Bug 155496 Due to inactivity, a group report gives NULL Pointer Exception on selection of TOC and Export CSV option
Steps to reproduce this issue:- 1. Access any Group report that lists groups in TOC 2. For some time do not do any activity on report page (say 15 mins.) 3. Now click on Toggle Table Contents Link 4. The pop window gets opened with following error message java.lang.NullPointerException org.apache.axis.AxisFault.makeFault(AxisFault.java:101) org.eclipse.birt.report.soapengine.processor.AbstractBaseComponentProcessor.process(Unknown Source) org.eclipse.birt.report.soapengine.endpoint.BirtSoapBindingImpl.getUpdatedObjects(Unknown Source) sun.reflect.GeneratedMethodAccessor80.invoke(Unknown Source) When page remains idle for some time the same error gets displayed on selection of Export CSV option. Note:- This issue occurs for the reports that are run using '__overwrite' option. Any help on this is highly appreciated.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
}
		return parameterValues;
	}
	/**
	 * Preprocess a string.
	 * 
	 * @param string
	 *            the string to process.
	 * @return a string which is not null and without excessive spaces.
	 */
	protected static String preProcess( String string )
	{
		return string == null ? "" : string.trim( ); 
	}
	/**
	 * Convert UTF-8 string into ISO-8895-1
	 * 
	 * @param s
	 *            UTF-8 string
	 * @return
	 */
	protected static String toISOString( String s )
	{
		String ISOString = s;
		if ( s != null )
		{
			try
			{
				ISOString = new String( s.getBytes( UTF_8_ENCODE ),
						ISO_8859_1_ENCODE );