Question

我在OPC客户端代码中收到以下错误。我启动我的客户端 - 关闭它 - 再次启动它以查看以下错误。很明显，之前运行的东西正在引发它。但我无法弄清楚它是什么。

当我区分第一次跑步的jstack并关闭时。我没有看到来自opc的任何正在运行的线程。

有没有人见过这个问题？要么还有其他方法可以调试这个问题吗？

2016-05-19 16:35:53,564 WARN  [netty-event-loop-0] io.netty.channel.ChannelInitializer - Failed to initialize a channel. Closing: [id: 0xe25cac5b] java.lang.ExceptionInInitializerError
        at com.digitalpetri.opcua.stack.client.UaTcpStackClient$1.initChannel(UaTcpStackClient.java:340)
        at com.digitalpetri.opcua.stack.client.UaTcpStackClient$1.initChannel(UaTcpStackClient.java:337)
        at io.netty.channel.ChannelInitializer.channelRegistered(ChannelInitializer.java:69)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRegistered(AbstractChannelHandlerContext.java:133)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRegistered(AbstractChannelHandlerContext.java:119)
        at io.netty.channel.DefaultChannelPipeline.fireChannelRegistered(DefaultChannelPipeline.java:733)
        at io.netty.channel.AbstractChannel$AbstractUnsafe.register0(AbstractChannel.java:449)
        at io.netty.channel.AbstractChannel$AbstractUnsafe.access$100(AbstractChannel.java:377)
        at io.netty.channel.AbstractChannel$AbstractUnsafe$1.run(AbstractChannel.java:423)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:380)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357)
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
        at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.IllegalArgumentException: 'awaiting-handshake' is already in use
        at io.netty.util.UniqueName.<init>(UniqueName.java:53)
        at io.netty.util.AttributeKey.<init>(AttributeKey.java:47)
        at io.netty.util.AttributeKey.valueOf(AttributeKey.java:39)
        at com.digitalpetri.opcua.stack.client.handlers.UaTcpClientAcknowledgeHandler.<clinit>(UaTcpClientAcknowledgeHandler.java:44)
        ... 13 more

Answer 1

看起来你可能有某种类的ClassLoader问题 - UaTcpAcknowledgeHandler的静态最终字段被定义了两次。

当你＆＃34;关闭＆＃34;你的客户？

OPC客户端问题

1 个答案: