Getting xml serializer exception

Question

dont know what this mean, did anybody got this exception before.
Searched on google but got few results only which were not helpful.
Frustrated posting this here . if anybody has seen this and resolved this , give me tips on how to get this working or atleast what could be cause of this problem.
java.lang.NullPointerException
at org.apache.xml.serialize.OutputFormat.whichMethod(Unknown Source)
at org.apache.xml.serialize.OutputFormat.<init>(Unknown Source)
at com.tibco.portalservices.administrator.AbstractDOMDeploymentDescriptorEditor.update(AbstractDOMDeploymentDesc
riptorEditor.java:125)
at com.tibco.wfc.AbstractContainer.update(AbstractContainer.java:32)
at com.tibco.wfc.AbstractContainer.update(AbstractContainer.java:32)
at com.tibco.administrator.consoles.deploymentconfiguration.ServiceDetailPane.update(ServiceDetailPane.java:94)
at com.tibco.wfc.AbstractContainer.update(AbstractContainer.java:32)
at com.tibco.wfc.AbstractContainer.update(AbstractContainer.java:32)
at com.tibco.wfc.AbstractFrame.update(AbstractFrame.java:101)
at com.tibco.wfc.FramesetComponent.update(FramesetComponent.java:186)
at com.tibco.wfc.AbstractContainer.update(AbstractContainer.java:32)
at com.tibco.wfc.AbstractFrame.update(AbstractFrame.java:101)
at com.tibco.wfc.FrameManager.a(FrameManager.java:235)
at com.tibco.wfc.FrameManager.service(FrameManager.java:142)
at com.tibco.administrator.AdministratorServlet.service(AdministratorServlet.java:843)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2416)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:577)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1040)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1151)
at java.lang.Thread.run(Thread.java:595)

Answer 1

There is no HashMap in your ArrayList. Take a look at this line:
selectedDataList.add(searchList);I think a object f type SearchBean is added to the list here. This is no HashMap I presume.
Please use code tags when posting code. This looks lke this:
public String getSelectedItems() {
// Get selected items.
HashMap map = new HashMap();
DeleteContentDialog deleteContentDialog = new DeleteContentDialog();
selectedDataList = new ArrayList();
for (SearchBean searchList : searchResultdetails) {
System.out.println("Inside getSelectedItems.........Inside for"+searchList);
if (searchList.isSelected()) {
System.out.println("Inside getSelectedItems........searchList."+searchList);
selectedDataList.add(searchList);
searchList.setSelected(false); // Reset.
try {
for(int i=0;i<selectedDataList.size();i++){
System.out.println("Inside the delete Method");
System.out.println("selectedDataList is "+selectedDataList.get(i));
if (selectedDataList.size() != 0)
System.out.println("Array List is having = "selectedDataList.size()" records");
//printValuesTest(medianList);
System.out.println("**************THESE ARE THE VALUES OF THE HASHMAP AT THE INDEX = "+i);
map = (HashMap)selectedDataList.get(i);
if (map.size() != 0)
Iterator iterator = map.keySet().iterator();
while (iterator.hasNext())
String key = (String) iterator.next();
String value = (String) map.get(key);
System.out.println("Key = "key " and Value = "+value);
deleteContentDialog.init(map);
else
System.out.println("Hashmap is empty");
catch(Exception e){
e.printStackTrace();
return "deletedFile"; // Navigation case.
}