

    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259) [jastow-1.0.0.Final.jar:1.0.0.Final]

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [jboss-servlet-api_3.1_spec-1.0.0.Final.jar:1.0.0.Final]

    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]

    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:130) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]

    at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:66) [guice-servlet.jar:]

    at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:168) [guice-servlet.jar:]

    at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58) [guice-servlet.jar:]

    at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118) [guice-servlet.jar:]

    at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113) [guice-servlet.jar:]

    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:56) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]

    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:132) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]

    .... application filters follow .....

P.S. Wildfly 8.1.0 is kind of out of the picture at the moment for me.

[ctomc]

This looks like some strange bug as it should work without any issue.

can you please create bug in WildFly - JBoss Issue Tracker report with simple case to reproduce it.

thank you.

[ctomc]

Ah never mind, just noticed you are talking about 8.0.0.

Before creating bug report can you verify first that it also doesn't work in 8.1.0.

As we did a major compiler upgrade in 8.1 to make it support java 8 syntax.

[jessholle]

Of course, 8.0.0 should have worked with Java 7 syntax, right?

Java 8 syntax I certainly wouldn't expect to work until 8.1.0.

[ctomc]

Jess Holle wrote:

Of course, 8.0.0 should have worked with Java 7 syntax, right?

Java 8 syntax I certainly wouldn't expect to work until 8.1.0.

Not really, we had some mash-up with what compiler was used, proper one supporting the JDK7 was used in build, but it never ended up in end result distro.

where really old one was used...

[ctomc]

Anyhow, you can manually fix it in 8.0.

see my reply in this thread wildfly-8.0.0.Final w/ jdk1.8.0

[jessholle]

Ah, yes, that fixed it.  Thanks!