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[BAEL-16531] - Move all the existing articles on "optional" under java-optional
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‎core-java-modules/core-java-11/README.md‎

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- [An Introduction to Epsilon GC: A No-Op Experimental Garbage Collector](https://www.baeldung.com/jvm-epsilon-gc-garbage-collector)
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- [Guide to jlink](https://www.baeldung.com/jlink)
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- [Negate a Predicate Method Reference with Java 11](https://www.baeldung.com/java-negate-predicate-method-reference)
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- [Transforming an Empty String into an Empty Optional](https://www.baeldung.com/java-empty-string-to-empty-optional)

‎core-java-modules/core-java-8-2/src/main/resources/META-INF/persistence.xml‎

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version="2.0">
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<persistence-unit
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name="com.baeldung.optionalReturnType"
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name="com.baeldung.optionalreturntype"
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transaction-type="RESOURCE_LOCAL">
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<description>Persist Optional Return Type Demo</description>
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<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
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<class>com.baeldung.optionalReturnType.User</class>
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<class>com.baeldung.optionalReturnType.UserOptional</class>
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<class>com.baeldung.optionalreturntype.User</class>
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<class>com.baeldung.optionalreturntype.UserOptional</class>
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<!--
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<class>com.baeldung.optionalReturnType.UserOptionalField</class>
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<class>com.baeldung.optionalreturntype.UserOptionalField</class>
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-->
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<exclude-unlisted-classes>true</exclude-unlisted-classes>
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‎core-java-modules/core-java-9-improvements/README.md‎

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### Relevant Articles:
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- [New Stream Collectors in Java 9](http://www.baeldung.com/java9-stream-collectors)
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- [Java 9 Optional API Additions](https://www.baeldung.com/java-9-optional)
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- [Java 9 Convenience Factory Methods for Collections](https://www.baeldung.com/java-9-collections-factory-methods)
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- [Java 9 Stream API Improvements](https://www.baeldung.com/java-9-stream-api)
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- [Java 9 java.util.Objects Additions](https://www.baeldung.com/java-9-objects-new)

‎core-java-modules/core-java-9-improvements/src/test/java/com/baeldung/java9/Java9OptionalTest.java‎

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‎core-java-modules/core-java-9/README.md‎

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### Relevant Articles:
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- [Method Handles in Java](http://www.baeldung.com/java-method-handles)
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- [Introduction to Chronicle Queue](http://www.baeldung.com/java-chronicle-queue)
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- [Optional orElse Optional](http://www.baeldung.com/java-optional-or-else-optional)
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- [Method Handles in Java](https://www.baeldung.com/java-method-handles)
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- [Introduction to Chronicle Queue](https://www.baeldung.com/java-chronicle-queue)
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- [Iterate Through a Range of Dates in Java](https://www.baeldung.com/java-iterate-date-range)
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- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
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- [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)
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- [Filtering a Stream of Optionals in Java](https://www.baeldung.com/java-filter-stream-of-optional)
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Note: also contains part of the code for the article
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[How to Filter a Collection in Java](https://www.baeldung.com/java-collection-filtering).

‎core-java-modules/core-java-9/src/test/java/com/baeldung/optionals/OptionalsTest.java‎

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‎core-java-modules/core-java-exceptions/README.md‎

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- [Java – Try with Resources](https://www.baeldung.com/java-try-with-resources)
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- [Java Global Exception Handler](https://www.baeldung.com/java-global-exception-handler)
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- [Common Java Exceptions](https://www.baeldung.com/java-common-exceptions)
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- [Throw Exception in Optional in Java 8](https://www.baeldung.com/java-optional-throw-exception)
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- [How to Find an Exception’s Root Cause in Java](https://www.baeldung.com/java-exception-root-cause)
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- [Is It a Bad Practice to Catch Throwable?](https://www.baeldung.com/java-catch-throwable-bad-practice)

‎core-java-modules/core-java-optional/README.md‎

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=========
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## Java Optional
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## Core Java Optional
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This module contains articles about Java Optional.
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### Relevant Articles:
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- [Java Optional as Return Type](https://www.baeldung.com/java-optional-return)
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- [Guide To Java 8 Optional](https://www.baeldung.com/java-optional)
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- [Java Optional – orElse() vs orElseGet()](https://www.baeldung.com/java-optional-or-else-vs-or-else-get)
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- [Guide to Java 8 Optional](https://www.baeldung.com/java-optional)
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- [Java Optional – orElse() vs orElseGet()](https://www.baeldung.com/java-optional-or-else-vs-or-else-get)
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- [Transforming an Empty String into an Empty Optional](https://www.baeldung.com/java-empty-string-to-empty-optional)
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- [Filtering a Stream of Optionals in Java](https://www.baeldung.com/java-filter-stream-of-optional)
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- [Java 9 Optional API Additions](https://www.baeldung.com/java-9-optional)
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- [Throw Exception in Optional in Java 8](https://www.baeldung.com/java-optional-throw-exception)
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- [Optional orElse Optional](https://www.baeldung.com/java-optional-or-else-optional)

‎core-java-modules/core-java-optional/pom.xml‎

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<artifactId>jmh-generator-bytecode</artifactId>
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<version>${jmh-generator.version}</version>
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</dependency>
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<dependency>
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<groupId>com.google.guava</groupId>
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<artifactId>guava</artifactId>
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<version>${guava.version}</version>
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</dependency>
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<dependency>
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<groupId>io.rest-assured</groupId>
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<artifactId>json-path</artifactId>
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<version>${rest-assured.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<properties>
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<hibernate.core.version>5.4.0.Final</hibernate.core.version>
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<jmh-core.version>1.19</jmh-core.version>
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<jmh-generator.version>1.19</jmh-generator.version>
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<guava.version>27.1-jre</guava.version>
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<assertj.version>3.10.0</assertj.version>
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<rest-assured.version>3.1.1</rest-assured.version>
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</properties>
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</project>

core-java-modules/core-java-optional/src/main/java/com/baeldung/optional/OrElseAndOrElseGet.java renamed to core-java-modules/core-java-optional/src/main/java/com/baeldung/optional/orelse/OrElseAndOrElseGet.java

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package com.baeldung.optional;
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package com.baeldung.optional.orelse;
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import java.util.Arrays;
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import java.util.List;

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