Web Call Server 5.2 - EN
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When an error occurs, an exception stack trace is logged, for example

09:55:51,203 WARN  olNegotiationHandler - nioEventLoopGroup-3-2 [id: 0x3cee8c80, L:0.0.0.0/0.0.0.0:8445 ! R:/192.168.1.179:31032] TLS handshake failed:
javax.net.ssl.SSLHandshakeException: error:100000f7:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER
	at io.netty.handler.ssl.ReferenceCountedOpenSslEngine.sslReadErrorResult(ReferenceCountedOpenSslEngine.java:1334)
	at io.netty.handler.ssl.ReferenceCountedOpenSslEngine.unwrap(ReferenceCountedOpenSslEngine.java:1295)
	at io.netty.handler.ssl.ReferenceCountedOpenSslEngine.unwrap(ReferenceCountedOpenSslEngine.java:1371)
	at io.netty.handler.ssl.ReferenceCountedOpenSslEngine.unwrap(ReferenceCountedOpenSslEngine.java:1414)
	at io.netty.handler.ssl.SslHandler$SslEngineType$1.unwrap(SslHandler.java:224)
	at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1338)
	at io.netty.handler.ssl.SslHandler.decodeNonJdkCompatible(SslHandler.java:1245)
	at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1282)
	at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507)
	at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:446)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
	at io.netty.channel.DefaultChannelPipeline$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.lang.Thread.run(Thread.java:748)

In this example, client sent a wrong data packet while establishing a secure connection to the HLS playback port.

Stack trace contains a useful information to debug theerror, but Java machine may hide it for certain exceptions such as NullPointerException . To enable stack trace logging, add the following parameter to wcs_core.properties file

-XX:-OmitStackTraceInFastThrow