spring boot 2.0.1 migration issue.

[mkmyla]

After migrating to spring boot 2.0.1 version, i started getting below error

Caused by: java.io.FileNotFoundException: class path resource [org/springframework/boot/web/support/SpringBootServletInitializer.class] cannot be opened because it does not exist

upon checking the issue could be because of wrong import in FF4JWebConfiguration for SpringBootServletInitializer

Is there a version of ff4j compatible with spring boot 2.0.1 I am using latest ff4j version 1.7.1

[paul58914080]

Hello,

This is because SpringBootServletInitializer was moved to a different classpath in spring boot 2.x org.springframework.boot.web.**servlet**.support.SpringBootServletInitializerthan it used to be in spring boot 1.5.x. org.springframework.boot.web.support.SpringBootServletInitializer

As a workaround you could try to have the following dependencies for a spring boot starter parent with version 2.x

<dependency>
   <groupId>org.ff4j</groupId>
   <artifactId>ff4j-spring-boot-web-api</artifactId>
   <version>1.7.1</version>
</dependency>
<dependency>
   <groupId>org.ff4j</groupId>
   <artifactId>ff4j-web</artifactId>
   <version>1.7.1</version>
</dependency>
<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

and the following configuration gist in your project

I have already started upgrading the ff4j-spring-boot-starter to spring boot 2.x and kotlin and should be released as part of 2.0.RC1

[mkmyla]

Thank you for reply. Will wait for 2.0.RC1

[StellaB24]

Hi,
Any ETC for 2.0RC1?
Thanks.

[paul58914080]

Hello,

Mostly I have fixed the broken code

https://github.com/paul58914080/ff4j-spring-boot-starter-parent

I would have to integrate it as part of ff4j version 2.

@clun any thoughts about the 2.0RC1 ?

[jorgerod]

Hello,

Any ETC for 2.0RC1?

Thanks.

[dvelopp]

Hello, any updates on this? Do you support Spring Boot 2 with its SpringBootServletInitializer moved to another package?

[paul58914080]

Started with the movement https://github.com/ff4j/ff4j-spring-boot-starter-parent.

Will try to release a RC (ReleaseCanditate) version within this week.

[xucw]

Hi Paul, any updates on the RC version ? and when will the RC version release? thanks.

[paul58914080]

Planning to release it next week.

[drizztguen77]

I tried following the changes above and explained in gist

The only change I made was I used FF4jDispatcherServlet instead of ConsoleServlet to get the new UI. It starts up fine but when I hit the URL it gets the following exception:

Receiver class org.ff4j.web.thymeleaf.CustomMessageResolver does not define or inherit an implementation of the resolved method abstract resolveMessage(Lorg/thymeleaf/context/ITemplateContext;Ljava/lang/Class;Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String; of interface org.thymeleaf.messageresolver.IMessageResolver.
java.lang.AbstractMethodError: Receiver class org.ff4j.web.thymeleaf.CustomMessageResolver does not define or inherit an implementation of the resolved method abstract resolveMessage(Lorg/thymeleaf/context/ITemplateContext;Ljava/lang/Class;Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String; of interface org.thymeleaf.messageresolver.IMessageResolver.

I have the thymeleaf dependency defined in my pom file.

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

Any ideas what I can do to get this to work?

[paul58914080]

There has been a lot of breaking changes after the updates from spring-boot 2.x.

I have decided that I will be removing the support of auto-configuration of the console(ff4j-web) which uses old dependencies and is causing a lot of conflicts with spring-boot 2.x.

To help you resolve the configuration, I have updated the sample project

In the SpringBootApplication I had to exclude the ThymeleafAutoConfiguration. Refer

@SpringBootApplication(exclude = ThymeleafAutoConfiguration.class)
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

The following dependencies were added explicitly

        <dependency>
            <groupId>org.ff4j</groupId>
            <artifactId>ff4j-web</artifactId>
            <version>1.7.3</version>
        </dependency>
        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf</artifactId>
            <version>2.1.4.RELEASE</version>
        </dependency>

The FF4JWebConfiguration.java

@Configuration
@ConditionalOnClass({ConsoleServlet.class, FF4jDispatcherServlet.class})
@AutoConfigureAfter(FF4JConfiguration.class)
public class FF4JWebConfiguration extends SpringBootServletInitializer {

    @Bean
    public ServletRegistrationBean servletRegistrationBean(ConsoleServlet ff4jConsoleServlet) {
        return new ServletRegistrationBean(ff4jConsoleServlet, "/ff4j-console");
    }

    @Bean
    @ConditionalOnMissingBean
    public ConsoleServlet getFF4jServlet(FF4j ff4j) {
        ConsoleServlet ff4jConsoleServlet = new ConsoleServlet();
        ff4jConsoleServlet.setFf4j(ff4j);
        return ff4jConsoleServlet;
    }

    @Bean
    public ServletRegistrationBean ff4jDispatcherServletRegistrationBean(FF4jDispatcherServlet ff4jDispatcherServlet) {
        return new ServletRegistrationBean(ff4jDispatcherServlet, "/ff4j-web-console/*");
    }

    @Bean
    @ConditionalOnMissingBean
    public FF4jDispatcherServlet getFF4jDispatcherServlet(FF4j ff4j) {
        FF4jDispatcherServlet ff4jConsoleServlet = new FF4jDispatcherServlet();
        ff4jConsoleServlet.setFf4j(ff4j);
        return ff4jConsoleServlet;
    }
}

Let me know if this helps.

[drizztguen77]

That did the trick. I couldn't use ff4j-spring-boot-starter still with spring boot 2 but I did get it working without the starter. Thank you very much for your help.

[paul58914080]

Hello,

Please use the latest release i.e. 1.8.

The sample project has also be updated.

Please note: With the release of 1.8 the support of web console auto-configuration is not supported. How I have demonstrated the usage in the sample

[paul58914080]

Fixed with https://github.com/ff4j/ff4j-spring-boot-starter-parent/releases/tag/1.8