Develop Reference

Jdivert java.lang.ClassNotFoundException error when ran

Trying to use this library, but whenever I run it. It gives me the following. I updated my pom file and thought it would be the solution, but I still receive an error.
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/jna/Pointer
at org.example.Main.main(Main.java:11)
Caused by: java.lang.ClassNotFoundException: com.sun.jna.Pointer
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 1 more
Here is my code
public class Main {
public static void main(String[] args) throws WinDivertException {
System.out.println("Hello world!");
WinDivert w = new WinDivert("tcp.DstPort == 80 and tcp.PayloadLength > 0");
w.open(); // packets will be captured from now on
Packet packet = w.recv(); // read a single packet
System.out.println(packet);
w.send(packet); // re-inject the packet into the network stack
w.close(); // stop capturing packets
}
}
And here is my pom.xml file
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>Glacial1.1</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>com.github.ffalcinelli</groupId>
<artifactId>jdivert</artifactId>
<version>1.1</version>
</dependency>
</dependencies>
<properties>
<maven.compiler.source>18</maven.compiler.source>
<maven.compiler.target>18</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
</project>
Tried updating my pom file and it didn't work

Problem with hibernate + maven + mysql server configuration

I have a problem with connecting to mysql database that I have created on google cloud. I easily connected mysql workbench to the database but I have a problem with configuring hibernate in my maven project. Here is the error log that shows when I want to run my application:
Exception in Application start method
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1071)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.NoClassDefFoundError: java/sql/SQLException
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:468)
at org.jboss.logging#3.4.2.Final/org.jboss.logging.Logger.doGetMessageLogger(Logger.java:2562)
at org.jboss.logging#3.4.2.Final/org.jboss.logging.Logger.getMessageLogger(Logger.java:2530)
at org.jboss.logging#3.4.2.Final/org.jboss.logging.Logger.getMessageLogger(Logger.java:2516)
at org.hibernate.orm.core#5.5.7.Final/org.hibernate.internal.HEMLogging.messageLogger(HEMLogging.java:28)
at org.hibernate.orm.core#5.5.7.Final/org.hibernate.internal.HEMLogging.messageLogger(HEMLogging.java:24)
at org.hibernate.orm.core#5.5.7.Final/org.hibernate.jpa.boot.internal.PersistenceXmlParser.<clinit>(PersistenceXmlParser.java:54)
at org.hibernate.orm.core#5.5.7.Final/org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:81)
at org.hibernate.orm.core#5.5.7.Final/org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:61)
at org.hibernate.orm.core#5.5.7.Final/org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:50)
at java.persistence#2.2/javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
at java.persistence#2.2/javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
at SlidingPuzzle/controllers.Main.start(Main.java:36)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
... 1 more
Caused by: java.lang.ClassNotFoundException: java.sql.SQLException
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 23 more
Exception running application controllers.Main
Here is my pom file:
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>controllers</groupId>
<artifactId>SlidingPuzzle</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>11</source>
<target>11</target>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<javafx.version>13</javafx.version>
</properties>
<dependencies>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-controls</artifactId>
<version>${javafx.version}</version>
</dependency>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-fxml</artifactId>
<version>${javafx.version}</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.26</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.5.7.Final</version>
</dependency>
</dependencies>
</project>
My module-info file:
module SlidingPuzzle {
requires javafx.controls;
requires javafx.fxml;
requires java.persistence;
opens controllers to javafx.fxml;
exports controllers;
}
and my main file where i try too initialize an EntityManger and EntityManagerFactory:
package controllers;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.geometry.Rectangle2D;
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Screen;
import javafx.stage.Stage;
import models.database.User;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
public class Main extends Application {
private static Stage stage;
public static Stage getStage(){
return stage;
}
public static void setStage(Stage stage){
Main.stage = stage;
}
#Override
public void start(Stage primaryStage) throws Exception{
setStage(primaryStage);
FXMLLoader loader = new FXMLLoader();
loader.setLocation(this.getClass().getResource("/views/main.fxml"));
AnchorPane anchorPane = loader.load();
EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("manager1");
EntityManager entityManager = entityManagerFactory.createEntityManager();
EntityTransaction entityTransaction=entityManager.getTransaction();
Scene scene = new Scene(anchorPane,1024,600);
primaryStage.setScene(scene);
primaryStage.setMaximized(true);
primaryStage.setTitle("Sliding Puzzle");
primaryStage.setMinHeight(600);
primaryStage.setMinWidth(1024);
primaryStage.setResizable(true);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
I know that the error leads me to the moment where I try to create an EntityMAnagerFactroy but I don't know why does is show me that. Thanks for any help or a push in the right direction.

