Firebase database connection with Java Server throwing InvocationTargetException

[Paras Diwan]

I am trying to connect firebase database from Java server but it throws exception when i get reference from database

            FirebaseDatabase fireDB = FirebaseDatabase.getInstance(firebaseApp);

            System.out.println(fireDB);

            DatabaseReference ref = fireDB.getReference("/users");

            System.out.println("db counsellor ref : " + ref);

            System.out.println("db ref key : " + ref.getKey());

 in third line it throws exception

Firebase app in autowired in Spring and initialized in config class as below:

            String firebaseJson = env.getProperty("firebase.credentials");
            String fireDb = env.getProperty("firebase.db");
            System.out.println("\n\n" + firebaseJson + "\n\n");
            System.out.println("\n\n" + fireDb + "\n\n");
            FirebaseOptions options = new FirebaseOptions.Builder()
                    .setServiceAccount(new FileInputStream(firebaseJson))
                    .setDatabaseUrl(fireDb)
                    .build();
            System.out.println("firebase options" + options);
            System.out.println("Firebase connection created");
            return FirebaseApp.initializeApp(options);

The log trace :

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException

at com.google.firebase.database.core.GaePlatform.getGaeThreadFactory(GaePlatform.java:67)

at com.google.firebase.database.core.GaePlatform.isActive(GaePlatform.java:78)

at com.google.firebase.database.core.Context.getPlatform(Context.java:42)

at com.google.firebase.database.core.Context.ensureLogger(Context.java:211)

at com.google.firebase.database.core.Context.initServices(Context.java:77)

at com.google.firebase.database.core.Context.freeze(Context.java:64)

at com.google.firebase.database.core.RepoManager.createLocalRepo(RepoManager.java:78)

at com.google.firebase.database.core.RepoManager.createRepo(RepoManager.java:28)

at com.google.firebase.database.FirebaseDatabase.ensureRepo(FirebaseDatabase.java:249)

at com.google.firebase.database.FirebaseDatabase.getReference(FirebaseDatabase.java:125)

at com.hw.service.impl.AppServiceImpl.repopulateCounsellors(AppServiceImpl.java:161)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)

at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)

at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)

at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)

at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)

at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)

at com.sun.proxy.$Proxy57.repopulateCounsellors(Unknown Source)

at com.hw.controller.AppController.repopulateCounsellors(AppController.java:70)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)

at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)

at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:114)

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)

at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)

at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)

at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)

at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)

at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)

at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)

at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:745)

Caused by: java.lang.reflect.InvocationTargetException

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at com.google.firebase.database.core.GaePlatform.getGaeThreadFactory(GaePlatform.java:62)

... 60 more

Caused by: java.lang.NullPointerException

at com.google.appengine.api.ThreadManager.backgroundThreadFactory(ThreadManager.java:72)

... 65 more

Please help me out. I cant figure out where i am getting it wrong

[Kato Richardson]

Hello Paras,

Something here seems amiss, and definitely related to being “autowired in Spring.” Is fireDB and firebaseApp both logging reasonable values? I don’t see anything checking firebaseApp in your terse snippets here. I’d expect one of those to be null, based on the NPE near the bottom. Can you add a breakpoint in there and examine the vars?

☼, Kato

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kato...@google.com |

775-235-8398