如何製作java後端Firebase數據庫連接

Question

我想用java將條目插入我的Firebase數據庫（java不在android環境中）。這甚至有可能嗎？

如果可以請你幫我弄清楚，爲什麼我得到這個錯誤：在eclipse

Exception in thread "main" java.lang.NoSuchMethodError: com.google.firebase.FirebaseOptions$Builder.setCredential(Lcom/google/firebase/auth/FirebaseCredential;)Lcom/google/firebase/FirebaseOptions$Builder;

出現該問題在`setCredential線以下的在我的Maven項目？

try { 
     FileInputStream serviceAccount = new FileInputStream(file); 
     FirebaseOptions options = new FirebaseOptions.Builder() 
       .setCredential(FirebaseCredentials.fromCertificate(serviceAccount)) 
       .setDatabaseUrl(url) 
       .build(); 
     FirebaseApp.initializeApp(options); 
    } catch (FileNotFoundException e) { 
     System.out.println("ERROR: invalid service account credentials. See README."); 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

    // Shared Database reference 
    DatabaseReference database = FirebaseDatabase.getInstance().getReference(); 

Answer 1

從錯誤消息看來，您似乎包含錯誤的SDK，可能是Android平臺的SDK。確保您按照Firebase documentation on including the Admin SDK中的說明操作。從那裏：

The Firebase Admin Java SDK is published to the Maven central repository. To install the library, declare it as a dependency in your build.gradle file:

dependencies { 
    compile 'com.google.firebase:firebase-admin:5.2.0' 
} 

If you use Maven to build your application, you can add the following dependency to your pom.xml :

<dependency> 
    <groupId>com.google.firebase</groupId> 
    <artifactId>firebase-admin</artifactId> 
    <version>5.2.0</version> 
</dependency>