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Why Class.forName("Test").getClassLoader()?


Why Class.forName("Test").getClassLoader()?

By : Karthik
Date : November 14 2020, 04:48 PM
I wish did fix the issue. why do getClassLoader() needs to be called using Class object ?? why can't I simply call getClassLoader() using the object of any class present in that package ?? for instance why cant i simply get which Classloader loaded my class using (new Test()).getClassLoader() ? , Well you need to differentiate between classes and objects.
code :
Test t = new Test()
ClassLoader cl =  t.getClass().getClassLoader();


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What is the difference between "Class.forName()" and "Class.forName().newInstance()"?

What is the difference between "Class.forName()" and "Class.forName().newInstance()"?


By : Zac Bohon
Date : March 29 2020, 07:55 AM
Hope this helps Maybe an example demonstrating how both methods are used will help you to understand things better. So, consider the following class:
code :
package test;

public class Demo {

    public Demo() {
        System.out.println("Hi!");
    }

    public static void main(String[] args) throws Exception {
        Class clazz = Class.forName("test.Demo");
        Demo demo = (Demo) clazz.newInstance();
    }
}
Hi!
Class.forName("acme.db.Driver");
package acme.db;

public class Driver {

    static {
        java.sql.DriverManager.registerDriver(new Driver());
    }

    ...
}
Getting ClassNotFoundException on code: "Class.forName("com.microsoft.sqlserver.jdbc.SqlServerDriver");&q

Getting ClassNotFoundException on code: "Class.forName("com.microsoft.sqlserver.jdbc.SqlServerDriver");&q


By : BoatyMcBoatface
Date : March 29 2020, 07:55 AM
I hope this helps you . According to this page, the class is called SQLServerDriver and not SqlServerDriver. Case is important!
So, try:
code :
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
difference between Class.forName("Something") and Class.forName("Something").newInstance();

difference between Class.forName("Something") and Class.forName("Something").newInstance();


By : MD.Simon Islam
Date : March 29 2020, 07:55 AM
like below fixes the issue What is the difference between Class.forName("Something"); and Class.forName("Something").newInstance(); Please clarify me.
code :
Class.forName("Somthing"); 
Class.forName("Somthing").newInstance();
"Class.forName("org.mariadb.jdbc.Driver");"can not work

"Class.forName("org.mariadb.jdbc.Driver");"can not work


By : Iam Saam
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , You need to add the driver jar to WEB-INF/lib in your Tomcat application / war file.
Casting Class.forName("java.lang.String") / 'Class.forName("some_str_var")' to Class<String>:

Casting Class.forName("java.lang.String") / 'Class.forName("some_str_var")' to Class<String>:


By : Vishakha Khona
Date : March 29 2020, 07:55 AM
help you fix your problem The compiler doesn't give any special treatment to the string constant "java.lang.String" in this call:
code :
Class.forName("java.lang.String")
String className = "java.lang.String";
Class<String> stringClass = Class.forName(className);
Class<String> stringClass = Class.forName("java.lang.String");
Class<String> stringClass = String.class
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