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From: =?utf-8?Q?Konstantin_Prei=C3=9Fer?= <verlag.preisser@t-online.de>
To: "'Tomcat Users List'" <users@tomcat.apache.org>
Subject: [OT] Querstion about Class.forName() re. ClassLoaders
Date: Fri, 10 May 2013 18:41:04 +0200
Message-ID: <000001ce4d9d$29a92c00$7cfb8400$@t-online.de>
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Hi all,

I apologize for being completely off-topic (this question has nothing to =
do with Tomcat), but I thought there may be some guys here that are =
experts in class loading and are able to answer my question.


You probably know the method java.lang.Class.forName(String name) which =
returns a class object from the given name. The JavaDoc (Java 7) of this =
method says:

      Returns the Class object associated with the class or interface =
with the given string name. Invoking this method is equivalent to:
          Class.forName(className, true, currentLoader)=20
      where currentLoader denotes the defining class loader of the =
current class.

While this description may be a bit ambiguous about what "current class" =
means here, the JavaDoc of Class.forName(String name, boolean =
initialize, ClassLoader loader) makes it clearer by stating:

      For example, in an instance method the expression:
          Class.forName("Foo")=20
      is equivalent to:
          Class.forName("Foo", true, this.getClass().getClassLoader())


So, shouldn't this mean that I get the same result/behavior when writing =
this code:

    public void doSomething() throws ClassNotFoundException {
        Class<?> clazz =3D Class.forName("foo.Bar");
        // do something...
    }

Instead of this one:

    public void doSomething() throws ClassNotFoundException {
        Class<?> clazz =3D Class.forName("foo.Bar", true, =
this.getClass().getClassLoader());
        // do something...
    }

or did I misunderstand something?

Thanks!


Regards,
Konstantin Prei=C3=9Fer


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