在Java 7和Tomcat 7的JSP中，字符串不适用于Switch情况

Question

I am using jdk1.7.0 and tomcat 7.0.27

A program of switch case with String parameter is working fine in JAVA but same program is not working with JSP.

An error Occurred : "Cannot switch on a value of type String for source level below 1.7. Only convertible int values or enum constants are permitted"

Any suggestions for resolving this issue.

Answer 1

Apparently, you have to specify what version of Java should be used when compiling JSPs.

Add this compilerTargetVM init-param in tomcat/conf/web.xml (here I'm targeting Java 8):

<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>compilerTargetVM</param-name>
        <param-value>1.8</param-value>
    </init-param>      
    <load-on-startup>3</load-on-startup>
</servlet>