Maven can't get executable jar: Couldn't load main class - java

You are my last hope. I wrote little bot for telegram. And it's works perfect but i cant build it as an executable jar file. Each time i try to execute jar file at my server i get error:
Error: Could not find or load main class com.praetorian19.MainIni
I understood that i mentioned class path in wrong way. I try mention it in different ways but it's doesn't matter. Error is the same. Please look my MVN project xml and several screenshots from Idea project structure. I think i have an error in pom or in structure.
I try to wrote classpath in many ways. But result the same
I try to build jar at both platforms - Win/Lin, the same
Screenshot from Idea:
Pom:
<modelVersion>4.0.0</modelVersion>
<groupId>praetorian19</groupId>
<artifactId>praetorian19</artifactId>
<version>1.0</version>
<packaging>jar</packaging>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.telegram/telegrambots -->
<dependency>
<groupId>org.telegram</groupId>
<artifactId>telegrambots</artifactId>
<version>4.4.0.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.12.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.12.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-jcl -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-jcl</artifactId>
<version>2.12.1</version>
</dependency>
</dependencies>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<archive>
<manifest>
<mainClass>
com.praetorian19.MainInit
</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
Error: Could not find or load main class com.praetorian19.MainInit
while i try to execute jar at server
Also i try
praetorian19.MainInit
But result the same

The problem is you have defined the main class as com.praetorian19.MainInit in maven-assembly-plugin, which mean the MainInit class supposed to be in the package com.praetorian19.
However when looking into IDEA project structure, your MainInit class in default package, thus it gives error Could not find or load main class com.praetorian19.MainIni, when executing the jar.
To solve this, create a package com.praetorian19 and move your MainInit class into that package with the package declaration as package com.praetorian19;

Related

Make jar of my selenium- Maven project and handover to the stakeholders to execute from their end

I want to export my project to an executable jar with all the dependencies attached
so that any stakeholder can doubleclick on the jar to execute the scripts
in order to achieve I have created a class(Main) file from which I will execute my testng xml file
My pom looks like below where I have provided the main class file in assembly plugin
http://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0
<groupId>SikuliWindowsApp</groupId>
<artifactId>SikuliWindowsApp_V1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>SikuliWindowsApp_V1</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.sikulix</groupId>
<artifactId>sikulixapi</artifactId>
<version>1.1.0</version>
</dependency>
<dependency>
<groupId>com.github.2gis.winium</groupId>
<artifactId>winium-webdriver</artifactId>
<version>0.1.0-1</version>
</dependency>
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4.7</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>SikuliWindowsApp.SikuliWindowsApp_V1.EntryPoint</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
</plugins>
</build>
using assembly command I am able to get the jar file in my target location but if i double click the jar is not getting executed
Unpack the jar (with an unzipping tool) and look for the class EntryPoint. Make sure that the path exactly reflects the packaging (not typos, not upper/lower case, nothing missing).
If the EntryPoint class is not there, check that the source of the class is indeed in src/main/java in your project. You can also check in the target folder for that class.

Converting a regular Maven project to a Spring Boot project

My supervisor asked me to convert an old Maven project we have lying around into a Spring Boot project such that we are able to access the project's backend via RESTful interaction (before that the project's backend was only accessible via a console interface).
So, first I added a simple Spring Boot application in a separate package of project. After that I began to extend the pom.xml of the project by the dependencies needed for Spring Boot and adjusted the overall project setup. Now, I tried to run the backend of the old project, which turned out to be working. However, the simple Spring Boot application did not.
I narrowed down the problem to a conflicting dependency in the "old" part of the pom.xml:
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.6.1</version>
</dependency>
When I leave this dependency in the pom.xml the old backend works, but the Spring Boot application fails with the following error:
WARN: Cannot find template location: classpath:/templates/ (please add some templates or check your Thymeleaf configuration)
If I comment this dependency out the Spring Application works completely fine, but the old backend fails. I use the version 2.0.4.RELEASE of spring-boot-admin-starter-server. I think that the old backend's version of the logging package is different from the one included in spring-boot-admin-starter-server. However, I somehow need both versions in my project.
What's not possible:
Updating the old sources, since some of them have a coyright of an
external company
What I already tried, but I wasn't successful with:
Exclude the logging from then Spring Boot depedencies. This results in the following error:
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
I also to tried to work with the shade plugin as some suggested from my web research. Unfortunately, I was not able to solve the problem with this approach.
Does anyone have suggestions how to solve this problem? I would be very grateful. I am not used to solve dependency problems of this kind. Please excuse me, if I am missing something obvious.
-lema
EDIT pom.xml (unfortunately I had to leave out bigger parts of it) :
<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>
...
<packaging>jar</packaging>
<description></description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-boot-admin.version>2.0.2</spring-boot-admin.version>
<spring-boot-dependencies.version>2.0.4.RELEASE</spring-boot-dependencies.version>
...
<rat.skip>true</rat.skip>
<log4j-version>2.6.1</log4j-version>
</properties>
<repositories>
...
</repositories>
<dependencyManagement>
<dependencies>
<!-- Necessary dependency for running Spring Boot without starter parent -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-releasetrain</artifactId>
<version>Fowler-SR2</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot-dependencies.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
...
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-starter-server</artifactId>
<version>${spring-boot-admin.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
...
<!-- TODO The version of this dependency lets Spring Boot fail, but is
necessary tu run the old backend -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>${log4j-version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>${log4j-version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-iostreams</artifactId>
<version>${log4j-version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-1.2-api</artifactId>
<version>${log4j-version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-jcl</artifactId>
<version>${log4j-version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-jul</artifactId>
<version>${log4j-version}</version>
</dependency>
<dependency>
<groupId>org.fusesource.jansi</groupId>
<artifactId>jansi</artifactId>
<version>1.13</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
</dependency>
...
</dependencies>
<build>
<defaultGoal>verify</defaultGoal>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
...
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.6</version>
<executions>
<execution>
<id>prepare-config-zip</id>
<phase>prepare-package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<descriptors>
<descriptor>${basedir}/src/main/assembly/config.xml</descriptor>
</descriptors>
<finalName>configs</finalName>
<appendAssemblyId>false</appendAssemblyId>
</configuration>
</execution>
<execution>
<id>prepare-dist-zip</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<descriptor>src/main/assembly/dist.xml</descriptor>
<finalName>...</finalName>
<appendAssemblyId>false</appendAssemblyId>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-enforcer-plugin</artifactId>
<configuration>
<rules>
<requireJavaVersion>
<version>1.8</version>
</requireJavaVersion>
</rules>
</configuration>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>attach-standalone</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<configuration>
<shadedArtifactAttached>true</shadedArtifactAttached>
<shadedClassifierName>standalone</shadedClassifierName>
</configuration>
</plugin>
</plugins>
</build>
</profile>
<profile>
<id>dont-attach-standalone</id>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<configuration>
<!-- Prevent huge shaded artifacts from being deployed to Artifactory -->
<outputFile>...</outputFile>
</configuration>
</plugin>
</plugins>
</build>
</profile>
</profiles>
EDIT: I just found out that if you remove the version element inside of the conflicting dependency the Spring Boot Application works, but unfortunately the backend then fails.
So I found a solution, but that's probably not the best way to do it:
I just replaced the <spring-boot-dependencies.version>2.0.4</spring-boot-dependencies.version> with an older version that is compatible with the conflicting logging dependency, namely version 1.4.7.RELEASE.
This is the latest version at which both the Spring Boot application and the backend are working simultaneously (found that out by try-and-error).
Anyway, thank you very much for your help.
Cheers

ClassNotFoundException when running fat JAR configured by spring-boot-maven-plugin

