java spring firebase应用程序默认凭据不可用

我试图用java和spring配置firebase realtimedb，但总是得到凭证错误。这很奇怪，因为我在api文档中一步一步地去google。以下文件：https://firebase.google.com/docs/database/admin/start?hl=en 请看一看，给我一些建议，因为我不知道还能做什么。
简单地解释一下我的代码，首先在类声明之后，我得到application.property文件中包含的全局变量的值，如下所示：

@Value("${firebase.service_account_key_path}")
private String serviceAccountKey;
@Value("${firebase.db_url}")
private String dbUrl;

这些变量包含servicekey json和firebase db\u url
然后在第二步中，我调用init（）方法，该方法包含获取firebase凭证的google snip并启动应用程序。

@PostConstruct
private void init(){
    if(serviceAccountKey==null || dbUrl==null)
        throw new NameRegistryException(ErrorHandler.EFIREBASEER01);

    try{
        FileInputStream serviceAccount = new FileInputStream(serviceAccountKey);

        FirebaseOptions options = new FirebaseOptions.Builder()
                .setCredentials(GoogleCredentials.fromStream(serviceAccount))
                .setDatabaseUrl(dbUrl)
                .build();

        FirebaseApp.initializeApp(options);
    }catch (Exception e){
        e.printStackTrace();
        return;

    }
}

我引用的属性是：

firebase.service_account_key_path: src/main/resources/xxxxxxxxxx.json
firebase.db_url: https://xxxxxxxxx.firebaseio.com

在init（）方法调用期间正确地找到了文件json，因此不存在nullpointexception问题。
问题是，当我测试应用程序时，总是得到以下消息：

java.lang.IllegalStateException: Failed to load ApplicationContext

at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:132)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:124)
at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:190)
at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:132)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:244)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'firestoreOptions' defined in class path resource [com/google/cloud/spring/autoconfigure/firestore/GcpFirestoreAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.google.cloud.firestore.FirestoreOptions]: Factory method 'firestoreOptions' threw exception; nested exception is java.lang.RuntimeException: Failed to obtain credentials
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:486)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1334)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:782)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:774)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:439)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:339)
    at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:123)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
    ... 25 more
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.google.cloud.firestore.FirestoreOptions]: Factory method 'firestoreOptions' threw exception; nested exception is java.lang.RuntimeException: Failed to obtain credentials
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653)
    ... 44 more
Caused by: java.lang.RuntimeException: Failed to obtain credentials
    at com.google.cloud.firestore.FirestoreOptions$Builder.build(FirestoreOptions.java:212)
    at com.google.cloud.spring.autoconfigure.firestore.GcpFirestoreAutoConfiguration.firestoreOptions(GcpFirestoreAutoConfiguration.java:103)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
    ... 45 more
Caused by: java.io.IOException: The Application Default Credentials are not available. They are available if running in Google Compute Engine. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.
    at com.google.auth.oauth2.DefaultCredentialsProvider.getDefaultCredentials(DefaultCredentialsProvider.java:134)
    at com.google.auth.oauth2.GoogleCredentials.getApplicationDefault(GoogleCredentials.java:119)
    at com.google.auth.oauth2.GoogleCredentials.getApplicationDefault(GoogleCredentials.java:91)
    at com.google.api.gax.core.GoogleCredentialsProvider.getCredentials(GoogleCredentialsProvider.java:67)
    at com.google.cloud.spring.core.DefaultCredentialsProvider.getCredentials(DefaultCredentialsProvider.java:67)
    at com.google.cloud.firestore.FirestoreOptions$Builder.build(FirestoreOptions.java:210)
    ... 51 more

我错过了什么？！我不知道还能做什么。。我也试着跟着这个https://cloud.google.com/docs/authentication/getting-started. 我在一个类似问题的回答中发现了它，但它并没有解决我的问题。

java spring firebase应用程序默认凭据不可用

暂无答案！

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