cloudfoundry / cloudfoundry/cf-java-client

NPE on DefaultApplications.getEnvironments

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Java
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Description

Hi,

I got a NullPointerException when using DefaultApplications.getEnvironments:

Exception in thread "main" java.lang.NullPointerException
	at org.cloudfoundry.operations.applications.ApplicationEnvironments$Builder.putAllUserProvided(ApplicationEnvironments.java:346)
	Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Assembly trace from producer [reactor.core.publisher.MonoMapFuseable] :
	reactor.core.publisher.Mono.checkpoint(Mono.java:1902)
	org.cloudfoundry.operations.applications.DefaultApplications.getEnvironments(DefaultApplications.java:300)
Error has been observed at the following site(s):
	|_ Mono.checkpoint ⇢ at org.cloudfoundry.operations.applications.DefaultApplications.getEnvironments(DefaultApplications.java:300)
Stack trace:
		at org.cloudfoundry.operations.applications.ApplicationEnvironments$Builder.putAllUserProvided(ApplicationEnvironments.java:346)
		at org.cloudfoundry.operations.applications.ApplicationEnvironments$Builder.userProvided(ApplicationEnvironments.java:337)
		at org.cloudfoundry.operations.applications.DefaultApplications.toApplicationEnvironments(DefaultApplications.java:1763)
		at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:113)
		at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1789)
		at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:249)
		at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1789)
		at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:249)
		at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1789)
		at reactor.core.publisher.MonoSingle$SingleSubscriber.onComplete(MonoSingle.java:185)
		at reactor.core.publisher.FluxFlatMap$FlatMapMain.checkTerminated(FluxFlatMap.java:845)
		at reactor.core.publisher.FluxFlatMap$FlatMapMain.drainLoop(FluxFlatMap.java:607)
		at reactor.core.publisher.FluxFlatMap$FlatMapMain.innerComplete(FluxFlatMap.java:916)
		at reactor.core.publisher.FluxFlatMap$FlatMapInner.onComplete(FluxFlatMap.java:1020)
		at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:142)
		at reactor.core.publisher.FluxHandle$HandleSubscriber.onComplete(FluxHandle.java:212)
		at reactor.core.publisher.FluxMap$MapConditionalSubscriber.onComplete(FluxMap.java:269)
		at reactor.core.publisher.FluxDoFinally$DoFinallySubscriber.onComplete(FluxDoFinally.java:145)
		at reactor.core.publisher.FluxHandleFuseable$HandleFuseableSubscriber.onComplete(FluxHandleFuseable.java:229)
		at reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.onComplete(FluxContextWrite.java:126)
		at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1790)
		at reactor.core.publisher.MonoCollectList$MonoCollectListSubscriber.onComplete(MonoCollectList.java:128)
		at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:259)
		at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:142)
		at reactor.core.publisher.FluxDoFinally$DoFinallySubscriber.onComplete(FluxDoFinally.java:145)
		at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:142)
		at reactor.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:389)
		at reactor.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:396)
		at reactor.netty.channel.ChannelOperations.terminate(ChannelOperations.java:452)
		at reactor.netty.http.client.HttpClientOperations.onInboundNext(HttpClientOperations.java:664)
		at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:94)
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
		at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
		at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
		at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
		at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436)
		at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324)
		at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296)
		at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251)
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
		at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
		at io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:271)
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
		at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
		at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1533)
		at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1282)
		at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1329)
		at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:508)
		at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:447)
		at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
		at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
		at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
		at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
		at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
		at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
		at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
		at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
		at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
		at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
		at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
		at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
		at java.base/java.lang.Thread.run(Thread.java:834)

It seems to happen on an application without user provided environment variables.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start in ApplicationEnvironments.java at Builder.putAllUserProvided and userProvided, then trace the conversion from DefaultApplications.toApplicationEnvironments and getEnvironments at the reported lines. Reproduce the case with an application that has no user-provided environment variables; done means getEnvironments completes without a NullPointerException.

Written by the indexing model from the issue text.

Assessment

Tech stack
java
Domain
backend
Issue type
Bug
Difficulty
2/5
Estimated time
1-3 hours
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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