Firebase管理SDK-java.lang.NoClassDefoundError

Question

我试图将Firebase Admin SDK添加到我的Java Web应用程序中，但在init上出现以下错误：

java.lang.NoClassDefFoundError: com/google/firebase/FirebaseOptions
        at backend.servlets.Init.contextInitialized(Init.java:33)

我将Firebase依赖项添加到pom.xml文件中，并使用以下代码初始化Firebase：ClassLoader ClassLoader=Thread.currentThread（）.GetContextClassLoader（）；InputStream为=ClassLoader.GetResourceStream（“ServiceAccount.json”）；

    FirebaseOptions options = null;
    try {
        options = FirebaseOptions.builder()
                .setCredentials(GoogleCredentials.fromStream(is))
                .build();
    } catch (IOException e) {
        e.printStackTrace();
    }

    FirebaseApp.initializeApp(options);+

有人能帮我吗？

Answer 1

这里有一个您可以使用的实现；

您可能需要使用@PostConstruct注释。

引用-为什么使用@PostConstruct？

建议的实施

package com.test.config;

import java.io.FileInputStream;

import javax.annotation.PostConstruct;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.ResourceUtils;

import com.google.auth.oauth2.GoogleCredentials;
import com.google.firebase.FirebaseApp;
import com.google.firebase.FirebaseOptions;
import com.google.firebase.messaging.FirebaseMessaging;

@Configuration
public class FirebaseConfig {

    @Bean
    public FirebaseMessaging firebaseMessaging() {
        FirebaseMessaging firebase = FirebaseMessaging.getInstance();
        return firebase;
    }

    @PostConstruct
    public void init() {

        try (FileInputStream serviceAccount = new FileInputStream(
                ResourceUtils.getFile("classpath:ServiceAccount.json"));) {

            @SuppressWarnings("deprecation")
            FirebaseOptions options = new FirebaseOptions.Builder()
                    .setCredentials(GoogleCredentials.fromStream(serviceAccount)).build();
            if (FirebaseApp.getApps().isEmpty()) {
                FirebaseApp.initializeApp(options);
            }

            System.out.println("#####Firebase Initialized#####");

        } catch (Exception e) {
            System.out.println(e.getMessage());
        }

    }

}