如何解決tomcat的問題？ Spring-Boot“掃描失敗”

Question

這是我的第一個 spring-boot 項目，我在使用 tomcat 時遇到了問題。 服務器不想啟動。 項目中沒有使用玻璃魚，這個消息我越發驚訝。 該項目是在 Maven 中創建的。 我已經坐了好幾個小時了，但我找不到問題所在。 任何人都可以幫助我嗎？

2019-12-11 16:21:30.775  WARN 10436 --- [           main]         o.a.tomcat.util.scan.StandardJarScanner  : Failed to scan [file:/C:/Users/maxwell/.m2/repository/org/glassfish/hk2/hk2/2.6.1/hk2-utils.jar] from classloader hierarchy

java.io.IOException: java.lang.reflect.InvocationTargetException
  at org.apache.tomcat.util.compat.Jre9Compat.jarFileNewInstance(Jre9Compat.java:236) ~[tomcat-embed-core-9.0.29.jar:9.0.29]

這是我的 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 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>2.2.2.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>maxwell</groupId>
    <artifactId>appdemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>appdemo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>11</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jersey</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.security/spring-security-taglibs -->
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-taglibs</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-rest -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-tomcat -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>


        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>providet</scope> 
        </dependency>

        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <scope>provided</scope>
        </dependency>

        <!-- Tests -->

        <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>io.projectreactor</groupId>
            <artifactId>reactor-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-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>

Answer 1

我也遇到過這個問題，所以我們不能同時使用spring-boot-starter-web和spring-boot-starter-jersey因為glassfish是jersey一部分，所以在我的情況下，只需從它們兩個中刪除任何一個依賴項，我刪除了starter-jersey

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

終於問題解決了請試試

Answer 2

您應該在 pom.xml 中將包裝添加到 war： <packaging>war</packaging>

Answer 3

你的依賴似乎有問題：你能檢查一下這個錯字嗎

tomcat-embed-jasper 依賴

providet

另一個問題，如果您使用的是 tomcat，那么為什么您有兩個依賴項會很好。

   <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>


        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>providet</scope> 
        </dependency>

檢查那個示例 pom

spring boot web依賴就足夠了，它已經包含了tomcat。 您不需要顯式定義 tomcat 依賴項

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

Answer 4

如果它是一個新項目，我會嘗試運行在以下位置生成的標准項目： https : //start.spring.io/ 。 通過這種方式，您可以確保項目應該是可運行的，並且任何失敗都歸咎於項目或 IDE 以外的任何事情。 如果那不運行我會重新安裝Tomcat。