neo4j embedded：java.lang.UnsupportedOperationException：未安装任何查询引擎

时间：2017-09-04 13:46:15

标签： neo4j

当我尝试对嵌入式Neo4J实例执行查询时，我收到以下异常：

No query engine installed.
java.lang.UnsupportedOperationException: No query engine installed.
    at org.neo4j.kernel.impl.query.NoQueryEngine.noQueryEngine(NoQueryEngine.java:56)
    at org.neo4j.kernel.impl.query.NoQueryEngine.executeQuery(NoQueryEngine.java:33)
    at org.neo4j.kernel.impl.factory.ClassicCoreSPI.executeQuery(ClassicCoreSPI.java:77)
    at org.neo4j.kernel.impl.factory.GraphDatabaseFacade.execute(GraphDatabaseFacade.java:429)
    at org.neo4j.kernel.impl.factory.GraphDatabaseFacade.execute(GraphDatabaseFacade.java:412)
    at org.neo4j.kernel.impl.factory.GraphDatabaseFacade.execute(GraphDatabaseFacade.java:396)

包含以下依赖项：“org.neo4j”％“neo4j-cypher”％“3.1.3”

这是我的代码片段，我从测试中执行：

val graphDb = new GraphDatabaseFactory().newEmbeddedDatabase(new File(my_db_path))
graphDb.execute(my_query)

