Printing java object in the method
How to print the object that has called the method in the method itself.
class abc{
public method1()
S.o.p("Print the object that has called this method")
psvm(string a[])
abc aa=new abc();
aa.method1();
Thanks
Sir
Or make a new exception and parse the stack trace.
This has a performance penalty, though.That wont get the object that's making the call (the 'this' of the method that's making the call), but only the class and the method
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How to create new java objects in native methods?
Hello,
Is it possible to create java objects and return the same to the java code from a native method?
Also is it possible to pass java objects other than String objects (for example, Vector objects) as parameters to native methods and is it possible to return such objects back to the java code?
If so how can I access those objects (say for example, accessing Vector elements) inside the native code?
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Regards,
Satishbschauwe is correct in that constructing Java objects and calling methods on Java objects from native code is tough and takes some study. While you're at it, you might want to check out Jace, http://jace.reyelts.com/jace. It's a free open-source toolkit that really takes the nastiness out of doing this sort of stuff. For example,/**
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When I hit the url at the first time my call goes to the spring controller and sets the userDetails objects in the modelAndView.addObject("userDetails", userDetails.getUserDetails()) and returns the userDetails.html page. if I click any link in the same page i want to pass same (userDetails) object thru javascript or jquery and calls the another(controller) method and returns the same (userDetails.html) page.
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How can I persist a Java object to the PCD via JNDI ?
Hi,
I'm trying to persist XML data on the PCD via JNDI. I'm using
portal version 6.2.0.4.200408172051.
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The example they showed was:
import javax.naming.Context;
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I don't know what I've done wrong. I couldn't find any more documentation
on this topic...
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cheers,
Michael
javax.naming.NameNotFoundException: [Xfs] Object not found. Root exception is javax.naming.NamingException: [Xfs] Object not found
at com.sapportals.portal.pcd.gl.xfs.BasicContext.lookup(BasicContext.java:840)
at com.sapportals.portal.pcd.gl.PcdPersContext.lookup(PcdPersContext.java:422)
at com.sapportals.portal.pcd.gl.PcdFilterContext.filterLookup(PcdFilterContext.java:387)
at com.sapportals.portal.pcd.gl.PcdProxyContext.basicContextLookup(PcdProxyContext.java:1083)
at com.sapportals.portal.pcd.gl.PcdProxyContext.proxyLookupLink(PcdProxyContext.java:1170)
at com.sapportals.portal.pcd.gl.PcdProxyContext.proxyLookup(PcdProxyContext.java:1132)
at com.sapportals.portal.pcd.gl.PcdProxyContext.getBasicObject(PcdProxyContext.java:1330)
at com.sapportals.portal.pcd.gl.PcdProxyContext.getBasicContext(PcdProxyContext.java:1306)
at com.sapportals.portal.pcd.gl.PcdProxyContext.rebind(PcdProxyContext.java:473)
at com.sapportals.portal.pcd.gl.PcdGlContext.rebind(PcdGlContext.java:1185)
at com.sapportals.portal.pcd.gl.PcdProxyContext.rebind(PcdProxyContext.java:515)
at com.sapportals.portal.pcd.gl.PcdProxyContext.rebind(PcdProxyContext.java:683)
at com.sapportals.portal.pcd.gl.PcdProxyContext.rebind(PcdProxyContext.java:688)
at com.sapportals.portal.prt.jndisupport.util.AbstractContextWrapper.rebind(AbstractContextWrapper.java:46)
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at com.inqmy.services.servlets_jsp.server.InvokerServlet.service(InvokerServlet.java:126)
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at com.inqmy.services.servlets_jsp.server.RunServlet.runSerlvet(RunServlet.java:149)
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at com.inqmy.core.service.context.container.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:36)
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here my comments to your questions:
0.:[Michael says:]
"So basically you're saying that under SP10 its not possible to store objects on the PCD ... ?"
I want to clarify this:
It is possible to store objects in the PCD in lower releases than SP10 (e.g. SP2). But due to the fact that PCD API is not public before SP10 you should not develop a SP2 iView that programmatically uses the PCD API and complain afterwards because some "tiny" things of it are not working in SP10. It might be that you have to adjust some parts of this SP2 iView.