You need requires java.sql; in the module-info.java file in order to make use of the features of the java.sql module.
For more information, see a java 9 module tutorial.
There are likely other required modules that you will need to add to your module-info specification in order to get your application to work.

Package not found when create data source using camel

I tried to replicate the same example given in the following question.
import javax.sql.DataSource;
import org.apache.camel.main.Main;
import org.apache.camel.builder.RouteBuilder;
import org.apache.commons.dbcp.BasicDataSource;
public class JDBCExample {
private Main main;
public static void main(String[] args) throws Exception {
JDBCExample example = new JDBCExample();
example.boot();
}
public void boot() throws Exception {
// create a Main instance
main = new Main();
// enable hangup support so you can press ctrl + c to terminate the JVM
main.enableHangupSupport();
String url = "jdbc:oracle:thin:#MYSERVER:1521:myDB";
DataSource dataSource = setupDataSource(url);
// bind dataSource into the registery
main.bind("myDataSource", dataSource);
// add routes
main.addRouteBuilder(new MyRouteBuilder());
// run until you terminate the JVM
System.out.println("Starting Camel. Use ctrl + c to terminate the JVM.\n");
main.run();
}
class MyRouteBuilder extends RouteBuilder {
public void configure() {
String dst = "C:/Local Disk E/TestData/Destination";
from("direct:myTable")
.setBody(constant("select * from myTable"))
.to("jdbc:myDataSource")
.to("file:" + dst);
}
}
private DataSource setupDataSource(String connectURI) {
BasicDataSource ds = new BasicDataSource();
ds.setDriverClassName("oracle.jdbc.driver.OracleDriver");
ds.setUsername("sa");
ds.setPassword("devon1");
ds.setUrl(connectURI);
return ds;
}
}
I have included the camel-jdbc-3.0.1.jar and my db specific jar file in my class path.
When I try to compile the code using the following command
javac -cp .;D:\Code\bin JDBCExample.java
I am getting the following error.
JDBCExample.java:2: error: package org.apache.camel.main does not exist
import org.apache.camel.main.Main;
^
JDBCExample.java:3: error: package org.apache.camel.builder does not exist
import org.apache.camel.builder.RouteBuilder;
^
JDBCExample.java:4: error: package org.apache.commons.dbcp does not exist
import org.apache.commons.dbcp.BasicDataSource;
Where am I going wrong? I tried adding camel-core to the classpath, but it didn't help.
Kindly let me know your thoughts, thanks in advance.

You did well by adding camel-core to your classpath, but camel-core and camel-jdbc do not suffice, you should also add the following dependencies:
JDBCExample.java:2: error: package org.apache.camel.main does not exist
import org.apache.camel.main.Main;
Add camel-main dependency
JDBCExample.java:4: error: package org.apache.commons.dbcp does not exist
import org.apache.commons.dbcp.BasicDataSource;
Add commons-dbcp dependency
JDBCExample.java:3: error: package org.apache.camel.builder does not exist
import org.apache.camel.builder.RouteBuilder;
Add camel-core dependency
With these and the camel-jdbc dependency, you are good to go.
I suggest that you use maven to handle your dependencies (and much more) if you can... If you have not used it before this five minutes quickstart will gently introduce you to it.
Here is a sample pom.xml that resolves all these dependencies correctly
<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>demo</groupId>
<artifactId>camel-jdbc-demo</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>camel-jdbc-demo</name>
<url>http://maven.apache.org</url>
<dependencies>
<!-- https://mvnrepository.com/artifact/commons-dbcp/commons-dbcp -->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.camel/camel-main -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-main</artifactId>
<version>3.0.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.camel/camel-core -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
<version>3.0.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.camel/camel-jdbc -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-jdbc</artifactId>
<version>3.0.1</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>

Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication.Tried all the solution but still not

Console Error
Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication
at com.ayush.JavaApi.main(JavaApi.java:10)
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.SpringApplication
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 1 more
pom.xml
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.ayush</groupId>
<artifactId>JavaCourse</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.1.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
</project>
JavaClass with Main Method
package com.ayush;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class JavaApi {
public static void main(String[] args) {
SpringApplication.run(JavaApi.class,args);
}
}
I am running this program as java application but it is giving me error. i have try all the solution and also provided in the stackoverflow which is updating the maven but it is not working and still giving me the error.
thanks for the help in advance.