I am trying to create executable JAR file for my spring boot application.
To achieve this spring-boot-maven-plugin has been used with main class specified and packaging to jar.
Unfortunately after running output JAR file i receive java.lang.ClassNotFoundException pointing to my main class.
Below is my pom.xml and main class. Thanks in advance for help.
pom.xml:
<?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>com.test</groupId>
<artifactId>interflight</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>interflight</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath/>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<feign-gson.version>7.2.1</feign-gson.version>
<spring-cloud.version>Edgware.SR1</spring-cloud.version>
<gson.version>2.8.0</gson.version>
<assertj-core.version>3.8.0</assertj-core.version>
<startClass>com.test.interflight.configuration.InterflightApplication</startClass>
</properties>
<dependencies>
<!--External dependencies-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
</dependency>
<dependency>
<groupId>com.netflix.feign</groupId>
<artifactId>feign-gson</artifactId>
<version>${feign-gson.version}</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>${gson.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<!--Test dependencies-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj-core.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<finalName>${project.artifactId}</finalName>
<layout>ZIP</layout>
<mainClass>com.test.interflight.configuration.InterflightApplication</mainClass>
</configuration>
</plugin>
</plugins>
</build>
</project>
Output error:
$ java -jar interflight.jar
Exception in thread "main" java.lang.ClassNotFoundException: com.test.interfl
ight.configuration.InterflightApplication
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(Laun
chedURLClassLoader.java:94)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner
.java:46)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
at org.springframework.boot.loader.PropertiesLauncher.main(PropertiesLau
ncher.java:587)
Main class:
#SpringBootApplication
#ComponentScan(basePackages = {"com.test.interflight.controller", "com.test.interflight.implementation.*"})
#EnableFeignClients(basePackages = {"com.test.interflight.api.restclient"},
defaultConfiguration = FeignConfiguration.class)
public class InterflightApplication {
public static void main(String[] args) {
SpringApplication.run(InterflightApplication.class, args);
}
}
Short answer:
Looks like you're using the ZIP layout when you should be using the JAR layout. Change <layout>ZIP</layout> to <layout>JAR</layout> in your Spring Boot maven plugin declaration.
Longer answer:
Take a look at the docs which describe the ZIP layout as:
ZIP (alias to DIR): similar to the JAR layout using
PropertiesLauncher.
And of which the PropertiesLauncher is described in the docs as:
Launcher for archives with user-configured classpath and main class
via a properties file...
Looks in various places for a properties file to extract loader settings, defaulting to application.properties... No default, but will fall back to looking for a Start-Class in a MANIFEST.MF
If you want it to be user specified in your Jar file, specify (or check and see if you have one already) in the meta-inf folder of your Jar, or specify the property yourself.
After several days dealing with various plugins, finally I could make a fat jar (spring boot) with externalize config files everywhere I wanted to be. You can use the following plugins:"config" is the path for your config files next to the jar file.
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<finalName>jarfilename</finalName>
<mainClass>com.start.YourStarter</mainClass>
<layout>ZIP</layout>
</configuration>
<executions>
<execution>
<phase>install</phase>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<excludes>
<exclude>**/log4j.xml</exclude>
<exclude>deploy/**</exclude>
<exclude>**/*.properties</exclude>
<exclude>**/*.txt</exclude>
</excludes>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.start.YourStarter</mainClass>
<useUniqueVersions>false</useUniqueVersions>
</manifest>
<manifestEntries>
<Class-Path>config/</Class-Path>
</manifestEntries>
</archive>
</configuration>
</plugin>

Keep getting java.lang.NoClassDefFoundError in Spring

I really do not know what is wrong with my Spring configuration. Could you give me hand?
My code (simplified version):
App.java:
public class App {
public static void main(String[] args) {
AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(Config.class);
ctx.close();
}
}
Config.java:
#Configuration
#ComponentScan
public class Config {
#Bean
public JdbcOperations jdbcTemplate(DataSource ds) {
return new JdbcTemplate(ds);
}
}
pom file:
<properties>
<!-- Generic properties -->
<java.version>1.6</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<!-- Spring -->
<spring-framework.version>4.2.5.RELEASE</spring-framework.version>
<!-- Hibernate / JPA -->
<hibernate.version>4.2.1.Final</hibernate.version>
<!-- Logging -->
<logback.version>1.0.13</logback.version>
<slf4j.version>1.7.5</slf4j.version>
<!-- Test -->
<junit.version>4.11</junit.version>
</properties>
<dependencies>
<!-- Spring and Transactions -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring-framework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring-framework.version}</version>
</dependency>
<!-- Logging with SLF4J & LogBack -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
<scope>runtime</scope>
</dependency>
<!-- Hibernate -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${hibernate.version}</version>
</dependency>
<!-- Test Artifacts -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring-framework.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.2.5.RELEASE</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.185</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<!-- Build an executable JAR -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifest>
<mainClass>App</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
My folder structure:
After I maven package it, when I run the jar I got:
Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/context/annotation/AnnotationConfigApplicationContext
at App.main(App.java:10)
Caused by: java.lang.ClassNotFoundException: org.springframework.context.annotation.AnnotationConfigApplicationContext
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
in which, the line 10 is the AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(Config.class);
In addition:
I am writing the code when I was wathcing a spring tutorial:Spring Framework Tutorial 4: Database programming with JdbcTemplate
And his source code is at:github
The only difference with the source code is that I added the MainClass in the pom file.
Thank you so much!
Sincerely
The reason for this is, inside your jar you have only your classes without any dependencies. To include all the dependencies inside your jar you need to create a fat jar.
Replace your build block with following inside pom.xml:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4.1</version>
<configuration>
<!-- get all project dependencies -->
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<!-- MainClass in mainfest make a executable jar -->
<archive>
<manifest>
<mainClass>App</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<!-- bind to the packaging phase -->
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
After running mvn clean package you will get two jar inside your target directory, first one is without dependency and the second one is with dependencies. Run the second jar.
CustomerJdbc-0.0.1-SNAPSHOT.jar
CustomerJdbc-0.0.1-SNAPSHOT-jar-with-dependencies.jar
The reason that you're getting that is because the maven-jar-plugin doesn't actually include any of the JARs that are referenced in the POM file by default.
There are a few ways that you can sort this out, this answer seems pretty comprehensive.
Also note that when referencing the main class in the POM, you need to reference it with the fully qualified class name (net.ubilife.spring.customerjdbc.App).
You can also run it with Shade to build the jar with the dependencies.
Just add "shade:shade" to the goals.
Example:
mvn clean install shade:shade

