下面是部署war文件时的错误

12:35:32,542 ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 95) MSC000001: Failed to start service

jboss.undertow.deployment.default server.default host./demo:org.jboss.msc.service.startexception in service jboss.undertow.deployment.default server.default host./demo:java.lang.nosuchmethoderror:org.apache.tomcat.util.descriptor.digesterfactory.newdigester（zzlorg/apache/tomcat/util/digester/ruleset；z） lorg/apache/tomcat/util/digester/digester；在org.wildfly.extension.undertow.deployment.undertowdeploymentservice$1.run（undertowdeploymentservice。java:81)在java.util.concurrent.executors$runnableadapter.call（executors。java:511)在java.util.concurrent.futuretask.run（futuretask。java:266)在org.jboss.threads.contextclassloadersavingrunnable.run（contextclassloadersavingrunnable。java:35)在org.jboss.threads.enhancedqueueexecutor.saferun（enhancedqueueexecutor。java:1985)在org.jboss.threads.enhancedqueueexecutor$threadbody.doruntask（enhancedqueueexecutor。java:1487)在org.jboss.threads.enhancedqueueexecutor$threadbody.run（enhancedqueueexecutor。java:1378)在java.lang.thread.run（线程。java:748)在org.jboss.threads.jbossthread.run（jbossthread。java:485)原因：java.lang.nosuchmethoderror:org.apache.tomcat.util.descriptor.digesterfactory.newdigester（zzlorg/apache/tomcat/util/digester/ruleset；z） lorg/apache/tomcat/util/digester/digester；在org.apache.tomcat.util.descriptor.tld.tldparser。java:49)在org.apache.tomcat.util.descriptor.tld.tldparser。java:44)在org.apache.jasper.servlet.tldscanner。java:84)位于org.apache.jasper.servlet.jasperinitializer.newtldscanner（jasperinitializer.html）。java:100)在org.apache.jasper.servlet.jasperinitializer.onstartup（jasperinitializer。java:81)在io.undertow.servlet.core.deploymentmanagerimpl$1.call（deploymentmanagerimpl。java:202)在io.undertow.servlet.core.deploymentmanagerimpl$1.call（deploymentmanagerimpl。java:184)在io.undertow.servlet.core.servletrequestcontextthreadsetupaction$1.call（servletrequestcontextthreadsetupaction）。java:42)在io.undertow.servlet.core.contextclassloadersetupaction$1.call（contextclassloadersetupaction。java:43)在org.wildfly.extension.undertow.security.securitycontextthreadsetupaction.lambda$create$0（securitycontextthreadsetupaction）。java:105)位于org.wildfly.extension.undertow.deployment.undertowdeploymentinfoservice$undertowthreadsetupaction.lambda$create$0（undertowdeploymentinfoservice）。java:1526)在org.wildfly.extension.undertow.deployment.undertowdeploymentinfoservice$undertowthreadsetupaction.lambda$创建$0（undertowdeploymentinfoservice）。java:1526)位于org.wildfly.extension.undertow.deployment.undertowdeploymentinfoservice$undertowthreadsetupaction.lambda$create$0（undertowdeploymentinfoservice）。java:1526)在org.wildfly.extension.undertow.deployment.undertowdeploymentinfoservice$undertowthreadsetupaction.lambda$创建$0（undertowdeploymentinfoservice）。java:1526)位于org.wildfly.extension.undertow.deployment.undertowdeploymentinfoservice$undertowthreadsetupaction.lambda$create$0（undertowdeploymentinfoservice）。java:1526)在io.undertow.servlet.core.deploymentmanagerimpl.deploy（deploymentmanagerimpl。java:249)在org.wildfly.extension.undertow.deployment.undertowdeploymentservice.startcontext（undertowdeploymentservice。java:96)在org.wildfly.extension.undertow.deployment.undertowdeploymentservice$1.run（undertowdeploymentservice。java:78) ... 8个以上

12:35:32,546 ERROR [org.jboss.as.controller.management-operation] (DeploymentScanner-threads - 2) WFLYCTL0013: Operation

（“完全替换部署”）失败-地址：（[]）-失败描述：{“wflyctl0080:失败的服务”=>{“jboss.undertow.deployment.default server.default host./demo”=>“java.lang.nosuchmethoderror:org.apache.tomcat.util.descriptor.digesterfactory.newdigester（zzlorg/apache/tomcat/util/digester/ruleset；z） lorg/apache/tomcat/util/digester/digester；原因：java.lang.nosuchmethoderror:org.apache.tomcat.util.descriptor.digesterfactory.newdigester（zzlorg/apache/tomcat/util/digester/ruleset；z） lorg/apache/tomcat/util/digester/digester；“}}12:35:32622 info[org.jboss.as.server]（deploymentscanner threads-2）wflysrv0016:将部署“demo.war”替换为部署“demo.war”12:35:32，623 info[org.jboss.as.controller]（deploymentscanner threads-2）wflyctl0183:服务状态报告wflyctl0186:无法启动的服务：service jboss.undertow.deployment.default server.default host./demo:java.lang.nosuchmethoderror:org.apache.tomcat.util.descriptor.digesterfactory.newdigester（org/apache/tomcat/util/digester/ruleset；z） lorg/apache/tomcat/util/digester/digester；

12:35:32,625 INFO  [org.jboss.as.repository] (DeploymentScanner-threads - 2) WFLYDR0002: Content removed from

location/home/sahil/downloads/wildfly-12.0.0.final/standalone/data/content/d6/969c28745ca207cb6683a8ef32d29850ebaa96/content
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 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>2.2.6.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ststech</groupId>
    <artifactId>UserRegistration</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>UserRegistration</name>
    <description>Simple WebApp Project for login and Signup</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- <dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> 
            <scope>runtime</scope> </dependency> -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- <dependency> <groupId>org.apache.tomcat</groupId> <artifactId>tomcat-jasper</artifactId> 
            <version>9.0.33</version> </dependency> -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <!-- <version>9.0.33</version> -->
        </dependency>
        <dependency>
            <groupId>org.springframework.session</groupId>
            <artifactId>spring-session-core</artifactId>
        </dependency>
        <!-- New Dependencies add -->
        <!-- <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> 
            <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> 
            </exclusion> </exclusions> </dependency> -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>
        <!-- End -->
        <!-- https://mvnrepository.com/artifact/commons-digester/commons-digester -->
<dependency>
    <groupId>commons-digester</groupId>
    <artifactId>commons-digester</artifactId>
    <version>2.1</version>
</dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <!-- Exclude Spring Boot's Default Logging -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>ch.qos.logback</groupId>
                    <artifactId>logback-classic</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- Add Log4j2 Dependency -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>
    </dependencies>
    <build>
        <finalName>Demo</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>