如何在 Spring 中防止所有 Jackson 自动配置？

【问题标题】：How to prevent ALL of Jackson auto-config in Spring?如何在 Spring 中防止所有 Jackson 自动配置？
【发布时间】：2018-05-14 15:35:21
【问题描述】：

上下文

我有一种情况，我无法控制应用程序的main，也无法控制类路径上的库。我正在扩展（通过插件 API）现有的 Swing 应用程序。我的项目的目标是通过 HTTP API 使遗留应用程序内部的信息可用，然后通过 Web 应用程序进行接口。

技术情况

有问题的应用程序已经 Jackson 在版本 2.7 的类路径中。我正在尝试使用 Spring Boot 版本 2，它是针对 Jackson 2.8 构建的。当我启动服务器时，Spring 无法初始化，因为它正在尝试使用 2.7 中不存在的类和方法来配置 Jackson 东西。

我想做的是防止 Spring自动配置任何与Jackson相关的东西，让我提供我自己的内容协商者。

我已经试过了

@SpringBootApplication(
    exclude = arrayOf(JacksonAutoConfiguration::class)
)

但它不起作用。

深入 Spring 代码，我看到它在 AllEncompassingFormHttpMessageConverter 内部硬编码的地方，即 Jackson 在类路径上，它应该创建新对象（这会导致有问题的异常），尽管我在我的 Spring Boot 应用程序中排除了 Jackson 配置。

private static final boolean jackson2Present =
        ClassUtils.isPresent("com.fasterxml.jackson.databind.ObjectMapper", AllEncompassingFormHttpMessageConverter.class.getClassLoader()) &&
                ClassUtils.isPresent("com.fasterxml.jackson.core.JsonGenerator", AllEncompassingFormHttpMessageConverter.class.getClassLoader());

然后：

    if (jackson2Present) {
        addPartConverter(new MappingJackson2HttpMessageConverter());
    }

现在的项目

这里是 GitHub 的链接，指向正确的分支。

https://github.com/Adeynack/finances/tree/spring--jackson-init-bypass/backend

处于这种状态的项目会导致错误。运行./gradlew server-standalone:run。

完整的错误日志

我得到的错误如下：

2017-11-30 17:15:54,475 | ERROR | main                                 | o.springframework.boot.SpringApplication | Application startup failed
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:137)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:122)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:386)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:327)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1245)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1233)
    at com.github.adeynack.finances.backend.serverStandalone.FinancesServerStandalone.main(FinancesServerStandalone.kt:10)
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:114)
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:81)
    at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:527)
    at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:185)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:161)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:134)
    ... 8 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'httpPutFormContentFilter' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.web.servlet.filter.OrderedHttpPutFormContentFilter]: Factory method 'httpPutFormContentFilter' threw exception; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:583)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1249)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1098)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
    at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$83/517355658.getObject(Unknown Source)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:205)
    at org.springframework.boot.web.servlet.ServletContextInitializerBeans.getOrderedBeansOfType(ServletContextInitializerBeans.java:228)
    at org.springframework.boot.web.servlet.ServletContextInitializerBeans.addAsRegistrationBean(ServletContextInitializerBeans.java:182)
    at org.springframework.boot.web.servlet.ServletContextInitializerBeans.addAsRegistrationBean(ServletContextInitializerBeans.java:177)
    at org.springframework.boot.web.servlet.ServletContextInitializerBeans.addAdaptableBeans(ServletContextInitializerBeans.java:159)
    at org.springframework.boot.web.servlet.ServletContextInitializerBeans.<init>(ServletContextInitializerBeans.java:80)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getServletContextInitializerBeans(ServletWebServerApplicationContext.java:232)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.selfInitialize(ServletWebServerApplicationContext.java:219)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext$$Lambda$126/1009916891.onStartup(Unknown Source)
    at org.springframework.boot.web.embedded.tomcat.TomcatStarter.onStartup(TomcatStarter.java:54)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5196)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.web.servlet.filter.OrderedHttpPutFormContentFilter]: Factory method 'httpPutFormContentFilter' threw exception; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:186)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:575)
    ... 26 common frames omitted
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException
    at org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter.<init>(AllEncompassingFormHttpMessageConverter.java:67)
    at org.springframework.web.filter.HttpPutFormContentFilter.<init>(HttpPutFormContentFilter.java:63)
    at org.springframework.boot.web.servlet.filter.OrderedHttpPutFormContentFilter.<init>(OrderedHttpPutFormContentFilter.java:29)
    at org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration.httpPutFormContentFilter(WebMvcAutoConfiguration.java:161)
    at org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$$EnhancerBySpringCGLIB$$f9ae12ce.CGLIB$httpPutFormContentFilter$1(<generated>)
    at org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$$EnhancerBySpringCGLIB$$f9ae12ce$$FastClassBySpringCGLIB$$60a40e61.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:361)
    at org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$$EnhancerBySpringCGLIB$$f9ae12ce.httpPutFormContentFilter(<generated>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:155)
    ... 27 common frames omitted
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.exc.InvalidDefinitionException
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 41 common frames omitted

