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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?
871
Running Jar file require you to have the jar file included in your class path. This can be done at run time using URLClassLoader . Simply construct a URLClassLoader with the jar as one of the URL. Then call its forClass(...) if you know the class name (full name of course).
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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