error while creating an application java core(GCI 2019)

[pranayjoshi]

While creating an application when I am importing java core and just creating a new instance it is showing some Illegal access warning
Actual Error:-

15:46:59.557 [main] DEBUG i.n.u.i.l.InternalLoggerFactory - Using SLF4J as the default logging framework
15:46:59.578 [main] DEBUG io.netty.util.ResourceLeakDetector - -Dio.netty.leakDetection.level: simple
15:46:59.580 [main] DEBUG io.netty.util.ResourceLeakDetector - -Dio.netty.leakDetection.maxRecords: 4
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by io.netty.util.internal.PlatformDependent0 (file:/C:/Users/prana/Downloads/java-core-0.1.jar) to field java.nio.Buffer.address
WARNING: Please consider reporting this to the maintainers of io.netty.util.internal.PlatformDependent0
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
15:46:59.597 [main] DEBUG i.n.util.internal.PlatformDependent0 - java.nio.Buffer.address: unavailable
15:46:59.597 [main] DEBUG i.n.util.internal.PlatformDependent0 - java.nio.DirectByteBuffer.<init>(long, int): unavailable
15:46:59.598 [main] DEBUG i.n.util.internal.PlatformDependent - Platform: Windows
15:46:59.598 [main] DEBUG i.n.util.internal.PlatformDependent - Java version: 8
15:46:59.598 [main] DEBUG i.n.util.internal.PlatformDependent - -Dio.netty.noUnsafe: false
15:46:59.598 [main] DEBUG i.n.util.internal.PlatformDependent - sun.misc.Unsafe: unavailable
15:46:59.651 [main] DEBUG i.n.util.internal.PlatformDependent - maxDirectMemory: 2101346304 bytes (maybe)
15:46:59.651 [main] DEBUG i.n.util.internal.PlatformDependent - -Dio.netty.noJavassist: false
15:46:59.778 [main] DEBUG i.n.util.internal.PlatformDependent - Javassist: available
15:46:59.779 [main] DEBUG i.n.util.internal.PlatformDependent - -Dio.netty.tmpdir: C:\Users\prana\AppData\Local\Temp (java.io.tmpdir)
15:46:59.779 [main] DEBUG i.n.util.internal.PlatformDependent - -Dio.netty.bitMode: 64 (sun.arch.data.model)
15:46:59.779 [main] DEBUG i.n.util.internal.PlatformDependent - -Dio.netty.noPreferDirect: true
15:46:59.779 [main] INFO  i.n.util.internal.PlatformDependent - Your platform does not provide complete low-level API for accessing direct buffers reliably. Unless explicitly requested, heap buffer will always be preferred to avoid potential system unstability.
15:46:59.781 [main] DEBUG i.n.util.internal.PlatformDependent - io.netty.maxDirectMemory: -1 bytes
15:47:00.560 [main] DEBUG io.netty.handler.ssl.JdkSslContext - Default protocols (JDK): [TLSv1.2, TLSv1.1, TLSv1] 
15:47:00.560 [main] DEBUG io.netty.handler.ssl.JdkSslContext - Default cipher suites (JDK): [TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, TLS_RSA_WITH_AES_128_GCM_SHA256, TLS_RSA_WITH_AES_128_CBC_SHA, TLS_RSA_WITH_AES_256_CBC_SHA]
15:47:00.590 [main] DEBUG i.n.c.MultithreadEventLoopGroup - -Dio.netty.eventLoopThreads: 8
15:47:00.602 [main] DEBUG io.netty.channel.nio.NioEventLoop - -Dio.netty.noKeySetOptimization: false
15:47:00.602 [main] DEBUG io.netty.channel.nio.NioEventLoop - -Dio.netty.selectorAutoRebuildThreshold: 512
15:47:00.655 [main] DEBUG i.n.buffer.PooledByteBufAllocator - -Dio.netty.allocator.numHeapArenas: 8
15:47:00.656 [main] DEBUG i.n.buffer.PooledByteBufAllocator - -Dio.netty.allocator.numDirectArenas: 8
15:47:00.656 [main] DEBUG i.n.buffer.PooledByteBufAllocator - -Dio.netty.allocator.pageSize: 8192
15:47:00.656 [main] DEBUG i.n.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxOrder: 11
15:47:00.656 [main] DEBUG i.n.buffer.PooledByteBufAllocator - -Dio.netty.allocator.chunkSize: 16777216
15:47:00.656 [main] DEBUG i.n.buffer.PooledByteBufAllocator - -Dio.netty.allocator.tinyCacheSize: 512
15:47:00.656 [main] DEBUG i.n.buffer.PooledByteBufAllocator - -Dio.netty.allocator.smallCacheSize: 256
15:47:00.656 [main] DEBUG i.n.buffer.PooledByteBufAllocator - -Dio.netty.allocator.normalCacheSize: 64
15:47:00.656 [main] DEBUG i.n.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxCachedBufferCapacity: 32768
15:47:00.656 [main] DEBUG i.n.buffer.PooledByteBufAllocator - -Dio.netty.allocator.cacheTrimInterval: 8192
15:47:00.755 [main] DEBUG io.netty.buffer.AbstractByteBuf - -Dio.netty.buffer.bytebuf.checkAccessible: true
15:47:00.796 [main] DEBUG i.n.util.internal.ThreadLocalRandom - -Dio.netty.initialSeedUniquifier: 0x85bbec470791b268 (took 0 ms)
15:47:00.836 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.allocator.type: unpooled
15:47:00.836 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.threadLocalDirectBufferSize: 65536
15:47:00.836 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.maxThreadLocalCharBufferSize: 16384
15:47:00.873 [AsyncHttpClient-2-1] DEBUG i.n.u.i.JavassistTypeParameterMatcherGenerator - Generated: io.netty.util.internal.__matchers__.io.netty.handler.codec.http.HttpObjectMatcher
15:47:01.147 [AsyncHttpClient-2-1] DEBUG o.a.n.channel.NettyConnectListener - Using new Channel '[id: 0xa93c4e75, L:/192.168.43.164:57537 - R:istsos.org/195.176.186.100:80]' for 'GET' to '/istsos/wa/istsos/services'
15:47:01.156 [AsyncHttpClient-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.maxCapacity.default: 262144
15:47:01.156 [AsyncHttpClient-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.linkCapacity: 16
15:47:01.763 [AsyncHttpClient-2-1] DEBUG o.a.netty.handler.HttpHandler - 