The kind of object that can be stored in the PCD depends on the fact if the objects have a corresponding object provider or not. If you want to store iViews, roles or one of the other commonly known portal objects you can do it because corresponding object provider (iViewservice, roleservice, etc.) are always available in a running portal.
If you want to store objects (like your BeanWrapper class) then you should write a corresponding object provider (what I explained in my first reply).
1.:[Michael asked:]
Why does list and listBindings fail ? surely that should just
list the existing bound objects ???
Nothing was bound!
Your code line
applicationContext.rebind("PCD_LOOKUP_KEY", d);
throws a NamingException because no object provider for class of object d was found.
So I gess you did a lookup on applicationContext.lookup( "PCD_LOOKUP_KEY" ) before you did the list/listBindings and because this
context does not exist the corresponding "Name not found" exception was thrown?
A list/listBinding on the applicationContext itself should work even if nothing was bound.
2.:[Michael asked:]
Is there not some kind of default object/object provider pair
that can be used to store base types like Strings/Integers etc ?
No. There are no default object providers for java string/integers. But for this case "persisting a string or integer value at any PCD context" the PCD offers another way to do it: Just create an additional attribute (of type STRING or INT) and persist the corresponding value in this attribute (of type IPcdAttribute - an extension of javax.naming.directory.Attribute )
The code for creating a pcd attribute looks e.g. like this:
IPcdObjectFactory pcdObjFactory = ((IPcdGlService) PortalRuntime
.getRuntimeResources()
.getService(IPcdGlService.KEY))
.getPcdObjectFactory();
IPcdAttribute newPcdAttr = pcdObjFactory.createPcdAttribute( PcdAttributeValueType.STRING,
"new_attrId" );
newPcdAttr.set( 0,
"new_AttrValue" );
ModificationItem mods[] = new ModificationItem[1];
mods[0] = new ModificationItem( DirContext.REPLACE_ATTRIBUTE,
(Attribute)newPcdAttr );
pcdCtx.modifyAttributes( "",
mods );
Hope, that helps you!
Regards,
Jens -
How to store java objects in the database
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thanks and regard
Mac
Message was edited by:
LoveOpensourceYou probably need to rethink your design. Where are these child classes going? What is using or consuming them? I agree with the message above about a button instantiating a parent field variable to one child or the other depending on which button is pressed.
Message was edited by:
petes1234 -
Which object called the method
Suppose there is a class A which has three objects a1,a2,a3 and a method m. Now I'd like to know which particular object has called the method m.
>
which particular object has called the method
What class called my method
http://developer.java.sun.com/developer/qow/archive/104
a.The advice in the posted link is unreliable as the format of printStackTrace() is not standardized. A more reliable way to find out the calling class is to use SecurityManager.getClassContext() or Throwable.getStackTrace() [in JDK 1.4+].
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The BlazeDS documentation shows how to explicitly map between ActionScript and Java objects. For example, this works fine for RPC services, e.g.
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import flash.utils.IDataInput;
import flash.utils.IDataOutput;
[Bindable]
[RemoteClass(alias="javaclass.User")]
public class User implements IExternalizable {
public var id : String;
public var secret : String;
public function User() {
public function readExternal(input : IDataInput) : void {
id = input.readObject() as String;
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output.writeObject(id);
and
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import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
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protected String secret;
public String getId() {
return id;
public void setId(String id) {
this.id = id;
public String getSecret() {
return secret;
public void setSecret(String secret) {
this.secret = secret;
public void readExternal(ObjectInput in) throws IOException,
ClassNotFoundException {
id = (String) in.readObject();
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out.writeObject(id);
If I called an RPC service that returns a User, the secret is not sent over the wire. Is it also possible to do this for the messaging service? That is, if I create a custom messaging adapter and use the function below, can I also prevent secret from being sent?