I've copied all your files to Intellij but it had no issue with your file.
Maybe hierarchical structure of your project (class JavaApi should be in JavaCourse package) or IDE setting (clean/rebuild, reimport pom) is wrong.
For beginning with Spring boot. You can generate project from https://start.spring.io/

I deleted the Project and created it again .It worked for me .Thanks everyone for the help

Lifecycle exception when deploying example spring boot app

I am trying to understand the basic steps of how to deploy a spring boot application. However, despite the fact that I do everything correctly, I can't deploy it on a tomcat server. The tomcat successfuly extracts my war archive but it gives the folloving below error:
11-Dec-2016 16:49:31.975 SEVERE [localhost-startStop-1] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/springrest]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:752)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:952)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1823)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [org.apache.catalina.webresources.StandardRoot#5a0050e9]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)
at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4842)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4974)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 10 more
Caused by: org.apache.catalina.LifecycleException: Failed to initialize component [org.apache.catalina.webresources.JarResourceSet#57a81b37]
at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:112)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:140)
at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:708)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 13 more
Caused by: java.lang.IllegalArgumentException: java.util.zip.ZipException: invalid END header (bad central directory offset)
at org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.initInternal(AbstractSingleArchiveResourceSet.java:113)
at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:107)
... 16 more
Caused by: java.util.zip.ZipException: invalid END header (bad central directory offset)
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:219)
at java.util.zip.ZipFile.<init>(ZipFile.java:149)
at java.util.jar.JarFile.<init>(JarFile.java:166)
at java.util.jar.JarFile.<init>(JarFile.java:103)
at org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.initInternal(AbstractSingleArchiveResourceSet.java:110)
... 17 more
11-Dec-2016 16:49:31.976 SEVERE [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployWAR Error deploying web application archive /home/bora/Desktop/apache-tomcat-8.5.9/webapps/springrest.war
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/springrest]]
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:756)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:952)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1823)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
I think the error is caused by a ZipException. But I don't understand why. I have followed this and this guides as exactly as it written, but ...
Here is more files, maybe it will be useful:
pom.xml:
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.bora.test</groupId>
<artifactId>springrest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.2.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.jayway.jsonpath</groupId>
<artifactId>json-path</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
<!-- <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> -->
<repositories>
<repository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</pluginRepository>
</pluginRepositories>
</project>
And my Application class:
package com.bora.rest;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.RequestMapping;
#Configuration
#ComponentScan
#EnableAutoConfiguration
public class Application extends SpringBootServletInitializer {
private static Class<Application> applicationClass = Application.class;
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
// TODO Auto-generated method stub
return builder.sources(Application.class);
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
class GreetingController {
#RequestMapping("/")
String hello() {
return "Hello World";
}
}
I compile and package my maven project by givin mvn clean package and coppy the .war file into my tomcat's webapps folder. Restart the tomcat, it extracts but the above error occurs. I have been searching for solution for about 2 hours, but ...
My tomcat version is 8.5.9. I am using Ubuntu 16.04. Environment variables:
$CATALINA_BASE: /home/bora/Desktop/apache-tomcat-8.5.9
$CATALINA_HOME: /home/bora/Desktop/apache-tomcat-8.5.9
$CATALINA_TMPDIR: /home/bora/Desktop/apache-tomcat-8.5.9/temp
$JRE_HOME: /home/bora/Applications/jdk1.8.0_111
$CLASSPATH: /home/bora/Desktop/apache-tomcat-8.5.9/bin/bootstrap.jar:/home/bora/Desktop/apache-tomcat-8.5.9/bin/tomcat-juli.jar
I have strong knowledge about java language, I develop android applications. However, I am totally stranger to Java EE technologies. If someone finds an answer, could you please tell me the answer like you telling a child?
Thank you very much.

Spring-Boot ist using Tomcat 7 as default. This should be the reason why you get an exception. If u want to use Tomcat 8.5.9 u have to set the Version in your pom.xml:
<properties>
<tomcat.version>8.5.9</tomcat.version>
</properties>
EDIT
Use the spring-boot-maven-plugin for building the app. So you cant be sure your app is builded correctly.
EDIT 2
Just annotate your class with #SpringBootApplication this is enough. your Dont need the other ones.
EDIT 3
After compiling your code with my mentioned changes it worket fine. So the issue must be your config. Clear your local maven-repository and redownload the libaries. That should work.

It seems the version conflict, please check compiled version and JVM of Tomcat version are same.
Pls check JAVA_HOME
Check the Tomcat version to build. Follow the link: https://docs.spring.io/spring-boot/docs/current/reference/html/howto-embedded-servlet-containers.html
Check the Java version to build: http://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-build-systems.html
Hope this help.