Drools在Maven项目中抛出异常

Question

我用6.5.0版创建了一个drools项目。决赛进行得很顺利。但当我创建一个maven项目时，它的抛出错误

Caused by: java.lang.NoSuchMethodError: com.thoughtworks.xstream.XStream.fromXML(Ljava/net/URL;)Ljava/lang/Object;
at org.drools.compiler.kproject.models.KieModuleModelImpl$kModuleMarshaller.fromXML(KieModuleModelImpl.java:207)
at org.drools.compiler.kproject.models.KieModuleModelImpl.fromXML(KieModuleModelImpl.java:154)
at org.drools.compiler.kie.builder.impl.ClasspathKieProject.fetchKModule(ClasspathKieProject.java:179)
at org.drools.compiler.kie.builder.impl.ClasspathKieProject.fetchKModule(ClasspathKieProject.java:141)
at org.drools.compiler.kie.builder.impl.ClasspathKieProject.discoverKieModules(ClasspathKieProject.java:112)
at org.drools.compiler.kie.builder.impl.ClasspathKieProject.init(ClasspathKieProject.java:84)
at org.drools.compiler.kie.builder.impl.KieContainerImpl.<init>(KieContainerImpl.java:139)
at org.drools.compiler.kie.builder.impl.KieServicesImpl.newKieClasspathContainer(KieServicesImpl.java:135)
at org.drools.compiler.kie.builder.impl.KieServicesImpl.getKieClasspathContainer(KieServicesImpl.java:101)
at org.drools.compiler.kie.builder.impl.KieServicesImpl.getKieClasspathContainer(KieServicesImpl.java:79)
at com.powerschool.cc.validationengine.engine.ValidationEngine.getKieSession(ValidationEngine.java:49)
at com.powerschool.cc.validationengine.engine.ValidationEngine.validationEngine(ValidationEngine.java:24)

这是我在POM文件中的依赖项

<dependencies>

    <dependency>
        <groupId>org.json</groupId>
        <artifactId>json</artifactId>
        <version>20140107</version>
    </dependency>
    <dependency>
        <groupId>org.kie</groupId>
        <artifactId>kie-api</artifactId>
        <version>${runtime.version}</version>
    </dependency>
    <dependency>
        <groupId>org.drools</groupId>
        <artifactId>drools-core</artifactId>
        <version>${runtime.version}</version>
    </dependency>
    <dependency>
        <groupId>org.drools</groupId>
        <artifactId>drools-compiler</artifactId>
        <version>${runtime.version}</version>
    </dependency>
    <dependency>
        <groupId>javax.enterprise</groupId>
        <artifactId>cdi-api</artifactId>
        <version>${cdi.version}</version>
    </dependency>
    <dependency>
        <groupId>org.jboss.weld.se</groupId>
        <artifactId>weld-se-core</artifactId>
        <version>${weld.version}</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>${junit.version}</version>
        <scope>test</scope>
    </dependency>
    <dependency>
         <groupId>com.thoughtworks.xstream</groupId>
         <artifactId>xstream</artifactId> 
        <version>1.4.10-java7</version> </dependency>
</dependencies>

这是密码

private KieSession getKieSession(){
    KieServices services = null;
    KieContainer container = null;
    KieSession kieSession = null;
    try{

        services = KieServices.Factory.get();
        container = services.getKieClasspathContainer();
        kieSession = container.newKieSession("ksession-rules");
    }catch(Exception e){
        e.printStackTrace();
    }
    return kieSession;
}

getKieClasspathContainer正在抛出错误。

谷歌搜索了这个错误，发现添加Xstream依赖项可以解决这个问题，但解决不了。使用Java 7和tomcat 7。我需要向POM添加任何其他依赖项吗？有人知道吗？

Answer 1

xstream的POM中的依赖项版本是1.4.10-java7。

Drools 6.5.0-Final附带jar文件xstream-1.4.9。这意味着Drools jar是根据这个版本编译的。

我不能保证这就是你犯这个错误的原因，但值得一试。