将spring boot部署到google app engine flexible env时出现错误404

Question

在将spring boot应用程序部署到google app engine flexible Env时，我面临着一个问题。我只想在GAE flexible env中部署，因为我已经在该环境上运行了一些服务（在同一个gcp项目中）。所以我想把它作为一个新的单独的服务来部署，我可以配置、调度文件来运行微服务系统。

Exception in thread "main" java.lang.IllegalStateException: No Available Context
    at com.google.cloud.runtimes.jetty9.DeploymentCheck.lifeCycleStarted(DeploymentCheck.java:46)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.setStarted(AbstractLifeCycle.java:179)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:69)
    at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1511)
    at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1438)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:1437)

在Jetty无法在appengine中灵活地启动Spring Boot应用程序后，我尝试了解决方案

下面是我的pom.xml文件：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <maven.compiler.source>${java.version}</maven.compiler.source> <!-- REQUIRED -->
    <maven.compiler.target>${java.version}</maven.compiler.target> <!-- REQUIRED -->
</properties>


<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>tomcat-juli</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <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.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jetty</artifactId>
        <scope>provided</scope>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>web-socket</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>

    <dependency>
        <groupId>com.zaxxer</groupId>
        <artifactId>HikariCP</artifactId>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-jasper</artifactId>
        <scope>provided</scope>
    </dependency>

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
        <scope>provided</scope>
    </dependency>

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

    <dependency>
        <groupId>postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>9.1-901.jdbc4</version>
    </dependency>

</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>repackage</goal>
                    </goals>
                    <configuration>
                        <mainClass>com.kevin.SpringJqgridApplication</mainClass>
                    </configuration>
                </execution>
            </executions>
        </plugin>
        <plugin>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-maven-plugin</artifactId>
            <version>9.4.6.v20170531</version>
        </plugin>
        <!-- START plugin -->
        <plugin>
            <groupId>com.google.cloud.tools</groupId>
            <artifactId>appengine-maven-plugin</artifactId>
            <version>1.3.1</version>
        </plugin>
        <!-- END plugin -->
    </plugins>
</build>

有人能帮忙解决这个问题吗？谢了。

Answer 1

我遇到过几次同样的问题，有几个潜在的解决方案：

>

是否有类似以下内容的目录/文件结构:webapp/WEB-INF/appengine-web.xml？如果您有该文件，并且正在使用maven插件进行部署，它可能会尝试按标准部署，并导致抛出IllegalStateException错误。解决方案：完全删除webapp目录（它仅用于AppEngine标准配置）。就我个人而言，这是我今天早上收到的IllegalStateException的解决方案。

我在另一个应用程序中也遇到了同样的问题，解决方案是确保您在AppEngine的Spring Boot应用程序中获得了Jetty所需的ServletInitializer。在这里看到更多。

你有信心Spring Boot应用程序正确运行吗？当未能提供必要的环境变量时，我收到了这个错误，当应用程序试图运行时会导致问题。一个（有效的）示例可能如下所示，确保将相应的环境变量添加到app.yaml中：

app.yaml：

env_variables:spring_profiles_active:“qa”

对于这两种情况，我都没有包含spring boot jetty依赖项，而是包含了我的构建。Gradle如下所示：

compile(group: 'javax.servlet', name: 'javax.servlet-api', version: '4.0.1')
compile(group: 'org.springframework.boot', name: 'spring-boot-starter-web', version: '2.0.2.RELEASE') {
    // GAE runs on Jetty, not Tomcat, must manually disable
    exclude(group: 'org.springframework.boot', module: 'spring-boot-starter-tomcat')
}
compile(group: 'org.springframework.boot', name: 'spring-boot-starter-data-jpa', version: '2.0.5.RELEASE')
compile(group: 'com.google.appengine', name: 'appengine-api-1.0-sdk', version: '1.9.63')
compile(group: 'org.projectlombok', name: 'lombok', version: '1.18.2') {
    exclude(group: 'org.slf4j', module: 'jul-to-slf4j')
}