ClassNotFoundException when load script

// ClassNotFoundException when load script
// for example, the following is test.scala file:

import
org.apache.commons.dbcp.BasicDataSource;

import
javax.sql.DataSource;

val cn = "org.postgresql.Driver"
val cloader = Class.forName("org.postgresql.Driver").getClassLoader()
Class.forName(cn).newInstance()

println("ok, you find
me in classpath", cloader.loadClass(cn))

val dds:
BasicDataSource = new BasicDataSource();

dds.setDriverClassName("org.postgresql.Driver");

dds.setUrl("jdbc:postgresql://localhost/test");

dds.setUsername("postgres");
dds.setPassword("111111");

dds.getConnection().close();

/*-

When I load
it from the interpreter ( :load test.scala ), the code will throw the
exception:
java.lang.ClassNotFoundException:
org.postgresql.Driver

But if I run it from the command
line such as "scala test.scala", it will run without errors.

Why and how to do it right? I just don't want to load it as a script
file, because I need to do something further interactively. I really
hope I can benefit from scala console( groovy console maybe work, I
didn't try, anyway it is too slow)

Actually, I have a
program built upon spring, which runs correctly when executed as a
script file( in the script I create a ClassPathXmlApplicationContext and then use it's components) but throws this exception when loaded
interactively. I'm not sure whether spring and apache dbcp just have the same problems.

I use scala 2.7.7.final.

thanks.

*/

Hello, where did you put your driver class? Could you give us your project structure in detail?


On Tue, May 18, 2010 at 4:53 AM, ZhangQidi <zhangqidicn [at] yahoo [dot] com [dot] cn> wrote:

 // ClassNotFoundException when load script
   // for example, the following is test.scala file:

   import
org.apache.commons.dbcp.BasicDataSource;

   import
javax.sql.DataSource;

   val cn = "org.postgresql.Driver"
   val cloader = Class.forName("org.postgresql.Driver").getClassLoader()
   Class.forName(cn).newInstance()

   println("ok, you find
me in classpath", cloader.loadClass(cn))

   val dds:
BasicDataSource = new BasicDataSource();

dds.setDriverClassName("org.postgresql.Driver");

dds.setUrl("jdbc:postgresql://localhost/test");

dds.setUsername("postgres");
   dds.setPassword("111111");

   dds.getConnection().close();

   /*-

   When I load
it from the interpreter ( :load test.scala ), the code will throw the
exception:
   java.lang.ClassNotFoundException:
org.postgresql.Driver

   But if I run it from the command
line such as "scala test.scala", it will run without errors.

   Why and how to do it right? I just don't want to load it as a script
file, because I need to do something further interactively. I really
hope I can benefit from scala console( groovy console maybe work, I
didn't try, anyway it is too slow)

   Actually, I have a
program built upon spring, which runs correctly when executed as a
script file( in the script I create a ClassPathXmlApplicationContext and then use it's components) but throws this exception when loaded
interactively. I'm not sure whether spring and apache dbcp just have the same problems.

   I use scala 2.7.7.final.


thanks.

   */

--
Sincerely yours and Best Regards,
Xie Xiaodong

I have an executable test_scala.bat file which looks like this:

---
set JAVA_OPTS=-Xmx1400m -Xms1400m
set mydir=d:\test
scala -encoding GBK -classpath %mydir%\lib\*;%mydir%\conf test.scala
--

test.scala file looks like this:

--

import org.apache.commons.dbcp.BasicDataSource;

import javax.sql.DataSource;

val cn = "org.postgresql.Driver"
val cloader = Class.forName("org.postgresql.Driver").getClassLoader()
Class.forName(cn).newInstance()

println("ok, you find me in classpath", cloader.loadClass(cn))

val dds: BasicDataSource = new BasicDataSource();
dds.setDriverClassName("org.postgresql.Driver");
dds.setUrl("jdbc:postgresql://localhost/test");
dds.setUsername("postgres");
dds.setPassword("111111");

dds.getConnection().close();

--

And if I run test_scala.bat, it will run without any errors.

But if I run:

scala -encoding GBK -classpath d:\test\lib\*;d:\test\conf

(and then in scala console:)
:load test.scala


the ClassNotFoundException will be thrown out. But the message "ok,find me" shows that the class has been loaded successfully, so I think the classpath is not the problem.

(ok,find me,class org.postgresql.Driver)
java.lang.ClassNotFoundException: org.postgresql.Driver
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoa...