very, very serious problem - null values where objects should be

From: Tomi NA (hefes..mail.com)
Date: Mon Jun 05 2006 - 05:33:49 EDT

  • Next message: Marcin Skladaniec: "Re: very, very serious problem - null values where objects should be"

    I see very disturbing behaviour and while I'm not certain cayenne is
    to blame, maybe someone could shed a little light on the subject.
    First of all, I'm using 1.2RC1 - inherited the .xml files from
    previous versions of 1.2.

    I experience what appears to be random null objects in the object
    graph. At the moment, I'm debugging the app and am looking at the
    following one-to-many relationship...
    I have an object myObject whose getToObjectCategory() method should
    give me the category of myObject - the method returns null.
    In the database (pgsql 8.1.3), I can see that the category is intact -
    no problem there. Looking at the myObject state, I can see that it's
    persistenceState is set to 3 - so this is not a modification that
    happened in memory - I believe the state would be 4 in that case.
    What's more, I have a drop-down menu in the GUI where the seemingly
    missing object category is present.

    A bit of information about my envinomnent...
    I'm the only user connected to the database, my app is the only app
    accessing the data and no (intentional) data modification takes place.
    I generate regular subclasses and custom superclasses (listed bellow)
    - the only customization is the addition of change monitoring code (so
    that I can bind the beans to my GUI via jgoodies binding).

    This is a major problem - I don't know where to start with it... :-(

    t.n.a.

    #if( ${classGen.isUsingPackage()} )
    package ${classGen.packageName};

    #end
    #if( ${classGen.isContainingDeclaredListProperties()} )
    import java.util.List;

    #end
    /** Class ${classGen.superPrefix}${classGen.className} was generated by Cayenne.
      * It is probably a good idea to avoid changing this class manually,
      * since it may be overwritten next time code is regenerated.
      * If you need to make any customizations, please use subclass.
      */
    public class ${classGen.superPrefix}${classGen.className} extends
    $classGen.superClassName {

    // CUSTOM CODE
        private java.beans.PropertyChangeSupport propertyChangeSupport =
    new java.beans.PropertyChangeSupport(this);

    ## Create property names
    #foreach( $attr in ${classGen.Entity.DeclaredAttributes} )
    #set( $classGen.Prop = $attr.Name )## let controller know about current property
        public static final String ${classGen.propAsConstantName}_PROPERTY
    = "${attr.Name}";
    #end
    #foreach( $rel in ${classGen.Entity.DeclaredRelationships} )
    #set( $classGen.Prop = $rel.Name )## let controller know about current property
        public static final String ${classGen.propAsConstantName}_PROPERTY
    = "${rel.Name}";
    #end

    #if( $classGen.Entity.DbEntity )
    #foreach( $idAttr in ${classGen.Entity.DbEntity.PrimaryKey} )
    #set( $classGen.Prop = $idAttr.Name )## let controller know about
    current property
        public static final String
    ${classGen.propAsConstantName}_PK_COLUMN = "${idAttr.Name}";
    #end
    #end

        // CUSTOM CODE
        public void addPropertyChangeListener(java.beans.PropertyChangeListener l) {
            propertyChangeSupport.addPropertyChangeListener(l);
        }

        public void
    removePropertyChangeListener(java.beans.PropertyChangeListener l) {
            propertyChangeSupport.removePropertyChangeListener(l);
        }

    ## Create attribute set/get methods
    #foreach( $attr in ${classGen.Entity.DeclaredAttributes} )
    #set( $classGen.Prop = $attr.Name )## let controller know about current property
    #if ("true" != "${classGen.getEntity().isReadOnly()}")
        public void
    set${classGen.cappedProp}($classGen.formatJavaType(${attr.Type})
    $classGen.formatVariableName(${attr.Name})) {
            // CUSTOM CODE
            $classGen.formatJavaType(${attr.Type}) staro_${attr.Name} =
    ($classGen.formatJavaType(${attr.Type}))readProperty("${attr.Name}");

            writeProperty("${attr.Name}",
    $classGen.formatVariableName(${attr.Name}));
            // CUSTOM CODE
            propertyChangeSupport.firePropertyChange ("${attr.Name}",
    staro_${attr.Name}, ${attr.Name});
        }
    #end
        public $classGen.formatJavaType(${attr.Type}) get${classGen.cappedProp}() {
            return ($classGen.formatJavaType(${attr.Type}))readProperty("${attr.Name}");
        }

    #end
    ##
    ## Create list add/remove/get methods
    #foreach( $rel in ${classGen.Entity.DeclaredRelationships} )
    #set( $classGen.Prop = $rel.Name )## let controller know about current property
    #if( $rel.ToMany )
    #if ( ! $rel.ReadOnly )
        public void
    addTo${classGen.cappedProp}($classGen.formatJavaType(${rel.TargetEntity.ClassName})
    obj) {
            addToManyTarget("${rel.name}", obj, true);
        }
        public void
    removeFrom${classGen.cappedProp}($classGen.formatJavaType(${rel.TargetEntity.ClassName})
    obj) {
            removeToManyTarget("${rel.name}", obj, true);
        }
    #end
        public List get${classGen.cappedProp}() {
            return (List)readProperty("${rel.name}");
        }
    #else
    #if ( !${classGen.getEntity().isReadOnly()} && !$rel.ReadOnly )
        public void
    set${classGen.cappedProp}($classGen.formatJavaType(${rel.TargetEntity.ClassName})
    $classGen.formatVariableName(${rel.name})) {
                // SHOULD ADD CUSTOM CODE, TODO
            setToOneTarget("${rel.name}",
    $classGen.formatVariableName(${rel.name}), true);
        }
    #end

        public $classGen.formatJavaType(${rel.TargetEntity.ClassName})
    get${classGen.cappedProp}() {
            return ($classGen.formatJavaType(${rel.TargetEntity.ClassName}))readProperty("${rel.name}");
        }
    #end

    #end
    }

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