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If I use
try { Class.forName("my.package.Foo"); // it exists on the classpath } catch(ClassNotFoundException e) { // it does not exist on the classpath } the static initializer block of "Foo" is kicked off. Is there a way to determine whether a class "my.package.Foo" is on the classpath without kicking off its static initializer?
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We can check for the existence of a class using Java Reflection, specifically Class. forName(). The documentation shows that a ClassNotFoundException will be thrown if the class cannot be located.
To check our CLASSPATH on Windows we can open a command prompt and type echo %CLASSPATH%. To check it on a Mac you need to open a terminal and type echo $CLASSPATH.
A pragmatic way: Class. forName("com. myclass") where com. myclass is a class that is inside (and only inside) your target jar; if that throws a ClassNotFoundException , then the jar is not on you current classpath.
Try the forName(String name, boolean initialize, ClassLoader loader) method of Class and set the param initialize to false.
JavaDoc link
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