I made my first spring boot application which is working well and I want to deploy it to my VPS server yet there is a problem. I cant run it on command line interface it works fine when I double click.

Commands I have tried so far:

> java -jar jarfilename.jar

> mvn spring-boot:run

> mvnw spring boot:run

non of them worked I would gladly add maven dependency to my pom.xlm but I right now I just want to know how I can learn what command is given when i double click.

both mvn and java commands are defined in path btw

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 https://maven.apache.org/xsd/maven 4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.1.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>name</groupId>
<artifactId>test1</artifactId>
<version>1.0-SNAPSHOT</version>
<name>test1</name>
<description>My personal webpage</description>

<properties>
    <java.version>14</java.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-jasper</artifactId>
        <scope>provided</scope>
    </dependency>

    <dependency>
        <groupId>org.webjars</groupId>
        <artifactId>jquery</artifactId>
        <version>1.9.1</version>
    </dependency>

    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.12</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-mail</artifactId>
        <version>2.2.5.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>4.0.0</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
        <exclusions>
            <exclusion>
                <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

</project>

You should learn the about the process of development of spring boot applications - it will help a lot:

Maven is a build tool that is used to create an application’s jar (a.k.a. Artifact) from your source files. Maven compiles your sources, runs tests you have them, packages the artifact in the target folder which should be created after you run mvn package command.

After that, if the definitions in pom.xml are correct, you will be able to run the following:

cd target

java -jar my-app.jar 

• Here my-app.jar is a name of the artifact that you can find a target folder.

Note that specifically for spring boot applications you should use spring-boot-maven-plugin defined in the pom.xml which looks like you’ve done correctly

So, you are running java 14 bytecode with java8

I think when you double click, system finds appropriate JVM based on the bytecode version.. where when you run from command line, first JVM from path is taken.

Use properties mentioned here https://maven.apache.org/plugins/maven-compiler-plugin/examples/set-compiler-source-and-target.html#

<properties>
    <maven.compiler.target>1.8</maven.compiler.target>
    <maven.compiler.source>1.8</maven.compiler.source>
</properties>

If you want to take it to vps, the best option is either using JAR or war.

Using it with source is obviously not a good way to run on the server.

For creating jar, you can use package target in maven.

for that run mvn package command in the project-root directory.

It will generate the log like below

Look for Building jar: and copy the jar to VPS.

then run java -jar jarfilename.jar

BTW, do you have java 14 on your machine? I think thats the root cause why your build isnt working.

<properties>
    <java.version>14</java.version>
</properties>

Try changing it to older versions, and your build might start working.