src/javax/persistence/Id.java

@@ -0,0 +1,55 @@
+/*******************************************************************************
+ * Copyright (c) 2008 - 2013 Oracle Corporation. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
+ * which accompanies this distribution.
+ * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
+ * and the Eclipse Distribution License is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * Contributors:
+ *     Linda DeMichiel - Java Persistence 2.1
+ *     Linda DeMichiel - Java Persistence 2.0
+ *
+ ******************************************************************************/
+package javax.persistence;
+
+import java.lang.annotation.Target;
+import java.lang.annotation.Retention;
+import static java.lang.annotation.ElementType.FIELD;
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+/**
+ * Specifies the primary key of an entity.
+ * The field or property to which the <code>Id</code> annotation is applied 
+ * should be one of the following types: any Java primitive type; 
+ * any primitive wrapper type; 
+ * <code>String</code>; 
+ * <code>java.util.Date</code>; 
+ * <code>java.sql.Date</code>; 
+ * <code>java.math.BigDecimal</code>;
+ * <code>java.math.BigInteger</code>.
+ *
+ * <p>The mapped column for the primary key of the entity is assumed 
+ * to be the primary key of the primary table. If no <code>Column</code> annotation 
+ * is specified, the primary key column name is assumed to be the name 
+ * of the primary key property or field.
+ *
+ * <pre>
+ *   Example:
+ *
+ *   &#064;Id
+ *   public Long getId() { return id; }
+ * </pre>
+ *
+ * @see Column
+ * @see GeneratedValue
+ *
+ * @since Java Persistence 1.0
+ */
+@Target({METHOD, FIELD})
+@Retention(RUNTIME)
+
+public @interface Id {}