Bug 165278 this.getDisplayContent()="" in script of text will destroy preview[0801]
Description: this.getDisplayContent()="" in script of text will destroy preview Build number:2.1.2.v20061120 and 2.2.0.v20061117 Steps to reproduce: 1. Insert a text item, select it and switch to script editor 2. Input this.getDisplayContent()="" and preview Expected result: Error message about the incorrect script. Actual result: In 2.1.2, I saw HTTP Status 500 - type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. In 2.2.0, I saw error dialog with java.lang.ClassCastException.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ExecutionContext.java
}
		protected ClassLoader getAppClassLoader( )
		{
			Map appContext = context.getAppContext( );
			if ( appContext != null )
			{
				Object appLoader = appContext
						.get( EngineConstants.APPCONTEXT_CLASSLOADER_KEY );
				if ( appLoader instanceof ClassLoader )
				{
					return (ClassLoader) appLoader;
				}
			}
			return null;
		}
		protected ClassLoader createClassLoaderFromDesign( ClassLoader parent )
		{
			IReportRunnable runnable = context.getRunnable( );
			if ( runnable != null )
			{
				ModuleHandle module = (ModuleHandle) runnable.getDesignHandle( );
				ArrayList urls = new ArrayList( );
				Iterator iter = module.scriptLibsIterator( );
				while ( iter.hasNext( ) )
				{
					ScriptLibHandle lib = (ScriptLibHandle) iter.next( );
					String libPath = lib.getName( );
					URL url = module.findResource( libPath,
							IResourceLocator.LIBRARY );
					if ( url != null )