这是Neo4J部分的依赖树：

[info] Resolving jline#jline;2.14.4 ...
[info] Done updating.
...
[info]   |     
[info]   +-org.neo4j.driver:neo4j-java-driver:1.4.3
[info]   +-org.neo4j:neo4j-cypher:3.1.3 [S]
[info]   | +-net.sf.opencsv:opencsv:2.3
[info]   | +-org.neo4j:neo4j-codegen:3.1.3
[info]   | | +-org.apache.commons:commons-lang3:3.3.2
[info]   | | +-org.ow2.asm:asm:5.0.4
[info]   | | 
[info]   | +-org.neo4j:neo4j-cypher-compiler-2.3:2.3.9
[info]   | | +-com.googlecode.concurrentlinkedhashmap:concurrentlinkedhashmap-lru:1.4.2
[info]   | | +-org.neo4j:neo4j-cypher-frontend-2.3:2.3.9
[info]   | | | +-org.apache.commons:commons-lang3:3.3.2
[info]   | | | +-org.parboiled:parboiled-scala_2.11:1.1.7
[info]   | | | | +-org.parboiled:parboiled-core:1.1.7
[info]   | | | | 
[info]   | | | +-org.scala-lang:scala-reflect:2.12.3 [S]
[info]   | | | 
[info]   | | +-org.parboiled:parboiled-scala_2.11:1.1.7
[info]   | | | +-org.parboiled:parboiled-core:1.1.7
[info]   | | | 
[info]   | | +-org.scala-lang:scala-reflect:2.12.3 [S]
[info]   | | 
[info]   | +-org.neo4j:neo4j-cypher-compiler-3.0:3.0.8
[info]   | | +-org.neo4j:neo4j-cypher-frontend-3.0:3.0.8
[info]   | | | +-org.apache.commons:commons-lang3:3.3.2
[info]   | | | +-org.parboiled:parboiled-scala_2.11:1.1.7
[info]   | | |   +-org.parboiled:parboiled-core:1.1.7
[info]   | | |   
[info]   | | +-org.parboiled:parboiled-scala_2.11:1.1.7
[info]   | |   +-org.parboiled:parboiled-core:1.1.7
[info]   | |   
[info]   | +-org.neo4j:neo4j-cypher-compiler-3.1:3.1.3
[info]   | | +-com.github.ben-manes.caffeine:caffeine:2.3.3
[info]   | | +-org.neo4j:neo4j-cypher-frontend-3.1:3.1.3
[info]   | | | +-org.apache.commons:commons-lang3:3.3.2
[info]   | | | +-org.parboiled:parboiled-scala_2.11:1.1.7
[info]   | | |   +-org.parboiled:parboiled-core:1.1.7
[info]   | | |   
[info]   | | +-org.parboiled:parboiled-scala_2.11:1.1.7
[info]   | |   +-org.parboiled:parboiled-core:1.1.7
[info]   | |   
[info]   | +-org.neo4j:neo4j-graph-algo:3.1.3
[info]   | | +-org.neo4j:neo4j-kernel:3.1.3
[info]   | |   +-org.neo4j:neo4j-collections:3.1.3
[info]   | |   | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | +-org.neo4j:neo4j-resource:3.1.3
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[info]   | |   +-org.neo4j:neo4j-common:3.1.3
[info]   | |   +-org.neo4j:neo4j-csv:3.1.3
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[info]   | |   | | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-resource:3.1.3
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[info]   | |   | +-org.neo4j:neo4j-primitive-collections:3.1.3
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[info]   | |   |   +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   |   +-org.neo4j:neo4j-unsafe:3.1.3
[info]   | |   |   
[info]   | |   +-org.neo4j:neo4j-graphdb-api:3.1.3
[info]   | |   | +-org.neo4j:neo4j-collections:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   | | 
[info]   | |   | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-resource:3.1.3
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[info]   | |   | | 
[info]   | |   | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   | 
[info]   | |   +-org.neo4j:neo4j-io:3.1.3
[info]   | |   | +-org.apache.commons:commons-lang3:3.3.2
[info]   | |   | +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-unsafe:3.1.3
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[info]   | |   +-org.neo4j:neo4j-logging:3.1.3
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[info]   | |   |   +-org.apache.commons:commons-lang3:3.3.2
[info]   | |   |   +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |   |   | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   |   | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   |   | +-org.neo4j:neo4j-unsafe:3.1.3
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[info]   | |   |   +-org.neo4j:neo4j-unsafe:3.1.3
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[info]   | |   +-org.neo4j:neo4j-lucene-upgrade:3.1.3
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[info]   | |   | +-org.apache.lucene:lucene-core:5.5.0
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[info]   | |   +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |     +-org.neo4j:neo4j-common:3.1.3
[info]   | |     +-org.neo4j:neo4j-resource:3.1.3
[info]   | |     +-org.neo4j:neo4j-unsafe:3.1.3
[info]   | |     
[info]   | +-org.neo4j:neo4j-graph-matching:3.1.3
[info]   | | +-org.neo4j:neo4j-kernel:3.1.3
[info]   | |   +-org.neo4j:neo4j-collections:3.1.3
[info]   | |   | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   | 
[info]   | |   +-org.neo4j:neo4j-common:3.1.3
[info]   | |   +-org.neo4j:neo4j-csv:3.1.3
[info]   | |   | +-org.neo4j:neo4j-collections:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   | | 
[info]   | |   | +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |   |   +-org.neo4j:neo4j-common:3.1.3
[info]   | |   |   +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   |   +-org.neo4j:neo4j-unsafe:3.1.3
[info]   | |   |   
[info]   | |   +-org.neo4j:neo4j-graphdb-api:3.1.3
[info]   | |   | +-org.neo4j:neo4j-collections:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   | | 
[info]   | |   | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-unsafe:3.1.3
[info]   | |   | | 
