*help* my XMLEncoder.writeObject isn't doing all fields
4 Message(s) by 2 Author(s) originally posted in java beans
| From: timasmith |
Date: Thursday, June 22, 2006
|
I've a regular
class , implements serializable, private variables with
getter/setter.
Nothing prints - despite being populated - ahhh driving me nuts
The plot thickens when I use hardcoded
string s to set the properties
i.e. instead of cp.getUserName() I used "username"
If I put println in the
method it proves there is
data ...
public void saveConnection(ConnProperty cp)
ConnProperty conn = new ConnProperty();
conn.setUsername(cp.getUserName());
conn.setDriverClass(cp.getDriver());
conn.setPassword(cp.getPassword);
conn.setUrl(cp.getUrl());
ConnectionList.setConfigFileName("test.xml");
ConnectionList
list =new ConnectionList();
list.add(conn);
SerializeUtility.serializeXML(new File(
file name),
list.
element s());
public static void serializeXML(File file, Enumeration e1) throws
IOException {
XML Encoder
encoder = null;
try
{
encoder = new XMLEncoder(
new BufferedOutputStream(
new FileOutputStream(file)));
while (e1.hasMoreElements()) {
encoder.
write Object(e1.nextElement());
}
} catch (Exception ex) {
Debug.LogException("SerializeUtility", ex);
}
finally
{
if (encoder != null) {
encoder.close();
}
}
}
package com.osframework.datalibrary.common;
import JAVA.io.Serializable;
public class ConnProperty implements Serializable {
private static final long serialVersionUID = 0L;
/**
* False for
Microsoft Access , True for almost all other databases.
*/
private boolean
connect ToURL = true;
/**
*
URL to connect to remote database (or Microsoft Access local file)
* e.g. jdbc:oracle:thin:@xxxxxxxxxxx:1521:prod1
*/
private String url = "jdbc:odbc:DRIVER={Microsoft Access Driver
(*.mdb)};DBQ=osrmt.mdb";
/**
* Driver implementation - class name - must be in the classpath!
*/
private String
driver Class = "sun.jdbc.odbc.JdbcOdbcDriver";
/**
* Database connections of the same
environment name
* will access URLs in this order
*/
private
int accessSequence = 0;
private String username = "admin";
private String
password = "";
public int getAccessSequence() {
return accessSequence;
}
public void setAccessSequence(int accessSequence) {
this.accessSequence = accessSequence;
}
public boolean isConnectToURL() {
return connectToURL;
}
public void setConnectToURL(boolean connectToURL) {
this.connectToURL = connectToURL;
}
public String getDriverClass() {
return driverClass;
}
public void setDriverClass(String driverClass) {
this.driverClass = driverClass;
} public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
| From: Chris Riesbeck |
Date: Thursday, June 22, 2006
|
Not sure when you say "nothing prints" if you mean the file is empty, or
has an empty XML element. The former
implies I/O error -- any errors in
your log? The latter can be a number of things.
But here are some points to consider.
First, this is not
real test
code since it calls getDriver() instead of
getDriverClass(). Always post the real code you ran.
Second, I do not think you can write more than one
object . The
output is
a
complete XML
root and only one root is allowed per file. If you want
the file to contain a list of ConnProperty objects, just write the list
itself. The Encoder will
dump the list in XML and all it's parts. Very
neat and simple. No
loop on your part.
Third, why are you copying the object before serializing? Just curious.
Fourth, do not forget that if your object only has default data, nothing
will be written except an element representing that there is such an
object. That's because the encoder does not write any data that the
default
constructor can take care of. So a default object isn't a good
test case.
Hope this helps.
wrote in message:
I have a regular class, implements serializable, private variables with
getter/setter.
Nothing prints - despite being populated - ahhh driving me nuts
The plot thickens when I use hardcoded strings to set the properties
i.e. instead of cp.getUserName() I used "username"
If I put println in the method it proves there is data...
public void saveConnection(ConnProperty cp)
ConnProperty conn = new ConnProperty();
conn.setUsername(cp.getUserName());
conn.setDriverClass(cp.getDriver());
conn.setPassword(cp.getPassword);
conn.setUrl(cp.getUrl());
ConnectionList.setConfigFileName("test.xml");
ConnectionList list =new ConnectionList();
list.add(conn);
SerializeUtility.serializeXML(new File(filename),
list.elements());
public static void serializeXML(File file, Enumeration e1) throws
IOException {
XMLEncoder encoder = null;
try
{
encoder = new XMLEncoder(
new BufferedOutputStream(
new FileOutputStream(file)));
while (e1.hasMoreElements()) {
encoder.writeObject(e1.nextElement());
}
} catch (Exception ex) {
Debug.LogException("SerializeUtility", ex);
}
finally
{
if (encoder != null) {
encoder.close();
}
}
}
package com.osframework.datalibrary.common;
import JAVA.io.Serializable;
public class ConnProperty implements Serializable {
private static final long serialVersionUID = 0L;
/**
* False for Microsoft Access, True for almost all other databases.
*/
private boolean connectToURL = true;
/**
* URL to connect to remote database (or Microsoft Access local file)
* e.g. jdbc:oracle:thin:@xxxxxxxxxxx:1521:prod1
*/
private String url = "jdbc:odbc:DRIVER={Microsoft Access Driver
(*.mdb)};DBQ=osrmt.mdb";
/**
* Driver implementation - class name - must be in the classpath!