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AsyncMessage message = new AsyncMessage();
message.setDestination("MyMessagingService");
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message.setMessageId(UUIDUtils.createUUID());
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user.setId("id");
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message.setBody(user);
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private int empId;
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Passing JAVA objects to different methods
As you can see that
"public static IntervalCategoryDataset createDataset()" want to get the data and attributes from storeStartDate and storeEndDate methods. i have class files, StartDate and EndDate that contains all the accessor methods. after i have store the relevant attributes, i want to call it out in the "public static IntervalCategoryDataset createDataset()" method to manipulate it.
i hope that my question doesn't confuse you all. hope that you all can guide me on this. Thank you
package ericTest;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.text.ParseException;
import java.util.StringTokenizer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Calendar;
import java.util.Date;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.data.category.IntervalCategoryDataset;
import org.jfree.data.gantt.Task;
import org.jfree.data.gantt.TaskSeries;
import org.jfree.data.gantt.TaskSeriesCollection;
import org.jfree.data.time.SimpleTimePeriod;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
import Gantt.Chart;
import com.db4o.Db4o;
import com.db4o.ObjectContainer;
import com.db4o.ObjectSet;
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private static ObjectContainer db;
private static String day;
private static String month;
private static String year;
private static String task;
private static String startDate;
private static String endDate;
private static String startDay;
private static String startMonth;
private static String startYear;
public static int startDay1;
public static int startMonth1;
public static int startYear1;
public static int startDay2;
public static int startMonth2;
public static int startYear2;
public static String endDay;
public static String endMonth;
public static String endYear;
public static int endDay1;
public static int endMonth1;
public static int endYear1;
public static int endDay2;
public static int endMonth2;
public static int endYear2;
DataInputStream dis = null;
String fileRecord = null;
public GanttDemo3(final String title) {
super(title);
final IntervalCategoryDataset dataset = createDataset();
final JFreeChart chart = createChart(dataset);
// add the chart to a panel...
final ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
setContentPane(chartPanel);
public final static String filename = "C:\\KLGCC Mock Up.yap";
public void storeData() throws IOException{
new File(filename).delete();
db = Db4o.openFile(filename);
File f = new File("C:\\KLGCC Mock Up.txt");
FileReader fis = new FileReader(f);
BufferedReader bis = new BufferedReader(fis);
while((fileRecord = bis.readLine()) != null){
StringTokenizer st = new StringTokenizer(fileRecord,",");
task = st.nextToken();
startDate = st.nextToken();
endDate = st.nextToken();
Country c = new Country(task, startDate, endDate);
db.set(c);
db.close();
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db = Db4o.openFile(filename);
Country c = new Country();
ObjectSet result = db.get(c);
while(result.hasNext()){
Country obj = (Country)result.next();
String sDate = obj.getStartDate();
StringTokenizer str = new StringTokenizer(sDate, "/");
startMonth = str.nextToken();
startDay = str.nextToken();
startYear = str.nextToken();
int startMonth1 = Integer.parseInt(startMonth);
int startDay1 = Integer.parseInt(startDay);
int startYear1 = Integer.parseInt(startYear);
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ArrayList<Integer> startDay2 = new ArrayList<Integer>();
startDay2.add(startDay1);
ArrayList<Integer> startMonth2 = new ArrayList<Integer>();
startMonth2.add(startMonth1);
ArrayList<Integer> startYear2 = new ArrayList<Integer>();
startYear2.add(startYear1);
db.close();
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db = Db4o.openFile(filename);
Country c = new Country();
ObjectSet result = db.get(c);
while(result.hasNext()){
Country obj = (Country)result.next();
String sEndDate = obj.getEndDate();
StringTokenizer str1 = new StringTokenizer(sEndDate, "/");
endMonth = str1.nextToken();
endDay = str1.nextToken();
endYear = str1.nextToken();
int endMonth1 = Integer.parseInt(endMonth);
int endDay1 = Integer.parseInt(endDay);
int endYear1 = Integer.parseInt(endYear);
EndDate ed = new EndDate(endDay1, endMonth1, endYear1);
ArrayList<Integer> endDay2 = new ArrayList<Integer>();
endDay2.add(startDay1);
ArrayList<Integer> endMonth2 = new ArrayList<Integer>();
endMonth2.add(endMonth1);
ArrayList<Integer> endYear2 = new ArrayList<Integer>();
endYear2.add(endYear1);
db.close();
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final TaskSeries s1 = new TaskSeries("Scheduled");
StartDate sd = new StartDate(startDay1, startMonth1, startYear1);
EndDate ed = new EndDate(endDay1, endMonth1, endYear1);
s1.add(new Task(task,
new SimpleTimePeriod(date(sd.getStartDay1(),sd.getStartDay1(), sd.getStartYear1()),
date(ed.getEndDay1(), ed.getEndMonth1(), ed.getendYear1()))));
System.out.println("dumb");
final TaskSeriesCollection collection = new TaskSeriesCollection();
collection.add(s1);
return collection;
* Utility method for creating <code>Date</code> objects.
