DATAJPA-891 - Avoid creating unnecessary exceptions in JpaPersistenEntityImpl.

JpaPersistentEntityImpl.isEntity() currently called a method on the JPA meta-model, catching an exception to indicate the given type is not managed. We're now rather iterate over all managed types to avoid the overhead of the exception being thrown and handled immediately.

src/main/java/org/springframework/data/jpa/mapping/JpaPersistentPropertyImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -37,6 +37,7 @@ import javax.persistence.OneToOne;
 import javax.persistence.OrderColumn;
 import javax.persistence.Transient;
 import javax.persistence.Version;
+import javax.persistence.metamodel.ManagedType;
 import javax.persistence.metamodel.Metamodel;
 
 import org.springframework.core.annotation.AnnotationUtils;
@@ -155,12 +156,13 @@ class JpaPersistentPropertyImpl extends AnnotationBasedPersistentProperty<JpaPer
 	@Override
 	public boolean isEntity() {
 
-		try {
-			metamodel.managedType(getActualType());
-			return true;
-		} catch (IllegalArgumentException o_O) {
-			return false;
+		for (ManagedType<?> type : metamodel.getManagedTypes()) {
+			if (type.getJavaType().equals(getActualType())) {
+				return true;
+			}
 		}
+
+		return false;
 	}
 
 	/*