Adjust tests

Author: vladmihalcea

core/src/test/java/com/vladmihalcea/book/hpjp/hibernate/association/BidirectionalOneToOneOptionalTest.java

@@ -35,8 +35,6 @@ public void testLifecycle() {
             LOGGER.info("Fetching Post");
             Post post = entityManager.find(Post.class, 1L);
             assertNotNull(post);
-
-            post.setDetails(null);
         });
     }
 
@@ -50,7 +48,7 @@ public static class Post {
 
         private String title;
 
-        @OneToOne(mappedBy = "post", cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true)
+        @OneToOne(mappedBy = "post", cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true, optional = true)
         private PostDetails details;
 
         public Post() {}
@@ -107,7 +105,7 @@ public static class PostDetails {
         private String createdBy;
 
         @OneToOne(fetch = FetchType.LAZY)
-        @JoinColumn(name = "post_id")
+        @MapsId
         private Post post;
 
         public PostDetails() {}

core/src/test/java/com/vladmihalcea/book/hpjp/hibernate/inheritance/TablePerClassTest.java

@@ -1,6 +1,7 @@
 package com.vladmihalcea.book.hpjp.hibernate.inheritance;
 
 import com.vladmihalcea.book.hpjp.util.AbstractTest;
+import com.vladmihalcea.book.hpjp.util.providers.Database;
 import org.junit.Test;
 
 import javax.persistence.*;
@@ -26,6 +27,14 @@ protected Class<?>[] entities() {
         };
     }
 
+    @Override
+    protected Database database() {
+        // When using MySQL with older Hibernate versions,
+        // UNION is used instead of UNION ALL
+        // return Database.MYSQL;
+        return Database.POSTGRESQL;
+    }
+
     @Test
     public void test() {
         Topic topic = doInJPA(entityManager -> {

core/src/test/java/com/vladmihalcea/book/hpjp/hibernate/type/json/sql/DefaultPostgreSQLJsonNodeBinaryTypeFetchTest.java

@@ -36,7 +36,7 @@ public void testFetchJsonPropertyUsingNativeSQL() {
         } catch (Exception e) {
             LOGGER.error("Failure", e);
 
-            Exception rootCause = (Exception) ExceptionUtil.rootCause(e);
+            Exception rootCause = ExceptionUtil.rootCause(e);
             assertEquals("No Dialect mapping for JDBC type: 1111", rootCause.getMessage());
         }
     }

core/src/test/java/com/vladmihalcea/book/hpjp/util/exception/ExceptionUtil.java

@@ -16,7 +16,7 @@
  */
 public interface ExceptionUtil {
 
-	static List<Class<? extends Exception>> LOCK_TIMEOUT_EXCEPTIONS = Arrays.asList(
+	List<Class<? extends Exception>> LOCK_TIMEOUT_EXCEPTIONS = Arrays.asList(
 		LockAcquisitionException.class,
 		LockTimeoutException.class,
 		PessimisticLockException.class,
@@ -31,12 +31,12 @@ public interface ExceptionUtil {
 	 *
 	 * @return exception root cause
 	 */
-	static Throwable rootCause(Throwable t) {
+	static <T extends Throwable> T rootCause(Throwable t) {
 		Throwable cause = t.getCause();
 		if ( cause != null && cause != t ) {
 			return rootCause( cause );
 		}
-		return t;
+		return (T) t;
 	}
 
 	/**