Spring Boot可以找到资源文件,但Java类因NullPointerException而失败

2019年7月28日 156次阅读

我正在开发一个项目,在一个类中我需要加载json文件src / main / resources.

src/ 
   main/java/FirebaseTokenVerifier
   main/resources/staging_firebase.json

ForebaseTokenVerifier类在构造函数中加载此JSON文件

@Component
public class FirebaseTokenVerifier implements TokenVerifier {

  private FirebaseAuth firebaseAuth;

  // TODO (hhimanshu): resourceFile and DatabaseURL are hardcoded, this should be picked by external file
  // or should be picked up conditionally based on environment
  public FirebaseTokenVerifier() throws IOException, URISyntaxException {
    final String resourceName = "staging_firebase.json";
    System.out.println("Getting Resource: " + resourceName);
    Path path = Paths.get(ClassLoader.getSystemClassLoader().getResource(resourceName).toURI());

    FileInputStream serviceAccount = new FileInputStream(path.toFile());
    FirebaseOptions options = new FirebaseOptions.Builder()
        .setCredential(FirebaseCredentials.fromCertificate(serviceAccount))
        .setDatabaseUrl("https://staging-myapp.firebaseio.com")
        .build();

    FirebaseApp defaultApp = FirebaseApp.initializeApp(options);
    firebaseAuth = FirebaseAuth.getInstance(defaultApp);

  }
 /// more things here .....
}

当我运行mvn spring-boot：run时,我看到json文件正确加载为

2017-07-26 15:57:33.611  INFO 49104 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2017-07-26 15:57:33.611  INFO 49104 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1424 ms
Getting Resource: staging_firebase.json
2017-07-26 15:57:33.799  INFO 49104 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]

一切正常.然后我尝试做以下事情

 mvn clean package; java -jar target/myapp-core-0.0.1-SNAPSHOT.jar

但这在运行时失败了

at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:189) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1193) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1095) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:835) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    ... 35 common frames omitted
    Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'firebaseTokenVerifier' defined in URL [jar:file:/Users/Harit.Himanshu/bl/sources/idea/myapp-core/targ
    et/myapp-core-0.0.1-SNAPSHOT.jar!/BOOT-INF/classes!/com/myapp/api/auth/FirebaseTokenVerifier.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationEx
    ception: Failed to instantiate [com.myapp.api.auth.FirebaseTokenVerifier]: Constructor threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1155) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1099) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:835) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    ... 49 common frames omitted
    Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.myapp.api.auth.FirebaseTokenVerifier]: Constructor threw exception; nested exception is java.lang.NullPointe
    rException
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:154) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1147) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    ... 61 common frames omitted
    Caused by: java.lang.NullPointerException: null
    at com.myapp.api.auth.FirebaseTokenVerifier.<init>(FirebaseTokenVerifier.java:31) ~[classes!/:0.0.1-SNAPSHOT]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_131]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_131]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_131]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_131]
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:142) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    ... 63 common frames omitted

它在L31上失败了

Path path = Paths.get(ClassLoader.getSystemClassLoader().getResource(resourceName).toURI());

我还确认json文件存在于jar文件中

✗ jar -tvf target/myapp-core-0.0.1-SNAPSHOT.jar| grep json
  2355 Wed Jul 26 16:00:44 NZST 2017 BOOT-INF/classes/staging_firebase.json
 64952 Tue Jan 07 19:29:24 NZDT 2014 BOOT-INF/lib/json-20140107.jar

这里出了什么问题？为什么Spring-Boot能够正确解析这个路径？

UPDATE
看了https://stackoverflow.com/a/36372773/379235之后,我改变了我的代码

FileInputStream serviceAccount = new FileInputStream(new ClassPathResource(resourceName).getFile());

它现在没说了

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'firebaseTokenVerifier' defined in URL [jar:file:/Users/Harit.Himanshu/bl/sources/idea/myapp-core/target/myapp-core-0.0.1-SNAPSHOT.jar!/BOOT-INF/classes!/com/myapp/api/auth/FirebaseTokenVerifier.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationEx
    ception: Failed to instantiate [com.myapp.api.auth.FirebaseTokenVerifier]: Constructor threw exception; nested exception is java.io.FileNotFoundException: class path resource [staging_firebase.json] cannot be resolved to absolute file path because it does not reside in the file system: jar:file:/Users/Harit.Himanshu/bl/sources/idea/myapp-core/target/myapp-core-0.0.1-SNAPSHOT.jar!/BOO
    T-INF/classes!/staging_firebase.json
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1155) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1099) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:835) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    ... 49 common frames omitted
    Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.myapp.api.auth.FirebaseTokenVerifier]: Constructor threw exception; nested exception is java.io.FileNotFoundException: class path resource [staging_firebase.json] cannot be resolved to absolute file path because it does not reside in the file system: jar:file:/Users/Harit.Himanshu/bl/sources/idea/penn
    ytrak-core/target/myapp-core-0.0.1-SNAPSHOT.jar!/BOOT-INF/classes!/staging_firebase.json
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:154) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1147) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    ... 61 common frames omitted
    Caused by: java.io.FileNotFoundException: class path resource [staging_firebase.json] cannot be resolved to absolute file path because it does not reside in the file system: jar:file:/Users/Harit.Himanshu/bl/sources/idea/myapp-core/target/myapp-core-0.0.1-SNAPSHOT.jar!/BOOT-INF/classes!/staging_firebase.json
    at org.springframework.util.ResourceUtils.getFile(ResourceUtils.java:215) ~[spring-core-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at org.springframework.core.io.AbstractFileResolvingResource.getFile(AbstractFileResolvingResource.java:52) ~[spring-core-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    at com.myapp.api.auth.FirebaseTokenVerifier.<init>(FirebaseTokenVerifier.java:34) ~[classes!/:0.0.1-SNAPSHOT]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_131]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_131]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_131]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_131]
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:142) ~[spring-beans-4.3.8.RELEASE.jar!/:4.3.8.RELEASE]
    ... 63 common frames omitted

即使我可以在jar文件中看到它

✗ jar -tvf target/myapp-core-0.0.1-SNAPSHOT.jar| grep json
  2355 Wed Jul 26 16:54:02 NZST 2017 BOOT-INF/classes/staging_firebase.json
 64952 Tue Jan 07 19:29:24 NZDT 2014 BOOT-INF/lib/json-20140107.jar

最佳答案

cannot be resolved to absolute file path because it does not reside in the file system

这很明确.当它不是文件而是嵌入在JAR中的资源时,您尝试将其作为文件进行访问.

研究ClassLoader#getResourceAsStream().

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