运行JPOS Q2时出现NoClassDefFoundError错误求助

首次通过Maven与IntelliJ搭建JPOS Q2环境，运行时触发如下错误：

Exception in thread "main" java.lang.NoClassDefFoundError: org/osgi/framework/BundleException
at Q2_Main.main(Q2_Main.java:6)
Caused by: java.lang.ClassNotFoundException: org.osgi.framework.BundleException
    at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
    ... 1 more

Process finished with exit code 1

已通过Maven引入jpos 2.1.6依赖，执行了Maven Clean+Install操作，外部库中可见jpos依赖，但问题仍未解决。

环境配置详情 #

POM文件配置 #

<?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>org.example</groupId>
    <artifactId>Q2_JPOS_TEST</artifactId>
    <version>1.0-SNAPSHOT</version>

<properties>
    <maven.compiler.source>8</maven.compiler.source>
    <maven.compiler.target>8</maven.compiler.target>
</properties>

<dependencies>
    <dependency>
        <groupId>org.jpos</groupId>
        <artifactId>jpos</artifactId>
        <version>2.1.6</version>
    </dependency>
</dependencies>
</project>

运行代码 #

import org.jpos.q2.Q2;

public class Q2_Main {

public static void main(String[] args){
    Q2 q2 = new Q2("src/main/java/deploy");
    q2.start();
}
}

操作步骤 #

• 文件->新建项目->Maven项目（自动生成POM）
• 将主项目中的JPOS依赖复制到新POM文件
• 在IntelliJ Maven面板执行Clean + Install
• 创建Q2_Main.java
• 点击运行按钮后出现上述错误

依赖树信息 #

[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------< org.example:Q2_JPOS_TEST >------------ 
[INFO] Building Q2_JPOS_TEST 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]----------------------- 
[INFO]
[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ 
Q2_JPOS_TEST ---
[INFO] org.example:Q2_JPOS_TEST:jar:1.0-SNAPSHOT
[INFO] \- org.jpos:jpos:jar:2.1.6:compile
[INFO]    +- commons-cli:commons-cli:jar:1.4:compile
[INFO]    +- org.apache-extras.beanshell:bsh:jar:2.0b6:compile
[INFO]    +- org.bouncycastle:bcprov-jdk15on:jar:1.67:compile
[INFO]    +- org.bouncycastle:bcpg-jdk15on:jar:1.67:compile
[INFO]    +- org.hdrhistogram:HdrHistogram:jar:2.1.12:compile
[INFO]    +- org.javatuples:javatuples:jar:1.2:compile
[INFO]    +- org.jdom:jdom2:jar:2.0.6:compile
[INFO]    +- org.jline:jline:jar:3.19.0:compile
[INFO]    \- org.slf4j:slf4j-api:jar:1.7.30:compile
[INFO] --------------------------------------------------------------    
[INFO] BUILD SUCCESS
[INFO] --------------------------------------------------------------    
[INFO] Total time:  2.205 s
[INFO] Finished at: 2023-02-17T15:43:38-07:00
[INFO] -------------------------------------------------------------- 

Maven Settings配置 #

<?xml version="1.0" encoding="UTF-8"?>
<settings xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.1.0 
http://maven.apache.org/xsd/settings-1.1.0.xsd" 
xmlns="http://maven.apache.org/SETTINGS/1.1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<servers>
    <server>
        <username>user</username>
        <password>password</password>
        <id>artifactory</id>
    </server>
</servers>
<mirrors>
    <mirror>
        <id>artifactory</id>
        <url>https://artifactory.company.com:443/central</url>
        <mirrorOf>*</mirrorOf>
    </mirror>
</mirrors>
<profiles>
<profile>
  <id>artifactory</id>
  <!--Override the repository (and pluginRepository) "central" from the     
Maven Super POM
      to activate snapshots for both! -->
  <repositories>
    <repository>
      <id>central</id>
      <url>http://central</url>
      <releases>
        <enabled>true</enabled>
      </releases>
      <snapshots>
        <enabled>true</enabled>
      </snapshots>
    </repository>
  </repositories>
  <pluginRepositories>
    <pluginRepository>
      <id>central</id>
      <url>http://central</url>
      <releases>
        <enabled>true</enabled>
      </releases>
      <snapshots>
        <enabled>true</enabled>
      </snapshots>
    </pluginRepository>
  </pluginRepositories>

</profile>
</profiles>

<activeProfiles>
<!--make the profile active all the time -->
<activeProfile>artifactory</activeProfile>
</activeProfiles>
</settings>

解决方案 #

问题出在jpos 2.x的Q2模块依赖OSGI框架类，但默认的jpos依赖并未传递引入OSGI核心包。需要手动在POM的<dependencies>中添加OSGI核心依赖：

<dependency>
    <groupId>org.osgi</groupId>
    <artifactId>org.osgi.core</artifactId>
    <version>6.0.0</version>
</dependency>

添加完成后，执行Maven Clean+Install，重新运行Q2_Main即可解决该错误。

内容的提问来源于stack exchange，提问作者tytyty