NPE while creating channel

Please answer these questions before submitting your issue.

What version of gRPC are you using? -> 1.20.0

Using Java 8, Tomcat V 7.0

The line in question is ->

ManagedChannel channel = NettyChannelBuilder.forAddress(getGrpcDomainName(), getGrpcPort()).sslContext(GrpcSslContexts.forClient().trustManager(certificateStream).build()).build();

What did you expect to see?

ERROR	ERROR	-	java.lang.NullPointerException	-	exc.name=java.lang.NullPointerException,exc.orig=com.google.common.base.Preconditions.checkNotNull:770
,exc.msg=java.lang.NullPointerException:null,exc.chain=53e4226a,exc.stack=java.lang.NullPointerException
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:770)
at io.grpc.NameResolver$Args$Builder.setProxyDetector(NameResolver.java:525)
at io.grpc.NameResolver$Factory.newNameResolver(NameResolver.java:184)
at io.grpc.internal.ManagedChannelImpl.getNameResolver(ManagedChannelImpl.java:632)
at io.grpc.internal.ManagedChannelImpl.<init>(ManagedChannelImpl.java:547)
at io.grpc.internal.AbstractManagedChannelImplBuilder.build(AbstractManagedChannelImplBuilder.java:440)
at com.project.new.services.read.Orchestrator.init(Orchestrator.java:60)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:344)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:295)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:130)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:396)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1507)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:293)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:290)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:191)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:636)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:934)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
at com.project.scm.client.execution.ScmServletContextListener.configureAndRefreshWebApplicationContext(ScmServletContextListener.java:87)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5118)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5634)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1260)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:2002)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)\n,applog.msg=Problem creating connection with gRPC

[ejona86]

It does not appear you are running v1.20. The line numbers for NameResolver match v1.21 (grpc-api) and those for ManagedChannelImpl match v1.18 (grpc-core).

The error is because PARAMS_PROXY_DETECTOR was not supported in v1.18 and we introduced an API in 1.21 that requires it. Even if that wasn’t the problem, skewing versions like this could cause many more problems.

Are you using Gradle? I don’t think Maven would behave this way. If you add a dependency on io.grpc:grpc-core:1.21.0 the problem should go away.

CC @zhangkun83

[ejona86]

@vaikzs, what does that have to do with this issue?