diff --git a/java-jasper/pom.xml b/java-jasper/pom.xml
new file mode 100644
index 00000000..37666f32
--- /dev/null
+++ b/java-jasper/pom.xml
@@ -0,0 +1,36 @@
+
+
+
+ 4.0.0
+
+ com.hmkcode
+ java-jasper
+ 1.0-SNAPSHOT
+
+ java-jasper
+
+ http://www.example.com
+
+
+ UTF-8
+ 1.7
+ 1.7
+
+
+
+
+ net.sf.jasperreports
+ jasperreports
+ 6.10.0
+
+
+
+
+ org.springframework
+ spring-core
+ 5.2.3.RELEASE
+
+
+
+
diff --git a/java-jasper/src/main/java/com/hmkcode/App.java b/java-jasper/src/main/java/com/hmkcode/App.java
new file mode 100644
index 00000000..72853237
--- /dev/null
+++ b/java-jasper/src/main/java/com/hmkcode/App.java
@@ -0,0 +1,61 @@
+package com.hmkcode;
+
+import net.sf.jasperreports.engine.*;
+import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
+import org.springframework.util.ResourceUtils;
+
+import java.io.*;
+import java.util.*;
+
+public class App
+{
+ // name and destination of output file e.g. "report.pdf"
+ private static String destFileName = "report.pdf";
+ public static void main( String[] args ) throws FileNotFoundException, JRException {
+
+ System.out.println( "generating jasper report..." );
+
+ // 1. compile template ".jrxml" file
+ JasperReport jasperReport = getJasperReport();
+
+ // 2. parameters "empty"
+ Map parameters = getParameters();
+
+ // 3. datasource "java object"
+ JRDataSource dataSource = getDataSource();
+
+ JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, dataSource);
+ JasperExportManager.exportReportToPdfFile(jasperPrint, destFileName);
+
+ }
+
+ private static JasperReport getJasperReport() throws FileNotFoundException, JRException {
+ File template = ResourceUtils.getFile("classpath:report.jrxml");
+ return JasperCompileManager.compileReport(template.getAbsolutePath());
+ }
+ private static Map getParameters(){
+ Map parameters = new HashMap<>();
+ parameters.put("createdBy", "hmkcode");
+ return parameters;
+ }
+
+ private static JRDataSource getDataSource(){
+
+ List countries = new LinkedList<>();
+
+ countries.add(new Country("IS", "Iceland", "https://i.pinimg.com/originals/72/b4/49/72b44927f220151547493e528a332173.png"));
+ countries.add(new Country("TR", "Turkey", "https://i.pinimg.com/originals/82/63/23/826323bba32e6e5a5996062c3a3c662f.png"));
+ countries.add(new Country("ZA", "South Africa", "https://i.pinimg.com/originals/f5/c7/8d/f5c78da001b46e26481c04fb93473454.png"));
+ countries.add(new Country("PL", "Poland", "https://i.pinimg.com/originals/7f/ae/21/7fae21c4854010b11127218ead743863.png"));
+ countries.add(new Country("CA", "Canada", "https://i.pinimg.com/originals/4d/d4/01/4dd401733ba25e6442fc8696e04e5846.png"));
+
+ countries.add(new Country("PA", "Panama", "https://i.pinimg.com/originals/84/dc/e4/84dce49e52ebfb5b3814393069807e0a.png"));
+ countries.add(new Country("HR", "Croatia", "https://i.pinimg.com/originals/f5/8c/94/f58c94a2a2b3221328fc1e2b7acfa656.png"));
+ countries.add(new Country("JP", "Japan", "https://i.pinimg.com/originals/a5/d6/88/a5d688289cd6850016f14fe93b17da01.png"));
+ countries.add(new Country("DE", "Germany", "https://i.pinimg.com/originals/af/c9/b2/afc9b2592a9f1cf591e8a52256ae1e9f.png"));
+ countries.add(new Country("BR", "Brazil", "https://i.pinimg.com/originals/e4/03/c4/e403c4447a3bd8940459ae4f50856bed.png"));
+
+
+ return new JRBeanCollectionDataSource(countries);
+ }
+}
diff --git a/java-jasper/src/main/java/com/hmkcode/Country.java b/java-jasper/src/main/java/com/hmkcode/Country.java
new file mode 100644
index 00000000..ecbc501d
--- /dev/null
+++ b/java-jasper/src/main/java/com/hmkcode/Country.java
@@ -0,0 +1,47 @@
+package com.hmkcode;
+
+public class Country {
