How to use a wildcard in the classpath to add multiple jars

Question

I have been using so many 3rd party libraries jar files  that my CLASSPATH is completely messed up as i have to include the path for every single jar file that i use   I ve been wondering if there is a way to include all the jar files in a folder using wildcard    operator  like   jar   But it seems to be not working  Is there any other way that can shorten the CLASSPATH that currently looks like an essay    on my PC

User · Answer

If you mean that you have an environment variable named CLASSPATH, I'd say that's your mistake. I don't have such a thing on any machine with which I develop Java. CLASSPATH is so tied to a particular project that it's impossible to have a single, correct CLASSPATH that works for all.

I set CLASSPATH for each project using either an IDE or Ant. I do a lot of web development, so each WAR and EAR uses their own CLASSPATH.

It's ignored by IDEs and app servers. Why do you have it? I'd recommend deleting it.

User · Answer

From  http   java sun com javase 6 docs technotes tools windows classpath html     Class path entries can contain the basename wildcard character    which is considered equivalent to specifying a list of all the files in the directory with the extension  jar or  JAR  For example  the class path entry foo   specifies all JAR files in the directory named foo  A classpath entry consisting simply of   expands to a list of all the jar files in the current directory    This should work in Java6  not sure about Java5    If it seems it does not work as expected  try putting quotes  eg   foo

User · Answer

Basename wild cards were introduced in Java 6  i e   foo    means all   jar  files in the  foo  directory   In earlier versions of Java that do not support wildcard classpaths  I have resorted to using a shell wrapper script to assemble a Classpath by  globbing  a pattern and mangling the results to insert     characters at the appropriate points   This would be hard to do in a BAT file

User · Answer

This works on Windows   java -cp  lib     MAINCLASS    where  MAINCLASS  of course is the class containing your main method   Alternatively   java -cp  lib    -jar  MAINJAR    where  MAINJAR  is the jar file to launch via its internal manifest

[java] How to use a wildcard in the classpath to add multiple jars?

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