Google App Engine SpringBoot JSR-356 支持不可用异常

Question

我正在尝试将一个 springboot 项目转换为在 GAE 上运行。到目前为止，我能够将项目连接到本地的云sql。

但是，在转换为应用程序引擎标准(部署它(时，请遵循几个指南/教程，例如

https://codelabs.developers.google.com/codelabs/cloud-app-engine-springboot/index.html?index=..%2F..%2Findex#4

每当我启动 GAE 开发服务器或部署时，我都会看到以下异常。

    [INFO] GCLOUD: javax.servlet.ServletException: Not running on Jetty, JSR-356 support unavailable
    [INFO] GCLOUD:  at org.eclipse.jetty.websocket.jsr356.server.deploy.WebSocketServerContainerInitializer.onStartup(WebSocketServerContainerInitializer.java:193)
    [INFO] GCLOUD:  at org.eclipse.jetty.plus.annotation.ContainerInitializer.callStartup(ContainerInitializer.java:140)
    [INFO] GCLOUD:  at org.eclipse.jetty.annotations.ServletContainerInitializersStarter.doStart(ServletContainerInitializersStarter.java:63)
    [INFO] GCLOUD:  at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    [INFO] GCLOUD:  at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:330)
    [INFO] GCLOUD:  at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1406)
    [INFO] GCLOUD:  at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1368)
    [INFO] GCLOUD:  at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:778)
    [INFO] GCLOUD:  at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:262)
    [INFO] GCLOUD:  at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:522)
    [INFO] GCLOUD:  at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    [INFO] GCLOUD:  at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:131)
    [INFO] GCLOUD:  at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:105)
    [INFO] GCLOUD:  at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
    [INFO] GCLOUD:  at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    [INFO] GCLOUD:  at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:131)
    [INFO] GCLOUD:  at org.eclipse.jetty.server.Server.start(Server.java:422)
    [INFO] GCLOUD:  at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:105)
    [INFO] GCLOUD:  at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
    [INFO] GCLOUD:  at org.eclipse.jetty.server.Server.doStart(Server.java:389)
    [INFO] GCLOUD:  at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    [INFO] GCLOUD:  at com.google.appengine.tools.development.jetty9.JettyContainerService.startContainer(JettyContainerService.java:346)
    [INFO] GCLOUD:  at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:284)
    [INFO] GCLOUD:  at com.google.appengine.tools.development.AutomaticInstanceHolder.startUp(AutomaticInstanceHolder.java:26)
    [INFO] GCLOUD:  at com.google.appengine.tools.development.AbstractModule.startup(AbstractModule.java:87)
    [INFO] GCLOUD:  at com.google.appengine.tools.development.Modules.startup(Modules.java:105)
    [INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerImpl.doStart(DevAppServerImpl.java:274)
    [INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerImpl.access$000(DevAppServerImpl.java:47)
    [INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerImpl$1.run(DevAppServerImpl.java:219)
    [INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerImpl$1.run(DevAppServerImpl.java:217)
    [INFO] GCLOUD:  at java.security.AccessController.doPrivileged(Native Method)
    [INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:217)
    [INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:368)
    [INFO] GCLOUD:  at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:45)
    [INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerMain.run(DevAppServerMain.java:223)
    [INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:214)

由于我可以使用嵌入式 Jetty 很好地运行该项目，因此我认为这是一个配置/pom 问题。更具体地说，我知道应用程序引擎不支持JSR 356，Websocket api。但是，我没有看到的是我当前的项目如何依赖于 websocket，因为我不记得配置 websocket，或者根本不会在项目中使用它......

有人可以看看我的pom.xml并指出是否有任何我不知道的websocket依赖项吗？

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</properties>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
</parent>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-tomcat</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>jul-to-slf4j</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
        <scope>provided</scope>
    </dependency>

    <!-- google map services -->
    <dependency>
        <groupId>com.google.maps</groupId>
        <artifactId>google-maps-services</artifactId>
        <version>0.2.6</version>
    </dependency>
    <!-- db related-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.slf4j</groupId>
                <artifactId>jul-to-slf4j</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>com.google.cloud.sql</groupId>
        <artifactId>postgres-socket-factory</artifactId>
        <version>1.0.5</version>
    </dependency>
    <dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>42.2.1</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-spatial</artifactId>
        <version>5.1.0.Final</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>
<repositories>
    <repository>
        <id>maven2-repository.dev.java.net</id>
        <name>Java.net repository</name>
        <url>http://download.java.net/maven/2</url>
    </repository>
    <repository>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
        <id>boundless</id>
        <name>Boundless Maven Repository</name>
        <url>http://repo.boundlessgeo.com/main</url>
    </repository>
</repositories>
<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
        <plugin>
            <groupId>com.google.cloud.tools</groupId>
            <artifactId>appengine-maven-plugin</artifactId>
            <version>1.3.1</version>
        </plugin>
    </plugins>
</build>

Answer 1

我仍然不确定为什么会发生 websocket 错误，但对我来说，它已通过执行以下 2 个步骤来解决：

1 升级弹簧启动启动器父版本

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.10.RELEASE</version>
</parent>

2 删除目标文件夹