Strange Problem with changing a CMP-Field

[neitzel1]

Hi everybody,

I got a strange problem and don't know, where my mistake could be:

I build up a entity Bean with a Container baased persitence field:

public abstract Map getAttributes();
public abstract void setAttributes(Map attribs);

In the create-routine, I am puting a map inside that field or - if the given argument is null, I put there a new java.util.HashMap();

I am adding Attributes there, so I build up a function inside the bean:

public void setAttribute(String key, String obj) {
Map m = getAttributes();
if (m==null) {
m = new HashMap();
setAttributes(m); // could be left away
}
m.put(key,obj);
setAttributes(m);
}

In ejbStore() and ejbLoad() I am just printing the contents of the stored map.

Now I got this strange behavior:
- initialisation works fine. I can give a Map with Attributes. For Example, I can give him the Attributes "testkey" -> "TestObject"

When I am changing a keys, I get:

Adding Key "a1" -> "a1obj"
ejbLoad:
"testkey" -> "TestObject"
ejbStore:
"testkey" -> "TestObject"
"a1" -> "a1obj"

This seems good, but now I am adding "b1" -> "b1obj"
ejbLoad:
"testkey" -> "TestObject"
ejbStore:
"testkey" -> "TestObject"
"b1" -> "b1obj"

So the stored Key "a1" -> "a1obj" is missing!

When I am changing the Key:
ejbLoad:
"testkey" -> "TestObject"
ejbStore:
"testkey" -> "changed"

But when I am queriing the Attributes I got:
"testkey" -> "TestObject"
instead of
"testkey" -> "changed"
again!

Where can be my mistake? I am using
jboss 3.0.4 with MySQL, I build up the datasource as shown in the jca-Example. Adding new Entities works fine. The initial values are stored as they should be, but I cannot change the Attributes!

Maybe somebody could give me a clue, what I can do to fix this.

With kind regards,

Konrad

[neitzel1]

I think I got the solution.

When I am changing the map (by adding / deleting / changing entries in the map), the map still is the same when looking from outside.

So I think, that JBoss just checks, if the map has changed and thinks, that the map isn't changed. So the changed map isn't stored inside the database.

My Solution:

Map newMap = new HashMap();
if (getAttriutes() != null) {
newMap.putAll(getAttributes());
}
// Doing the changes
setAttributes(newMap);

With this code, JBoss sees, that there is a new Map now and the data is stored inside the database.

With kind regards,

Konrad