Josh Hsu

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jsp 錯誤記錄 - References to interface static methods are allowed only at source level 1.8 or above

> References to interface static methods are allowed only at source level 1.8 or above

jsp 錯誤記錄 - References to interface static methods are allowed only at source level 1.8 or above

References to interface static methods are allowed only at source level 1.8 or above

最近前端相關相對比較少所以被指派去寫 jsp 的專案，但我在 local 端都起不來，然後其他後端又都是改一改直接上 sever 所以他們也很久沒有在 local 端跑過了， 然後我改了幾次也部署了幾次造成了線上的 Tomcat run out of memory 要重啟，

JAVA 我用了jenv來做版本控制、nvm 隨便裝，Tomcat 試了 7.x、8.x、9.x 都沒有辦法

❯ mvn -v
Apache Maven 3.8.8 (4c87b05d9aedce574290d1acc98575ed5eb6cd39)
Maven home: /usr/local/apache-maven-3.8.8
Java version: 1.8.0_372, vendor: Azul Systems, Inc., runtime: /Library/Java/JavaVirtualMachines/zulu-8.jdk/Contents/Home/jre
Default locale: zh_TW, platform encoding: UTF-8
OS name: "mac os x", version: "13.3.1", arch: "aarch64", family: "mac"

換了一堆版本跟 IDE 依舊噴 "References to interface static methods are allowed only at source level 1.8 or above"

拿了這個錯誤訊息在 Google 中尋找了 3 天，最後找到了答案發現原來就在搜尋結果前幾個，然後我也很早就看過，但不覺得是答案，後面發現有點過了就沒有再點開來仔細看...

#解法 Solution

可以收尋

org.apache.jasper.servlet.JspServlet 
// apache-tomcat-8.5.8\conf\web.xml
<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>
    // 加上以下這段
    <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>
    <load-on-startup>3</load-on-startup>
</servlet>

#結論

總結來講排錯的時間我斷斷續續花了 3 天

後面寫 jsp 功能寫了一天，覺得好麻煩..

最後我想說一句，都 2023 年了還在用 jsp ?

#Ref

Lambda expressions in JSP files will not compile

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