如何解决 java.lang.NoClassDefFoundError: com/google/api/client/repackaged/com/google/common/base/Strings答案

【问题标题】：How to resolve java.lang.NoClassDefFoundError: com/google/api/client/repackaged/com/google/common/base/Strings如何解决 java.lang.NoClassDefFoundError: com/google/api/client/repackaged/com/google/common/base/Strings
【发布时间】：2023-03-05 13:28:01
【问题描述】：

我在 StackOverflow 上搜索了类似的问题，但找不到任何东西。

我的pom.xml 文件：

<?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.stackoverflow.example</groupId>
    <artifactId>dmytro-camel-demo</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
    </parent>

    <properties>
        <jdk.version>1.8</jdk.version>
        <kotlin.version>1.3.31</kotlin.version>
        <camel.version>2.23.1</camel.version>
        <spring-boot.version>2.1.4.RELEASE</spring-boot.version>
        <google-cloud.version>1.92.0</google-cloud.version>
        <google-firestore.version>1.22.0</google-firestore.version>

        <javax-jaxb.version>2.2.11</javax-jaxb.version>
        <javax-activation.version>1.1.1</javax-activation.version>
    </properties>

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

        <!-- Kotlin -->
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-stdlib-jdk8</artifactId>
        </dependency>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-reflect</artifactId>
        </dependency>

        <!-- Camel -->
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-spring-boot-starter</artifactId>
            <version>${camel.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-google-pubsub-starter</artifactId>
            <version>${camel.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-zipfile</artifactId>
            <version>${camel.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-http</artifactId>
            <version>${camel.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jetty</artifactId>
            <version>${camel.version}</version>
        </dependency>

        <!-- GCP -->
        <dependency>
            <groupId>com.google.cloud</groupId>
            <artifactId>google-cloud-storage</artifactId>
            <version>${google-cloud.version}</version>
        </dependency>
        <dependency>
            <groupId>com.google.cloud</groupId>
            <artifactId>google-cloud-firestore</artifactId>
            <version>${google-firestore.version}</version>
        </dependency>

        <!-- JDK >=10 doesn't bundle JAXB -->
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>${javax-jaxb.version}</version>
        </dependency>
        <dependency>
            <groupId>javax.activation</groupId>
            <artifactId>activation</artifactId>
            <version>${javax-activation.version}</version>
        </dependency>

        <!-- Test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring-boot.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.jetbrains.kotlin</groupId>
                <artifactId>kotlin-maven-plugin</artifactId>
                <version>${kotlin.version}</version>

                <configuration>
                    <args>
                        <arg>-java-parameters</arg>
                    </args>
                    <compilerPlugins>
                        <!-- Spring compiler plugin will automatically open relevant classes and members for Spring AOP support. See https://kotlinlang.org/docs/reference/compiler-plugins.html -->
                        <plugin>spring</plugin>
                    </compilerPlugins>
                    <jvmTarget>${jdk.version}</jvmTarget>
                </configuration>

                <executions>
                    <execution>
                        <id>compile</id>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                        <configuration>
                            <sourceDirs>
                                <sourceDir>${project.basedir}/src/main/kotlin</sourceDir>
                            </sourceDirs>
                        </configuration>
                    </execution>
                    <execution>
                        <id>test-compile</id>
                        <goals>
                            <goal>test-compile</goal>
                        </goals>
                        <configuration>
                            <sourceDirs>
                                <sourceDir>${project.basedir}/src/test/kotlin</sourceDir>
                            </sourceDirs>
                        </configuration>
                    </execution>
                </executions>

                <!-- Needed by the Spring compiler plugin. -->
                <dependencies>
                    <dependency>
                        <groupId>org.jetbrains.kotlin</groupId>
                        <artifactId>kotlin-maven-allopen</artifactId>
                        <version>${kotlin.version}</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
    <profiles>
        <profile>
            <id>ci</id>

            <properties>
                <revision>0.0.1-SNAPSHOT</revision>
            </properties>
        </profile>
    </profiles>
</project>

我收到以下错误：

java.lang.NoClassDefFoundError: com/google/api/client/repackaged/com/google/common/base/Strings 在 org.apache.camel.component.google.pubsub.GooglePubsubEndpoint.afterPropertiesSet(GooglePubsubEndpoint.java:87) ~[camel-google-pubsub-2.23.1.jar:2.23.1] 在 org.apache.camel.component.google.pubsub.GooglePubsubEndpoint.createConsumer(GooglePubsubEndpoint.java:109) ~[camel-google-pubsub-2.23.1.jar:2.23.1] 在 org.apache.camel.impl.EventDrivenConsumerRoute.addServices(EventDrivenConsumerRoute.java:69) ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.impl.DefaultRoute.onStartingServices(DefaultRoute.java:107) ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.impl.RouteService.doWarmUp(RouteService.java:172) ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.impl.RouteService.warmUp(RouteService.java:145) ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.impl.DefaultCamelContext.doWarmUpRoutes(DefaultCamelContext.java:3953) ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.impl.DefaultCamelContext.safelyStartRouteServices(DefaultCamelContext.java:3860) ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.impl.DefaultCamelContext.doStartOrResumeRoutes(DefaultCamelContext.java:3646) ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.impl.DefaultCamelContext.doStartCamel（DefaultCamelContext.java:3489） ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.impl.DefaultCamelContext$4.call(DefaultCamelContext.java:3248) ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.impl.DefaultCamelContext$4.call(DefaultCamelContext.java:3244) ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.impl.DefaultCamelContext.doWithDefinedClassLoader(DefaultCamelContext.java:3267) ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.impl.DefaultCamelContext.doStart(DefaultCamelContext.java:3244) ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:72) ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.impl.DefaultCamelContext.start(DefaultCamelContext.java:3160) ~[camel-core-2.23.1.jar:2.23.1] 在 org.apache.camel.spring.SpringCamelContext.start(SpringCamelContext.java:133) 〜[骆驼弹簧2.23.1.jar：2.23.1]在 org.apache.camel.spring.SpringCamelContext.onApplicationEvent(SpringCamelContext.java:174) 〜[骆驼弹簧2.23.1.jar：2.23.1]在 org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:402) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:359) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:896) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:163) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE] 在 org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:552) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE] 在 org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE] 在 org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE] 在 org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE] 在 org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE] 在 org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE] 在 com.stackoverflow.example.ExampleAppKt.main(ExampleApp.kt:13) [classes/:na] 引起：java.lang.ClassNotFoundException： com.google.api.client.repackaged.com.google.common.base.Strings 在 java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[na:1.8.0_202-release] 在 java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_202-release] 在 sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[na:1.8.0_202-release] 在 java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_202-release] ...省略了33个常用框架

如何解决？我做错什么了吗？

【问题讨论】：

大多数这种类型的问题似乎都指向正在被拉下的番石榴版本......做一个 mvn 依赖：树看看是否存在依赖冲突或只是尝试添加番石榴依赖项（21.0），看看它是否解决了你的问题..
你可以尝试删除 ${camel.version} 。其实spring boot很聪明，可以自动配置版本。
@AvijitBarua 它没有帮助，因为如果我删除它，则根本无法解决依赖关系。
@DmytroChasovskyi 你能把版本<camel.version>2.23.1</camel.version>替换成<version>2.17.0</version>吗？
@AvijitBarua pubsub-starter 是在 2.19.2 版本中添加的，所以我不能使用 2.17.0。我将骆驼降级到 2.19.2 但没有帮助。

标签： java maven spring-boot kotlin apache-camel

【解决方案1】：

尝试添加 Guava 依赖项。

<dependency>
    <groupId>com.google</groupId>
    <artifactId>guava</artifactId>
    <version>18.0</version>
</dependency>

这可能会解决问题。

【讨论】：

【解决方案2】：

我已经写了pom.xml，如下所示

<?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 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>2.1.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </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-test</artifactId>
            <scope>test</scope>
        </dependency>


        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-stdlib-jdk8</artifactId>
        </dependency>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-reflect</artifactId>
        </dependency>

        <!-- Camel -->

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


        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-google-pubsub-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-zipfile</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-http</artifactId>
            <version>2.23.1</version>
        </dependency>


        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jetty</artifactId>
            <version>2.23.1</version>
        </dependency>

        <!-- GCP -->
        <dependency>
            <groupId>com.google.cloud</groupId>
            <artifactId>google-cloud-storage</artifactId>
            <version>1.86.0</version>
        </dependency>


        <dependency>
            <groupId>com.google.cloud</groupId>
            <artifactId>google-cloud-firestore</artifactId>
            <version>1.17.0</version>
        </dependency>


        <dependency>
            <groupId>javax.activation</groupId>
            <artifactId>activation</artifactId>
        </dependency>

        <!-- Test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

项目运行良好。请检查一下好吗？

【讨论】：

它本身并没有解决我的问题，但它有助于调试它并解决了我 90% 的问题。
@DmytroChasovskyi 会很有用，如果你记得你是如何解决这个问题的。我正在为此苦苦挣扎，这似乎是一个悬而未决的问题github.com/awslabs/rds-data-api-client-library-java/issues/5
@TheAshwaniK 我认为我的一位同事创建了最后包含缺失位的包。理想情况下，如果您遇到此类错误，请升级到 Camel 3.XX 如果这些都不适合您，另一种选择是降级到包含此软件包的版本（如果您关心安全性，这可能是最糟糕的解决方案并且知道包中存在的漏洞）。