* @param day the date.
* @param month the month.
* @param year the year.
* @return a date.
private static Date date(final int startDay2, final int startMonth2, final int startYear2) {
System.out.println("sdojsodj");
final Calendar calendar = Calendar.getInstance();
calendar.set(startYear2, startMonth2, startDay2);
final Date result = calendar.getTime();
return result;
* Creates a chart.
* @param dataset the dataset.
* @return The chart.
private JFreeChart createChart(final IntervalCategoryDataset dataset) {
final JFreeChart chart = ChartFactory.createGanttChart(
"Gantt Chart Demo", // chart title
"Task", // domain axis label
"Date", // range axis label
dataset, // data
true, // include legend
true, // tooltips
false // urls
// chart.getCategoryPlot().getDomainAxis().setMaxCategoryLabelWidthRatio(10.0f);
return chart;
public static void main(final String[] args) throws IOException, ParseException
final GanttDemo3 demo = new GanttDemo3("Gantt Chart Demo 1");
demo.storeData();
demo.storeStartDate();
//demo.storeEndDate();
//demo.pack();
//RefineryUtilities.centerFrameOnScreen(demo);
//demo.setVisible(true);
}the error that came out in eclipse is
Exception in thread "main" java.lang.IllegalArgumentException: Null 'description' argument.
at org.jfree.data.gantt.Task.<init>(Task.java:87)
at ericTest.GanttDemo3.createDataset(GanttDemo3.java:191)
at ericTest.GanttDemo3.<init>(GanttDemo3.java:78)
at ericTest.GanttDemo3.main(GanttDemo3.java:248)and if i replace this
public static IntervalCategoryDataset createDataset() {
final TaskSeries s1 = new TaskSeries("Scheduled");
StartDate sd = new StartDate(startDay1, startMonth1, startYear1);
EndDate ed = new EndDate(endDay1, endMonth1, endYear1);
s1.add(new Task(task,
new SimpleTimePeriod(date(sd.getStartDay1(),sd.getStartDay1(), sd.getStartYear1()),
date(ed.getEndDay1(), ed.getEndMonth1(), ed.getendYear1()))));
System.out.println("dumb");
final TaskSeriesCollection collection = new TaskSeriesCollection();
collection.add(s1);
return collection;
}with
public static IntervalCategoryDataset createDataset() {
final TaskSeries s1 = new TaskSeries("Scheduled");
Chart chart = new Chart();
s1.add(new Task(chart.getTitle(),
new SimpleTimePeriod(date(chart.getStartDay(), chart.getStartMonth(), chart.getStartYear()),
date(chart.getEndDay(), chart.getEndMonth(), chart.getEndYear()))));
System.out.println("dumb");
final TaskSeriesCollection collection = new TaskSeriesCollection();
collection.add(s1);
return collection;
}the chart class file has all the accessor methods and all the values is hard code. so the graph can be generated. the problem now is if i want to get the values from the StartDate and EndDate methods to get the dates so that i can put it into the createDataset method to add the values needed for the graph.
can anyone help me on this? thanks alot -
Parse of a xml file to an java object model
Hello,
I'm trying to do a program that receive an xml file and ought to create all the neccesary java objects according to the content of the parsed xml file.
I've all the class created for all the objects that could be present into the xml and the idea is to go down in the tree of nodes recursively until it returns nodes more simple. Then, I create the last object and while I come back of the recursively calls, I create the objects more complex until I reached to the main object.
