Lambda expressions in JSP files will not compile

Question

I've tried most of the suggestions mentioned on stackoverflow but haven't come across a solution yet. The error I'm being presented with is the following.

An error occurred at line: 379 in the jsp file: /application-new-project_process.jsp
Lambda expressions are allowed only at source level 1.8 or above 

I'm using IntelliJ IDEA 2016.2 and have applied these settings.

Project Structure → Project, Project SDK to 1.8 (java version "1.8.0_102")

Project Structure → Project, Project Language Level to 8.0 - Lambdas, type annotations etc.

Settings → Build, Execution, Deployment → Compiler → Java Compiler, Project bytecode version to 1.8

Settings → Build, Execution, Deployment → Compiler → Java Compiler, Target bytecode version to 1.8

I'm using Tomcat v8.0.36 and have the following for JSP servlets.

<servlet>
    <servlet-name>jsp</servlet-name>
    <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
    <init-param>
        <param-name>fork</param-name>
        <param-value>false</param-value>
    </init-param>
    <init-param>
        <param-name>xpoweredBy</param-name>
        <param-value>false</param-value>
    </init-param>
    <init-param> 
        <param-name>compiler</param-name> 
        <param-value>modern</param-value> 
    </init-param> 
    <init-param> 
        <param-name>compilerSourceVM</param-name> 
        <param-value>1.8</param-value> 
    </init-param> 
    <init-param> 
        <param-name>compilerTargetVM</param-name> 
        <param-value>1.8</param-value> 
    </init-param> 
    <init-param> 
        <param-name>suppressSmap</param-name> 
        <param-value>true</param-value> 
    </init-param> 
    <load-on-startup>3</load-on-startup>
</servlet>

Any suggestions will be greatly appreciated!

Answer 1

I use IntelliJ IDEA 2016.3.2, tomcat apache-tomcat-8.5.8, following changes are sufficient for me:
1. Change following file: apache-tomcat-8.5.8\conf\web.xml
2. Modify configuration for

 <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>

3. Add following init params:
   

   <init-param>
     <param-name>compilerSourceVM</param-name>
     <param-value>1.8</param-value>
   </init-param>
   <init-param>
     <param-name>compilerTargetVM</param-name>
     <param-value>1.8</param-value>
   </init-param>
   

Finish.