Bug 189813 After modify a wrong preview report, when preview in Web viewer it can not process the document file[1102]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/ReportDocumentWriter.java
try
			{
				saveCoreStreams( );
			}
			finally
			{				
				archive.unlock( lock );
			}
		}
		catch ( Exception e )
		{
			logger.log( Level.SEVERE, "Failed in initializing the archive", e );
		}
	}
	public IDocArchiveWriter getArchive( )
	{
		return this.archive;
	}
	public void close( )
	{
		try
		{
			Object lock = archive.lock( CORE_STREAM );
			try
			{
				checkpoint = CHECKPOINT_END;
				saveCoreStreams( );
			}
			finally
			{