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Editorial Team
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Asked: 2026-05-24T22:30:40+00:00

I have a simple Java file Q.java that depends on an external library file

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I have a simple Java file Q.java that depends on an external library file X.jar. Both Q.java and X.jar are in the same directory. I can compile Q.java from the command line by doing: “javac -cp X.jar Q.java”. This generates a Q.class file. How do I run this now? I tried all these:

1) java Q
2) java -cp X.jar Q

I keep getting a
Exception in thread “main” java.lang.NoClassDefFoundError: Q
Caused by: java.lang.ClassNotFoundException: Q

So how do I run this from the command line now that I have the class file?

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1 Answer

  1. Editorial Team
    java -cp X.jar:. Q

    You have to specify in the classpath that you want to use the JAR dependency AND the current local directory to resolve classes.

    Edit suggested in the comments:

    On Windows, replace : by ;:

    java -cp X.jar;. Q
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