How to solve the classpath problem of Java

This article mainly explains "how to solve the classpath problem of Java". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to solve the classpath problem of Java".

When running Java programs, it is often necessary to specify a directory containing various jar packages as the classpath. We used to use-Djava.ext.dirs=... To specify the jar directory.

But in the new version of JDK, which seems to start with JDK 9, you will be prompted when you still use this parameter:

C:\ Users\ Winter Lau > java-Djava.ext.dirs=lib-Djava.ext.dirs=lib is not supported. Use-classpath instead.Error: Could not create the Java Virtual Machine.Error: A fatal exception has occurred. Program will exit.

Well, it's easy for you to replace it with-classpath or-cp.

And then I'll try.

Java-cp lib xxx.xxxxjava-cp lib\ * .jar xxx.xxx

Although the result is correct, the classpath setting does not work.

After thinking about it for a long time, I can't believe I want to play like this:

Java-cp lib\ * xxx.xxxx

Note that it's lib\ * instead of lib\ *. Jar is not lib. Linux can be replaced with a forward slash.

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