在Google App Engine Standard上运行Spring Boot Application时发生javax.el.E​​xpressionFactory错误

问题描述

我正在尝试在Google App Engine上部署Spring Boot应用程序，但是在尝试调用与该应用程序关联的任何API时收到以下错误日志.

I am trying to deploy my Spring Boot application on Google App Engine, however I receive the following error logs when attempting to call any of the APIs associated with the app.

但是，仅当我在Google App Engine上运行我的应用程序时，才会发生此错误.如果我在本地打包并运行它，则该应用程序将按预期运行.

However, this error only occurs when I run my app on Google App Engine. If I package it locally and run it, the app works as expected.

有什么想法可能导致此问题?谢谢！

Any ideas what might be causing this issue? Thanks you!

推荐答案

确保您具有el依赖项；

Make sure you have the el dependency;

    <dependency>
        <groupId>org.glassfish</groupId>
        <artifactId>javax.el</artifactId>
        <version>3.0.1-b08</version>
    </dependency>

还要在您的appengine-web.xml中添加一个env-variables条目；

Also add a env-variables entry to your appengine-web.xml;

    <env-variables>
        <env-var name="javax.el.ExpressionFactory" value="com.sun.el.ExpressionFactoryImpl" />
    </env-variables>

并添加文件"META-INF/services/javax.el.E​​xpressionFactory"内容:

And add the file 'META-INF/services/javax.el.ExpressionFactory'with the contents:

    com.sun.el.ExpressionFactoryImpl

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