无法实例化WebApplicationInitializer类（ReflectionUtils.accessibleConstructor）

Question

早上好

我正在使用 Java 8、Spring 5.3.29 和 Spring Boot 2.7.14 开发 REST API，当我尝试在 Eclipse 中的 Tomcat 9 服务器上启动该应用程序时，遇到了下一个问题：

GRAVE: Error during ServletContainerInitializer processing
javax.servlet.ServletException: Failed to instantiate WebApplicationInitializer class
    at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:160)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4936)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1328)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1318)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:866)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:795)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1328)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1318)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:866)
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:249)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:428)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:922)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:772)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:347)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:478)
Caused by: java.lang.NoSuchMethodError: org.springframework.util.ReflectionUtils.accessibleConstructor(Ljava/lang/Class;[Ljava/lang/Class;)Ljava/lang/reflect/Constructor;
    at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:157)
    ... 29 more

当我调试停止在 SpringServletContainerInitializer.java:157 上时，即：

initializers.add((WebApplicationInitializer)
                                ReflectionUtils.accessibleConstructor(waiClass).newInstance());

waiClass是：类org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration$JerseyWebApplicationInitializer

我的pom.xml是：

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.14</version>
        <relativePath />
    </parent>
    <groupId>es.application</groupId>
    <artifactId>app</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>app</name>
    <packaging>war</packaging>
    <description>Description</description>
    <properties>
        <spring-framework.version>5.3.29</spring-framework.version>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <!-- SPRING BOOT -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <!-- JAXB -->
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-impl</artifactId>
            <version>2.3.8</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-xjc</artifactId>
            <version>2.3.8</version>
        </dependency>
        <dependency>
            <groupId>org.jvnet.jaxb2.maven2</groupId>
            <artifactId>maven-jaxb2-plugin</artifactId>
            <version>0.15.3</version>
        </dependency>
    </dependencies>
    <build>
        <finalName>pid</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

这是我的 Application.java:

@SpringBootApplication
public class Application extends SpringBootServletInitializer{
    
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }
    
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

我能做什么？

谢谢！

Answer 1

解决了！ Apache CXF 将 Spring Core 3.0.7 导出到 Tomcat 服务器的 WEB-INF/lib 文件夹中，并覆盖 Spring Core 5.3.29，后者在 pom.xml 上配置并包含 ReflectionUtils.accessibleConstructor 方法。

解决方案是不要将 Apache CXF 库导出到 WEB-INF/lib 中。所以：

右键Project -> Properties -> Java Build Path -> Apache CXF，去掉将Apache CXF库导出到WEB-INF/lib的选项。

再见！