Run spring-boot application on Liberty Server

Alessandro :

I developed a stand-alone spring boot application that serves a rest service, I've packaged it as a jar and it runs correctly. In order to release it on production server (Websphere), I have to convert it into a war.

I've updated my pom.xml adding these lines:

<properties>
    <maven.compiler.target>1.7</maven.compiler.target>
    <maven.compiler.source>1.7</maven.compiler.source>
</properties>
<packaging>war</packaging>
<build>
    <finalName>${artifactId}</finalName>
</build>

Then, I launched maven clean package and I get the war. So, publishing it on a Tomcat Server works fine, but on Liberty I get the error:

Error 404: SRVE0190E: File not found /

I've also modified my entry point like the following:

@SpringBootApplication
@PropertySource("classpath:alerts.properties")
public class WebApplication extends SpringBootServletInitializer 
{

//  public static void main(String[] args) {
//      SpringApplication.run(WebApplication.class, args);
//  }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(WebApplication.class);
    }
}

With no success, so... how can I run a spring boot war on a Liberty Server?

UPDATE

As @Anjum Fatima suggested, I've also added the features in server.xml

<feature>jsp-2.3</feature>
<feature>springBoot-2.0</feature>
<feature>servlet-3.1</feature>

Before, in that file I've also added:

<library>
    <file id="alerts.properties" name="${shared.resource.dir}/alerts.properties"/>
</library>
<webApplication id="alerts" location="alerts.war" name="alerts">

And in wlp18\usr\shared\resources I've copied the properties file.

But I still have the same error.

The alert.properties file:

spring.datasource.url=jdbc:h2:file:~/alertsdb;DB_CLOSE_ON_EXIT=FALSE;AUTO_RECONNECT=TRUE
spring.datasource.username=admin
spring.datasource.password=mypassword
spring.datasource.driver-class-name=org.h2.Driver

spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update

spring.h2.console.enabled=true
spring.h2.console.settings.web-allow-others=true

spring.mvc.view.prefix: /
spring.mvc.view.suffix: .jsp
spring.messages.basename=validation

UPDATE 2

The server it's almost started, but it can't find some files like com.ibm.ws.kernel.boot.nls_1.0.22.jar, in the Liberty's lib folder there's the file com.ibm.ws.kernel.boot_1.0.22.jar (without .nls) here's the console output, what am I missing?

2020-03-18 13:44:38.950  INFO 34004 --- [ecutor-thread-4] it.mycompany.alerts.WebApplication       : Started WebApplication in 10.915 seconds (JVM running for 24.544)
[WARNING ] The XML schema [web-jsptaglibrary_2_1.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [javaee_5.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [jsp_2_1.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [javaee_web_services_1_2.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [javaee_web_services_client_1_2.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [web-app_3_0.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [web-fragment_3_0.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [web-common_3_0.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [javaee_6.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [jsp_2_2.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [javaee_web_services_1_3.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [javaee_web_services_client_1_3.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [web-app_3_1.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [web-fragment_3_1.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [web-common_3_1.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [javaee_7.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [javaee_web_services_1_4.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [javaee_web_services_client_1_4.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [web-app_4_0.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [web-fragment_4_0.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [web-common_4_0.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] The XML schema [javaee_8.xsd] could not be found. This is very likely to break XML validation if XML validation is enabled.
[WARNING ] Failed to scan [file:/C:/lang/appserver/wlp/wlp18/lib/com.ibm.ws.kernel.boot.nls_1.0.22.jar] from classloader hierarchy
C:\lang\appserver\wlp\wlp18\lib\com.ibm.ws.kernel.boot.nls_1.0.22.jar (File not found)

Thank you

Alessandro :

Finally it works, I started with a new project. Here the pom.xml (with liberty-maven-plugin):

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.5.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <groupId>it.mycompany</groupId>
    <artifactId>alerts</artifactId>
    <version>1.0-SNAPSHOT</version>

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

    <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.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>com.ibm.mq</groupId>
            <artifactId>com.ibm.mq.allclient</artifactId>
            <version>9.1.4.0</version>
        </dependency>
    </dependencies>

    <packaging>war</packaging>

    <build>
        <finalName>${artifactId}</finalName>
        <plugins>
            <plugin>
                <groupId>io.openliberty.tools</groupId>
                <artifactId>liberty-maven-plugin</artifactId>
                <version>3.2</version>
                <configuration>
                    <appsDirectory>apps</appsDirectory>
                    <mainClass>${start-class}</mainClass>
                </configuration>
            </plugin> 
        </plugins>
    </build>
</project>

The entry point class:

@SpringBootApplication
@PropertySource("classpath:alerts.properties")
public class WebApplication extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(WebApplication.class);
    }
}

I created the WAR with mvn clean install then I copied it from the target dir to wlp/servers/myserver/apps (not dropins)

Finally I set the server.xml as the following:

<server description="Tester">
    <featureManager>
        <feature>servlet-4.0</feature>
        <feature>localConnector-1.0</feature>
        <feature>jsp-2.3</feature>
        <feature>springBoot-2.0</feature>
    </featureManager>

    <httpEndpoint host="*" httpPort="9080" httpsPort="9443"
        id="defaultHttpEndpoint" />

    <library>
        <file id="alerts.properties"
            name="${shared.resource.dir}/alerts.properties" />
    </library>
    <webApplication id="alerts" location="alerts.war"
        name="alerts" contextRoot="/" />
</server>

The Liberty Server starts fine, the application works, the only problem is that responds to localhost:9080/login and not to localhost:9080/alerts/login. However the goal of the question is achieved, I've created a war file and it runs on a Liberty Server.

Thanks to all and especially thanks to @ScottKurz and @Anjum Fatima.