Neo4j“没有依赖满足类型类 org.neo4j.kernel.api.index.SchemaIndexProvider" [英] Neo4j "No dependency satisfies type class org.neo4j.kernel.api.index.SchemaIndexProvider"

问题描述

Neo4j 社区 2.3.3 Linux (Ubuntu 14.04)

Neo4j Community 2.3.3 Linux (Ubuntu 14.04)

尝试运行一个使用 Kafka 主题的 Java 应用，在查询 Neo4j 时处理其消息，并将它们写入另一个 Kafka 主题.

Trying to run a Java app which consumes a Kafka topic, process its messages while querying Neo4j, and writes them to another Kafka topic.

hduser@ubuntu:~$ java -jar gradle1-0.1.0.jar localhost:9092 musicgrp raw-events enriched-events bad-events /home/ubuntu/GeoLiteCity.dat
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Exception in thread "main" java.lang.RuntimeException: Error starting org.neo4j.kernel.impl.factory.CommunityFacadeFactory, /home/hduser/neo4jdb2/data/graph.db
    at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:143)
    at org.neo4j.kernel.impl.factory.CommunityFacadeFactory.newFacade(CommunityFacadeFactory.java:43)
    at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:108)
    at org.neo4j.graphdb.factory.GraphDatabaseFactory.newDatabase(GraphDatabaseFactory.java:129)
    at org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:117)
    at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:185)
    at music.StreamApp.main(StreamApp.java:40)
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.NeoStoreDataSource@1d606256' was successfully initialized, but failed to start. Please see attached cause exception.
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:462)
    at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:111)
    at org.neo4j.kernel.impl.transaction.state.DataSourceManager.start(DataSourceManager.java:112)
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:452)
    at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:111)
    at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:139)
    ... 6 more
Caused by: org.neo4j.kernel.impl.util.UnsatisfiedDependencyException: No dependency satisfies type class org.neo4j.kernel.api.index.SchemaIndexProvider
    at org.neo4j.kernel.impl.util.Dependencies.resolveDependency(Dependencies.java:78)
    at org.neo4j.kernel.impl.util.Dependencies.resolveDependency(Dependencies.java:74)
    at org.neo4j.kernel.NeoStoreDataSource.start(NeoStoreDataSource.java:507)
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:452)
    ... 11 more

这是我的 gradle.build，我读了一些关于将 Neo4j jars 排除在包之外的帖子......通过使用 --classpath 指向它的 jars ... 我是 Gradle 的新手，这是否相关?

This is my gradle.build, I read some post about keeping Neo4j jars out of the bundle ... by pointing to its jars with --classpath ... I'm new to Gradle, is this relevant ?

apply plugin: 'java'
apply plugin: 'application'
sourceCompatibility = '1.8' 
mainClassName = 'music.StreamApp'
repositories {
    mavenCentral()
}
version = '0.1.0'
dependencies { 
    compile 'org.apache.kafka:kafka-clients:0.9.0.0'
    compile 'com.maxmind.geoip:geoip-api:1.2.14'
    compile 'com.fasterxml.jackson.core:jackson-databind:2.6.3'
    compile 'org.slf4j:slf4j-api:1.7.5'
    compile 'org.neo4j:neo4j:2.3.3'
}
jar { // c
manifest {
    attributes 'Main-Class': mainClassName
}
from {
    configurations.compile.collect {
        it.isDirectory() ? it : zipTree(it)
    }
} {
    exclude "META-INF/*.SF"
    exclude "META-INF/*.DSA"
    exclude "META-INF/*.RSA"
}
}

推荐答案

我怀疑你没有 META-INF/services/org.neo4j.kernel.extension.KernelExtensionFactory 文件在你的罐子里正确.Neo4j 在内部使用 JVM 的 ServiceLoader 来加载其组件.

My suspicion is that you don't have the META-INF/services/org.neo4j.kernel.extension.KernelExtensionFactory files in your jar correctly. Internally Neo4j uses JVM's ServiceLoader to load its components.

见 https://github.com/neo4j/neo4j/blob/2.3/community/lucene-index/src/main/resources/META-INF/services/org.neo4j.kernel.extension.KernelExtensionFactory 用于可能丢失的部分.

See https://github.com/neo4j/neo4j/blob/2.3/community/lucene-index/src/main/resources/META-INF/services/org.neo4j.kernel.extension.KernelExtensionFactory for the potentially missing piece.

我认为解决此问题的正确方法不是更改 Gradle 的默认 jar 任务，而是使用正确处理 META-INF 文件的插件.我使用 shadow 插件获得了一些不错的体验.

I assume the right way to solve this is not by changing Gradle's default jar task, instead use a plugin that handles META-INF files correctly. I've made some good experiences with the shadow plugin.

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