首页PS G:\Java练习> & 'G:\jdk\bin\java.exe' '-XX:+ShowCodeDetailsInExceptionMessages' '-cp' 'G:\Java练习\bin' 'Server' Failed to start server: Address already in use: bind Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.net.ServerSocket.accept()" because "this.serverSocket" is null at Server.start(Server.java:47) at Server.main(Server.java:260)

PS G:\Java练习> & 'G:\jdk\bin\java.exe' '-XX:+ShowCodeDetailsInExceptionMessages' '-cp' 'G:\Java练习\bin' 'Server' Failed to start server: Address already in use: bind Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.net.ServerSocket.accept()" because "this.serverSocket" is null at Server.start(Server.java:47) at Server.main(Server.java:260)

时间: 2024-04-23 19:24:00 浏览: 141

Exception in thread "main" java.lang.NullPointerException

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这个错误的意思是服务器绑定的地址已经被占用了，所以无法启动服务器。同时，在服务器启动过程中，由于某些原因，`serverSocket`对象为空，导致在调用`accept()`方法时发生了空指针异常。你需要检查一下是否有其他程序已经占用了该地址，或者是否在代码中正确地初始化了`serverSocket`对象。

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