XMl and Java object mapping

I need to map java objects with XMl Node or XML Elements.
My java objets get some attributes, for instance name,color ...
and i need an output like:
<OBJECT_OF_TYPE_XXX>
<NAME>scott</NAME>
<COLOR>red</COLOR>
</OBJECT_OF_TYPE_XXX>
Any idea?
Thanks
Maurice

You can try JAXB which includes a compiler that generates classes based on the XML Schema for your xml structure. It also features the possibility to convert between xml and the generated objects.
Take a look at chapter 9 and 10 at http://java.sun.com/webservices/docs/1.1/tutorial/doc/index.html

Similar Messages

Explicity mapping between ActionScript and Java objects for the BlazeDS Messaging Service

The BlazeDS documentation shows how to explicitly map between ActionScript and Java objects. For example, this works fine for RPC services, e.g.
import flash.utils.IExternalizable;
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;
        public function writeExternal(output : IDataOutput) : void {
                output.writeObject(id);
and
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
public class User implements Externalizable {
    protected String id;
    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();
    public void writeExternal(ObjectOutput out) throws IOException {
        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?
MessageBroker messageBroker = MessageBroker.getMessageBroker(null);
AsyncMessage message = new AsyncMessage();
message.setDestination("MyMessagingService");
message.setClientId(UUIDUtils.createUUID());
message.setMessageId(UUIDUtils.createUUID());
User user = new User();
user.setId("id");
user.setSecret("secret");
message.setBody(user);
messageBroker.routeMessageToService(message, null);

Hi Martin. The way that AMF serialization/deserialization works for BlazeDS is the same regardless of which service is being used, so yes that code will work for messaging as well. On the server, the serialization/deserialization of messages happens at the endpoint. For an incoming message for example, the endpoint deserializes the message and then hands it off to the MessageBroker which decides which service/destination to deliver the message to.
That was a good question. Thanks for asking it. Lots of people are used to doing custom serialization/deserialization with the RPC services (RemoteObject/RemotingService) but I'm not sure everyone realizes they can do this for messaging as well.
-Alex