Until now, I have part of this code, that is the one wich have to parse the parts of the xml.
public static void readFile(String root){
DocumentBuilderFactory factory = DocumentBuilderFactory
.newInstance();
try {
DocumentBuilder builder = factory.newDocumentBuilder();
Scanner scanner = new Scanner(new File(root)).useDelimiter("\\Z");
String contents = scanner.next();
scanner.close();
Document document = builder.parse(new ByteArrayInputStream(contents.getBytes()));
Node node = null;
NodeList nodes = null;
Element element = document.getDocumentElement();
System.out.println(element.getNodeName());
NodeList subNodes;
NamedNodeMap attributes;
//if (element.hasAttributes())
visitNodes(element);
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
private static void visitNodes (Node node){
for(Node childNode = node.getFirstChild(); childNode!=null;){
if (childNode.getNodeType() == childNode.DOCUMENT_NODE){
System.out.println("Document node Name " + childNode.getNodeName());
visitNodes(childNode);
}else if (childNode.getNodeType() == childNode.ELEMENT_NODE){
System.out.println("Node Name " + childNode.getNodeName());
if (childNode.hasAttributes()){
visitAttributes(childNode.getAttributes());
if (childNode.hasChildNodes()){
visitNodes(childNode);
}else if (childNode.getNodeType() == childNode.TEXT_NODE && !childNode.getNodeValue().contains("\n\t")){
System.out.println("Node value " + childNode.getNodeValue());
Node nextChild = childNode.getNextSibling();
childNode = nextChild;
private static void visitAttributes(NamedNodeMap attributes){
Node node;
for(int i = 0; i < attributes.getLength(); i++){
node = attributes.item(i);
System.out.print(node.getNodeName() + " ");
System.out.print(node.getNodeValue() + " ");
}I don't know the use of childNodeType. For example, I expected that the XML tags with childs in his structure, enter by the option NODE_DOCUMENT and the tags without childs by the ELEMENT_NODE.
But the most important problem I've found are the nodes [#text] because after one ELEMENT_NODE I always found this node and when I ask if the node hasChilds, always returns true by this node.
Has any option to obtain this text value, that finally I want to display without doing other recursively call when I enter into the ELEMENT_NODE option?
When one Node is of type DOCUMENT_NODE or DOCUMENT_COMMENT? My program always enter by the ELEMENT_NODE type
Have you any other suggestions? All the help or idea will be well received.
Thanks for all.Hello again,
My native language is Spanish and sorry by my English I attemp write as better I can, using my own knowledge and the google traductor.
I have solved my initial problem with the xml parser.
Firstly, I read the complete XML file, validated previously.
The code I've used is this:
public static String readCompleteFile (String root){
String content = "";
try {
Scanner scanner = new Scanner(new File(root)).useDelimiter("\\Z");
content = scanner.next();
scanner.close();
} catch (IOException e) {
e.printStackTrace();
return content;
}Now, I've the file in memory and I hope I can explain me better.
I can receive different types of XML that could be or not partly equals.
For this purpose I've created an external jar library with all the possible objects contained in my xml files.
Each one of this objects depend on other, until found leaf nodes.
For example, If I receive one xml with a scheme like the next:
<Person>
<Name>Juliet</Name>
<Father Age="30r">Peter</Father>
<Mother age="29">Theresa</Mother>
<Brother>
</Brother>
<Education>
<School>
</school>
</education>
</person>
<person>
</person>The first class, which initializes the parse, should selecting all the person tags into the file and treat them one by one. This means that for each person tag found, I must to call each subobject wich appears in the tag. using as parameter his own part of the tag and so on until you reach a node that has no more than values and or attributes. When the last node is completed I'm going to go back for completing the parent objects until I return to the original object. Then I'll have all the XML in java objects.
