NullPointerException when PostgreSQL is down after connecting

I don’t know how to reproduce 100% of the cases. But I’m trying vertx and this postgresql driver and what I’m trying to see is the behavior of the application when it’s running but for some reason loses connection to PostgreSQL.

After the application is up and running, I kill my local PostgreSQL that is running inside of docker and in some situations I get a NullPointerException coming from inside of the reactive-pg-client lib.

This is the code:

suspend fun main(args: Array<String>) {
    val vertx = Vertx.vertx()

    // Pool options
    var options = pgPoolOptionsOf(
            port = 5432,
            host = "localhost",
            database = "client_data_management",
            user = "client-service",
            password = "client-service",
            connectTimeout = 5,
            reconnectInterval = 5,
            reconnectAttempts = 10,
            maxSize = 5)

    try {
        val pgConnection = PgClient.connectAwait(vertx, options)

        val clientEntityRepository = ClientEntityRepositoryPostgreSQL(pgConnection)

        val router = Router.router(vertx)

        router.get("/").handler { httpRequest ->
            GlobalScope.launch(vertx.dispatcher()) {
                clientEntityRepository.findAll().forEach {
                    httpRequest.response().end(it.toString())
                }
            }
        }.failureHandler {
            it.failure().printStackTrace()
            it.response().end("error")
        }

        vertx.createHttpServer()
                .requestHandler(router::accept)
                .listenAwait(8080)

    } catch (e: Exception) {
        println("exception")
        vertx.close()
    }
}

java.lang.NullPointerException
	at io.reactiverse.pgclient.impl.codec.decoder.MessageDecoder.decodeError(MessageDecoder.java:253)
	at io.reactiverse.pgclient.impl.codec.decoder.MessageDecoder.decodeMessage(MessageDecoder.java:142)
	at io.reactiverse.pgclient.impl.codec.decoder.MessageDecoder.channelRead(MessageDecoder.java:122)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:644)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:579)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:496)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:458)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:834)
Exception in thread "vert.x-eventloop-thread-0" io.vertx.core.VertxException: Connection not open CLOSED
	at io.reactiverse.pgclient.impl.SocketConnection.schedule(SocketConnection.java:229)
	at io.reactiverse.pgclient.impl.PgConnectionImpl.schedule(PgConnectionImpl.java:67)
	at io.reactiverse.pgclient.impl.PgConnectionImpl.schedule(PgConnectionImpl.java:59)
	at io.reactiverse.pgclient.impl.PgClientBase.query(PgClientBase.java:48)
	at io.reactiverse.pgclient.impl.PgClientBase.query(PgClientBase.java:38)
	at io.reactiverse.pgclient.impl.PgConnectionImpl.query(PgConnectionImpl.java:26)
	at xxx.ClientEntityRepositoryPostgreSQL$findAll$result$1.invoke(ClientRepository.kt:28)
	at xxx.ClientEntityRepositoryPostgreSQL$findAll$result$1.invoke(ClientRepository.kt:11)
	at io.vertx.kotlin.coroutines.VertxCoroutineKt.awaitEvent(VertxCoroutine.kt:66)
	at io.vertx.kotlin.coroutines.VertxCoroutineKt.awaitResult(VertxCoroutine.kt:96)
	at xxx.ClientEntityRepositoryPostgreSQL.findAll(ClientRepository.kt:28)
	at xxx.AppKt$main$2$1.invokeSuspend(App.kt:42)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:238)
	at io.vertx.kotlin.coroutines.VertxCoroutineExecutor.execute(VertxCoroutine.kt:230)
	at kotlinx.coroutines.ExecutorCoroutineDispatcherBase.dispatch(Executors.kt:64)
	at kotlinx.coroutines.DispatchedKt.resumeCancellable(Dispatched.kt:413)
	at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:25)
	at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.kt:109)
	at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.kt:154)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Builders.common.kt:54)
	at kotlinx.coroutines.BuildersKt.launch(Unknown Source)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch$default(Builders.common.kt:47)
	at kotlinx.coroutines.BuildersKt.launch$default(Unknown Source)
	at xxx.AppKt$main$2.handle(App.kt:40)
	at xxx.AppKt$main$2.handle(App.kt)
	at io.vertx.ext.web.impl.RouteImpl.handleContext(RouteImpl.java:227)
	at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:121)
	at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:134)
	at io.vertx.ext.web.impl.RouterImpl.handle(RouterImpl.java:80)
	at io.vertx.ext.web.impl.RouterImpl.handle(RouterImpl.java:41)
	at io.vertx.ext.web.Router.accept(Router.java:64)
	at xxx.AppKt$main$4.invoke(App.kt:57)
	at xxx.AppKt$main$4.invoke(App.kt)
	at xxx.AppKt$sam$io_vertx_core_Handler$0.handle(App.kt)
	at io.vertx.core.http.impl.WebSocketRequestHandler.handle(WebSocketRequestHandler.java:50)
	at io.vertx.core.http.impl.WebSocketRequestHandler.handle(WebSocketRequestHandler.java:32)
	at io.vertx.core.http.impl.HttpServerRequestImpl.handleBegin(HttpServerRequestImpl.java:150)
	at io.vertx.core.http.impl.Http1xServerConnection.handleMessage(Http1xServerConnection.java:129)
	at io.vertx.core.net.impl.ConnectionBase.handleRead(ConnectionBase.java:390)
	at io.vertx.core.impl.ContextImpl.executeTask(ContextImpl.java:320)
	at io.vertx.core.impl.EventLoopContext.execute(EventLoopContext.java:43)
	at io.vertx.core.impl.ContextImpl.executeFromIO(ContextImpl.java:188)
	at io.vertx.core.net.impl.VertxHandler.channelRead(VertxHandler.java:174)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
	at io.netty.handler.codec.http.websocketx.extensions.WebSocketServerExtensionHandler.channelRead(WebSocketServerExtensionHandler.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.vertx.core.http.impl.Http1xUpgradeToH2CHandler.channelRead(Http1xUpgradeToH2CHandler.java:98)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:323)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:297)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.vertx.core.http.impl.Http1xOrH2CHandler.end(Http1xOrH2CHandler.java:61)
	at io.vertx.core.http.impl.Http1xOrH2CHandler.channelRead(Http1xOrH2CHandler.java:38)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:644)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:579)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:496)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:458)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:834)```

[Globegitter]

Will set something up.

[vietj]

thank you

On 17 Sep 2019, at 08:13, Markus Padourek [e-mail] wrote:

Will set something up.

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