JAXB and inheritance. Converting xml to java object

I have a schema "FreeStyle.xsd" i used JAXB to generate POJO's . I get around 15 classes. I have a config.xml which is compliant to this schema . Now i want to write a java program which takes the config.xml and converts it into a java object . Please anybody help me with this . Thanks in advance
Freestyle.xsd
<?xml version="1.0" encoding="windows-1252"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="FreeStyleProject" type="hudson.model.FreeStyleProject"/>
<xsd:complexType name="hudson.model.FreeStyleProject">
<xsd:complexContent>
   <xsd:extension base="hudson.model.Project">
    <xsd:sequence/>
   </xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="hudson.model.Project">
<xsd:complexContent>
   <xsd:extension base="hudson.model.BaseBuildableProject">
    <xsd:sequence/>
   </xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="hudson.model.BaseBuildableProject">
<xsd:complexContent>
   <xsd:extension base="hudson.model.AbstractProject">
    <xsd:sequence/>
   </xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="hudson.model.AbstractProject">
<xsd:complexContent>
   <xsd:extension base="hudson.model.Job">
    <xsd:sequence>
     <xsd:element name="concurrentBuild" type="xsd:boolean"/>
     <xsd:element name="downstreamProject" type="hudson.model.AbstractProject"
                  minOccurs="0" maxOccurs="unbounded"/>
     <xsd:element name="scm" type="hudson.scm.SCM" minOccurs="0"/>
     <xsd:element name="upstreamProject" type="hudson.model.AbstractProject"
                  minOccurs="0" maxOccurs="unbounded"/>
    </xsd:sequence>
   </xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="hudson.scm.SCM">
<xsd:sequence>
   <xsd:element name="browser" type="hudson.scm.RepositoryBrowser"
                minOccurs="0"/>
   <xsd:element name="type" type="xsd:string" minOccurs="0"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="hudson.scm.RepositoryBrowser">
<xsd:sequence/>
</xsd:complexType>
<xsd:complexType name="hudson.model.Job">
<xsd:complexContent>
   <xsd:extension base="hudson.model.AbstractItem">
    <xsd:sequence>
     <xsd:element name="buildable" type="xsd:boolean"/>
     <xsd:element name="build" type="hudson.model.Run" minOccurs="0"
                  maxOccurs="unbounded"/>
     <xsd:element name="cascadingChildrenName" type="xsd:string" minOccurs="0"
                  maxOccurs="unbounded"/>
     <xsd:element name="color" type="hudson.model.BallColor" minOccurs="0"/>
     <xsd:element name="firstBuild" type="hudson.model.Run" minOccurs="0"/>
     <xsd:element name="healthReport" type="hudson.model.HealthReport"
                  minOccurs="0" maxOccurs="unbounded"/>
     <xsd:element name="inQueue" type="xsd:boolean"/>
     <xsd:element name="keepDependencies" type="xsd:boolean"/>
     <xsd:element name="lastBuild" type="hudson.model.Run" minOccurs="0"/>
     <xsd:element name="lastCompletedBuild" type="hudson.model.Run"
                  minOccurs="0"/>
     <xsd:element name="lastFailedBuild" type="hudson.model.Run" minOccurs="0"/>
     <xsd:element name="lastStableBuild" type="hudson.model.Run" minOccurs="0"/>
     <xsd:element name="lastSuccessfulBuild" type="hudson.model.Run"
                  minOccurs="0"/>
     <xsd:element name="lastUnstableBuild" type="hudson.model.Run"
                  minOccurs="0"/>
     <xsd:element name="lastUnsuccessfulBuild" type="hudson.model.Run"
                  minOccurs="0"/>
     <xsd:element name="nextBuildNumber" type="xsd:int"/>
     <xsd:element name="property" type="hudson.model.JobProperty" minOccurs="0"
                  maxOccurs="unbounded"/>
     <xsd:element name="queueItem" type="hudson.model.Queue-Item"
                  minOccurs="0"/>
    </xsd:sequence>
   </xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="hudson.model.Queue-Item">
<xsd:complexContent>
   <xsd:extension base="hudson.model.Actionable">
    <xsd:sequence>
     <xsd:element name="blocked" type="xsd:boolean"/>
     <xsd:element name="buildable" type="xsd:boolean"/>
     <xsd:element name="id" type="xsd:int">
      <xsd:annotation>
       <xsd:documentation>VM-wide unique ID that tracks the {@link Task} as it
                          moves through different stages in the queue (each
                          represented by different subtypes of {@link Item}.</xsd:documentation>
      </xsd:annotation>
     </xsd:element>
     <xsd:element name="inQueueSince" type="xsd:long"/>
     <xsd:element name="params" type="xsd:string" minOccurs="0"/>
     <xsd:element name="stuck" type="xsd:boolean"/>
     <xsd:element name="task" type="xsd:anyType" minOccurs="0">
      <xsd:annotation>
       <xsd:documentation>Project to be built.</xsd:documentation>
      </xsd:annotation>
     </xsd:element>
     <xsd:element name="why" type="xsd:string" minOccurs="0"/>
    </xsd:sequence>
   </xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="hudson.model.Actionable">
<xsd:sequence>
   <xsd:element name="action" type="xsd:anyType" minOccurs="0"
                maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="hudson.model.JobProperty">
<xsd:sequence/>
</xsd:complexType>
<xsd:complexType name="hudson.model.HealthReport">
<xsd:sequence>