The method that I must implement as constructor in every object is similar to this:
public class Person{
final String[] SUBOBJETOS = {"Father", "Mother", "Brothers", "Education"};
private String name;
private Father father;
private Mother mother;
private ArrayList brothers;
private Education education;
public Person(String xml){
XmlUtil utilXml = new XmlUtil();
String xmlFather = utilXml.textBetweenXmlTags(xml, SUBOBJETOS[0]);
String xmlMother = utilXml.textBetweenXmlTags(xml, SUBOBJETOS[1]);
String xmlBrothers = utilXml.textBetweenMultipleXmlTags(xml, SUBOBJETOS[2]);
String xmlEducation = utilXml.textBetweenXmlTags(xml, SUBOBJETOS[3]);
if (!xmlFather.equals("")){
this.setFather(new Father(xmlFather));
if (!xmlMother.equals("")){
this.setMother(new Father(xmlMother));
if (!xmlBrothers.equals("")){
ArrayList aux = new ArrayList();
String xmlBrother;
while xmlBrothers != null && !xmlBrothers.equals("")){
xmlBrother = utilXml.textBetweenXmlTags(xmlBrothers, SUBOBJETOS[2]);
aux.add(new Brother(xmlBrother);
xmlBrothers = utilXml.removeTagTreated(xmlBrothers, SUBOBJETOS[2]);
this.setBrothers(aux);
if (!xmlEducation.equals("")){
this.setEducation(new Father(xmlEducation));
}If the object is a leaf object, the constructor will be like this:
public class Mother {
//Elements
private String name;
private String age;
public Mother(String xml){
XmlUtil utilXml = new XmlUtil();
HashMap objects = utilXml.parsearString(xml);
ArraysList objectsList = new ArrayList();
String[] Object = new String[2];
this.setName((String)objects.get("Mother"));
if (objects.get("attributes")!= null){
objectsList = objects.get("attributes");
for (int i = 0; i < objectsList.size();i++){
Object = objectsList.get(i);
if (object[0].equals("age"))
this.setAge(object[1]);
else
}Each class will have its getter and setter but I do not have implemented in the examples.
Finally, the parser is as follows:
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;
public class XmlUtil {
public HashMap parsearString(String contenido){
HashMap objet = new HashMap();
DocumentBuilderFactory factory;
DocumentBuilder builder;
Document document;
try{
if (content != null && !content.equals("")){
factory = DocumentBuilderFactory.newInstance();
builder = factory.newDocumentBuilder();
document = builder.parse(new ByteArrayInputStream(content.getBytes()));
object = visitNodes(document);
}else{
object = null;
} catch (ParserConfigurationException e) {
e.printStackTrace();
return null;
} catch (SAXException e) {
e.printStackTrace();
return null;
} catch (IOException e) {
e.printStackTrace();
return null;
return object;
private HashMap visitNodes (Node node){
String nodeName = "";
String nodeValue = "";
ArrayList attributes = new ArrayList();
HashMap object = new HashMap();
Node childNode = node.getFirstChild();
if (childNode.getNodeType() == Node.ELEMENT_NODE){
nodeName = childNode.getNodeName();
if (childNode.hasAttributes()){
attributes = visitAttributes(childNode.getAttributes());
}else{
attributes = null;
nodeValue = getNodeValue(childNode);
object.put(nodeName, nodeValue);
object.put("attributes", attributes);
return object;
private static String getNodeValue (Node node){
if (node.hasChildNodes() && node.getFirstChild().getNodeType() == Node.TEXT_NODE && !node.getFirstChild().getNodeValue().contains("\n\t"))
return node.getFirstChild().getNodeValue();
else
return "";
private ArrayList visitAttributes(NamedNodeMap attributes){
Node node;
ArrayList ListAttributes = new ArrayList();
String [] attribute = new String[2];
for(int i = 0; i < attributes.getLength(); i++){
atribute = new String[2];
node = attributes.item(i);
if (node.getNodeType() == Node.ATTRIBUTE_NODE){
attribute[0] = node.getNodeName();
attribute[1] = node.getNodeValue();
ListAttributes.add(attribute);
return ListAttributes;
}This code functioning properly. However, as exist around 400 objects to the xml, I wanted to create a method for more easily invoking objects that are below other and that's what I can't get to do at the moment.
