using Eclipse How to set classpath for other class residing in other plugins

Hi
using Eclipse How to set classpath for other class residing in other
plugins.
Actually I have developed two  pluging and i want to use one metho in a
class  of second plugin in a class of first plugin.
It is giving folloging eroor in  log file


!SESSION Feb 03, 2003 12:15:20.656
---------------------------------------------
java.version=1.3.1_01
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US
Command-line arguments: -dev bin -data D:
\EclipseFramework\eclipse\runtime-workspace -os win32 -ws win32 -arch x86
!ENTRY org.eclipse.ui 4 4 Feb 03, 2003 12:15:20.671
!MESSAGE Unhandled exception caught in event loop.
!ENTRY org.eclipse.ui 4 0 Feb 03, 2003 12:15:20.687
!MESSAGE com/snstech/tcdt/core/generator/MyTc
!STACK 0
java.lang.NoClassDefFoundError: com/snstech/tcdt/core/generator/MyTc
      at com.snstech.tcdt.ui.actions.SampleAction.run(SampleAction.java:66)
      at
org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:210)
      at
org.eclipse.ui.internal.WWinPluginAction.runWithEvent(WWinPluginAction.java:180)
      at
org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:407)
      at
org.eclipse.jface.action.ActionContributionItem.handleWidgetEvent(ActionContributionItem.java:361)
      at
org.eclipse.jface.action.ActionContributionItem.access$0(ActionContributionItem.java:352)
      at
org.eclipse.jface.action.ActionContributionItem$ActionListener.handleEvent(ActionContributionItem.java:47)
      at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:77)
      at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:827)
      at
org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:1529)
      at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1291)
      at
org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1343)
      at org.eclipse.ui.internal.Workbench.run(Workbench.java:1326)
      at
org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoader.java:831)
      at org.eclipse.core.boot.BootLoader.run(BootLoader.java:432)
      at EclipseRuntimeLauncher.main(EclipseRuntimeLauncher.java:24)

Please give a solution what to do
with regards
Vijay Kumar