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improve some error reporting and add some code comments

This commit is contained in:
Gavin 2022-12-26 13:10:49 +01:00 committed by Gavin King
parent d886c56228
commit dda88668e8
4 changed files with 98 additions and 57 deletions
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120
hibernate-core/src/main/java/org/hibernate/boot/model/internal/EntityBinder.java
View File

@ -105,7 +105,6 @@ import jakarta.persistence.AttributeOverrides;
import jakarta.persistence.Cacheable;
import jakarta.persistence.ConstraintMode;
import jakarta.persistence.DiscriminatorColumn;
import jakarta.persistence.DiscriminatorType;
import jakarta.persistence.DiscriminatorValue;
import jakarta.persistence.Entity;
import jakarta.persistence.IdClass;
@ -143,7 +142,7 @@ import static org.hibernate.mapping.SimpleValue.DEFAULT_ID_GEN_STRATEGY;
/**
* Stateful holder and processor for binding Entity information
* Stateful holder and processor for binding information about an {@link Entity} class.
*
* @author Emmanuel Bernard
*/
@ -784,65 +783,80 @@ public class EntityBinder {
final DiscriminatorFormula discriminatorFormula =
getOverridableAnnotation( annotatedClass, DiscriminatorFormula.class, context );
final boolean isRoot = !inheritanceState.hasParents();
final AnnotatedDiscriminatorColumn discriminator = isRoot
? buildDiscriminatorColumn( discriminatorColumn, discriminatorFormula, context )
: null;
if ( discriminatorColumn != null && !isRoot ) {
//TODO: shouldn't this be an error?!
LOG.invalidDiscriminatorAnnotation( annotatedClass.getName() );
if ( !inheritanceState.hasParents() ) {
return buildDiscriminatorColumn( discriminatorColumn, discriminatorFormula, context );
}
else {
// not a root entity
if ( discriminatorColumn != null ) {
throw new AnnotationException( "Entity class '" + annotatedClass.getName()
+ "' is annotated '@DiscriminatorColumn' but it is not the root of the entity inheritance hierarchy");
}
if ( discriminatorFormula != null ) {
throw new AnnotationException( "Entity class '" + annotatedClass.getName()
+ "' is annotated '@DiscriminatorFormula' but it is not the root of the entity inheritance hierarchy");
}
return null;
}
return discriminator;
}
/**
* Process all discriminator-related metadata per rules for "joined" inheritance
* Process all discriminator-related metadata per rules for "joined" inheritance, taking
* into account {@value AvailableSettings#IMPLICIT_DISCRIMINATOR_COLUMNS_FOR_JOINED_SUBCLASS}
* and {@value AvailableSettings#IGNORE_EXPLICIT_DISCRIMINATOR_COLUMNS_FOR_JOINED_SUBCLASS}.
*/
private AnnotatedDiscriminatorColumn processJoinedDiscriminatorProperties(InheritanceState inheritanceState) {
if ( annotatedClass.isAnnotationPresent( DiscriminatorFormula.class ) ) {
throw new MappingException( "@DiscriminatorFormula on joined inheritance not supported at this time" );
throw new AnnotationException( "Entity class '" + annotatedClass.getName()
+ "' has 'JOINED' inheritance and is annotated '@DiscriminatorFormula'" );
}
final DiscriminatorColumn discriminatorColumn = annotatedClass.getAnnotation( DiscriminatorColumn.class );
if ( !inheritanceState.hasParents() ) {
// we want to process the discriminator column if either:
// 1) There is an explicit DiscriminatorColumn annotation && we are not told to ignore them
// 2) There is not an explicit DiscriminatorColumn annotation && we are told to create them implicitly
final boolean generateDiscriminatorColumn;
if ( discriminatorColumn != null ) {
generateDiscriminatorColumn = !context.getBuildingOptions().ignoreExplicitDiscriminatorsForJoinedInheritance();
if ( generateDiscriminatorColumn ) {
LOG.applyingExplicitDiscriminatorColumnForJoined(
annotatedClass.getName(),
AvailableSettings.IGNORE_EXPLICIT_DISCRIMINATOR_COLUMNS_FOR_JOINED_SUBCLASS
);
}
else {
LOG.debugf( "Ignoring explicit DiscriminatorColumn annotation on: %s", annotatedClass.getName() );
}
}
else {
generateDiscriminatorColumn = context.getBuildingOptions().createImplicitDiscriminatorsForJoinedInheritance();
if ( generateDiscriminatorColumn ) {
