perf(hibernate processor): fix null errors

Author: kingg22

tooling/metamodel-generator/src/main/java/org/hibernate/processor/ClassWriter.java

@@ -306,6 +306,9 @@ private static String writeGeneratedAnnotation(Metamodel entity, Context context
 	private static String writeSuppressWarnings(Context context) {
 		final StringBuilder annotation = new StringBuilder("@SuppressWarnings({");
 		final String[] warnings = context.getSuppressedWarnings();
+		if (warnings == null || warnings.length == 0) {
+			return "@SuppressWarnings({})";
+		}
 		for (int i = 0; i < warnings.length; i++) {
 			if ( i>0 ) {
 				annotation.append(", ");

tooling/metamodel-generator/src/main/java/org/hibernate/processor/HibernateProcessor.java

@@ -513,7 +513,7 @@ private void createMetaModelClasses() {
 
 		for ( Metamodel aux : context.getMetaAuxiliaries() ) {
 			if ( !context.isAlreadyGenerated(aux)
-				&& !isClassRecordOrInterfaceType( aux.getElement().getEnclosingElement() ) ) {
+				&& !isClassRecordOrInterfaceType( requireNonNull( aux.getElement().getEnclosingElement() ) ) ) {
 				context.logMessage( Diagnostic.Kind.OTHER,
 						"Writing metamodel for auxiliary '" + aux + "'" );
 				ClassWriter.writeFile( aux, context );

tooling/metamodel-generator/src/main/java/org/hibernate/processor/annotation/AnnotationMetaEntity.java

@@ -420,7 +420,7 @@ else if ( hasAnnotation( method, JD_DELETE ) ) {
 						queryMethods.add( method );
 					}
 				}
-				else if ( method.getEnclosingElement().getKind().isInterface()
+				else if ( requireNonNull( method.getEnclosingElement() ).getKind().isInterface()
 						&& !method.isDefault()
 						&& !method.getModifiers().contains(Modifier.PRIVATE)
 						&& !isSessionGetter(method) ) {
@@ -1507,7 +1507,7 @@ else if ( typeUtils.isSameType( backType, element.asType() ) ) {
 	}
 
 	private boolean isPersistent(Element memberOfClass, AccessType membersKind) {
-		return ( entityAccessTypeInfo.getAccessType() == membersKind
+		return ( ( entityAccessTypeInfo != null && entityAccessTypeInfo.getAccessType() == membersKind )
 					|| determineAnnotationSpecifiedAccessType( memberOfClass ) != null )
 			&& !containsAnnotation( memberOfClass, TRANSIENT )
 			&& !memberOfClass.getModifiers().contains( Modifier.TRANSIENT )

tooling/metamodel-generator/src/main/java/org/hibernate/processor/util/xml/JpaNamespaceTransformingEventReader.java

@@ -158,7 +158,8 @@ private List<Attribute> updateElementAttributes(StartElement startElement) {
 		while ( existingAttributesIterator.hasNext() ) {
 			Attribute attribute = existingAttributesIterator.next();
 			if ( VERSION_ATTRIBUTE_NAME.equals( attribute.getName().getLocalPart() ) ) {
-				if ( currentDocumentNamespaceUri.equals( DEFAULT_PERSISTENCE_NAMESPACE ) ) {
+				if ( currentDocumentNamespaceUri != null &&
+					currentDocumentNamespaceUri.equals( DEFAULT_PERSISTENCE_NAMESPACE ) ) {
 					if ( !DEFAULT_PERSISTENCE_VERSION.equals( attribute.getName().getPrefix() ) ) {
 						newElementAttributeList.add(
 								xmlEventFactory.createAttribute(