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
public static final String INIT_PARAM_DOCUMENT_FOLDER_ACCESS_ONLY = "DOCUMENT_FOLDER_ACCESS_ONLY"; 
	/**
	 * The parameter name that gives the repository lication to put the created
	 * documents and report design files.
	 */
	public static final String INIT_PARAM_DOCUMENT_FOLDER = "BIRT_VIEWER_DOCUMENT_FOLDER"; 
	/**
	 * Servlet parameter name that gives the absolute resource location
	 * directory.
	 */
	public static final String INIT_PARAM_BIRT_RESOURCE_PATH = "BIRT_RESOURCE_PATH"; 
	/**
	 * Servlet parameter name that gives preview report max rows limited.
	 */
	public static final String INIT_PARAM_VIEWER_MAXROWS = "BIRT_VIEWER_MAX_ROWS"; 
	/**
	 * UTF-8 encode constants.
	 */
	public static final String UTF_8_ENCODE = "UTF-8"; 
	/**
	 * ISO-8859-1 encode constants.
	 */
	public static final String ISO_8859_1_ENCODE = "ISO-8859-1"; 
	/**
	 * Separator that connects the query parameter values.
	 */
	public static final String PARAMETER_SEPARATOR = "&"; 
	/**
	 * The character to start the query string in the url.
	 */