Keycloak version compatibility issue with springboot

user_5991444 0
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I am integrating keycloak 6.0.1 with springboot version 1.5.4, but I am getting application deployment error as below -

2019-07-01 16:36:19.613  INFO 4920 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Overriding bean definition for bean 'securityProperties' with a different definition: replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration; factoryMethodName=securityProperties; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/security/SecurityAutoConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.security.SecurityFilterAutoConfiguration; factoryMethodName=securityProperties; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/security/SecurityFilterAutoConfiguration.class]]
2019-07-01 16:36:19.789 ERROR 4920 --- [           main] o.s.boot.SpringApplication               : Application startup failed

java.lang.NoClassDefFoundError: org/springframework/boot/web/embedded/undertow/UndertowDeploymentInfoCustomizer
    at java.lang.Class.getDeclaredMethods0(Native Method) ~[na:1.8.0_181]
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) ~[na:1.8.0_181]
    at java.lang.Class.getDeclaredMethods(Class.java:1975) ~[na:1.8.0_181]
    at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:613) ~[spring-core-4.3.9.RELEASE.jar:4.3.9.RELEASE]

Can anyone help me out how to resolve this issue ?

I tried downloading keycloak 3.3.0.final version as suggested by some blog to use with mentioned springboot version, but I could get download link for keycloak 3.3.0 version.

keycloak spring-boot
2 Answers

If you are using keycloak-spring-boot-starter to integrate with keycloak then you need to use Keycloak 4.0.0.Final which supports spring-boot 1.5.2.RELEASE

You can check the dependencies here

With keycloak 6.0.1 supports spring-boot 2.0.3.RELEASE

user_7379360

I was playing around Keycloak last 2 weeks.

I made Keycloak 6.0.1 working with Spring Boot 1.4.1. Just tried your Spring Boot version 1.5.2, looks working.

I did my example based on that repo https://github.com/thomasdarimont/spring-boot-admin-keycloak-example

Removed spring-boot-starter-actuator dependency as don't care about it.

todo-service pom.xml I got is:

<?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.example</groupId>
<artifactId>todo-service</artifactId>
<version>0.1.0-SNAPSHOT</version>
<packaging>jar</packaging>

<name>todo-service</name>
<description>Demo project for Spring Boot</description>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <java.version>1.8</java.version>
    <spring-boot.version>1.5.2.RELEASE</spring-boot.version>
    <lombok.version>1.16.10</lombok.version>
    <keycloak.version>6.0.1</keycloak.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>${spring-boot.version}</version>
        <type>pom</type>
        <scope>import</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
        <version>${spring-boot.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>${spring-boot.version}</version>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-tomcat</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jetty</artifactId>
        <version>${spring-boot.version}</version>
    </dependency>

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

    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>${lombok.version}</version>
        <optional>true</optional>
    </dependency>

</dependencies>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.keycloak.bom</groupId>
            <artifactId>keycloak-adapter-bom</artifactId>
            <version>${keycloak.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>
            <executions>
                <execution>
                    <goals>
                        <goal>build-info</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>
</project>

Play around that repo, update application properties to your keycloak settings, make it working, and do copy necessary dependencies to your original project until you get what you need (what I did for my)

Conclusion: Keycloak 6.0.1 can work with Spring Boot 1.x

user_10514620
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