java maven eclipse tomcat 启动失败NoClassDefFoundError

Question

我正在为 eclipse+tomcat 配置而苦恼。我在云上部署了我的应用程序，但我希望离线进行一些更改(速度更快)，然后部署一些可以工作的东西。我使用 Maven 设置了 Web 项目。我有 2 个依赖项(未提及必要的 javax):org.json 和 joda-time。问题是我不知道如何下载这些依赖项。每次我想运行项目时，tomcat 都无法以长堆栈跟踪启动，但我知道问题出在那一行:Caused by: Java.lang.NoClassDefFoundError: javax/json/JsonObject。这意味着，不存在依赖项 jar(我认为是 int WEB-INF/lib)。我已经在项目->maven->更新项目上尝试过 ppm，在服务器上尝试过 ppm->clean，在服务器上尝试过 ppm-> 发布。我还检查了 project->properties->Deployment Asembly 和 Maven Dependencies 在那里......我在网上搜索了很多，但我的想法已经用完了。感谢您的帮助，干杯!

更新 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>openshifttest</groupId>
    <artifactId>openshifttest</artifactId>
    <packaging>war</packaging>
    <version>1.0</version>
    <name>openshifttest</name>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>

        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20090211</version>
        </dependency>

        <dependency>
            <groupId>joda-time</groupId>
            <artifactId>joda-time</artifactId>
            <version>2.8.2</version>
        </dependency>

    </dependencies>

<profiles>
    <profile>
     <!-- When built in OpenShift the 'openshift' profile will be used when invoking mvn. -->
     <!-- Use this profile for any OpenShift specific customization your app will need. -->
     <!-- By default that is to put the resulting archive into the 'deployments' folder. -->
     <!-- http://maven.apache.org/guides/mini/guide-building-for-different-environments.html -->
     <id>openshift</id>
     <build>
        <finalName>openshifttest</finalName>
        <plugins>
          <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.3</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                    <outputDirectory>deployments</outputDirectory>
                      <warName>ROOT</warName>
                </configuration>
            </plugin>
        </plugins>
      </build>
    </profile>
  </profiles>
</project>

Answer 1

我认为tomcat可能没有提供Java EE API，请尝试更改

    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-api</artifactId>
        <version>7.0</version>
        <scope>provided</scope>
    </dependency>

到

    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-api</artifactId>
        <version>7.0</version>
    </dependency>

(删除提供的范围)。