Question

尝试在IntelliJ IDEA（2016.3）中运行Java Quickstart示例Gmail API项目：

https://developers.google.com/gmail/api/quickstart/java

我认为所需的JAR已添加到项目中。

运行项目我得到：

Apr 12, 2017 8:27:34 AM com.google.api.client.util.store.FileDataStoreFactory setPermissionsToOwnerOnly
WARNING: unable to change permissions for everybody: C:\Users\xxx\.credentials\some-project-name
Apr 12, 2017 8:27:34 AM com.google.api.client.util.store.FileDataStoreFactory setPermissionsToOwnerOnly
WARNING: unable to change permissions for owner: C:\Users\xxx\.credentials\some-project-name
Exception in thread "main" java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest
    at com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver.getRedirectUri(LocalServerReceiver.java:98)
    at com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp.authorize(AuthorizationCodeInstalledApp.java:76)
    at Main.authorize(Main.java:98)
    at Main.getGmailService(Main.java:112)
    at Main.main(Main.java:123)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

如何摆脱这个错误并运行项目？

JSON文件到位，当我删除它时，我得到＆＃34;找不到文件＆＃34; json文件的getGmailService（）中的IOException。

Main.authorize（Main.java:98）是

        Credential credential = new AuthorizationCodeInstalledApp(
            flow, new LocalServerReceiver()).authorize("user");

Main.getGmailService（Main.java:112）是

        Credential credential = authorize();

公共静态Gmail中的

getGmailService（）会抛出IOException {。

getGmailService（）和authorize（）定义为：

    public static Gmail getGmailService() throws IOException {
    Credential credential = authorize();
    return new Gmail.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)
            .setApplicationName(APPLICATION_NAME)
            .build();
}

授权（）

    public static Credential authorize() throws IOException {
    // Load client secrets.
    //System.err.println("Main.class.getResourceAsStream("/"): "+Main.class.getResourceAsStream("/")); // debug
    //InputStream in = Main.class.getResourceAsStream("/client_secret.json");
    File jsonFile = new File("client_secret.json");
    InputStream in = new FileInputStream(jsonFile);
    GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));

    // Build flow and trigger user authorization request.
    GoogleAuthorizationCodeFlow flow =
            new GoogleAuthorizationCodeFlow.Builder(
                    HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, SCOPES)
                    .setDataStoreFactory(DATA_STORE_FACTORY)
                    .setAccessType("offline")
                    .build();
    Credential credential = new AuthorizationCodeInstalledApp(
            flow, new LocalServerReceiver()).authorize("user");
    System.out.println(
            "Credentials saved to " + DATA_STORE_DIR.getAbsolutePath());
    return credential;
}

Answer 1

您缺少必需的JAR文件，特别是javax.servlet-api

您可以手动下载from mvnrepository，然后您需要add it to your dependencies in IntelliJ IDEA。或者，如果您正在使用Gradle或Maven，请使用mvn repo页面上的设置将依赖项添加到build.gradle文件或pom.xml。

Answer 2

感谢Trisha，但我设法以不同的方式解决了这个问题 - 我必须通过访问提供的链接和登录gmail帐户来授权访问Google Developers Console中的项目。新凭据现在存储在.credentials目录中，错误消失。

IntelliJ Idea Gmail API项目

2 个答案: