On 2014-04-24, 8:05 AM, "David Avendasora" wrote:
Lack of good code hygiene beyond pretty formatting has now bit me.
I should have had the following like a real developer:
protected static ERXEnterpriseObjectCache<Airport> cacheByPrimaryKey = null;
protected static ERXEnterpriseObjectCache<Airport> cacheByPrimaryKey() {
If (cacheByPrimaryKey == null) {
// could add some double checked locking here if you want
cacheByPrimaryKey = new ERXEnterpriseObjectCache<Airport>(Airport.ENTITY_NAME,
"primaryKey",
// Cache Key
null,
// qualifier
300000L,
// timeout - 0=never
true,
// shouldRetainObjects
true,
// shouldFetchInitialValues
false);
// shouldReturnUnsavedObjects
}
return cacheByPrimaryKey;
}
:-P
true, // shouldFetchInitialValues
This does a fetch, which requires EOF to be fully setup. That is not a good
thing to do in a static init block. But I guess that is obvious now.
Chuck
On 2014-04-24, 8:05 AM, "David Avendasora" wrote:
This is now biting me.
I have the following:
public static ERXEnterpriseObjectCache<Airport> cacheByPrimaryKey = new
ERXEnterpriseObjectCache<Airport>(Airport.ENTITY_NAME,
"primaryKey", // Cache Key
null, // qualifier
300000L, // timeout - 0=never
true, // shouldRetainObjects
true, // shouldFetchInitialValues
false); // shouldReturnUnsavedObjects
Which is tripping the same bug.
Why, oh why, does SQL generation need to initialize the EO’s class?? Shouldn’t
the EOClassDescription or EOGenericRecord be enough? I don’t see what getting
the actual class accomplishes, other than make SQL Generation more fragile. If
ERXEnterpriseObjectCache breaks it, what else can?
Yes, I’m second-guessing Mike Schrag. (Hi Mike)
So, Mike, is this something that is possible to change (yes, I know it would be
on me to do it - be afraid) or is there something about how the sql generation
works that requires more than the Entity itself?
Thanks,
Dave
On Oct 26, 2011, at 5:19 PM, Chuck Hill
<[email protected]<mailto:[email protected]>> wrote:
The fundamental issue is that ERXEnterpriseObjectCache is intended to be used
in a Wonder application, where those properties are read and used. Generating
SQL only loads the classes, it does not run in the context of a running WO
application.
You probably DO want to retain the objects, you just don't want to initialize
this in a static block. Use lazy initialization so that the class can load
without setting up the cache.
Chuck
On 2011-10-26, at 2:16 PM, Issam Maamria wrote:
Thanks Chuck for the pointer.
The issue was in a static initialiser that executes the following line in its
call trace:
new ERXEnterpriseObjectCache<XXX>(entityName, XXX.NAME_KEY, null,
CACHE_TIMEOUT, true, false, false);
I changed the argument 'shouldRetainObjects''s value from true to false, and it
did the trick.
However, I do not fully understand what was the fundamental issue!
Regards
Issam
On 26 October 2011 19:26, Chuck Hill
<[email protected]<mailto:[email protected]>> wrote:
Hi Issam,
It is a bad idea to do anything in the constructor of an EO, which I assume is
what is happening here:
at
er.extensions.eof.ERXEnterpriseObjectCache.setRetainObjects(ERXEnterpriseObjectCache.java:789)
at
er.extensions.eof.ERXEnterpriseObjectCache.<init>(ERXEnterpriseObjectCache.java:201)
at indoc.app.common.IDStaticTag.tagCacheForEntity(IDStaticTag.java:75)
at indoc.app.common.IDStaticTag.<init>(IDStaticTag.java:61)
at indoc.app.entities.Content.<clinit>(Content.java:39)
This can often cause EOF problems. A better choice is to use lazy
initialization.
http://en.wikipedia.org/wiki/Lazy_initialization
Chuck
On 2011-10-26, at 11:00 AM, Issam Maamria wrote:
Hi all,
Thank you very much for the pointers. They, however, were not the cause of the
problem.
An interesting thing is that the following exception always happens before the
one I mentioned before.
I have the following lines in my properties file:
# EOF
er.extensions.ERXEC.safeLocking=true
er.extensions.ERXEC.useSharedEditingContext=false
er.extensions.ERXEC.markOpenLocks = false
er.extensions.ERXEC.traceOpenLocks = false
er.extensions.ERXEnterpriseObject.applyRestrictingQualifierOnInsert=true
er.extensions.ERXEnterpriseObject.updateInverseRelationships=true
The trace is :
java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at
com.webobjects.foundation._NSUtilities._classWithPartialName(_NSUtilities.java:348)
at
com.webobjects.foundation._NSUtilities.classWithName(_NSUtilities.java:335)
at
com.webobjects.eoaccess.EOModel._setEntityForEntityNameClassName(EOModel.java:1299)
at
com.webobjects.eoaccess.EOModel._addFakeEntityWithPropertyList(EOModel.java:1337)
at
com.webobjects.eoaccess.EOModel._initWithTableOfContentsPropertyListPathURL(EOModel.java:1141)
at com.webobjects.eoaccess.EOModel.<init>(EOModel.java:838)
at
com.webobjects.eoaccess.EOModelGroup.addModelWithPathURL(EOModelGroup.java:443)
at
org.objectstyle.wolips.eomodeler.core.sql.EOFSQLGenerator53.<init>(EOFSQLGenerator53.java:121)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at
org.objectstyle.wolips.eomodeler.core.sql.EOFSQLGeneratorFactory.sqlGenerator(EOFSQLGeneratorFactory.java:43)
at
org.objectstyle.wolips.eomodeler.actions.GenerateSQLDialog.generateSql(GenerateSQLDialog.java:297)
at
org.objectstyle.wolips.eomodeler.actions.GenerateSQLDialog$1.run(GenerateSQLDialog.java:279)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.RuntimeException: ERXEnterpriseObjectCache requires
automatic locking when objects are retained. Set
er.extensions.ERXEC.defaultAutomaticLockUnlock or
er.extensions.ERXEC.safeLocking in your Properties file
at
er.extensions.eof.ERXEnterpriseObjectCache.setRetainObjects(ERXEnterpriseObjectCache.java:789)
at
er.extensions.eof.ERXEnterpriseObjectCache.<init>(ERXEnterpriseObjectCache.java:201)
at indoc.app.common.IDStaticTag.tagCacheForEntity(IDStaticTag.java:75)
at indoc.app.common.IDStaticTag.<init>(IDStaticTag.java:61)
at indoc.app.entities.Content.<clinit>(Content.java:39)
... 18 more
Regards
Issam
On 26 October 2011 16:51, Chuck Hill
<[email protected]<mailto:[email protected]>> wrote:
static initialization blocks can also cause problems for SQL generation - check
that they are not throwing exceptions.
On 2011-10-26, at 7:15 AM, John Huss wrote:
The classes that you declare for you entities must be reachable from the
project where the model is located, usually in the same project.
On Wed, Oct 26, 2011 at 6:19 AM, Issam Maamria
<[email protected]<mailto:[email protected]>> wrote:
Hi all,
I have an issue with SQL generation from an EOModel. The thing is it sometimes
works (this happens randomly), and most of the time comes up with an error:
java.lang.NoClassDefFoundError: Could not initialize class XXXXXXXX
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at
com.webobjects.foundation._NSUtilities._classWithPartialName(_NSUtilities.java:348)
at
com.webobjects.foundation._NSUtilities.classWithName(_NSUtilities.java:335)
at
com.webobjects.eoaccess.EOModel._setEntityForEntityNameClassName(EOModel.java:1299)
at
com.webobjects.eoaccess.EOModel._addFakeEntityWithPropertyList(EOModel.java:1337)
at
com.webobjects.eoaccess.EOModel._initWithTableOfContentsPropertyListPathURL(EOModel.java:1141)
at com.webobjects.eoaccess.EOModel.<init>(EOModel.java:838)
at
com.webobjects.eoaccess.EOModelGroup.addModelWithPathURL(EOModelGroup.java:443)
at
org.objectstyle.wolips.eomodeler.core.sql.EOFSQLGenerator53.<init>(EOFSQLGenerator53.java:121)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at
org.objectstyle.wolips.eomodeler.core.sql.EOFSQLGeneratorFactory.sqlGenerator(EOFSQLGeneratorFactory.java:43)
at
org.objectstyle.wolips.eomodeler.actions.GenerateSQLDialog.generateSql(GenerateSQLDialog.java:297)
at
org.objectstyle.wolips.eomodeler.actions.GenerateSQLDialog$1.run(GenerateSQLDialog.java:279)
at java.lang.Thread.run(Thread.java:680)
SQL generation is a GREAT feature, and it is frustrating that I cannot get it
to work on a consistent basis.
Regards
Issam
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demand for specialized networking skills is growing even more rapidly.
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Practical WebObjects - for developers who want to increase their overall
knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects
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WebObjects - so easy that even Dave Avendasora can do it!™
—————————————————————————————
David Avendasora
Senior Software Abuser
Nekesto, Inc.
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