   <xsd:element name="description" type="xsd:string" minOccurs="0"/>
   <xsd:element name="iconUrl" type="xsd:string" minOccurs="0"/>
   <xsd:element name="score" type="xsd:int"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="hudson.model.Run">
<xsd:complexContent>
   <xsd:extension base="hudson.model.Actionable">
    <xsd:sequence>
     <xsd:element name="artifact" type="hudson.model.Run-Artifact" minOccurs="0"
                  maxOccurs="unbounded"/>
     <xsd:element name="building" type="xsd:boolean"/>
     <xsd:element name="description" type="xsd:string" minOccurs="0"/>
     <xsd:element name="duration" type="xsd:long"/>
     <xsd:element name="fullDisplayName" type="xsd:string" minOccurs="0"/>
     <xsd:element name="id" type="xsd:string" minOccurs="0"/>
     <xsd:element name="keepLog" type="xsd:boolean"/>
     <xsd:element name="number" type="xsd:int"/>
     <xsd:element name="result" type="xsd:anyType" minOccurs="0"/>
     <xsd:element name="timestamp" type="xsd:long" minOccurs="0"/>
     <xsd:element name="url" type="xsd:string" minOccurs="0"/>
    </xsd:sequence>
   </xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="hudson.model.Run-Artifact">
<xsd:sequence>
   <xsd:element name="displayPath" type="xsd:string" minOccurs="0"/>
   <xsd:element name="fileName" type="xsd:string" minOccurs="0"/>
   <xsd:element name="relativePath" type="xsd:string" minOccurs="0">
    <xsd:annotation>
     <xsd:documentation>Relative path name from {@link Run#getArtifactsDir()}</xsd:documentation>
    </xsd:annotation>
   </xsd:element>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="hudson.model.AbstractItem">
<xsd:complexContent>
   <xsd:extension base="hudson.model.Actionable">
    <xsd:sequence>
     <xsd:element name="description" type="xsd:string" minOccurs="0"/>
     <xsd:element name="displayName" type="xsd:string" minOccurs="0"/>
     <xsd:element name="name" type="xsd:string" minOccurs="0"/>
     <xsd:element name="url" type="xsd:string" minOccurs="0"/>
    </xsd:sequence>
   </xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:simpleType name="hudson.model.BallColor">
<xsd:restriction base="xsd:string">
   <xsd:enumeration value="red"/>
   <xsd:enumeration value="red_anime"/>
   <xsd:enumeration value="yellow"/>
   <xsd:enumeration value="yellow_anime"/>
   <xsd:enumeration value="green"/>
   <xsd:enumeration value="green_anime"/>
   <xsd:enumeration value="blue"/>
   <xsd:enumeration value="blue_anime"/>
   <xsd:enumeration value="grey"/>
   <xsd:enumeration value="grey_anime"/>
   <xsd:enumeration value="disabled"/>
   <xsd:enumeration value="disabled_anime"/>
   <xsd:enumeration value="aborted"/>
   <xsd:enumeration value="aborted_anime"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:schema>
Config.xml
<?xml version='1.0' encoding='UTF-8'?>
<project>
<actions/>
<description>Sample job ..</description>
<project-properties class="java.util.concurrent.ConcurrentHashMap">
    <entry>
      <string>hudson-plugins-disk_usage-DiskUsageProperty</string>
      <base-property>
        <originalValue class="hudson.plugins.disk_usage.DiskUsageProperty"/>
        <propertyOverridden>false</propertyOverridden>
      </base-property>
    </entry>
    <entry>
      <string>jdk</string>
      <string-property>
        <originalValue class="string">(Inherit From Job)</originalValue>
        <propertyOverridden>false</propertyOverridden>
      </string-property>
    </entry>
    <entry>
      <string>scm</string>
      <scm-property>
        <originalValue class="hudson.scm.NullSCM"/>
        <propertyOverridden>false</propertyOverridden>
      </scm-property>
    </entry>
</project-properties>
<keepDependencies>false</keepDependencies>
<creationTime>1402648240275</creationTime>
<properties/>
<cascadingChildrenNames class="java.util.concurrent.CopyOnWriteArraySet"/>
<cascading-job-properties class="java.util.concurrent.CopyOnWriteArraySet">
    <string>hudson-plugins-batch_task-BatchTaskProperty</string>
    <string>hudson-plugins-disk_usage-DiskUsageProperty</string>
    <string>hudson-plugins-jira-JiraProjectProperty</string>
    <string>org-hudsonci-plugins-snapshotmonitor-WatchedDependenciesProperty</string>
    <string>hudson-plugins-promoted_builds-JobPropertyImpl</string>
</cascading-job-properties>
<scm class="hudson.scm.NullSCM"/>
<canRoam>false</canRoam>
<disabled>false</disabled>
<blockBuildWhenDownstreamBuilding>false</blockBuildWhenDownstreamBuilding>
<blockBuildWhenUpstreamBuilding>false</blockBuildWhenUpstreamBuilding>
<concurrentBuild>false</concurrentBuild>
<cleanWorkspaceRequired>false</cleanWorkspaceRequired>
</project>
the file generated by JAXB are
com\model\HudsonModelAbstractItem.java
com\model\HudsonModelAbstractProject.java
com\model\HudsonModelActionable.java
com\model\HudsonModelBallColor.java
com\model\HudsonModelBaseBuildableProject.java
com\model\HudsonModelFreeStyleProject.java
com\model\HudsonModelHealthReport.java
com\model\HudsonModelJob.java
com\model\HudsonModelJobProperty.java
com\model\HudsonModelProject.java
com\model\HudsonModelQueueItem.java
com\model\HudsonModelRun.java
com\model\HudsonModelRunArtifact.java
com\model\HudsonScmRepositoryBrowser.java
com\model\HudsonScmSCM.java
com\model\ObjectFactory.java
Any help will be appreciated .
Thanks in advance

