Bug 159380 [regression]Not find DataEngineContextExt class cause all engine/dte smoke testing fail
Description Not find DataEngineContextExt class cause all engine/dte smoke testing fail Steps to reproduce: Run Engine/DTE smoke testing framework Expected result&#65306; Outputs are correct. Actaul result: All outputs are 0kb with Exception: Error happened while running the report. java.lang.NoClassDefFoundError: org/eclipse/birt/data/engine/impl/DataEngineContextExt at org.eclipse.birt.data.engine.api.DataEngineContext.setTmpdir(DataEngineContext.java:374) at org.eclipse.birt.report.engine.data.dte.DteDataEngine.<init>(DteDataEngine.java:71) at org.eclipse.birt.report.engine.data.DataEngineFactory.createDataEngine(DataEngineFactory.java:94) at org.eclipse.birt.report.engine.executor.ExecutionContext.getDataEngine(ExecutionContext.java:694) at org.eclipse.birt.report.engine.executor.ReportExecutor.execute(ReportExecutor.java:99) at org.eclipse.birt.report.engine.internal.executor.l18n.LocalizedReportExecutor.execute(LocalizedReportExecutor.java:38) at org.eclipse.birt.report.engine.layout.html.HTMLReportLayoutEngine.layout(HTMLReportLayoutEngine.java:68) at org.eclipse.birt.report.engine.api.impl.RunAndRenderTask.run(RunAndRenderTask.java:207) at org.eclipse.birt.report.engine.api.ReportRunner.runAndRenderReport(ReportRunner.java:237) at org.eclipse.birt.report.engine.api.ReportRunner.execute(ReportRunner.java:162) at org.eclipse.birt.report.engine.api.ReportRunner.main(ReportRunner.java:118)
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/api/DataEngineContext.java
* stream needs to be closed by caller, and then caller requires to add
	 * buffer stream layer when needed.
	 * 
	 * @param streamID
	 * @param subStreamID
	 * @param streamType
	 * @return output stream for specified streamID, subStreamID and streamType
	 */
	public OutputStream getOutputStream( String streamID, String subStreamID,
			int streamType ) throws DataException
	{
		assert writer != null;
		
		String relativePath = getPath( streamID, subStreamID, streamType );
		
		try
		{
			OutputStream outputStream = writer.createRandomAccessStream( relativePath );
			if ( outputStream == null )
				throw new DataException( ResourceConstants.RD_SAVE_STREAM_ERROR );
			return outputStream;
		}
		catch (IOException e)
		{
			throw new DataException( ResourceConstants.RD_SAVE_STREAM_ERROR, e );
		}
	}
	/**
	 * Determins whether one particular stream exists
	 *