The code I use is:
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class UtilClasses {
public Object UtilClasses(String package, String object, String xml){
try {
Class class = Class.forName(package + "." + object);
//parameter types for methods
Class[] partypes = new Class[]{Object.class};
//Create method object . methodname and parameter types
Method meth = class.getMethod(object, partypes);
//parameter types for constructor
Class[] constrpartypes = new Class[]{String.class};
//Create constructor object . parameter types
Constructor constr = claseObjeto.getConstructor(constrpartypes);
//create instance
Object obj = constr.newInstance(new String[]{xml});
//Arguments to be passed into method
Object[] arglist = new Object[]{xml};
//invoke method!!
String output = (String) meth.invoke(dummyto, arglist);
System.out.println(output);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
return null;
}This is an example obtained from the Internet that I've wanted modified to my needs. The problem is that when the class calls this method to invoke the constructor and does not fail, this does not do what I expect, because it creates an empty constructor. If not, the parent class gives a casting error.
I hope that now have been more clear my intentions and that no one has fallen asleep reading this lengthy explanation.
greetings. -
About the objects tranferred into the method?!
pls look@ the following code, why s1 and s1 still refer to different objects
even after they have assigned to the same by '='?
import java.util.Vector;
public class Test{
public static void main(String arg[]){
Vector s1=new Vector();
Vector s2=new Vector();
m(s1,s2);
System.out.println("s1 is "+s1+" s2 is "+s2);
System.out.println(s1==s2);
public static void m(Vector s1,Vector s2){
s1.add(new Integer(200));
s2.add(new Integer(100));
s1=s2;
}References (and, of course, primitive types) in java are passed by value. You can do anything you want with them in a method and they will still reference the same object after the method returns.
-
How to get the owning bean given a java object
Hi, is there any way - for a just-created bean instance - to know on behalf of which bean this object has been created ?
In other words, going back from the java object to the bean symbolic name, as described in a faces-config managed-bean chunk (just the opposite of resolveVariable) ?You want to get the definied managed bean name inside the backing bean?
If so, call this inside the backing bean: private String getManagedBeanName() {
String managedBeanName = null;
HttpServletRequest request =
(HttpServletRequest) FacesContext
.getCurrentInstance()
.getExternalContext()
.getRequest();
// Lookup bean in request scope.
Enumeration requestAttributeNames = request.getAttributeNames();
while (requestAttributeNames.hasMoreElements()) {
String requestAttribute = (String) requestAttributeNames.nextElement();
Object object = request.getAttribute(requestAttribute);
if (this.equals(object)) {
managedBeanName = requestAttribute;
break;
if (managedBeanName == null) {
// Bean is not in the request scope. Lookup it in session scope.
Enumeration sessionAttributeNames = request.getSession().getAttributeNames();
while (sessionAttributeNames.hasMoreElements()) {
String sessionAttribute = (String) sessionAttributeNames.nextElement();
Object object = request.getSession().getAttribute(sessionAttribute);
if (this.equals(object)) {
managedBeanName = sessionAttribute;
break;
return managedBeanName;
} -
Is it possible to create the memory for a Java object in C/C++?
Is it possible to have a C/C++ program allocate some memory, then have JNI use that memory for primitive java objects (such an array of bytes) that are passed to Java objects ?
I would like to allocate a region of memory in C++, then give that memory to a Java object (via some kind of JNI type) and have that Java object fill the memory region with data.
My impression from reading the JNI API and the few examples I've looked at is "No", there is a strict boundary between C++ and JNI as regards memory management. There may be serious implications as to why what I'm suggesting is not feasible, I am not enough of a JNI expert to know yet, and would greatly appreciate any input/comment.
Many thanks,
Colm.No, you cannot. However, writing your JNI code you should not use memory of Local Heap (if it possible). Because Local Heap Memory used also by JVM. I have developed tools that generate C++ wrappers for JNI code. In these wrappers I use mainly Global/Virtual Memory. I also reduce to minimum creation of local/global references, as it is affects to JVM memory use. If you are writing JNI code under MS Windows then you can try my tools that automate JNI code writing:
http://simtel.net/product.php[id]93174[SiteID]simtel.net
http://simtel.net/product.php[id]94368[SiteID]simtel.net
Now I am developing this tool for .Net. In two weeks it will be finished.
Maybe you are looking for
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