java-20349: move pre-jpms module to core-java-9 module

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

@@ -12,3 +12,4 @@ This module contains articles about Java 9 core features
 - [Private Methods in Java Interfaces](https://www.baeldung.com/java-interface-private-methods)
 - [Java Scanner useDelimiter with Examples](https://www.baeldung.com/java-scanner-usedelimiter)
 - [Is There a Destructor in Java?](https://www.baeldung.com/java-destructor)
+- [Java 9 Migration Issues and Resolutions](https://www.baeldung.com/java-9-migration-issue)

core-java-modules/core-java-9/pom.xml

@@ -46,6 +46,11 @@
             <artifactId>commons-io</artifactId>
             <version>${commons-io.version}</version>
         </dependency>
+        <dependency>
+            <groupId>javax.xml.bind</groupId>
+            <artifactId>jaxb-api</artifactId>
+            <version>${javax.xml.bind.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -58,6 +63,9 @@
                 <configuration>
                     <source>${maven.compiler.source}</source>
                     <target>${maven.compiler.target}</target>
+                    <compilerArgs>
+                        <arg>--add-exports=java.base/com.sun.crypto.provider=ALL-UNNAMED</arg>
+                    </compilerArgs>
                 </configuration>
             </plugin>
         </plugins>
@@ -74,6 +82,7 @@
         <awaitility.version>1.7.0</awaitility.version>
         <maven.compiler.source>1.9</maven.compiler.source>
         <maven.compiler.target>1.9</maven.compiler.target>
+        <javax.xml.bind.version>2.4.0-b180725.0427</javax.xml.bind.version>
     </properties>
 
 </project>

core-java-modules/core-java-9/src/main/java/com/baeldung/java9/prejpms/App.java

@@ -0,0 +1,78 @@
+package com.baeldung.java9.prejpms;
+
+import java.io.StringWriter;
+import java.lang.StackWalker.Option;
+import java.lang.StackWalker.StackFrame;
+import java.util.Base64;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.Marshaller;
+
+import com.sun.crypto.provider.SunJCE;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class App {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
+
+    public static void main(String[] args) throws Exception {
+
+        getCrytpographyProviderName();
+        getCallStackClassNames();
+        getXmlFromObject(new Book(100, "Java Modules Architecture"));
+        getBase64EncodedString("Java");
+    }
+
+    private static void getCrytpographyProviderName() {
+        try {
+            LOGGER.info("1. JCE Provider Name: {}\n", new SunJCE().getName());
+        } catch (Throwable e) {
+            LOGGER.error(e.toString());
+        }
+    }
+
+    private static void getCallStackClassNames() {
+        try {
+            StringBuffer sbStack = new StringBuffer();
+            AtomicInteger i = new AtomicInteger(0);
+            StackWalker.getInstance((Option.RETAIN_CLASS_REFERENCE))
+              .walk(s -> s.map(StackFrame::getDeclaringClass)
+                .map(e -> {
+                    i.getAndIncrement();
+                    return e.getName();
+                }))
+              .forEach(name -> sbStack.append(String.format("%d. %s \n", i.get(), name)));
+            LOGGER.info("2. Call Stack:\n{}", sbStack);
+        } catch (Throwable e) {
+            LOGGER.error(e.toString());
+        }
+    }
+
+    private static void getXmlFromObject(Book book) {
+        try {
+            Marshaller marshallerObj = JAXBContext.newInstance(Book.class)
+              .createMarshaller();
+            marshallerObj.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
+
+            StringWriter sw = new StringWriter();
+            marshallerObj.marshal(book, sw);
+            LOGGER.info("3. Xml for Book object:\n{}", sw);
+        } catch (Throwable e) {
+            LOGGER.error(e.toString());
+        }
+
+    }
+
+    private static void getBase64EncodedString(String inputString) {
+        try {
+            String encodedString = new String(Base64.getEncoder()
+              .encode(inputString.getBytes()));
+            LOGGER.info("4. Base Encoded String: {}", encodedString);
+        } catch (Throwable e) {
+            LOGGER.error(e.toString());
+        }
+    }
+}

core-java-modules/core-java-9/src/main/java/com/baeldung/java9/prejpms/Book.java

@@ -0,0 +1,37 @@
+package com.baeldung.java9.prejpms;
+
+import javax.xml.bind.annotation.XmlAttribute;
+import javax.xml.bind.annotation.XmlElement;
+import javax.xml.bind.annotation.XmlRootElement;
+
+@XmlRootElement(name = "book")
+public class Book {
+    private long id;
+    private String name;
+
+    public Book() {
+    }
+
+    public Book(long id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    @XmlAttribute
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    @XmlElement(name = "title")
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Long getId() {
+        return id;
+    }
+}