Unmarshal the config.xml to Java object.
Basic JAXB Examples - The Java EE 5 Tutorial

XML to java object AND Performance

Hi,
I read some article about marshalling a XML file to Java Object (like Castor, XML Beans projects...)
To resume: I would like to marshal a XML doc (from XML to Java object. Later I would like to put these objects on a SGBD...). Unfortenaly I suppose that approach is to expensive on term of performance? Supposing that my xml doc contain 100 data's occurances, XML bean woulkd create 100 objects corresponding. My problem is that I don't want that the all 100 objects live in the same time on memory. For example, my code will read sequential, the xml occurances (like a Sax parser), create 10 datas objects (standby), put these in the data base, and destroy these objects before...iteratively create the next 10 objects...
It is possible ? Can anybody help me?
Thank

On the article: Java Architecture for XML Binding (JAXB)
(http://java.sun.com/developer/technicalArticles/WebServices/jaxb/)
I found maybe a response?
"...in other words, you can do a SAX parse of a document and then pass the events to JAXB for unmarshalling. "
But somebody could help me to write the code to do that?

How to parse XML to Java object... please help really stuck

Thank you for reading this email...
If I have a **DTD** like:
<!ELEMENT person (name, age)>
<!ATTLIST person
     id ID #REQUIRED
>
<!ELEMENT name ((family, given) | (given, family))>
<!ELEMENT age (#PCDATA)>
<!ELEMENT family (#PCDATA)>
<!ELEMENT given (#PCDATA)>
the **XML** like:
<person id="a1">
<name>
     <family> Yoshi </family>
     <given> Samurai </given>
</name>
<age> 21 </age>
</person>
**** Could you help me to write a simple parser to parse my DTD and XML to Java object, and how can I use those objects... sorry if the problem is too basic, I am a beginner and very stuck... I am very confuse with SAXParserFactory, SAXParser, ParserAdapter and DOM has its own Factory and Parser, so confuse...
Thank you for your help, Yo