*/
private String driverClass = "sun.jdbc.odbc.JdbcOdbcDriver";
/**
* Database connections of the same environment name
* will access URLs in this order
*/
private int accessSequence = 0;
private String username = "admin";
private String password = "";
public int getAccessSequence() {
return accessSequence;
}
public void setAccessSequence(int accessSequence) {
this.accessSequence = accessSequence;
}
public boolean isConnectToURL() {
return connectToURL;
}
public void setConnectToURL(boolean connectToURL) {
this.connectToURL = connectToURL;
}
public String getDriverClass() {
return driverClass;
}
public void setDriverClass(String driverClass) {
this.driverClass = driverClass;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
| From: timasmith |
Date: Thursday, June 22, 2006
|
ooooohhhhhh mannnn
I have been banging my head against the
wall for 3 hours - and all the
time it doesnt write it because my private variables are initialized to
that value????
Well I say that is absurd ... so I persist the object to XML, later
change the default value of my *private* variables - and later
XML-->Object = wrong values
icky
Obviously the
workaround is initiliaze nothing but integers and
boolean.
anyway - THANKS!
wrote in message:
Not sure when you say "nothing prints" if you mean the file is empty, or
has an empty XML element. The former implies I/O error -- any errors in
your log? The latter can be a number of things.
But here are some points to consider.
First, this is not real test code since it calls getDriver() instead of
getDriverClass(). Always post the real code you ran.
Second, I do not think you can write more than one object. The output is
a complete XML root and only one root is allowed per file. If you want
the file to contain a list of ConnProperty objects, just write the list
itself. The Encoder will dump the list in XML and all it's parts. Very
neat and simple. No loop on your part.
Third, why are you copying the object before serializing? Just curious.
Fourth, do not forget that if your object only has default data, nothing
will be written except an element representing that there is such an
object. That's because the encoder does not write any data that the
default constructor can take care of. So a default object isn't a good
test case.
Hope this helps.
wrote in message:
> I've a regular class, implements serializable, private variables with
> getter/setter.
>
> Nothing prints - despite being populated - ahhh driving me nuts
>
> The plot thickens when I use hardcoded strings to set the properties
> i.e. instead of cp.getUserName() I used "username"
>
> If I put println in the method it proves there is data...
>
> public void saveConnection(ConnProperty cp)
> ConnProperty conn = new ConnProperty();
> conn.setUsername(cp.getUserName());
> conn.setDriverClass(cp.getDriver());
> conn.setPassword(cp.getPassword);
> conn.setUrl(cp.getUrl());
> ConnectionList.setConfigFileName("test.xml");
> ConnectionList list =new ConnectionList();
> list.add(conn);
> SerializeUtility.serializeXML(new File(filename),
> list.elements());
>
> public static void serializeXML(File file, Enumeration e1) throws
> IOException {
> XMLEncoder encoder = null;
> try
> {
> encoder = new XMLEncoder(
> new BufferedOutputStream(
> new FileOutputStream(file)));
> while (e1.hasMoreElements()) {
> encoder.writeObject(e1.nextElement());
> }
> } catch (Exception ex) {
> Debug.LogException("SerializeUtility", ex);
> }
> finally
> {
> if (encoder != null) {
> encoder.close();
> }
> }
> }
>
>
>
> package com.osframework.datalibrary.common;
>
> import JAVA.io.Serializable;
>
> public class ConnProperty implements Serializable {
>
> private static final long serialVersionUID = 0L;
> /**
> * False for Microsoft Access, True for almost all other databases.
> */
> private boolean connectToURL = true;
>
> /**
> * URL to connect to remote database (or Microsoft Access local file)
> * e.g. jdbc:oracle:thin:@xxxxxxxxxxx:1521:prod1
> */
> private String url = "jdbc:odbc:DRIVER={Microsoft Access Driver
> (*.mdb)};DBQ=osrmt.mdb";
>
> /**
> * Driver implementation - class name - must be in the classpath!
> */
> private String driverClass = "sun.jdbc.odbc.JdbcOdbcDriver";
>
> /**
> * Database connections of the same environment name
> * will access URLs in this order
> */
> private int accessSequence = 0;
>
> private String username = "admin";
>
> private String password = "";
>
> public int getAccessSequence() {
> return accessSequence;
> }
>
> public void setAccessSequence(int accessSequence) {
> this.accessSequence = accessSequence;
> }
>
>
>
> public boolean isConnectToURL() {
> return connectToURL;
> }
>
> public void setConnectToURL(boolean connectToURL) {
> this.connectToURL = connectToURL;
> }
>
> public String getDriverClass() {
> return driverClass;
> }
>
> public void setDriverClass(String driverClass) {
> this.driverClass = driverClass;
> }
>
>
> public String getPassword() {
> return password;
> }
>
> public void setPassword(String password) {
> this.password = password;
> }
>
> public String getUrl() {
> return url;
> }
>
> public void setUrl(String url) {
> this.url = url;
> }
>
> public String getUsername() {
> return username;
> }
>
> public void setUsername(String username) {
> this.username = username;
> }
>
>
>
> }
>
| From: Chris Riesbeck |
Date: Friday, June 23, 2006
|
wrote in message:
ooooohhhhhh mannnn
I have been banging my head against the wall for 3 hours - and all the
time it doesnt write it because my private variables are initialized to
that value????
Well I say that is absurd ... so I persist the object to XML, later
change the default value of my *private* variables - and later
XML-->Object = wrong values
icky
Design trade-off. The
API (application
programming interface)says it uses a "redundancy elimination
algorithm," which is summarized in 2 sentences at
http://JAVA.sun.com/products/jfc/tsc/articles/persistence4/#intro
The
goal is to reduce how much is read and written.
There are lots of ways changing your class could
break things later on
when decoding, so they may have felt it was a lost cause trying to
prevent that.