问题描述
我收到以下错误...
An error occurred at line: 23 in the jsp file: /blah/blah/email-option.jsp
Lambda expressions are allowed only at source level 1.8 or above
20: @SuppressWarnings("Convert2Diamond")
21: final List<String> emails = Optional
22: .ofNullable(request.getAttribute("email"))
23: .map(v -> (List<String>)v)
24: .orElse(new ArrayList<String>());
25: @SuppressWarnings("Convert2Diamond")
26: final List<String> emailConfirms = Optional
这不会发生在我的工作站上。我正在使用 tomcat 7.0.103,并且有以下 web.xml jsp servlet 设置...
<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>
redhat 7 上的 Tomcat 7.0.76 似乎不喜欢它。有没有办法让它工作?
解决方法
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