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Editorial Team
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Asked: 2026-06-16T07:32:33+00:00

I am writing a basic TCP chat program and one of the requirements is

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I am writing a basic TCP chat program and one of the requirements is that it can be run from the command line with the following argument formats:

java Server 8888
java Client localhost 8888

Which will start a server listening on 8888 and which waits to accept incoming connections from clients. Then start a client and connect to the server at localhost:8888. These classes can both be compiled and run from within Eclipse and I have added the above variables to the run configurations for the classes, respectively.

If I navigate to the directory of the files in CMD I can see the compiled .class files, but when I try to run the server with:

java Server 8888

I get the error

Error: Could not find or load main class Server

Eclipse>Window>Preferences>Java>Compiler shows JDK 1.7.

Running java -version from the command line shows

java version "1.7.0_02"
Java(TM) SE Runtime Environment (build 1.7.0_02-b13)
Java HotSpot(TM) 64-Bit Server VM (build 22.0-b10, mixed mode)

I want to be able to run both the classes from separate prompts in parallel. Any ideas?

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1 Answer

  1. Editorial Team
    java -cp . basicChat.Server 8888

    You need to specify the fully qualified class name (including the package name)

    Reason:

    The class full name (known as fully qualified name) is not Server, it is basicChat.Server. The file is located under a directory named basicChat. So java is looking for a a directory structure matching the package name.
    The Server.class file is located under the basicChat directory in the file system.

    Else consider how we would have a problem to select the intended class if you had several classes called Server in different packages (name spaces).

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