+
+ private String code;
+ private String name;
+ private String url;
+
+ public Country(String code, String name, String url) {
+ this.code = code;
+ this.name = name;
+ this.url = url;
+ }
+
+ public String getCode() {
+ return code;
+ }
+
+ public void setCode(String code) {
+ this.code = code;
+ }
+
+ public String getName() {
+ return name;
+ }
+
+ public void setName(String name) {
+ this.name = name;
+ }
+
+ public String getUrl() {
+ return url;
+ }
+
+ public void setUrl(String url) {
+ this.url = url;
+ }
+
+ @Override
+ public String toString() {
+ return "Country{" +
+ "code='" + code + '\'' +
+ ", name='" + name + '\'' +
+ ", url='" + url + '\'' +
+ '}';
+ }
+}
diff --git a/java-jasper/src/main/resources/report.jrxml b/java-jasper/src/main/resources/report.jrxml
new file mode 100644
index 00000000..113a787a
--- /dev/null
+++ b/java-jasper/src/main/resources/report.jrxml
@@ -0,0 +1,37 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/java-spi/java-spi-api/pom.xml b/java-spi/java-spi-api/pom.xml
new file mode 100644
index 00000000..e7c1e87d
--- /dev/null
+++ b/java-spi/java-spi-api/pom.xml
@@ -0,0 +1,27 @@
+
+
+
+ 4.0.0
+
+ com.hmkcode.api
+ java-spi-api
+ 1.0-SNAPSHOT
+
+ java-spi-api
+
+ http://www.example.com
+
+
+ UTF-8
+ 1.7
+ 1.7
+
+
+
+
+
+
+
+
+
diff --git a/java-spi/java-spi-api/src/main/java/com/hmkcode/api/MyService.java b/java-spi/java-spi-api/src/main/java/com/hmkcode/api/MyService.java
new file mode 100644
index 00000000..4928f453
--- /dev/null
+++ b/java-spi/java-spi-api/src/main/java/com/hmkcode/api/MyService.java
@@ -0,0 +1,6 @@
+package com.hmkcode.api;
+
+public interface MyService {
+
+ void doSomething();
+}
diff --git a/java-spi/java-spi-api/src/main/java/com/hmkcode/api/MyServiceProviderInterface.java b/java-spi/java-spi-api/src/main/java/com/hmkcode/api/MyServiceProviderInterface.java
new file mode 100644
index 00000000..8e166424
--- /dev/null
+++ b/java-spi/java-spi-api/src/main/java/com/hmkcode/api/MyServiceProviderInterface.java
@@ -0,0 +1,6 @@
+package com.hmkcode.api;
+
+public interface MyServiceProviderInterface {
+
+ MyService getService();
+}
diff --git a/java-spi/java-spi-app/lib/java-spi-api-1.0-SNAPSHOT.jar b/java-spi/java-spi-app/lib/java-spi-api-1.0-SNAPSHOT.jar
new file mode 100644
index 00000000..23a1c6be
Binary files /dev/null and b/java-spi/java-spi-app/lib/java-spi-api-1.0-SNAPSHOT.jar differ
diff --git a/java-spi/java-spi-app/lib/java-spi-impl1-1.0-SNAPSHOT.jar b/java-spi/java-spi-app/lib/java-spi-impl1-1.0-SNAPSHOT.jar
new file mode 100644
index 00000000..c8007874
Binary files /dev/null and b/java-spi/java-spi-app/lib/java-spi-impl1-1.0-SNAPSHOT.jar differ
diff --git a/java-spi/java-spi-app/pom.xml b/java-spi/java-spi-app/pom.xml
new file mode 100644
index 00000000..74906a4f
--- /dev/null
+++ b/java-spi/java-spi-app/pom.xml
@@ -0,0 +1,40 @@
+
+
+
+ 4.0.0
+
+ com.hmkcode.app
+ java-spi-app
+ 1.0-SNAPSHOT
+
+ java-spi-app
+
+ http://www.example.com
+
+
+ UTF-8
+ 1.7
+ 1.7
+
+
+
+
+
+ com.hmkcode.api
+ java-spi-api
+ 1.0-SNAPSHOT
+ system
+ ${project.basedir}/lib/java-spi-api-1.0-SNAPSHOT.jar
+
+
+ com.hmkcode.impl
+ java-spi-impl1
+ 1.0-SNAPSHOT
+ system
+ ${project.basedir}/lib/java-spi-impl1-1.0-SNAPSHOT.jar
+
+
+
+
+
diff --git a/java-spi/java-spi-app/src/main/java/com/hmkcode/app/App.java b/java-spi/java-spi-app/src/main/java/com/hmkcode/app/App.java
new file mode 100644
index 00000000..8e46d684
--- /dev/null
+++ b/java-spi/java-spi-app/src/main/java/com/hmkcode/app/App.java
@@ -0,0 +1,9 @@
+package com.hmkcode.app;
+
+public class App
+{
+ public static void main( String[] args )
+ {