IKVM jar to dll issues

I'm having hard times trying to convert my .jar library in .dll and make it working by IKVM framework.
I wrote a Java library that works fine since it has been tested succesfully in several java projects, but I strongly need the .dll for .NET.
When I launch the command:
ikvm -jar mylib.jar
everything is ok (I also tried with a Main file to be sure: it works).
But, when I type:
ikvmc -target:library mylib.jar
I got a lot of warnings but still it creates the .dll file. It is important to say that ALL the warnings are related to libraries that I DO NOT use in my project, but I am pretty sure are in the packages I imported in Maven that are essential to me.
I don't know if the true problem is in this step since I read online to ignore those warnings, but to be sure I post a little bit of the output:
warning IKVMC0100: Class "junit.framework.TestCase" not found
warning IKVMC0100: Class "javax.servlet.http.HttpServlet" not found
warning IKVMC0100: Class "javax.servlet.ServletOutputStream" not found
warning IKVMC0100: Class "org.junit.Assert" not found
warning IKVMC0100: Class "junit.framework.TestSuite" not found
warning IKVMC0100: Class "org.apache.tools.ant.taskdefs.MatchingTask" not found
Let us suppose this step is ok, now I have to import the IKVM libraries and the mylib.dll file in the References of my C# app. I did and the outcome is pretty strange: the autocomplete environment suggest me to use only 4 Java classes, ignoring the 99% of the others. I suppose that something went wrong, but it's pretty hard to me understand where and how to fix it.
Just more helpful info: I'm using Maven, Java8 (sdk 1.8) and IKVM 8.
I also tried the same with IKVM 7 and still got the same errors.
In the end, this is my 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>org.fra.mylibrary</groupId>
<artifactId>MyLibrary</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>MYLIBRARY</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<!-- https://mvnrepository.com/artifact/net.sourceforge.owlapi/owlapi-distribution -->
<dependencies>
<!-- https://mvnrepository.com/artifact/net.sourceforge.owlapi/owlapi-distribution -->
<dependency>
<groupId>net.sourceforge.owlapi</groupId>
<artifactId>owlapi-distribution</artifactId>
<version>4.1.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.antlr/antlr4-runtime -->
<dependency>
<groupId>org.antlr</groupId>
<artifactId>antlr4-runtime</artifactId>
<version>4.5.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-simple -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.21</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.codehaus.groovy/groovy-all -->
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<version>2.4.7</version>
</dependency>
<!-- https://mvnrepository.com/artifact/net.sourceforge.owlapi/jfact -->
<dependency>
<groupId>net.sourceforge.owlapi</groupId>
<artifactId>jfact</artifactId>
<version>4.0.4</version>
</dependency>
</dependencies>
<build>
<plugins>
<!-- ANTLR4 -->
<plugin>
<groupId>org.antlr</groupId>
<artifactId>antlr4-maven-plugin</artifactId>
<version>4.5.3</version>
<executions>
<execution>
<goals>
<goal>antlr4</goal>
</goals>
</execution>
</executions>
<configuration>
</configuration>
</plugin>
<!-- Maven Assembly Plugin to create Jar -->
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
<!-- Maven Compiler Plugin -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.0</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
Just remove all code related to latest version of method and classes , and change it to lower version of library of java , may it work , because I have same error like this

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