Google 应用引擎无法创建 DevAppServer

Question

在尝试创建本地应用程序服务器来测试我的 web 应用程序时，我完全无法这样做。 其他人在这里看到了同样的错误，并被告知这是 JDK>12 的问题，但是我只使用 java 8。我可以正常部署应用程序，但不能创建本地服务器。 我已经通过 powershell 使用本机 gcloud CLI、使用 intellij 插件以及现在通过 maven 插件进行了尝试，并且每次都遇到相同的问题。 任何帮助将非常感激。

堆栈跟踪

Apr 18, 2020 9:27:22 PM com.google.cloud.tools.appengine.operations.DevAppServerRunner run
INFO: submitting command: C:\Program Files\Java\jdk-14.0.1\bin\java.exe -Duse_jetty9_runtime=true -D--enable_all_permissions=true -Dappengine.sdk.root=C:\Users\samth\AppData\Local\google\ct4j-cloud-sdk\LATEST\google-cloud-sdk\platform\google_appengine\google\appengine\tools\java -cp C:\Users\samth\AppData\Local\google\ct4j-cloud-sdk\LATEST\google-cloud-sdk\platform\google_appengine\google\appengine\tools\java\lib\appengine-tools-api.jar com.google.appengine.tools.development.DevAppServerMain --allow_remote_shutdown --disable_update_check --no_java_agent C:\Users\samth\Documents\FiveCsWebsite\target\5CsWebsite-localtest
[INFO] GCLOUD: WARNING: An illegal reflective access operation has occurred
[INFO] GCLOUD: WARNING: Illegal reflective access by com.google.appengine.tools.development.StreamHandlerFactory (file:/C:/Users/samth/AppData/Local/google/ct4j-cloud-sdk/LATEST/google-cloud-sdk/platform/google_appengine/google/appengine/tools/java/lib/impl/appengine-local-runtime.jar) to method java.net.URL.getURLStreamHandler(java.lang.String)
[INFO] GCLOUD: WARNING: Please consider reporting this to the maintainers of com.google.appengine.tools.development.StreamHandlerFactory
[INFO] GCLOUD: WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
[INFO] GCLOUD: WARNING: All illegal access operations will be denied in a future release
[INFO] GCLOUD: java.lang.RuntimeException: Unable to create a DevAppServer
[INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerFactory.doCreateDevAppServer(DevAppServerFactory.java:369)
[INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer(DevAppServerFactory.java:301)
[INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:383)
[INFO] GCLOUD:  at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:45)
[INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerMain.run(DevAppServerMain.java:257)
[INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:248)
[INFO] GCLOUD: Caused by: java.lang.ExceptionInInitializerError
[INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerImpl.<init>(DevAppServerImpl.java:124)
[INFO] GCLOUD:  at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[INFO] GCLOUD:  at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
[INFO] GCLOUD:  at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
[INFO] GCLOUD:  at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
[INFO] GCLOUD:  at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
[INFO] GCLOUD:  at com.google.appengine.tools.development.DevAppServerFactory.doCreateDevAppServer(DevAppServerFactory.java:354)
[INFO] GCLOUD:  ... 5 more
[INFO] GCLOUD: Caused by: java.lang.IllegalStateException: java.lang.NoSuchMethodException: java.net.SocksSocketImpl.<init>()
[INFO] GCLOUD:  at com.google.appengine.tools.development.DevSocketImplFactory.<clinit>(DevSocketImplFactory.java:76)
[INFO] GCLOUD:  ... 12 more
[INFO] GCLOUD: Caused by: java.lang.NoSuchMethodException: java.net.SocksSocketImpl.<init>()
[INFO] GCLOUD:  at java.base/java.lang.Class.getConstructor0(Class.java:3427)
[INFO] GCLOUD:  at java.base/java.lang.Class.getDeclaredConstructor(Class.java:2631)
[INFO] GCLOUD:  at com.google.appengine.tools.development.DevSocketImplFactory.<clinit>(DevSocketImplFactory.java:72)
[INFO] GCLOUD:  ... 12 more

pom.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <groupId>org.fivecs.website</groupId>
    <artifactId>5CsWebsite</artifactId>
    <packaging>war</packaging>
    <version>localtest</version>

    <build>
        <plugins>
            <plugin>
                <groupId>com.google.cloud.tools</groupId>
                <artifactId>appengine-maven-plugin</artifactId>
                <version>2.2.0</version>
                <configuration>
                    <deploy.projectId>fivecs-1088</deploy.projectId>
    <!--                 will be the version number visible on google cloud platform-->
                    <deploy.version>13</deploy.version>

    <!--                 release the version immediately-->
                    <deploy.promote>false</deploy.promote>
                </configuration>
            </plugin>
        </plugins>
    </build>


    <dependencies>

        <dependency>
            <groupId>com.google.appengine</groupId>
            <artifactId>appengine-api-1.0-sdk</artifactId>
            <version>1.9.76</version>
        </dependency>

        <dependency>
            <groupId>com.google.oauth-client</groupId>
            <artifactId>google-oauth-client-appengine</artifactId>
            <version>1.25.0</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>

        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.6</version>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.5</version>
        </dependency>

    </dependencies>

</project>

Answer 1

我遇到了同样的问题，经过几个小时的几乎所有尝试后，我发现您可以将应用程序从java8迁移到java11作为独立应用程序。 完成此操作后，我的应用程序现在在部署时可以在本地和远程运行。

这对我有用。

我删除了main/webapp/WEB-INF/appengine-web.xml文件并创建了main/appengine/app.yaml文件，仅指定了这个

runtime: java11

我删除了war插件并添加了application ，然后我指定了

application {
    mainClassName = "my.package.Main"
}

不确定这是否有必要，但我也更新了这个

java {
    sourceCompatibility = JavaVersion.VERSION_11
}

---

与您的问题无关，但可能对其他人有帮助。 由于我使用的是 Kotlin，因此我还必须将main function 与Main class 包装起来，并使其像 ZA8229ZDFCEF456E591

@SpringBootApplication
class MyApplication

object Main {
    @JvmStatic
    fun main(args: Array<String>) {
        runApplication<MyApplication>(*args) {
            setBannerMode(Banner.Mode.OFF)
        }
    }
}

Answer 2

要使用 java8，您需要将其指定为 1.8

baeldung.com/maven-java-version#compiler