Spring Gateway deployment on external tomcat - spring

Question

I am developing a micro-service solution with spring boot. I have 3 micro services:
authentication services (manages users, roles, permissions)
project service (services used to do CRUD actions on Project entity)
gateway (used as entry point of the solution, also used to validate token and route to services)
I want to deploy these on a tomcat server as war placed in the webapps (knowing that they have an embedded tomcat).
I am able to deploy the authentication and project services and they are reachable over the URI ** localhost:8080/authentication/* ** and ** /project/* *, but I'm unable to reach the gateway on ** localhost:8080/gateway/ **, it returns a 404
I am sure that the gateway is running cause it created the tables in the DB after deployment.
**Knowing that in eclipse it works fine (since i run each service on a port specified in the application.yml) i don't understand why when deploying the gateway on tomcat it is unreachable and always return a 404. I can see it in the tomcat manager as deployed.
Here is the pom.xml of the gateway :
<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>2.4.1</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.myProject</groupId>
<artifactId>gateway</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>gateway</name>
<description>Gateway</description>
<profiles>
<profile>
<id>dev</id>
<properties>
<activatedProperties>dev</activatedProperties>
</properties>
</profile>
</profiles>
<properties>
<java.version>11</java.version>
<springfox-swagger.version>3.0.0</springfox-swagger.version>
</properties>
<dependencies>
<dependency>
<groupId>com.nimbusds</groupId>
<artifactId>nimbus-jose-jwt</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.oracle.database.jdbc</groupId>
<artifactId>ojdbc8</artifactId>
<version>21.1.0.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-gateway</artifactId>
<version>3.0.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<skipTests>true</skipTests>
</configuration>
</plugin>
</plugins>
</build>
</project>
and here is my application.yml file :
spring:
cloud:
gateway:
routes:
- id: incident
uri: http://localhost:8080/project
predicates:
- Path=/gateway/v1/project/**
filters:
- RewritePath=/gateway/(?<RID>.*), /$\{RID}
- JwtFilter
- RemoveRequestHeader=Authorization
- id: authentication
uri: http://localhost:8080/auth
predicates:
- Path=/gateway/auth/**
filters:
- RewritePath=/gateway/(?<RID>.*), /$\{RID}
- id: userManagement
uri: http://localhost:8080/auth
predicates:
- Path=/gateway/v1/user/**,/gateway/v1/permission/**,/gateway/v1/role/**,/gateway/v1/role-permission/**,/gateway/v1/user-role/**
filters:
- RewritePath=/gateway/(?<RID>.*), /$\{RID}
- JwtFilter
- RemoveRequestHeader=Authorization
datasource:
url: jdbc:oracle:thin:#//xxx.xxx.xxx.xxx:1521/ORCLCDB.localdomain
username: xxx
password: xxx
jpa:
hibernate:
ddl-auto: update
id:
new_generator_mappings=true
properties:
hibernate:
temp:
use_jdbc_metadata_defaults: false
dialect: org.hibernate.dialect.Oracle12cDialect
physical_naming_strategy: org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
show-sql: true
logging:
level:
org.springframework: TRACE
org.hibernate.type: TRACE
org.apache.tomcat: INFO
org.apache.catalina: INFO
pattern:
console: "%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"
file: "%d %p %c{1.} [%t] %m%n"
file:
name: ./tomcat-logs/gateway
path: ./tomcat-logs/gateway

Answer 1

Spring Cloud Gateway is itself a Spring Boot WebFlux application. It's support only embedded server. Please check spring documentation
https://docs.spring.io/spring-boot/docs/current/reference/html/howto.html#howto-traditional-deployment