Question

I have made my custom jar file and compiled it using

path C:\Program Files\Java\jdk1.7.0_04\bin;%path%
javac *.java
jar cvf QLibrary.jar *.class

Then I took that jar file and put it in the same directory where my Main.java is located

Main.java is going to use classes that are in the jar

So I have decided to put import QLibrary.*; inside Main.java

And I compile using

path C:\Program Files\Java\jdk1.7.0_04\bin;%path%
javac -cp ".;*.jar" *java

But apparently it does not recognize the library or the classes in it. What exactly am I doing wrong?

Answer 1

You should either list the names of all your jar files:

javac -cp ".;QLibrary.jar" *java

or you could use wildcards in this way:

javac -cp ".;*" *java

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.
… For example, if the directory foo contains a.jar, b.jar, and c.jar, then the class path foo/* is expanded into foo/a.jar;foo/b.jar;foo/c.jar.

http://docs.oracle.com/javase/6/docs/technotes/tools/windows/classpath.html