DISCONNECTED:WILL-RETRY on the Android Client

**syg5201314** · May 28th, 2018, 10:31 AM

HI,I've got a problem on the android platform.

<dependencies>
<dependency>
<groupId>com.lightstreamer</groupId>
<artifactId>ls-javase-client</artifactId>
<version>3.0.0-b1</version>
</dependency>
</dependencies>LightstreamerClient client = new LightstreamerClient("HOST", "AdapterSet");
client.connectionDetails.setUser("");
client.connectionDetails.setPassword("");
client.addListener(clientListener);
client.connect();

log info===

Start listening to client events
Client property changed: sessionId
Client property changed: serverSocketName
Client property changed: serverInstanceAddress
LSLightstreamer CONNECTING
DISCONNECTED:WILL-RETRY
Client property changed: sessionId
Client property changed: serverSocketName
Client property changed: serverInstanceAddress
LSLightstreamer CONNECTING
DISCONNECTED:WILL-RETRY
Client property changed: sessionId
Client property changed: serverSocketName
Client property changed: serverInstanceAddress
LSLightstreamer CONNECTING
====
I need your help

**Alessandro Carioni** · May 29th, 2018, 09:29 AM

Hi,

Which Lightstreamer server and Android platform versions are you using?

Further attach a copy of the server log and of the client log.

The client logger is enabled putting the following statements in the initialization of you app:

SystemOutLogProvider prov = new SystemOutLogProvider();
LightstreamerClient.setLoggerProvider(prov);

You must also include in the classpath the libraries 'com.lightstreamer:ls-log-adapter-java:1.0.1' and 'com.lightstreamer:java-system-out-log:1.0.2' available on our Maven repository.

Please consider also the option of using a more recent version of the client. The last released is 4.0.9 and requires server 7.0.

**syg5201314** · May 30th, 2018, 03:40 AM

thanks you for your reply.
Lightstreamer server : 6.0
Android platform versions:6.0
in accordance with you ,The logs are more detailed than before.

log info===

30.May.18 09:30:53,664|INFO |lightstreamer.actions|main|User value changed to 1#D122886140030.May.18 09:30:53,665|INFO |lightstreamer.actions|main|Password value changed
30.May.18 09:30:53,666|INFO |lightstreamer.actions|main|Connect requested
Start listening to client events
30.May.18 09:30:53,670|DEBUG|lightstreamer.session|Session Thread <1>|Opening a new session and starting automatic reconnections
30.May.18 09:30:53,672|DEBUG|lightstreamer.session|Session Thread <1>|SessionManager state change: OFF -> STREAMING_WS
Client property changed: sessionId
30.May.18 09:30:53,710|INFO |lightstreamer.actions|Session Thread <1>|Session ID value changed to null
Client property changed: serverSocketName
30.May.18 09:30:53,710|INFO |lightstreamer.actions|Session Thread <1>|Server Socket Name value changed to null
Client property changed: clientIp
30.May.18 09:30:53,710|INFO |lightstreamer.actions|Session Thread <1>|Client IP value changed to null
Client property changed: serverInstanceAddress
30.May.18 09:30:53,710|INFO |lightstreamer.actions|Session Thread <1>|Server Instance Address value changed to null
Client property changed: realMaxBandwidth
30.May.18 09:30:53,710|INFO |lightstreamer.session|Session Thread <1>|Opening new session
30.May.18 09:30:53,713|INFO |lightstreamer.protocol|Session Thread <1>|Sending create_session request
30.May.18 09:30:53,714|DEBUG|lightstreamer.protocol|Session Thread <1>|create_session parameters: LS_polling=true&LS_cause=new.api&LS_polling_millis =0&LS_idle_millis=0&LS_cid=pcYgxptg4pkpW39AK3M4hwL ri8L6U9m&LS_adapter_set=TradingPlatformAdapterSet& LS_user=1%23D1228861400&LS_password=xsOLWp4kjUa1bV b9NTcx4XwvVy2lIskJv0O5iRJXY80&
30.May.18 09:30:53,714|DEBUG|lightstreamer.stream|Session Thread <1>|HTTP transport sending: create_session LS_polling=true&LS_cause=new.api&LS_polling_millis =0&LS_idle_millis=0&LS_cid=pcYgxptg4pkpW39AK3M4hwL ri8L6U9m&LS_adapter_set=TradingPlatformAdapterSet& LS_user=1%23D1228861400&LS_password=xsOLWp4kjUa1bV b9NTcx4XwvVy2lIskJv0O5iRJXY80&
30.May.18 09:30:53,715|DEBUG|lightstreamer.stream|Session Thread <1>|Created HttpListener[] 1
30.May.18 09:30:53,844|DEBUG|lightstreamer.stream|Session Thread <1>|Request header: Host = pushuat009.sfs-uat.com
30.May.18 09:30:53,844|DEBUG|lightstreamer.stream|Session Thread <1>|Request header: user-agent = javase_client 4.0.0 build 1282
30.May.18 09:30:53,844|DEBUG|lightstreamer.stream|Session Thread <1>|Request header: content-type = application/x-www-form-urlencoded
30.May.18 09:30:53,844|DEBUG|lightstreamer.stream|Session Thread <1>|Request header: content-length = 232
30.May.18 09:30:53,851|DEBUG|lightstreamer.netty.pool|Sessio n Thread <1>|Getting a new channel
30.May.18 09:30:53,851|DEBUG|lightstreamer.netty.pool|Sessio n Thread <1>|Creating new ChannePoolWrapper
30.May.18 09:30:53,915|DEBUG|lightstreamer.netty.pool|Sessio n Thread <1>|ChannelPoolWrapper[1] created and initialized
30.May.18 09:30:53,916|DEBUG|lightstreamer.netty.pool|Sessio n Thread <1>|New pool created. Remote address: pushuat009.sfs-uat.com/178.33.0.247:444
30.May.18 09:30:54,114|DEBUG|lightstreamer.session|Session Thread <1>|Session state change: OFF -> CREATING
30.May.18 09:30:54,115|DEBUG|lightstreamer.session|Session Thread <1>|Status timeout in 4000
LSLightstreamer START CONNECT
30.May.18 09:30:54,115|DEBUG|lightstreamer.session|Session Thread <1>|WebSocket early opening
30.May.18 09:30:54,116|DEBUG|lightstreamer.stream|Session Thread <1>|WebSocket transport: NOT_CONNECTED
30.May.18 09:30:54,118|DEBUG|lightstreamer.stream|Session Thread <1>|WebSocket connecting [295acc9a]
30.May.18 09:30:54,397|DEBUG|lightstreamer.stream|Session Thread <1>|WebSocket transport: CONNECTING
30.May.18 09:30:54,423|DEBUG|lightstreamer.netty.pool|Netty HTTP Thread 1|Channel created [id: 0xe06a6cad]
30.May.18 09:30:54,790|DEBUG|lightstreamer.stream|Netty HTTP Thread 2|Writing data
30.May.18 09:30:54,808|INFO |lightstreamer.stream|Netty HTTP Thread 1|Connection opened
30.May.18 09:30:55,119|ERROR|lightstreamer.stream|Netty HTTP Thread 1|HTTP transport error
io.netty.handler.codec.DecoderException: javax.net.ssl.SSLHandshakeException: General SSLEngine problem
at io.netty.handler.codec.ByteToMessageDecoder.callDe code(ByteToMessageDecoder.java:442)
at io.netty.handler.codec.ByteToMessageDecoder.channe lRead(ByteToMessageDecoder.java:248)
at io.netty.channel.AbstractChannelHandlerContext.inv okeChannelRead(AbstractChannelHandlerContext.java: 373)
at io.netty.channel.AbstractChannelHandlerContext.inv okeChannelRead(AbstractChannelHandlerContext.java: 359)
at io.netty.channel.AbstractChannelHandlerContext.fir eChannelRead(AbstractChannelHandlerContext.java:35 1)
at io.netty.channel.DefaultChannelPipeline$HeadContex t.channelRead(DefaultChannelPipeline.java:1334)
at io.netty.channel.AbstractChannelHandlerContext.inv okeChannelRead(AbstractChannelHandlerContext.java: 373)
at io.netty.channel.AbstractChannelHandlerContext.inv okeChannelRead(AbstractChannelHandlerContext.java: 359)
at io.netty.channel.DefaultChannelPipeline.fireChanne lRead(DefaultChannelPipeline.java:926)
at io.netty.channel.nio.AbstractNioByteChannel$NioByt eUnsafe.read(AbstractNioByteChannel.java:129)
at io.netty.channel.nio.NioEventLoop.processSelectedK ey(NioEventLoop.java:651)
at io.netty.channel.nio.NioEventLoop.processSelectedK eysOptimized(NioEventLoop.java:574)
at io.netty.channel.nio.NioEventLoop.processSelectedK eys(NioEventLoop.java:488)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop .java:450)
at io.netty.util.concurrent.SingleThreadEventExecutor $5.run(SingleThreadEventExecutor.java:873)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.net.ssl.SSLHandshakeException: General SSLEngine problem
at sun.security.ssl.Handshaker.checkThrown(Handshaker .java:1431)
at sun.security.ssl.SSLEngineImpl.checkTaskThrown(SSL EngineImpl.java:535)
at sun.security.ssl.SSLEngineImpl.readNetRecord(SSLEn gineImpl.java:813)
at sun.security.ssl.SSLEngineImpl.unwrap(SSLEngineImp l.java:781)
at javax.net.ssl.SSLEngine.unwrap(SSLEngine.java:624)
at io.netty.handler.ssl.SslHandler.unwrap(SslHandler. java:1097)
at io.netty.handler.ssl.SslHandler.unwrap(SslHandler. java:968)
at io.netty.handler.ssl.SslHandler.decode(SslHandler. java:902)
at io.netty.handler.codec.ByteToMessageDecoder.callDe code(ByteToMessageDecoder.java:411)
... 15 more
Caused by: javax.net.ssl.SSLHandshakeException: General SSLEngine problem
at sun.security.ssl.Alerts.getSSLException(Alerts.jav a:192)
at sun.security.ssl.SSLEngineImpl.fatal(SSLEngineImpl .java:1728)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.jav a:304)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.jav a:296)
at sun.security.ssl.ClientHandshaker.serverCertificat e(ClientHandshaker.java:1509)
at sun.security.ssl.ClientHandshaker.processMessage(C lientHandshaker.java:216)
at sun.security.ssl.Handshaker.processLoop(Handshaker .java:979)
at sun.security.ssl.Handshaker$1.run(Handshaker.java: 919)
at sun.security.ssl.Handshaker$1.run(Handshaker.java: 916)
at java.security.AccessController.doPrivileged(Native Method)
at sun.security.ssl.Handshaker$DelegatedTask.run(Hand shaker.java:1369)
at io.netty.handler.ssl.SslHandler.runDelegatedTasks( SslHandler.java:1123)
at io.netty.handler.ssl.SslHandler.unwrap(SslHandler. java:1008)
... 17 more
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderE xception: unable to find valid certification path to requested target
at sun.security.validator.PKIXValidator.doBuild(PKIXV alidator.java:387)
at sun.security.validator.PKIXValidator.engineValidat e(PKIXValidator.java:292)
at sun.security.validator.Validator.validate(Validato r.java:260)
at sun.security.ssl.X509TrustManagerImpl.validate(X50 9TrustManagerImpl.java:324)
at sun.security.ssl.X509TrustManagerImpl.checkTrusted (X509TrustManagerImpl.java:281)
at sun.security.ssl.X509TrustManagerImpl.checkServerT rusted(X509TrustManagerImpl.java:136)
at sun.security.ssl.ClientHandshaker.serverCertificat e(ClientHandshaker.java:1496)
... 25 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderE xception: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder. build(SunCertPathBuilder.java:146)
at sun.security.provider.certpath.SunCertPathBuilder. engineBuild(SunCertPathBuilder.java:131)
at java.security.cert.CertPathBuilder.build(CertPathB uilder.java:280)
at sun.security.validator.PKIXValidator.doBuild(PKIXV alidator.java:382)
... 31 more
30.May.18 09:30:55,122|ERROR|lightstreamer.session|Session Thread <1>|Error event while CREATING

**syg5201314** · May 30th, 2018, 04:09 AM

Is this a certificate problem? Where can I get the certificate? How do I import it into LightStreamer? Why is there no problem with IOS with the same code?

**syg5201314** · May 30th, 2018, 07:51 AM

Any help would be greatly appreciated.
Thanks in advance.

**Alessandro Carioni** · May 30th, 2018, 09:23 AM

Hi,

The client cannot connect because you are using a Java SE client. You should instead use a version specific to Android.
According to the server version, you have two possibilities:

1) If your server version is 6.0.0 or lower you must use the client library included in the server distribution in the folder DOCS-SDKs/sdk_client_android or download it from this link.

2) If your server is 6.0.1 or above, you can get the library from our public Maven repository. For example to download the last version, your pom.xml should specify the following dependency:
<dependency>
<groupId>com.lightstreamer</groupId>
<artifactId>ls-android-client</artifactId>
<version>4.0.9</version>
</dependency>
Further always check you are using the last client version compatible with your server looking at the changelog.

**syg5201314** · May 30th, 2018, 11:02 AM

hi , i use android client , print log.

Log info ======

I/System.out: /lightstreamer/create_session.txt?LS_protocol=TLCP-2.1.0
LS_polling=true&LS_cause=new.api&LS_polling_millis =0&LS_idle_millis=0&LS_cid=gpGxttxdysogQz2FJ4LG3dX oqoH5Q9u&LS_adapter_set=TradingPlatformAdapterSet& LS_user=1#SHANYUGANG&LS_password=GBare-yp20OpmkhcFVTg_70iAl7edxkbqRVhc9zmIzY&
I/System.out: 30.5月.18 16:59:20,112|DEBUG|lightstreamer.stream|Netty Thread 3|HTTP transport sending [cd1a47e3]: /lightstreamer/create_session.txt?LS_protocol=TLCP-2.1.0
LS_polling=true&LS_cause=new.api&LS_polling_millis =0&LS_idle_millis=0&LS_cid=gpGxttxdysogQz2FJ4LG3dX oqoH5Q9u&LS_adapter_set=TradingPlatformAdapterSet& LS_user=1#SHANYUGANG&LS_password=GBare-yp20OpmkhcFVTg_70iAl7edxkbqRVhc9zmIzY&
I/System.out: 30.5月.18 16:59:20,114|DEBUG|lightstreamer.netty.pool|Netty Thread 1|HTTP channel active [cd1a47e3]
I/System.out: 30.5月.18 16:59:20,120|DEBUG|lightstreamer.netty.pool|Netty Thread 4|ChannelUpgradeFuture state change [4d283dd1]: CONNECTING -> CONNECTION_OK
I/System.out: 30.5月.18 16:59:20,122|DEBUG|lightstreamer.netty.pool|Netty Thread 2|HTTP channel active [4d283dd1]
I/System.out: 30.5月.18 16:59:20,127|DEBUG|lightstreamer.netty.pool|Netty Thread 2|WS channel handshake [4d283dd1]
I/System.out: 30.5月.18 16:59:21,083|DEBUG|lightstreamer.stream|Netty Thread 1|Response status: 200
I/System.out: 30.5月.18 16:59:21,084|DEBUG|lightstreamer.stream|Netty Thread 1|HTTP transport receiving [cd1a47e3]:
CONERR,65,Unsupported protocol version: TLCP-2.1.0

what protocol is TLCP-2.1.0 , please?

**syg5201314** · May 30th, 2018, 11:08 AM

**syg5201314** · May 30th, 2018, 11:09 AM

**Alessandro Carioni** · May 30th, 2018, 03:04 PM

Hi,

You are using a client version not supported by your server.
Please, check the changelog (https://www.lightstreamer.com/repo/m...CHANGELOG.HTML) and make sure that the client you choose has the statement “Compatible with Lightstreamer Server since XXX” where XXX is equal to or lower than you server version.

The exact server version is printed to the console during the startup. You should search a string like “Lightstreamer Server 7.0.0 build 1860”.

On on the Demos page of our site (https://demos.lightstreamer.com/) you can find examples of Android application. For instance see this demo (https://github.com/Lightstreamer/Lig...client-android) for a step by step tutorial.

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