Hi, Yo,
Thank you very much for your help. And I Wish you are there...I'm. And I plan to stay - It's sunny and warm here in Honolulu and the waves are up :)
A bit more question for dear people:
In the notes, it's mainly focus on JAXB,
1. Is that mean JAXB is most popular parser for
parsing XML into Java object? With me, definitely. There are essentially 3 technologies that allow you to parse XML documents:
1) "Callbacks" (e.g. SAX in JAXP): You write a class that overrides 3 methods that will be called i) whenever the parser encounters a start tag, ii) an end tag, or iii) PCDATA. Drawback: You have to figure out where the heck in the document hierarchy you are when such a callback happens, because the same method is called on EACH start tag and similarly for the end tag and the PCDATA. You have to create the objects and put them into your own data structure - it's very tedious, but you have complete control. (Well, more or less.)
2) "Tree" (e.g. DOM in JAXP, or it's better cousin JDOM): You call a parser that in one swoop creates an entire hierarchy that corresponds to the XML document. You don't get called on each tag as with SAX, you just get the root of the resulting tree. Drawback: All the nodes in the tree have the same type! You probably want to know which tags are in the document, don't you? Well, you'll have to traverse the tree and ask each node: What tag do you represent? And what are your attributes? (You get only strings in response even though your attributes often represent numbers.) Unless you want to display the tree - that's a nice application, you can do it as a tree model for JTree -, or otherwise don't care about the individual tags, DOM is not of much help, because you have to keep track where in the tree you are while you traverse it.
3) Enter JAXB (or Castor, or ...): You give it a grammar of the XML documents you want to parse, or "unmarshall" as the fashion dictates to call it. (Actually the name isn't that bad, because "parsing" focuses on the input text while "unmarshalling" focuses on the objects you get, even though I'd reason that it should be marshalling that converts into objects and unmarshalling that converts objects to something else, and not vice versa but that's just my opinion.) The JAXB compiler creates a bunch of source files each with one (or now more) class(es) (and now interfaces) that correspond to the elements/tags of your grammar. (Now "compiler" is a true jevel of a misnomer, try to explain to students that after they run the "compiler", they still need to compile the sources the "compiler" generated with the real Java compiler!). Ok, you've got these sources compiled. Now you call one single method, unmarshall() and as a result you get the root node of the hierarchy that corresponds to the XML document. Sounds like DOM, but it's much better - the objects in the resulting tree don't have all the same type, but their type depends on the tag they represent. E.g if there is the tag <ball-game> then there will be an object of type myPackage.BallGame in your data structure. It gets better, if there is <score> inside <ball-game> and you have an object ballGame (of type BallGame) that you can simply call ballGame.getScore() and you get an object of type myPackage.Score. In other words, the child tags become properties of the parent object. Even better, the attributes become properties, too, so as far as your program is concerned there is no difference whether the property value was originally a tag or an attribute. On top of that, you can tell in your schema that the property has an int value - or another primitive type (that's like that in 1.0, in the early release you'll have to do it in the additional xjs file). So this is a very natural way to explore the data structure of the XML document. Of course there are drawbacks, but they are minor: daunting complexity and, as a consequence, very steep learning curve, documentation that leaves much to reader's phantasy - read trial and error - (the user's guide is too simplicistic and the examples too primitive, e.g. they don't even tell you how to make a schema where a tag has only attributes) and reference manual that has ~200 pages full of technicalities and you have to look with magnifying glas for the really usefull stuff, huge number of generated classes, some of which you may not need at all (and in 1.0 the number has doubled because each class has an accompanying interface), etc., etc. But overall, all that pales compared to the drastically improved efficiency of the programmer's efforts, i.e. your time. The time you'll spend learning the intricacies is well spent, you'll learn it once and then it will shorten your programming time all the time you use it. It's like C and Java, Java is order of magnitude more complex, but you'd probably never be sorry you gave up C.
Of course the above essay leaves out lots and lots of detail, but I think that it touches the most important points.
A word about JAXB 1.0 vs. Early Release (EA) version. If you have time, definitively learn 1.0, they are quite different and the main advantage is that the schema combines all the info that you had to formulate in the DTD and in the xjs file when using the EA version. I suggested EA was because you had a DTD already, but in retrospect, you better start from scratch with 1.0. The concepts in 1.0 are here to stay and once your surmounted the learning curve, you'll be glad that you don't have to switch concepts.
When parser job is done,
what kind of Java Object we will get? (String,
InputStream or ...)See above, typically it's an object whose type is defined as a class (and interface in 1.0) within the sources that JABX generates. Or it can be a String or one of the primitive types - you tell the "compiler" in the schema (xjs file in EA) what you want!
2. If we want to use JAXB, we have to contain a
XJS-file? Something like:In EA, yes. In 1.0 no - it's all in the schema.
I am very new to XML, is there any simpler way to get
around them? It has already take me 4 days to find a
simple parser which give it XML and DTD, then return
to me Java objects ... I mean if that kind of parser
exists....It'll take you probably magnitude longer that that to get really familiar with JAXB, but believe me it's worth it. You'll save countless days if not weeks once you'll start developing serious software with it. How long did it take you to learn Java and it's main APIs? You'll either invest the time learning how to use the software others have written, or you invest it writing it yourself. I'll take the former any time. But it's only my opinion...
Jan

Convert MBox into XML into Java Objects

Hello all,
this is a general question, i dont know weather there is such libs or not.
However, please tell me what you know.
i want to program a java application for searching purpose in Mbox.
i thought its possible and easier to try to convert the emails from the MBox into XML files, and from these create java objects when i need or even convert the XML into html for viewing.
Any suggestions are welcome.
Also antoher solutions are greate.
thanks in advance!
Sako.

