[Middlegen-user] Issue: defined Primitive types versus Objects (CMP20 plugin)

[Darren Hartford]

Hey all,
This was a kicker to find. Have a database, it contains a Numeric field that is NULLable. Use CMP to connect to a J2EE application but get NullPointer exceptions during execution.

Instead of defining the Numeric as a java.lang.Integer object in the Entity Bean, it was defined as an 'int'.
public abstract int getMyNumberField();
public abstract void setMyNumberField(int myNumberField);

Is there a way to quickly fix this (outside of changing the generated source code), Then a gameplan to take care of it in the future? I know on the J2EE/CMP side you 99% always want Objects in the EntityBean, not sure on JDO side though. Thanks, I'm suprised no one else has run into this!

-D

[Russell Simpkins]

You can always edit the velocity template(s).

-----Original Message-----
From: middlegen-user-***@lists.sourceforge.net
[mailto:middlegen-user-***@lists.sourceforge.net] On Behalf Of Darren
Hartford
Sent: Monday, December 22, 2003 11:03 AM
To: middlegen-***@lists.sourceforge.net
Subject: [Middlegen-user] Issue: defined Primitive types versus Objects
(CMP20 plugin)

Hey all,
This was a kicker to find. Have a database, it contains a Numeric field
that is NULLable. Use CMP to connect to a J2EE application but get
NullPointer exceptions during execution.

Instead of defining the Numeric as a java.lang.Integer object in the
Entity Bean, it was defined as an 'int'.
public abstract int getMyNumberField();
public abstract void setMyNumberField(int myNumberField);

Is there a way to quickly fix this (outside of changing the generated
source code), Then a gameplan to take care of it in the future? I know
on the J2EE/CMP side you 99% always want Objects in the EntityBean, not
sure on JDO side though. Thanks, I'm suprised no one else has run into
this!

-D


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[Rod Macpherson]

<cmp20 destination="${build.source}" blah blah blah...>
<fileproducer id="entity-cmp-20"
template="./template/entity-cmp-20.vm"/>
<jboss/>
<weblogic/>
</cmp20>

You can make a copy of entity-cmp-20.vm in your own folder (template in
this example) and edit it to your heart's content. Now you control the
output. As far as mapping types, however, there is a source for
middlegen.javax.Sql2Java.java that you can modify and rebuild middlgen.
Say you wanted Types.NUMERIC to translate as Double objects:

_preferredJavaTypeForSqlType.put(Types.NUMERIC,
"java.lang.Double");

Not sure if editing that source is recommended, however.

-----Original Message-----
From: Russell Simpkins [mailto:***@hotmail.com]
Sent: Monday, December 22, 2003 8:20 AM
To: middlegen-***@lists.sourceforge.net
Subject: RE: [Middlegen-user] Issue: defined Primitive types versus
Objects (CMP20 plugin)


You can always edit the velocity template(s).

-----Original Message-----
From: middlegen-user-***@lists.sourceforge.net
[mailto:middlegen-user-***@lists.sourceforge.net] On Behalf Of Darren
Hartford
Sent: Monday, December 22, 2003 11:03 AM
To: middlegen-***@lists.sourceforge.net
Subject: [Middlegen-user] Issue: defined Primitive types versus Objects
(CMP20 plugin)

Hey all,
This was a kicker to find. Have a database, it contains a Numeric field
that is NULLable. Use CMP to connect to a J2EE application but get
NullPointer exceptions during execution.

Instead of defining the Numeric as a java.lang.Integer object in the
Entity Bean, it was defined as an 'int'. public abstract int
getMyNumberField(); public abstract void setMyNumberField(int
myNumberField);

Is there a way to quickly fix this (outside of changing the generated
source code), Then a gameplan to take care of it in the future? I know
on the J2EE/CMP side you 99% always want Objects in the EntityBean, not
sure on JDO side though. Thanks, I'm suprised no one else has run into
this!

-D


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[Darren Hartford]

Sent in a patch for CVS HEAD (12/23/2003).
http://sourceforge.net/tracker/index.php?func=detail&aid=865006&group_id=36044&atid=415992
Simply related to adding in a check to make the JAVA TYPE an Object for nullable fields - was originally only PK/FK. Hopefully someone will look at this and allow an option to have all JAVA TYPES be Objects for CMP20 for those that wish it.
-D

From: Russell Simpkins [mailto:***@hotmail.com]=20
Subject: RE: [Middlegen-user] Issue: defined Primitive types versus
Objects (CMP20 plugin)


You can always edit the velocity template(s).

-----Original Message-----
From: middlegen-user-***@lists.sourceforge.net
[mailto:middlegen-user-***@lists.sourceforge.net] On Behalf Of Darren
Hartford
Sent: Monday, December 22, 2003 11:03 AM
To: middlegen-***@lists.sourceforge.net
Subject: [Middlegen-user] Issue: defined Primitive types versus Objects
(CMP20 plugin)

Hey all,
This was a kicker to find. Have a database, it contains a Numeric field
that is NULLable. Use CMP to connect to a J2EE application but get
NullPointer exceptions during execution.

Instead of defining the Numeric as a java.lang.Integer object in the
Entity Bean, it was defined as an 'int'. public abstract int
getMyNumberField(); public abstract void setMyNumberField(int
myNumberField);

Is there a way to quickly fix this (outside of changing the generated
source code), Then a gameplan to take care of it in the future? I know
on the J2EE/CMP side you 99% always want Objects in the EntityBean, not
sure on JDO side though. Thanks, I'm suprised no one else has run into
this!

-D