JSP文件中的Lambda表达式将无法编译 [英] Lambda expressions in JSP files will not compile

问题描述

我已经尝试了关于stackoverflow的大多数建议，但是还没有找到解决方案.我遇到的错误如下.

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 

我正在使用 IntelliJ IDEA 2016.2 ，并且已经应用​​了这些设置.

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

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

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

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

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

我正在使用 Tomcat v8.0.36 ，并且对JSP servlet具有以下要求.

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>

任何建议将不胜感激！

推荐答案

我使用IntelliJ IDEA 2016.3.2，tomcat apache-tomcat-8.5.8，以下更改对我来说足够了:
1.更改以下文件:apache-tomcat-8.5.8 \ conf \ web.xml
2.修改

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>

1. 添加以下初始化参数:
   

1. 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>

<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>

完成.

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