Java Spring boot executable JAR file not running into another machine-CodePudding

I am trying to package a Java spring boot (Maven) project into JAR file. So that I can take that JAR file into another computer and simply run it. The file is created inside "target" folder. I can run the project fine with following:

java -jar target/project.jar

but whenever I take the Jar file to another place (like, into another PC) and try to run like this:

java -jar project.jar

it's showing White Label Error 404 page at - localhost:8080

How to package the project to run as standalone JAR file without any such errors?

Here's my application.properties file content:

spring.datasource.url=jdbc:mariadb://localhost:3306/sample
spring.datasource.username=root
spring.datasource.password=****

spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MariaDB103Dialect

spring.jpa.hibernate.ddl-auto=update


## MULTIPART (MultipartProperties)
# Enable multipart uploads
spring.servlet.multipart.enabled=true
# Threshold after which files are written to disk.
spring.servlet.multipart.file-size-threshold=2KB
# Max file size.
spring.servlet.multipart.max-file-size=200MB
# Max Request Size
spring.servlet.multipart.max-request-size=215MB

## File Storage Properties
# All files uploaded through the REST API will be stored in this directory
file.upload-dir=/Users/noticepush/notices

spring.mvc.view.prefix: /WEB-INF/jsp/
spring.mvc.view.suffix: .jsp

And this is my pom.xml content:

<?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>2.6.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.tech</groupId>
    <artifactId>StressDetection</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>
    <name>StressDetection</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mariadb.jdbc</groupId>
            <artifactId>mariadb-java-client</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
        
        <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.2</version>
    </dependency>
        
        <dependency>
   <groupId>com.squareup.okhttp3</groupId>
   <artifactId>okhttp</artifactId>
   <version>4.4.0</version>
</dependency>
        
        <dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>3.0.0</version>
</dependency>

<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.9.2</version>
</dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

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

</project>

Any suggestion for me?
Note: Please don't suggest WAR packaging. I am trying to distribute the project as JAR package.

CodePudding user response：

spring.datasource.url=jdbc:mariadb://localhost:3306/sample Your application has a dependency in some local database.

It can be that in your computer the database exists and is reachable by the application so the application can start and play correctly.

On other computers the database may not exist or may not be reachable from the application so Spring context fails during initialization and therefore the web application is not reachable from you!

If as pointed in comments this is not the issue, then there can be another issue as well.

You can replace the following in your pom.xml

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

with

<build>
    <finalName>${project.artifactId}</finalName>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>repackage</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

So that the final Jar is a repackaged Fat jar which will contain also all runtime dependencies needed.

CodePudding user response：

I get such error in the past You are having this error because there is no defaut webPage for spring boot Screenshot with the error

To fix it , you just need to add a simple html file (index.html) in you src/main/resources/statics directory

CodePudding user response：

The issue is that when you use java -*.jar to deploy any springboot application , the jsp files will not be present in the embedded tomcat and while trying to serve the request you will get a 404 PAGE NOT FOUND. This is because of the jar packaging ,that the jsp files are not getting copied from the WEB-INF folder. If you keep the jsp files under the META-INF/resources folder while using jar as packaging it should work.