I don't know what this MBox you speak of is - I assume it's not the thing I use to hook upa guitar to GarageBand. Maybe you mean it as a generic term for mailbox? The easiest solution (to my mind) would be to use a Java API provided by whatever MBox is. If there is no such thing, then if you get XML-formatted version of the messages I suppose writing code to parse the XML into Java Objects would be a good option if you wanted to do further manipulation of them, but if all you want to do is display them as HTML in a browser then just use XSLT to transform them.
Good Luck
Lee

NEW TO XML AND JAVA

hi, I'm new to xml, actually I'm taking a course in xml and I should choose a certain project related to xml.
I want to ask about xml and java
the things that I know about java is some classes ( I made a program of bouncing ball in java and changed some java game programs). but I need to know how to use java in databases and how to relate it to xml
Is it too dificult or I can learn it knowing that I'm ready to learn and already I'm learning xml.
If anyone wants to help me please send me links to some websites where it is simple to learn java .
Also if any one can give me an example of a certain project that can be done easily using java and xml u'll be more than welcome

Check the JAVA XML Tutorials provided by the Java Site.

XML to Java Objects

Hi,
In our existing project we are using JDK / JRE 1.3.
We need to add a module wherein we need to pick up an XML object (from MQ) and convert it into a Java Object.
I was initially planning to use JAXP, but it appears that it needs Java 1.4 (or above). Is it ? So what is the other option available ?
Is JDOM a worthwhile alternative ? Would it be supported on Java 1.3?or any other suitable alternative.
Kindly advice as need to finalize on this as soon as possible.
Thanks,
MD

You may have to roll your own - last time I was working with 1.3 there wasn't anything out there for it, but that was a couple of years ago.
If the schema is fixed, you can pull parse, otherwise use SAX, a LinkedList as a stack and a map of element name -> content handler to populate the objects. If it's not a performance bottleneck*, you can get a long way just using reflection rather than having to write specific handling code for each attribute.
Pete
*most of what I do is aerospace simulation, so our messages might say 'run 100,000 simulations that cover all of the flight envelope', which then spawns a 15,000 cpu hour process, so it's at the opposite extreme to something like a SMS service hub, where there's almost no processing and it's all parsing, so optimising the XML for performance for us is irrelevent.

Need Expert Advice regarding oracle and java objects

In our project, we are submitting data for many screens at a time. Some screens will have a list of records to be submitted. There is also some hierarchy among the data up to 4 levels.
In such a scenario, we need to know the best way to exchange data between Oracle and Java. Currently java holds the data as objects, where each object may contain an array of next level of objects in it.
Is it best approach to pass the entire data with hierarchy to Oracle using nested table approach and internally oracle handling the data? Is there any other way to do this?
Also in some scenarios we need to pass the entire information for all the screens in one shot with the hierarchy. So we need to know a solution for that also. Could you please help us in this regard?

See Oracle JPublisher technique to map Oracle object types to Java ones:
http://download-west.oracle.com/docs/cd/B10501_01/java.920/a96658/toc.htm
Rgds

XML and Java

I am new in using xml in java, can any one tell me how to call XML file in java and how to read from it .
Regards
rajin

Look at the XML chapters of the J2EE 1.4 Tutorial:
http://java.sun.com/j2ee/1.4/docs/tutorial/doc/index.html
-Ian Evans

I'd like to load images using XML and Java - hints??

I have a XML files that are created on a timed basis....they describe a photo and point to a dir where the photo is stored...like...
<image>
<user>bill</user>
<img>photo.jpg</img>
<img_dir>'/tmp/photos'</img_dir>
</image>
I'd like to write a Java program that parses the XML and loads the images, data into Oracle.
Suggestions on Oracle tools, downloads that will help me accomplish this???
Thanks!