LOG.debug( "Applying implicit DiscriminatorColumn using DiscriminatorColumn defaults" );
}
else {
LOG.debug( "Ignoring implicit (absent) DiscriminatorColumn" );
}
}
if ( generateDiscriminatorColumn ) {
return buildDiscriminatorColumn( discriminatorColumn, null, context );
}
return useDiscriminatorColumnForJoined( discriminatorColumn )
? buildDiscriminatorColumn( discriminatorColumn, null, context )
: null;
}
else {
// not a root entity
if ( discriminatorColumn != null ) {
LOG.invalidDiscriminatorAnnotation( annotatedClass.getName() );
throw new AnnotationException( "Entity class '" + annotatedClass.getName()
+ "' is annotated '@DiscriminatorColumn' but it is not the root of the entity inheritance hierarchy");
}
return null;
}
}
return null;
/**
* We want to process the discriminator column if either:
* <ol>
* <li>there is an explicit {@link DiscriminatorColumn} annotation and we are not told to ignore it
* via {@value AvailableSettings#IGNORE_EXPLICIT_DISCRIMINATOR_COLUMNS_FOR_JOINED_SUBCLASS}, or
* <li>there is no explicit {@link DiscriminatorColumn} annotation but we are told to create it
* implicitly via {@value AvailableSettings#IMPLICIT_DISCRIMINATOR_COLUMNS_FOR_JOINED_SUBCLASS}.
* </ol>
*/
private boolean useDiscriminatorColumnForJoined(DiscriminatorColumn discriminatorColumn) {
if ( discriminatorColumn != null ) {
boolean ignore = context.getBuildingOptions().ignoreExplicitDiscriminatorsForJoinedInheritance();
if ( ignore ) {
LOG.debugf( "Ignoring explicit @DiscriminatorColumn annotation on: %s", annotatedClass.getName() );
}
else {
LOG.applyingExplicitDiscriminatorColumnForJoined(
annotatedClass.getName(),
AvailableSettings.IGNORE_EXPLICIT_DISCRIMINATOR_COLUMNS_FOR_JOINED_SUBCLASS
);
}
return !ignore;
}
else {
boolean createImplicit = context.getBuildingOptions().createImplicitDiscriminatorsForJoinedInheritance();
if ( createImplicit ) {
LOG.debugf( "Inferring implicit @DiscriminatorColumn using defaults for: %s", annotatedClass.getName() );
}
return createImplicit;
}
}
private void processIdPropertiesIfNotAlready(
@ -1017,17 +1031,18 @@ public class EntityBinder {
}
/**
* For the most part, this is a simple delegation to {@link PersistentClass#isPropertyDefinedInHierarchy},
* after verifying that PersistentClass is indeed set here.
* Delegates to {@link PersistentClass#isPropertyDefinedInHierarchy},
* after verifying that there is a {@link PersistentClass} available.
*
* @param name The name of the property to check
*
* @return {@code true} if a property by that given name does already exist in the super hierarchy.
*/
public boolean isPropertyDefinedInSuperHierarchy(String name) {
// Yes, yes... persistentClass can be null because EntityBinder can be used
// to bind components as well, of course...
return persistentClass != null && persistentClass.isPropertyDefinedInSuperHierarchy( name );
// Yes, yes... persistentClass can be null because EntityBinder
// can be used to bind Components (naturally!)
return persistentClass != null
&& persistentClass.isPropertyDefinedInSuperHierarchy( name );
}
private void bindRowManagement() {
@ -1061,7 +1076,8 @@ public class EntityBinder {
}
public boolean isRootEntity() {
// This is the best option I can think of here since PersistentClass is most likely not yet fully populated
// This is the best option I can think of here since
// PersistentClass is most likely not yet fully populated
return persistentClass instanceof RootClass;
}
@ -1145,7 +1161,7 @@ public class EntityBinder {
private void bindCustomSql() {
//SQL overriding
//TODO: tolerate non-empty table() member here
//TODO: tolerate non-empty table() member here if it explicitly names the main table
final SQLInsert sqlInsert = findMatchingSqlAnnotation( "", SQLInsert.class, SQLInserts.class );
if ( sqlInsert != null ) {
@ -1245,7 +1261,7 @@ public class EntityBinder {
Class clazz = persisterAnn.impl();
if ( !EntityPersister.class.isAssignableFrom(clazz) ) {
throw new AnnotationException( "Persister class '" + clazz.getName()
+ "' does not implement EntityPersister" );
+ "' does not implement 'EntityPersister'" );
}
persistentClass.setEntityPersisterClass( clazz );
}