+ MyServiceLoader.defaultProvider().getService().doSomething();
+ }
+}
diff --git a/java-spi/java-spi-app/src/main/java/com/hmkcode/app/MyServiceLoader.java b/java-spi/java-spi-app/src/main/java/com/hmkcode/app/MyServiceLoader.java
new file mode 100644
index 00000000..2efc5d74
--- /dev/null
+++ b/java-spi/java-spi-app/src/main/java/com/hmkcode/app/MyServiceLoader.java
@@ -0,0 +1,31 @@
+package com.hmkcode.app;
+
+import java.nio.file.ProviderNotFoundException;
+import java.util.Iterator;
+import java.util.ServiceLoader;
+
+import com.hmkcode.api.MyServiceProviderInterface;
+
+
+public class MyServiceLoader {
+
+ private static final String DEFAULT_PROVIDER = "com.hmkcode.impl.MyServiceProviderImpl1";
+
+ public static MyServiceProviderInterface defaultProvider() {
+ return provider(DEFAULT_PROVIDER);
+ }
+
+ public static MyServiceProviderInterface provider(String providerName) {
+ ServiceLoader loader = ServiceLoader.load(MyServiceProviderInterface.class);
+
+ Iterator it = loader.iterator();
+ while (it.hasNext()) {
+ MyServiceProviderInterface provider = it.next();
+ if (providerName.equals(provider.getClass().getName())) {
+ return provider;
+ }
+ }
+ throw new ProviderNotFoundException("provider " + providerName + " not found");
+ }
+
+}
diff --git a/java-spi/java-spi-impl1/lib/java-spi-api-1.0-SNAPSHOT.jar b/java-spi/java-spi-impl1/lib/java-spi-api-1.0-SNAPSHOT.jar
new file mode 100644
index 00000000..23a1c6be
Binary files /dev/null and b/java-spi/java-spi-impl1/lib/java-spi-api-1.0-SNAPSHOT.jar differ
diff --git a/java-spi/java-spi-impl1/pom.xml b/java-spi/java-spi-impl1/pom.xml
new file mode 100644
index 00000000..2e234c96
--- /dev/null
+++ b/java-spi/java-spi-impl1/pom.xml
@@ -0,0 +1,31 @@
+
+
+
+ 4.0.0
+
+ com.hmkcode.impl
+ java-spi-impl1
+ 1.0-SNAPSHOT
+
+ java-spi-impl1
+
+ http://www.example.com
+
+
+ UTF-8
+ 1.7
+ 1.7
+
+
+
+
+ com.hmkcode.api
+ java-spi-api
+ 1.0-SNAPSHOT
+ system
+ ${project.basedir}/lib/java-spi-api-1.0-SNAPSHOT.jar
+
+
+
+
diff --git a/java-spi/java-spi-impl1/src/main/java/com/hmkcode/impl/MyServiceImpl1.java b/java-spi/java-spi-impl1/src/main/java/com/hmkcode/impl/MyServiceImpl1.java
new file mode 100644
index 00000000..24afcfa4
--- /dev/null
+++ b/java-spi/java-spi-impl1/src/main/java/com/hmkcode/impl/MyServiceImpl1.java
@@ -0,0 +1,12 @@
+package com.hmkcode.impl;
+
+import com.hmkcode.api.MyService;
+
+public class MyServiceImpl1 implements MyService{
+
+ @Override
+ public void doSomething() {
+ System.out.println("MyServiceImpl1");
+
+ }
+}
diff --git a/java-spi/java-spi-impl1/src/main/java/com/hmkcode/impl/MyServiceProviderImpl1.java b/java-spi/java-spi-impl1/src/main/java/com/hmkcode/impl/MyServiceProviderImpl1.java
new file mode 100644
index 00000000..252b7a3e
--- /dev/null
+++ b/java-spi/java-spi-impl1/src/main/java/com/hmkcode/impl/MyServiceProviderImpl1.java
@@ -0,0 +1,13 @@
+package com.hmkcode.impl;
+
+import com.hmkcode.api.MyService;
+import com.hmkcode.api.MyServiceProviderInterface;
+
+public class MyServiceProviderImpl1 implements MyServiceProviderInterface {
+
+ @Override
+ public MyService getService() {
+ return new MyServiceImpl1();
+ }
+
+}
diff --git a/java-spi/java-spi-impl1/src/main/resources/META-INF/services/com.hmkcode.api.MyServiceProviderInterface b/java-spi/java-spi-impl1/src/main/resources/META-INF/services/com.hmkcode.api.MyServiceProviderInterface
new file mode 100644
index 00000000..008c8c11
--- /dev/null
+++ b/java-spi/java-spi-impl1/src/main/resources/META-INF/services/com.hmkcode.api.MyServiceProviderInterface
@@ -0,0 +1 @@
+com.hmkcode.impl.MyServiceProviderImpl1
\ No newline at end of file