Question

我面临一个非常奇怪的问题。当我使用Spring Tools Suit创建war文件并将其部署到Tomcat时，一切正常。但是如果我部署另一个Spring Boot war文件（一个不同的Spring启动项目），那么最新版本会抛出异常。但只要其中只有一个上传，那么它们都可以正常工作，没有例外。

以下是我从其中一个war文件中获得的例外情况。只有在Tomcat上部署了另一个war文件时才会出现这种情况，生成的日志太长而无法在此发布，所以我在这里发布了

https://pastebin.com/6rnAsWT8

以下是服务器信息

root@localhost:/usr/share/tomcat8/bin# ./version.sh 
Using CATALINA_BASE:   /usr/share/tomcat8
Using CATALINA_HOME:   /usr/share/tomcat8
Using CATALINA_TMPDIR: /usr/share/tomcat8/temp
Using JRE_HOME:        /usr
Using CLASSPATH:       /usr/share/tomcat8/bin/bootstrap.jar:/usr/share/tomcat8/bin/tomcat-juli.jar
Server version: Apache Tomcat/8.5.14 (Debian)
Server built:   Sep 3 2017 17:51:58 UTC
Server number:  8.5.14.0
OS Name:        Linux
OS Version:     4.9.0-6-amd64
Architecture:   amd64
JVM Version:    1.8.0_171-8u171-b11-1~deb9u1-b11
JVM Vendor:     Oracle Corporation

下面是pom.xml

<?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.imageapi</groupId>
    <artifactId>ImageAPI</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>ImageAPI</name>
    <description></description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

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

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


        <!-- https://mvnrepository.com/artifact/javax.xml.bind/jaxb-api -->
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
        </dependency>

    </dependencies>

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


</project>

以下是我上传到Tomcat时项目作为war文件所做的更改

@SpringBootApplication
public class ImageApiApplication extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(ImageApiApplication.class);
    }

    public static void main(String[] args) {
        SpringApplication.run(ImageApiApplication.class, args);
    }
}

我的application.properties

spring.datasource.url=jdbc:postgresql://serverup:5432/mydb
spring.datasource.username=mydb
spring.datasource.password=mypass
spring.jpa.generate-ddl=true

spring.security.user.name=myusername
spring.security.user.password=mypass

spring.thymeleaf.cache=false

spring.application.name=imageapi

这里有什么问题？

Answer 1

您收到JMX InstanceAlreadyExists异常。为每个应用程序中的以下属性指定唯一值

          spring.application.name
          spring.jmx.default-domain

希望这会有所帮助。

运行多个Spring启动项目时，Spring启动war文件异常

1 个答案: