websocket connect error

[kworldljd]

I set web3j.client-address=ws://localhost:8546
run the program to get the following error , but retry in command line: geth attach ws://localhost:8546,It is ok.
it need some more setting? which document can tell us ? thanks
java.lang.RuntimeException: Provided file socket cannot be opened: ws://localhost:8546

java.lang.IllegalStateException: Failed to execute ApplicationRunner
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:774) [spring-boot-2.1.7.RELEASE.jar!/:2.1.7.RELEASE]
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:761) [spring-boot-2.1.7.RELEASE.jar!/:2.1.7.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:319) [spring-boot-2.1.7.RELEASE.jar!/:2.1.7.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1214) [spring-boot-2.1.7.RELEASE.jar!/:2.1.7.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1203) [spring-boot-2.1.7.RELEASE.jar!/:2.1.7.RELEASE]
at com.ljd.UacExecutor.UacExecutorApplication.main(UacExecutorApplication.java:14) [classes!/:0.0.1-SNAPSHOT]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [uac-executor-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [uac-executor-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.Launcher.launch(Launcher.java:51) [uac-executor-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52) [uac-executor-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
Caused by: java.lang.RuntimeException: Provided file socket cannot be opened: ws://localhost:8546
at org.web3j.protocol.ipc.UnixDomainSocket.(UnixDomainSocket.java:41) ~[core-4.2.0.jar!/:na]
at org.web3j.protocol.ipc.UnixDomainSocket.(UnixDomainSocket.java:27) ~[core-4.2.0.jar!/:na]
at org.web3j.protocol.ipc.UnixIpcService.getIO(UnixIpcService.java:21) ~[core-4.2.0.jar!/:na]
at org.web3j.protocol.ipc.IpcService.performIO(IpcService.java:33) ~[core-4.2.0.jar!/:na]
at org.web3j.protocol.Service.send(Service.java:34) ~[core-4.2.0.jar!/:na]
at org.web3j.protocol.core.Request.send(Request.java:72) ~[core-4.2.0.jar!/:na]
at org.web3j.protocol.core.filters.LogFilter.sendRequest(LogFilter.java:31) ~[core-4.2.0.jar!/:na]
at org.web3j.protocol.core.filters.Filter.run(Filter.java:51) ~[core-4.2.0.jar!/:na]
at org.web3j.protocol.rx.JsonRpc2_0Rx.run(JsonRpc2_0Rx.java:73) ~[core-4.2.0.jar!/:na]
at org.web3j.protocol.rx.JsonRpc2_0Rx.lambda$ethLogFlowable$2(JsonRpc2_0Rx.java:65) ~[core-4.2.0.jar!/:na]
at io.reactivex.internal.operators.flowable.FlowableCreate.subscribeActual(FlowableCreate.java:71) ~[rxjava-2.2.11.jar!/:na]
at io.reactivex.Flowable.subscribe(Flowable.java:14918) ~[rxjava-2.2.11.jar!/:na]
at io.reactivex.internal.operators.flowable.FlowableMap.subscribeActual(FlowableMap.java:37) ~[rxjava-2.2.11.jar!/:na]
at io.reactivex.Flowable.subscribe(Flowable.java:14918) ~[rxjava-2.2.11.jar!/:na]
at io.reactivex.internal.operators.flowable.BlockingFlowableIterable.iterator(BlockingFlowableIterable.java:42) ~[rxjava-2.2.11.jar!/:na]
at com.ljd.UacExecutor.myLinster.startWatch(myLinster.java:97) ~[classes!/:0.0.1-SNAPSHOT]
at com.ljd.UacExecutor.myLinster.run(myLinster.java:39) ~[classes!/:0.0.1-SNAPSHOT]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:771) [spring-boot-2.1.7.RELEASE.jar!/:2.1.7.RELEASE]
... 13 common frames omitted
Caused by: java.io.IOException: No such file or directory
at jnr.unixsocket.UnixSocketChannel.doConnect(UnixSocketChannel.java:127) ~[jnr-unixsocket-0.21.jar!/:na]
at jnr.unixsocket.UnixSocketChannel.connect(UnixSocketChannel.java:136) ~[jnr-unixsocket-0.21.jar!/:na]
at jnr.unixsocket.UnixSocketChannel.open(UnixSocketChannel.java:68) ~[jnr-unixsocket-0.21.jar!/:na]
at org.web3j.protocol.ipc.UnixDomainSocket.(UnixDomainSocket.java:35) ~[core-4.2.0.jar!/:na]
... 30 common frames omitted