Gradle 文件

我能够使用这个 Gradle 构建文件重新创建这种情况的条件。

buildscript {

    ext {
        kotlin_version = '1.1.51'
        spring_boot_version = '2.0.0.M5'
        junit_version = '5.0.1'
        jackson_version = '2.7.9' // has to match Moneydance included Jackson version
    }

    repositories {
        mavenCentral()
        jcenter()
        maven { url 'https://repo.spring.io/libs-milestone' } // remove when using a stable version of Spring Boot 2.x
    }
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'org.junit.platform:junit-platform-gradle-plugin:1.0.1'
        classpath "org.springframework.boot:spring-boot-gradle-plugin:$spring_boot_version"
    }
}

subprojects {

    apply plugin: 'java'
    apply plugin: 'kotlin'
    apply plugin: 'idea'
    apply plugin: 'org.junit.platform.gradle.plugin'
//    apply plugin: 'org.springframework.boot' // causes problems with Spring Boot 2. Unable to compile sub-projects.
    apply plugin: 'io.spring.dependency-management'

    sourceCompatibility = JavaVersion.VERSION_1_8
    targetCompatibility = JavaVersion.VERSION_1_8

    repositories {
        mavenCentral()
        jcenter()
        maven { url 'https://repo.spring.io/libs-milestone' }
    }

    dependencies {

        //
        // PRODUCTION
        //

        // Kotlin and language extensions
        compile "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"
        compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"

        // Spring
        compile("org.springframework.boot:spring-boot-starter-web:$spring_boot_version") {
            // Totally excluding Jackson (version conflict between version included in Moneydance and the one used in SpringBoot
            exclude group: 'com.fasterxml.jackson.core'
            exclude group: 'com.fasterxml.jackson.datatype'
            exclude group: 'com.fasterxml.jackson.module'
        }

        compile "com.fasterxml.jackson.module:jackson-module-kotlin:$jackson_version"

        //
        // TEST
        //

        // JUnit
        testCompile("org.junit.jupiter:junit-jupiter-api:$junit_version")
        testRuntime("org.junit.jupiter:junit-jupiter-engine:$junit_version")

    }

    compileKotlin {
        kotlinOptions {
            jvmTarget = JavaVersion.VERSION_1_8
        }
    }

    compileTestKotlin {
        kotlinOptions {
            jvmTarget = JavaVersion.VERSION_1_8
        }
    }

    junitPlatform {
        platformVersion '1.0.0'
    }

}

【问题讨论】：

  • 不要排除Jackson自动配置，而是尝试在类路径中添加更新版本的Jackson库
  • 您使用的是什么构建工具，是否可以包含相关的配置文件（例如pom.xml）？
  • 我认为在 pom.xml 中指定所需的依赖项将覆盖 Spring Boot 的默认 jackson 依赖项。
  • @er-han ：在我的插件的 fat-JAR 中有一个较新版本的 Jackson，它最终出现在类路径中。但显然，由于这些类已经在类路径中，因此不使用“第二个要加载的类”。
  • @AmitKBist ：我在原始帖子的末尾添加了 Gradle 构建文件。

标签： java spring spring-mvc spring-boot jackson2


【解决方案1】：

导致异常的未找到类是InvalidDefinitionException

嵌套异常是 java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException

我发现 InvalidDefinitionException 类自 2.9 以来在 Jackson 中存在，如您在此处看到的：InvalidDefinitionException

所以我将build.gradle中的jackson_version值更改为2.9.2（latest），并尝试按照您的描述运行项目，项目开始运行，无一例外。

现在排除 Jackson 你仍然可以使用这个：

@SpringBootApplication(
    exclude = arrayOf(JacksonAutoConfiguration::class)
)

【讨论】：

  • 如最初的问题所述：我无法控制运行时使用的 Jackson 版本。它是2.7，因为它已经在类路径中。
  • 我的目标是告诉 Spring 不要自动配置 Jackson 内容协商器，让我手动提供一个。
  • 这适用于单机服务器，仅用于测试。真正的最终产品在 Moneydance 内部运行，这是我无法控制的应用程序，主路径和类路径（其中 Jackson 2.7 已经存在）。跨度>
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