I pass a URL and then when I parse the XML I download the file from the URL.
A.

Converting XML to Java Objects...possible?

Hi, Am a newbie to JAXB. As far as I read, JAXB has facility to convert "XSD" (not XML) to Java "classes" (not objects). This can be done using xjc compiler. Can XML files (i.e. ones with data) be converted to Java objects (retaining the data from XML files)? If yes, please throw some light on how it can be done. If no, then is there some java technology to do such a thing?
Thanks.

http://xmlbeans.apache.org/

Xml to java object

Hi
What is an easy way to generate an java object from xml
Thanks very much

Using DOM or JDOM (http://xml.apache.org/xerces-j/, http://www.jdom.org/)
It is equaly as easy to create a dom or a jdom obj, but most java programmers find JDOM more intuative to work with.
Hope this helps!

New to XML - what can XML and java do thogether - brief examples please

I am new to XML and relatively new to Java, thought not new to programming. I am still trying to figure out what can XML do for me in practical terms and when I should use it. Thanks for any examples of when to use XML in conjunction with Java.

xml : Think of it in terms of business solutions, the way you would think of HTML for drawing fun web-pages.
java : If you know anything about databases you would know you can embed java with sql E.T.C.
Therefore because of the fast response times and the amount of constant interaction for business purposes you will need a database type that is strong to handle XML, therefore with such new technology you will be able to use xml databases with java too.
l am sorry : XML Technology is not more simple than that to explain.
If you are a christian or jew it is like saying to someone explain the bible,the prophets,the old and new testament in one sentence!!!You get it.What one can do is slightly break-up the bible and say there's an old and new testament.The old testament refers to the time before Jesus, AND the new testament refers to After Jesus, THE PROPHETS RELATE MORE TO THE TIME BEFORE Jesus.
You can then ask me who is jesus???
And thats a tricky question in its self becuse it depends on one's thinking(concept)
I HOPE IT HELPS YOU !!!!
GOD DAY MATE!!

Toplink JPA and Java type mapping

Hi there,
I'm struggling wit mapping an existing database using Toplink Essentials.
Specifically: I have an INT SQL field which I want to map as boolean/Boolean in my entity class.
How to do this? Either in standard JPA or with some Toplink extensions?
Markus

Hi Markus,
The JPA spec doesn't cover conversion/transformation but you can do it with TopLink Essentials using a Converter. I have an example pasted below that uses a converter to map between a database VARCHAR value and a pre-Java 5 enum (i.e., a hand coded enum-type class that runs in Java 1.4).
I use a descriptor customizer to get hold of the Basic mapping (in TopLink a "DirectToFieldMapping") and then plug in a converter.
--Shaun
Persistence.xml:
<property
   name="toplink.descriptor.customizer.TypeWriter"
   value="oracle.toplink.essentials.emf.examples.library.orm.TypeWriterCustomizer"/>The customizer:
public class TypeWriterCustomizer implements DescriptorCustomizer {
      * Add customizer to translate between Enum and value.
     public void customize(ClassDescriptor descriptor) throws Exception {
          DirectToFieldMapping typeMapping = (DirectToFieldMapping) descriptor.getMappingForAttributeName("type");
          Converter typeWriterEnumConverter = TypeWriterEnumConverter.getInstance();
          typeMapping.setConverter(typeWriterEnumConverter);
}The actual converter class:
* TypeWriterEnumConverter is a singleton since it has no state.
public class TypeWriterEnumConverter implements Converter {
     protected static TypeWriterEnumConverter instance = new TypeWriterEnumConverter();
     private TypeWriterEnumConverter() {}
     public static TypeWriterEnumConverter getInstance() {
          return instance;
     public Object convertDataValueToObjectValue(Object data, Session session) {
          String typeName = (String)data;
          return TWriterType.get(typeName);
     public Object convertObjectValueToDataValue(Object object, Session session) {
          TWriterType type = (TWriterType) object;
          if (type != null) {
               return type.getName();
          } else {
               return null;
     public void initialize(DatabaseMapping arg0, Session arg1) {}
     public boolean isMutable() {
          return false;
}

XMl and Java object mapping

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