Request DefaultFullHttpRequest(decodeResult: success, version: HTTP/1.1, content: UnpooledHeapByteBuf(freed))
GET /istsos/wa/istsos/services HTTP/1.1
Host: istsos.org
Accept: */*
User-Agent: AHC/2.0

Response DefaultHttpResponse(decodeResult: success, version: HTTP/1.1)
HTTP/1.1 200 OK
Date: Wed, 22 Jan 2020 10:17:01 GMT
Server: Apache/2.4.7 (Ubuntu)
Content-Length: 1702
Content-Type: application/json; charset=utf-8
Via: 1.1 www.istsos.org
Access-Control-Allow-Origin: *
Accept-Ranges: bytes
Access-Control-Allow-Methods: GET
Vary: Accept-Encoding

15:47:01.771 [AsyncHttpClient-2-1] DEBUG o.a.netty.channel.ChannelManager - Adding key: http://istsos.org:80 for channel [id: 0xa93c4e75, L:/192.168.43.164:57537 - R:istsos.org/195.176.186.100:80]
15:47:01.784 [AsyncHttpClient-2-1] DEBUG o.a.netty.handler.HttpHandler - null
java.lang.NullPointerException: null
	at org.asynchttpclient.netty.NettyResponseFuture.done(NettyResponseFuture.java:228) ~[java-core-0.1.jar:0.1]
	at org.asynchttpclient.netty.handler.HttpHandler.finishUpdate(HttpHandler.java:58) ~[java-core-0.1.jar:0.1]
	at org.asynchttpclient.netty.handler.HttpHandler.handleChunk(HttpHandler.java:159) ~[java-core-0.1.jar:0.1]
	at org.asynchttpclient.netty.handler.HttpHandler.handleRead(HttpHandler.java:189) ~[java-core-0.1.jar:0.1]
	at org.asynchttpclient.netty.handler.AsyncHttpClientHandler.channelRead(AsyncHttpClientHandler.java:82) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:342) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:328) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:321) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:342) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:328) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:321) ~[java-core-0.1.jar:0.1]
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:342) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:328) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:321) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:428) ~[java-core-0.1.jar:0.1]
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:293) ~[java-core-0.1.jar:0.1]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:267) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:243) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:342) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:328) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:321) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1280) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:342) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:328) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:890) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:564) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:505) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:419) ~[java-core-0.1.jar:0.1]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:391) ~[java-core-0.1.jar:0.1]
	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112) ~[java-core-0.1.jar:0.1]
	at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:145) ~[java-core-0.1.jar:0.1]
	at java.base/java.lang.Thread.run(Thread.java:835) ~[na:na]
15:47:19.237 [AsyncHttpClient-2-1] DEBUG o.a.netty.handler.HttpHandler - Channel Closed: [id: 0xa93c4e75, L:/192.168.43.164:57537 ! R:istsos.org/195.176.186.100:80] with attribute INSTANCE

19:45:16.312 [pool-1-thread-1] DEBUG o.a.netty.channel.DefaultChannelPool - Closed 0 connections out of 0 in 0ms
19:46:16.414 [pool-1-thread-1] DEBUG o.a.netty.channel.DefaultChannelPool - Entry count for : http://istsos.org:80 : 0