6
hibernate-core/src/main/java/org/hibernate/cfg/AvailableSettings.java
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@ -687,6 +687,9 @@ public interface AvailableSettings {
* the JPA defined defaults for these absent annotations.
* <p>
* See Hibernate Jira issue HHH-6911 for additional background info.
* <p>
* This setting defaults to {@code false}, meaning that implicit discriminator columns
* are never inferred to exist for joined inheritance hierarchies.
*
* @see org.hibernate.boot.MetadataBuilder#enableImplicitDiscriminatorsForJoinedSubclassSupport
* @see #IGNORE_EXPLICIT_DISCRIMINATOR_COLUMNS_FOR_JOINED_SUBCLASS
@ -706,6 +709,9 @@ public interface AvailableSettings {
* inheritance.
* <p>
* See Hibernate Jira issue HHH-6911 for additional background info.
* <p>
* This setting defaults to {@code false}, meaning that explicit discriminator columns
* are never ignored.
*
* @see org.hibernate.boot.MetadataBuilder#enableExplicitDiscriminatorsForJoinedSubclassSupport
* @see #IMPLICIT_DISCRIMINATOR_COLUMNS_FOR_JOINED_SUBCLASS

23
hibernate-core/src/main/java/org/hibernate/mapping/RootClass.java
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@ -298,6 +298,19 @@ public class RootClass extends PersistentClass implements TableOwner {
checkTableDuplication();
}
/**
* In {@linkplain jakarta.persistence.InheritanceType#SINGLE_TABLE single table}
* inheritance, subclasses share a table with the root class by definition. But
* for {@linkplain jakarta.persistence.InheritanceType#JOINED joined} or
* {@linkplain jakarta.persistence.InheritanceType#TABLE_PER_CLASS union} mappings,
* the subclasses are assumed to occupy distinct tables, and it's an error to map
* two subclasses to the same table.
* <p>
* As a special exception to this, if a joined inheritance hierarchy defines an
* explicit {@link jakarta.persistence.DiscriminatorColumn}, we tolerate table
* duplication among the subclasses, but we must "force" the discriminator to
* account for this. (See issue HHH-14526.)
*/
private void checkTableDuplication() {
if ( hasSubclasses() ) {
final Set<Table> tables = new HashSet<>();
@ -306,6 +319,7 @@ public class RootClass extends PersistentClass implements TableOwner {
if ( !(subclass instanceof SingleTableSubclass) ) {
final Table table = subclass.getTable();
if ( !tables.add( table ) ) {
// we encountered a duplicate table mapping
if ( getDiscriminator() == null ) {
throw new MappingException( "Two different subclasses of '" + getEntityName()
+ "' map to the table '" + table.getName()
@ -314,7 +328,7 @@ public class RootClass extends PersistentClass implements TableOwner {
else {
// This is arguably not the right place to do this.
// Perhaps it's an issue better dealt with later on
// by the persisters.
// by the persisters. See HHH-14526.
forceDiscriminator = true;
}
break;
@ -324,6 +338,13 @@ public class RootClass extends PersistentClass implements TableOwner {
}
}
/**
* Composite id classes are supposed to override {@link #equals} and
* {@link #hashCode}, and programs will typically experience bugs if
* they don't. But instead of actually enforcing this with an error
* (because we can't anyway verify that the implementation is actually
* <em>correct</em>) we simply log a warning.
*/
private void checkCompositeIdentifier() {
if ( getIdentifier() instanceof Component ) {
final Component id = (Component) getIdentifier();

6
hibernate-core/src/main/java/org/hibernate/mapping/SingleTableSubclass.java
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@ -53,10 +53,8 @@ public class SingleTableSubclass extends Subclass {
public void validate(Metadata mapping) throws MappingException {
if ( getDiscriminator() == null ) {
throw new MappingException(
"No discriminator found for " + getEntityName()
+ ". Discriminator is needed when 'single-table-per-hierarchy' "
+ "is used and a class has subclasses"
throw new MappingException( "No discriminator defined by '" + getSuperclass().getEntityName()
+ "' which is a root class in a 'SINGLE_TABLE' inheritance hierarchy"
);
}
super.validate( mapping );