diff --git a/pom.xml b/pom.xml
index ee688c9..f6b5a71 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,297 +1,53 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" 
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <groupId>com.qianhong.javawebapp</groupId>
-    <artifactId>java-maven-calculator-web-app</artifactId>
-    <packaging>war</packaging>
-    <version>1.1-SNAPSHOT</version>
-    <name>Calculator Web</name>
-    <description>A Java Maven Calculator Web Application Writen By Java, Built By Maven, CI/CD By Jenkins</description>
-    <url>http://maven.apache.org</url>
+<plugins>
+    <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.8.0</version>
+        <configuration>
+            <source>17</source>
+            <target>17</target>
+        </configuration>
+    </plugin>
+
+    <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-war-plugin</artifactId>
+        <version>3.2.2</version>
+    </plugin>
+
+    <!-- REPLACED COBERTURA — NOW USING JACOCO (JDK17 compatible) -->
+   <plugin>
+    <groupId>org.jacoco</groupId>
+    <artifactId>jacoco-maven-plugin</artifactId>
+    <version>0.8.12</version>
+    <executions>
+        <execution>
+            <goals>
+                <goal>prepare-agent</goal>
+            </goals>
+        </execution>
+        <execution>
+            <id>report</id>
+            <phase>test</phase>
+            <goals>
+                <goal>report</goal>
+            </goals>
+        </execution>
+    </executions>
+</plugin>
+
+
+    <!-- Keep Jetty, Cargo, Surefire, etc. — no change -->
+    <plugin>
+        <groupId>org.eclipse.jetty</groupId>
+        <artifactId>jetty-maven-plugin</artifactId>
+        <version>9.4.11.v20180605</version>
+    </plugin>
+
+    <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <version>2.22.0</version>
+    </plugin>
+</plugins>
 
-    <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <jersey-version>2.27</jersey-version>
-    </properties>
-
-    <scm>
-        <connection>scm:git:https://github.com/maping/java-maven-calculator-web-app.git</connection>
-        <developerConnection>scm:git:https://github.com/maping/java-maven-calculator-web-app.git</developerConnection>
-        <url>https://github.com/maping/java-maven-calculator-web-app.git</url>
-        <tag>HEAD</tag>
-    </scm>
-
-    <distributionManagement>
-        <repository>
-            <id>releases</id>
-            <name>Nexus Release Repository</name>
-            <url>http://localhost:8081/repository/maven-releases/</url>
-        </repository>
-        <snapshotRepository>
-            <id>snapshots</id>
-            <name>Nexus Snapshot Repository</name>
-            <url>http://localhost:8081/repository/maven-snapshots/</url>
-        </snapshotRepository>
-    </distributionManagement>
-
-    <dependencies>
-        <dependency>
-            <groupId>org.glassfish.jersey.containers</groupId>
-            <artifactId>jersey-container-servlet-core</artifactId>
-            <version>${jersey-version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.glassfish.jersey.media</groupId>
-            <artifactId>jersey-media-json-jackson</artifactId>
-            <version>${jersey-version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.glassfish.jersey.core</groupId>
-            <artifactId>jersey-server</artifactId>
-            <version>${jersey-version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.glassfish.jersey.inject</groupId>
-            <artifactId>jersey-hk2</artifactId>
-            <version>${jersey-version}</version>
-        </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>4.12</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.httpcomponents</groupId>
-            <artifactId>httpclient</artifactId>
-            <version>4.5.6</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-resources-plugin</artifactId>
-            <version>3.1.0</version>
-        </dependency>
-    </dependencies>
-
-    <build>
-        <finalName>calculator</finalName>
-
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.0</version>
-                <configuration>
-                    <source>${maven.compiler.source}</source>
-                    <target>${maven.compiler.target}</target>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-war-plugin</artifactId>
-                <version>3.2.2</version>
-            </plugin>
-            <plugin>
-                <groupId>org.codehaus.mojo</groupId>
-                <artifactId>cobertura-maven-plugin</artifactId>
-                <version>2.7</version>
-                <executions>
-                    <execution>
-                        <id>cobertura</id>
-                        <phase>test</phase>
-                        <goals>
-                            <goal>cobertura</goal>
-                        </goals>
-                        <configuration>
-                            <formats>
-                                <format>xml</format>
-                                <format>html</format>
-                            </formats>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.eclipse.jetty</groupId>
-                <artifactId>jetty-maven-plugin</artifactId>
-                <version>9.4.11.v20180605</version>
-                <configuration>
-                    <webApp>
-                        <contextPath>/calculator</contextPath>
-                    </webApp>
-                    <webAppSourceDirectory>target/${project.artifactId}-${project.version}</webAppSourceDirectory>
-                    <stopPort>8079</stopPort>
-                    <stopKey>stop-jetty-for-it</stopKey>
-                    <stopWait>10</stopWait>
-                    <httpConnector>
-                        <port>9999</port>
-                        <idleTimeout>60000</idleTimeout>
-                    </httpConnector>
-                </configuration>
-                <executions>
-                    <execution>
-                        <id>start-jetty</id>
-                        <phase>pre-integration-test</phase>
-                        <goals>
-                            <goal>start</goal>
-                        </goals>
-                        <configuration>
-                            <scanIntervalSeconds>0</scanIntervalSeconds>
-                            <daemon>true</daemon>
-                        </configuration>
-                    </execution>
-                    <execution>
-                        <id>stop-jetty</id>
-                        <phase>post-integration-test</phase>
-                        <goals>
-                            <goal>stop</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.22.0</version>
-                <executions>
-                    <execution>
-                        <id>run-integration-test</id>
-                        <phase>integration-test</phase>
-                        <goals>
-                            <goal>test</goal>
-                        </goals>
-                        <configuration>
-                            <includes>
-                                <include>**/*IT.java</include>
-                            </includes>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.codehaus.cargo</groupId>
-                <artifactId>cargo-maven2-plugin</artifactId>
-                <version>1.6.9</version>
-                <configuration>
-                    <container>
-                        <containerId>tomcat8x</containerId>
-                        <home>/Users/maping/apache/tomcat</home>
-                    </container>
-                    <configuration>
-                        <type>existing</type>
-                        <home>/Users/maping/apache/tomcat</home>
-                    </configuration>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>com.lazerycode.jmeter</groupId>
-                <artifactId>jmeter-maven-plugin</artifactId>
-                <version>2.7.0</version>
-                <executions>
-                    <execution>
-                        <id>jmeter-tests</id>
-                        <phase>verify</phase>
-                        <goals>
-                            <goal>jmeter</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>com.microsoft.azure</groupId>
-                <artifactId>azure-webapp-maven-plugin</artifactId>
-                <version>1.4.0</version>
-                <configuration>
-                    <resourceGroup>mapingAppServiceRG</resourceGroup>
-                    <appServicePlanName>mapingAppServicePlan</appServicePlanName>
-                    <appName>mapinglinuxcalculator</appName>
-                    <linuxRuntime>tomcat 9.0-jre8</linuxRuntime>
-                    <deploymentType>ftp</deploymentType>
-                    <resources>
-                        <resource>
-                            <directory>${project.basedir}/target</directory>
-                            <targetPath>webapps</targetPath>
-                            <includes>
-                                <include>*.war</include>
-                            </includes>
-                            <excludes>
-                                <exclude>*.xml</exclude>
-                            </excludes>
-                        </resource>
-                    </resources>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-site-plugin</artifactId>
-                <version>3.7.1</version>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-release-plugin</artifactId>
-                <version>2.5.3</version>
-                <configuration>
-                    <username>username</username>
-                    <password>password</password>
-                    <tagBase>https://github.com/maping/java-maven-calculator-web-app.git</tagBase>
-                    <branchBase>https://github.com/maping/java-maven-calculator-web-app.git</branchBase>
-                </configuration>
-            </plugin>
-
-        </plugins>
-    </build>
-
-    <reporting>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-project-info-reports-plugin</artifactId>
-                <version>3.0.0</version>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-javadoc-plugin</artifactId>
-                <version>3.0.1</version>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-jxr-plugin</artifactId>
-                <version>2.5</version>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-checkstyle-plugin</artifactId>
-                <version>3.0.0</version>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-pmd-plugin</artifactId>
-                <version>3.10.0</version>
-                <configuration>
-                    <skipEmptyReport>false</skipEmptyReport>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.codehaus.mojo</groupId>
-                <artifactId>cobertura-maven-plugin</artifactId>
-                <version>2.7</version>
-                <reportSets>
-                    <reportSet>
-                        <reports>
-                            <report>cobertura</report>
-                        </reports>
-                    </reportSet>
-                </reportSets>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-report-plugin</artifactId>
-                <version>2.22.0</version>
-            </plugin>
-        </plugins>
-    </reporting>
-
-</project>