ClassNotFoundException 选项策略

Question

当我连接到远程服务器并尝试修改图形时，我得到 java.lang.ClassNotFoundException: Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/tinkerpop/gremlin/process/traversal/strategy/decoration/OptionsStrategy

我尝试搜索有关此异常的信息。我认为发生这种情况是因为与 janusgraph-core、gremlin-server 和 gremlin-driver 的版本发生冲突

//pom file dependencies

<dependencies>
        <dependency>
            <groupId>org.janusgraph</groupId>
            <artifactId>janusgraph-core</artifactId>
            <version>0.3.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tinkerpop</groupId>
            <artifactId>gremlin-driver</artifactId>
            <version>3.4.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tinkerpop</groupId>
            <artifactId>gremlin-server</artifactId>
            <version>3.4.2</version>
        </dependency>
</dependencies>

//jgex-remote.properties file

gremlin.remote.remoteConnectionClass=org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteConnection
gremlin.remote.driver.sourceName=g
gremlin.remote.driver.clusterFile=.../janus_connect_config.yaml

//janus_connect_config.yaml file

hosts: [xxx.xxx.xxx.xxx]
port: xxxx
serializer: {
  className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0,
  config: {
    ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry]
  }
}

// java code
public class App {
    public static void main(String[] args) throws ConfigurationException {
        if (args.length == 0) {
            throw new IllegalArgumentException("Input args must contains path to file with configuration");
        }

        String configFilePath = args[0];

        PropertiesConfiguration connectConfig = new PropertiesConfiguration(configFilePath);

        Cluster cluster = null;
        Client client = null;

        try {
            cluster = Cluster.open(connectConfig.getString("gremlin.remote.driver.clusterFile"));
            client = cluster.connect();

            Bindings b = Bindings.instance();
            GraphTraversalSource graph = EmptyGraph.instance()
                    .traversal()
                    .withRemote(connectConfig);

            Vertex evnyh = graph.addV(b.of("label", "man"))
                    .property("name", "Evnyh")
                    .property("family", "Evnyhovich")
                    .next();
            Vertex lalka = graph.addV(b.of("label", "man"))
                    .property("name", "Lalka")
                    .property("family", "Lalkovich")
                    .next();

            graph.V(b.of("outV", evnyh)).as("a")
                    .V(b.of("inV", lalka)).as("b")
                    .addE(b.of("label", "friend")).from("a")
                    .next();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (client != null) {
                try {
                    client.close();
                } catch (Exception e) {
                    // nothing to do, just close client
                }
            }

            if (cluster != null) {
                try {
                    cluster.close();
                } catch (Exception e) {
                    // nothing to do, just close cluster
                }
            }
        }
    }
}

有人可以帮忙解决这个问题吗？

Answer 1

您的版本不匹配。请注意，JanusGraph 0.3.1 已绑定到 TinkerPop 3.3.x 代码行：

https://github.com/JanusGraph/janusgraph/blob/v0.3.1/pom.xml#L72

和

OptionStrategy

（以及相关功能）直到 3.4.x 代码行才添加到 TinkerPop 中。因此 JanusGraph 无法处理使用此类功能的请求。

Answer 2

我能够连接到 janusgraph 服务器，但通过我的客户端应用程序，我在查询服务器时遇到错误。以下是错误日志... 28 更多 91 [main] INFO org.apache.tinkerpop.gremlin.driver.ConnectionPool - 发出信号关闭主机上的连接池{address=192.168.21.121/192.168.21.121:8182，hostUri=ws://192.168.21.121:8182/gremlin } 核心大小为 1 线程“主”中的异常 java.util.concurrent.CompletionException：io.netty.handler.codec.DecoderException：org.apache.tinkerpop.gremlin.driver.ser.SerializationException：java.lang.IndexOutOfBoundsException：索引：127，大小： 0 在java.util.concurrent.CompletableFuture.reportJoin（CompletableFuture.java：375） 在 java.util.concurrent.CompletableFuture.join(CompletableFuture.java:1934) 在 org.apache.tinkerpop.gremlin.driver.ResultSet.one(ResultSet.java:107) 在 org.apache.tinkerpop.gremlin.driver.ResultSet$1.hasNext(ResultSet.java:159) 在 org.apache.tinkerpop.gremlin.driver.ResultSet$1.next(ResultSet.java:166) 在 org.apache.tinkerpop.gremlin.driver.ResultSet$1.next(ResultSet.java:153) 在 org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteTraversal$TraverserIterator.next(DriverRemoteTraversal.java:142) 在 org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteTraversal$TraverserIterator.next(DriverRemoteTraversal.java:127) 在org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteTraversal.nextTraverser（DriverRemoteTraversal.java:108） 在 org.apache.tinkerpop.gremlin.process.remote.traversal.step.map.RemoteStep.processNextStart(RemoteStep.java:80) 在 org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:129) 在 org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:39) 在 org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversal.next（DefaultTraversal.java:204） 在 com.janus.graph.App.main(App.java:33) 如何解决序列化问题。