Add AutoClose wrappers for JPA classes

Added EntityMgrCloser and EntityMgrTrans classes that will automatically
close/rollback the wrapped JPA classes.  As a result, these classes can
be used in try-with-resource statements to ensure that the JPA
EntityTransaction is rolled back and the EntityManager is closed.
Add "build" section into pom to make it consistent with other poms
in common.
Changed scope to "provided" in utils pom for javax.persistence to
prevent clashes with other projects that depend on the utils project.
Changed scope to "test" in utils pom and to "provided" in utils-test
pom for junit.
Fixed license date in EntityTransCloser.
Fixed license titles in utils & utils-test source files.
Moved files from package xxx.test.jpa to package xxx.jpa, because they
are not test-specific classes.
Include exception when logging message in ThrowablesTester, hopefully
eliminating sonar complaint.

Change-Id: I531f20d93a679d4bb432c1d75c1feac0e334bc44
Issue-ID: POLICY-582
Signed-off-by: Jim Hahn <jrh3@att.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/utils/src/main/java/org/onap/policy/common/utils/jpa/EntityTransCloser.java b/utils/src/main/java/org/onap/policy/common/utils/jpa/EntityTransCloser.java
new file mode 100644
index 00000000..ce300741
--- /dev/null
+++ b/utils/src/main/java/org/onap/policy/common/utils/jpa/EntityTransCloser.java
@@ -0,0 +1,77 @@
+/*
+ * ============LICENSE_START=======================================================
+ * Common Utils
+ * ================================================================================
+ * Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.utils.jpa;
+
+import javax.persistence.EntityTransaction;
+
+/**
+ * Wrapper for an <i>EntityTransaction</i> that is auto-rolled back when closed.
+ * This is useful in try-with-resources statements.
+ */
+public class EntityTransCloser implements AutoCloseable {
+
+	/**
+	 * Transaction to be rolled back.
+	 */
+	private final EntityTransaction trans;
+
+	/**
+	 * Begins a transaction.
+	 * 
+	 * @param et
+	 *            transaction to wrap/begin
+	 */
+	public EntityTransCloser(EntityTransaction et) {
+		trans = et;
+		trans.begin();
+	}
+
+	/**
+	 * Gets the wrapped transaction.
+	 * 
+	 * @return the transaction
+	 */
+	public EntityTransaction getTransation() {
+		return trans;
+	}
+
+	/**
+	 * Commits the transaction.
+	 */
+	public void commit() {
+		trans.commit();
+	}
+
+	/**
+	 * Rolls back the transaction.
+	 */
+	public void rollback() {
+		trans.rollback();
+	}
+
+	@Override
+	public void close() {
+		if (trans.isActive()) {
+			trans.rollback();
+		}
+	}
+
+}