Inverse relationships silently failing with dual queries

Question

Now this is a really weird one. (2.2.3, 1.3.1_03, w2k)
I have some test code to do simple queries
public Project findProjectByName(String name) {
return (Project) findByName(Project.class, name);
public User findUserByName(String name) {
return (User) findByName(User.class, name);
private Object findByName(Class clazz, String name) {
Extent extent = pm.getExtent(clazz, true);
Query query = pm.newQuery(clazz, extent, "this.name == name");
query.declareParameters("String name");
Collection results = (Collection) query.execute(name);
if (results.size() != 1) {
throw new IllegalStateException("wrong result count " +
results.size() + " of " + clazz.getName() + ": " +
name);
Object result = results.iterator().next();
query.closeAll();
return result;
and some relationships defined
which has relationships defined as
<class name="Permission"/>
<class name="Project" requires-extent="true">
<field name="permissions">
<collection element-type="Permission"/>
<extension vendor-name="kodo" key="inverse"
value="project"/>
</field>
</class>
<class name="User" requires-extent="true">
<field name="permissions">
<collection element-type="Permission"/>
<extension vendor-name="kodo" key="inverse" value="user"/>
</field>
</class>
and some code which uses it.
Project itpap = findProjectByName("itpap");
User geoff = findUserByName("geoff");
System.out.println("itpap: permissions" + itpap.getPermissions());
System.out.println("geoff: permissions" + geoff.getPermissions());
Problem is, it prints out:
itpap: permissions[com.cisco.apit.itpap.model.Permission@6c6696,
com.cisco.apit.itpap.model.Permission@431340]
geoff: permissions[]
That is, the inverse relationship for the User object seems to be silently
failing.
So I tried reversing the order of the find methods, like so:
User geoff = mm.findUserByName("geoff");
Project itpap = mm.findProjectByName("itpap");
System.out.println("itpap: permissions" + itpap.getPermissions());
System.out.println("geoff: permissions" + geoff.getPermissions());
Same problem.
Then, I tried modifying it to:
Project itpap = findProjectByName("itpap");
System.out.println("itpap: permissions" + itpap.getPermissions());
User geoff = findUserByName("geoff");
System.out.println("geoff: permissions" + geoff.getPermissions());
And now it works fine, I get
itpap: permissions[com.cisco.apit.itpap.model.Permission@4247a0,
com.cisco.apit.itpap.model.Permission@6c6696]
geoff: permissions[com.cisco.apit.itpap.model.Permission@2bb7e0,
com.cisco.apit.itpap.model.Permission@6c6696]
How weird is that? It seems like the syptoms would be best descibed by "if
you query for two objects separately, then navigating to a related object
from one of the queried objects breaks any subsequent attempted navigation
to a related objects for the other".
Cheers
Geoff

Answer 1

Hi Geoff,
Check out my posts on "2.2.3GA Transparent Navigation of two-way one-to-one relationship failing"
(March 9th and following.) Sounds like we may be looking at the same bug. I don't know if this has
been fixed in 2.2.4.
David
Geoff Soutter wrote:
>
Now this is a really weird one. (2.2.3, 1.3.1_03, w2k)
I have some test code to do simple queries
public Project findProjectByName(String name) {
return (Project) findByName(Project.class, name);
public User findUserByName(String name) {
return (User) findByName(User.class, name);
private Object findByName(Class clazz, String name) {
Extent extent = pm.getExtent(clazz, true);
Query query = pm.newQuery(clazz, extent, "this.name == name");
query.declareParameters("String name");
Collection results = (Collection) query.execute(name);
if (results.size() != 1) {
throw new IllegalStateException("wrong result count " +
results.size() + " of " + clazz.getName() + ": " +
name);
Object result = results.iterator().next();
query.closeAll();
return result;
and some relationships defined
which has relationships defined as
<class name="Permission"/>
<class name="Project" requires-extent="true">
<field name="permissions">
<collection element-type="Permission"/>
<extension vendor-name="kodo" key="inverse"
value="project"/>
</field>
</class>
<class name="User" requires-extent="true">
<field name="permissions">
<collection element-type="Permission"/>
<extension vendor-name="kodo" key="inverse" value="user"/>
</field>
</class>
and some code which uses it.
Project itpap = findProjectByName("itpap");
User geoff = findUserByName("geoff");
System.out.println("itpap: permissions" + itpap.getPermissions());
System.out.println("geoff: permissions" + geoff.getPermissions());
Problem is, it prints out:
itpap: permissions[com.cisco.apit.itpap.model.Permission@6c6696,
com.cisco.apit.itpap.model.Permission@431340]
geoff: permissions[]
That is, the inverse relationship for the User object seems to be silently
failing.
So I tried reversing the order of the find methods, like so:
User geoff = mm.findUserByName("geoff");
Project itpap = mm.findProjectByName("itpap");
System.out.println("itpap: permissions" + itpap.getPermissions());
System.out.println("geoff: permissions" + geoff.getPermissions());
Same problem.
Then, I tried modifying it to:
Project itpap = findProjectByName("itpap");
System.out.println("itpap: permissions" + itpap.getPermissions());
User geoff = findUserByName("geoff");
System.out.println("geoff: permissions" + geoff.getPermissions());
And now it works fine, I get
itpap: permissions[com.cisco.apit.itpap.model.Permission@4247a0,
com.cisco.apit.itpap.model.Permission@6c6696]
geoff: permissions[com.cisco.apit.itpap.model.Permission@2bb7e0,
com.cisco.apit.itpap.model.Permission@6c6696]
How weird is that? It seems like the syptoms would be best descibed by "if
you query for two objects separately, then navigating to a related object
from one of the queried objects breaks any subsequent attempted navigation
to a related objects for the other".
Cheers
Geoff