spring - 如何修复'java.lang.NoClassDefFoundError：org/apache/tinkerpop/gremlin/process/traversal/dsl/graph/GraphTraversalSource$GraphTraversalSourceStub'？

问题描述

我正在尝试使用 TinkerGraph 初始化内存中的图。

首先，我在上下文 xml 文件中定义了 bean，并尝试初始化 TinkerGraph。

我的目的是对我为形成 gremlin 查询而创建的类进行单元测试，我从这些类中获得的最终查询是字符串的形式，所以为了通过 TinkerGraph 执行它们，我使用了以下帖子中给出的方法： Get Gremlin query as a String and execute it in java without submit it to the GremlinServer

我还想知道我采用的方法是否是首选方法，用于将 gremlin 查询作为单元测试的一部分运行？

以下是我在 pom.xml 中包含的依赖项：

<dependency>
    <groupId>org.apache.tinkerpop</groupId>
    <artifactId>tinkergraph-gremlin</artifactId>
    <version>3.2.4</version>
</dependency>

<dependency>
      <groupId>org.apache.tinkerpop</groupId>
      <artifactId>gremlin-groovy</artifactId>
      <version>3.0.2-incubating</version>
</dependency>

EmbeddedGremlinQueryEngine 如下：


import org.apache.tinkerpop.gremlin.driver.Result;
import org.apache.tinkerpop.gremlin.driver.ResultSet;
import org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
import org.apache.tinkerpop.gremlin.structure.Graph;
import org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.script.Bindings;
import javax.script.ScriptEngine;
import javax.script.ScriptException;
import java.util.List;

public class UcsEmbeddedGremlinQueryEngine implements GremlinEngine{

    private static final Logger logger = LoggerFactory.getLogger(UcsEmbeddedGremlinQueryEngine.class);
    private GraphTraversalSource graphTraversalSource = null;
    private Graph graph = null;
    private ScriptEngine engine = null;
    private Bindings bindings = null;

    public UcsEmbeddedGremlinQueryEngine() {
        graph = TinkerGraph.open();
        graphTraversalSource = graph.traversal();
        engine = new GremlinGroovyScriptEngine();
        bindings = engine.createBindings();
        bindings.put("g", graphTraversalSource);
    }

    public void shutdown() throws Exception {
        if (graph != null){
            graph.close();
        }
        logger.info("TinkerGraph shutdown complete.");
    }

    @Override
    public List<Result> query(String query) {
        List<Result> res = null;
        try {
            ResultSet results = (ResultSet) engine.eval(query, bindings);
            res = results.all().join();

            for (Result r : res) {
                System.out.println("result: " + r + '\n');
            }

        } catch (ScriptException e) {
            e.printStackTrace();
        }
        return res;
    }

    // This function reads the initScript and run them as gremlin queries.
    public synchronized void initialize() {
        logger.debug("Initializing embedded TinkerGraph. This will only take a few seconds....");
        //TODO include the execution of queries as part of initialisation
    }
}

堆栈跟踪如下：

java.lang.NoClassDefFoundError: org/apache/tinkerpop/gremlin/process/traversal/dsl/graph/GraphTraversalSource$GraphTraversalSourceStub
    at org.apache.tinkerpop.gremlin.groovy.loaders.StepLoader.load(StepLoader.groovy:54)
    at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:236)
    at org.apache.tinkerpop.gremlin.groovy.loaders.GremlinLoader.load(GremlinLoader.groovy:28)
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.<init>(GremlinGroovyScriptEngine.java:189)
    at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.<init>(GremlinGroovyScriptEngine.java:172)
    at com.intuit.gro.mcsdata.gemlinengine.UcsEmbeddedGremlinQueryEngine.<init>(UcsEmbeddedGremlinQueryEngine.java:28)

EmbeddedGremlinQueryEngine 被定义为 xml 文件中的 bean，当加载 bean 时，由于构造函数抛出异常，我得到错误；嵌套异常是 java.lang.NoClassDefFoundError: org/apache/tinkerpop/gremlin/process/traversal/dsl/graph/GraphTraversalSource$GraphTraversalSourceStub

我不明白 GraphTraversalSourceStub 在初始化过程中是如何出现的，我找不到任何有关它的信息。任何帮助，将不胜感激。

标签： springgremlintinkergraph

spring - 如何修复'java.lang.NoClassDefFoundError：org/apache/tinkerpop/gremlin/process/traversal/dsl/graph/GraphTraversalSource$GraphTraversalSourceStub'？

问题描述

解决方案

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