Beanshell jdbc connection

Question

Hi,

i want to connect to my database using beanshell script. my code works with java but beanshell doesn't work with the same code. Class not found exception will be thrown. does it have other usage or can't i connect to database with beanshell?

Thanks, Bilal

Answer 1

A ClassNotFoundException simply means that the in the message mentioned class is missing in the runtime classpath. Just add the JDBC driver JAR file to the runtime classpath of the beanshell script. Here's an extract of the documentation:

Changing the Class Path

addClassPath( URL | path )

Add the specified directory or archive to the classpath. Archives may be located by URL, allowing them to be loaded over the network.

Examples:

addClassPath( "/home/pat/java/classes" );
addClassPath( "/home/pat/java/mystuff.jar" );
addClassPath( new URL("http://myserver/~pat/somebeans.jar") );

Then, to load the driver class, you need to use Beanshell's provided getClass() method instead of the standard Class#forName(). Here's an extract of the documentation:

Loading Classes Explicitly

In order to perform an explicit class lookup by name while taking into account any BeanShell class path modification you must use a replacement for the standard Class.forName() method.

The getClass() command will load a class by name, using the BeanShell classpath. Alternately, you can consult the class manager explicitly:

name="foo.bar.MyClass";
c = getClass( name );
c = BshClassManager.classForName( name );  // equivalent

Answer 2

@ Plínio Pantaleão the code is like this

addClassPath("C:\\mysql-connector-java-5.1.13\\mysql-connector-java-5.1.13-bin.jar");
import com.mysql.jdbc.Driver;
import java.sql.Connection;

Connection conn = null;

Class.forName("com.mysql.jdbc.Driver").newInstance();

and the exception is

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.gjt.sp.jedit.bsh.Reflect.invokeMethod(Reflect.java:134)
at org.gjt.sp.jedit.bsh.Reflect.invokeStaticMethod(Reflect.java:98)
at org.gjt.sp.jedit.bsh.Name.invokeMethod(Name.java:871)
at org.gjt.sp.jedit.bsh.BSHMethodInvocation.eval(BSHMethodInvocation.java:75)
at org.gjt.sp.jedit.bsh.BSHPrimarySuffix.doSuffix(BSHPrimarySuffix.java:102)
at org.gjt.sp.jedit.bsh.BSHPrimaryExpression.eval(BSHPrimaryExpression.java:80)
at org.gjt.sp.jedit.bsh.BSHPrimaryExpression.eval(BSHPrimaryExpression.java:47)
at org.gjt.sp.jedit.bsh.Interpreter.eval(Interpreter.java:644)
at org.gjt.sp.jedit.bsh.Interpreter.eval(Interpreter.java:738)
at org.gjt.sp.jedit.bsh.Interpreter.eval(Interpreter.java:727)
at org.gjt.sp.jedit.BeanShellFacade._eval(BeanShellFacade.java:148)
at org.gjt.sp.jedit.BeanShellFacade.eval(BeanShellFacade.java:113)
at org.gjt.sp.jedit.BeanShellFacade.evalSelection(BeanShellFacade.java:85)
at org.gjt.sp.jedit.BeanShell.evalSelection(BeanShell.java:71)
at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.gjt.sp.jedit.bsh.Reflect.invokeMethod(Reflect.java:134)
at org.gjt.sp.jedit.bsh.Reflect.invokeStaticMethod(Reflect.java:98)
at org.gjt.sp.jedit.bsh.Name.invokeMethod(Name.java:871)
at org.gjt.sp.jedit.bsh.BSHMethodInvocation.eval(BSHMethodInvocation.java:75)
at org.gjt.sp.jedit.bsh.BSHPrimaryExpression.eval(BSHPrimaryExpression.java:102)
at org.gjt.sp.jedit.bsh.BSHPrimaryExpression.eval(BSHPrimaryExpression.java:47)
at org.gjt.sp.jedit.bsh.BSHBlock.evalBlock(BSHBlock.java:130)
at org.gjt.sp.jedit.bsh.BSHBlock.eval(BSHBlock.java:80)
at org.gjt.sp.jedit.bsh.BshMethod.invokeImpl(BshMethod.java:362)
at org.gjt.sp.jedit.bsh.BshMethod.invoke(BshMethod.java:258)
at org.gjt.sp.jedit.bsh.BshMethod.invoke(BshMethod.java:186)
at org.gjt.sp.jedit.BeanShellFacade.runCachedBlock(BeanShellFacade.java:225)
at org.gjt.sp.jedit.BeanShell.runCachedBlock(BeanShell.java:423)
at org.gjt.sp.jedit.BeanShellAction.invoke(BeanShellAction.java:73)
at org.gjt.sp.jedit.gui.InputHandler.invokeAction(InputHandler.java:352)
at org.gjt.sp.jedit.jEdit$4.invokeAction(jEdit.java:3255)
at org.gjt.sp.jedit.jEdit$4.invokeAction(jEdit.java:3237)
at org.gjt.sp.jedit.EditAction$Wrapper.actionPerformed(EditAction.java:221)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)