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Editorial Team
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Asked: 2026-05-23T10:51:24+00:00

I am trying to figure out whether it is possible to run a java

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I am trying to figure out whether it is possible to run a java class that is located on a mapped network drive. An example would be: 

C:\temp\groovy>java p:\Test
Exception in thread "main" java.lang.NoClassDefFoundError: p:\Test
Caused by: java.lang.ClassNotFoundException: p:\Test
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: p:\Test.  Program will exit.

Before trying this, I wanted to see whether I could run a java class file that is on UNC share (java \\somehost\share\Test). This did not work either – same error about class def not being found.

Am I doing something wrong or is this really not supported ?

Thanks

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1 Answer

  1. Editorial Team

    When you give a path as part of the class name, Java expects it to be in a package corresponding to the folder hierarchy it’s in.

    Example:

    > java z:/Test
java.lang.NoClassDefFoundError: z:/Test
Caused by: java.lang.ClassNotFoundException: z:.Test

    Here it is looking for “z:.Test” as the fully qualified class name.

    Assuming your Test class is not declared as being in any package, you need to specify the directory on the classpath:

    java -cp Z:\path Test
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