[info]   | |   | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   | 
[info]   | |   +-org.neo4j:neo4j-io:3.1.3
[info]   | |   | +-org.apache.commons:commons-lang3:3.3.2
[info]   | |   | +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-unsafe:3.1.3
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[info]   | |   | +-org.neo4j:neo4j-unsafe:3.1.3
[info]   | |   | 
[info]   | |   +-org.neo4j:neo4j-logging:3.1.3
[info]   | |   | +-org.neo4j:neo4j-io:3.1.3
[info]   | |   |   +-org.apache.commons:commons-lang3:3.3.2
[info]   | |   |   +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |   |   | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   |   | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   |   | +-org.neo4j:neo4j-unsafe:3.1.3
[info]   | |   |   | 
[info]   | |   |   +-org.neo4j:neo4j-unsafe:3.1.3
[info]   | |   |   
[info]   | |   +-org.neo4j:neo4j-lucene-upgrade:3.1.3
[info]   | |   | +-org.apache.lucene:lucene-backward-codecs:5.5.0
[info]   | |   | | +-org.apache.lucene:lucene-core:5.5.0
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[info]   | |   | +-org.apache.lucene:lucene-core:5.5.0
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[info]   | |   +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |     +-org.neo4j:neo4j-common:3.1.3
[info]   | |     +-org.neo4j:neo4j-resource:3.1.3
[info]   | |     +-org.neo4j:neo4j-unsafe:3.1.3
[info]   | |     
[info]   | +-org.neo4j:neo4j-lucene-index:3.1.3
[info]   | | +-org.apache.lucene:lucene-analyzers-common:5.5.0
[info]   | | | +-org.apache.lucene:lucene-core:5.5.0
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[info]   | | +-org.apache.lucene:lucene-codecs:5.5.0
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[info]   | | +-org.apache.lucene:lucene-core:5.5.0
[info]   | | +-org.apache.lucene:lucene-queryparser:5.5.0
[info]   | | | +-org.apache.lucene:lucene-core:5.5.0
[info]   | | | 
[info]   | | +-org.neo4j:neo4j-kernel:3.1.3
[info]   | |   +-org.neo4j:neo4j-collections:3.1.3
[info]   | |   | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   | 
[info]   | |   +-org.neo4j:neo4j-common:3.1.3
[info]   | |   +-org.neo4j:neo4j-csv:3.1.3
[info]   | |   | +-org.neo4j:neo4j-collections:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   | | 
[info]   | |   | +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |   |   +-org.neo4j:neo4j-common:3.1.3
[info]   | |   |   +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   |   +-org.neo4j:neo4j-unsafe:3.1.3
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[info]   | |   +-org.neo4j:neo4j-graphdb-api:3.1.3
[info]   | |   | +-org.neo4j:neo4j-collections:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   | | 
[info]   | |   | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-resource:3.1.3
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[info]   | |   | +-org.neo4j:neo4j-resource:3.1.3
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[info]   | |   +-org.neo4j:neo4j-io:3.1.3
[info]   | |   | +-org.apache.commons:commons-lang3:3.3.2
[info]   | |   | +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   | | +-org.neo4j:neo4j-unsafe:3.1.3
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[info]   | |   | +-org.neo4j:neo4j-unsafe:3.1.3
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[info]   | |   +-org.neo4j:neo4j-logging:3.1.3
[info]   | |   | +-org.neo4j:neo4j-io:3.1.3
[info]   | |   |   +-org.apache.commons:commons-lang3:3.3.2
[info]   | |   |   +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |   |   | +-org.neo4j:neo4j-common:3.1.3
[info]   | |   |   | +-org.neo4j:neo4j-resource:3.1.3
[info]   | |   |   | +-org.neo4j:neo4j-unsafe:3.1.3
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[info]   | |   |   +-org.neo4j:neo4j-unsafe:3.1.3
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[info]   | |   +-org.neo4j:neo4j-lucene-upgrade:3.1.3
[info]   | |   | +-org.apache.lucene:lucene-backward-codecs:5.5.0
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[info]   | |   | +-org.apache.lucene:lucene-core:5.5.0
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[info]   | |   +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   | |     +-org.neo4j:neo4j-common:3.1.3
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[info]   | |     +-org.neo4j:neo4j-unsafe:3.1.3
[info]   | |     
[info]   | +-org.parboiled:parboiled-scala_2.11:1.1.7
[info]   | | +-org.parboiled:parboiled-core:1.1.7
[info]   | | 
[info]   | +-org.scala-lang:scala-reflect:2.12.3 [S]
[info]   | 
[info]   +-org.neo4j:neo4j-lucene-index:3.1.3
[info]   | +-org.apache.lucene:lucene-analyzers-common:5.5.0
[info]   | | +-org.apache.lucene:lucene-core:5.5.0
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[info]   | +-org.apache.lucene:lucene-codecs:5.5.0
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[info]   | +-org.apache.lucene:lucene-core:5.5.0
[info]   | +-org.apache.lucene:lucene-queryparser:5.5.0
[info]   | | +-org.apache.lucene:lucene-core:5.5.0
[info]   | | 
[info]   | +-org.neo4j:neo4j-kernel:3.1.3
[info]   |   +-org.neo4j:neo4j-collections:3.1.3
[info]   |   | +-org.neo4j:neo4j-common:3.1.3
[info]   |   | +-org.neo4j:neo4j-resource:3.1.3
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[info]   |   +-org.neo4j:neo4j-common:3.1.3
[info]   |   +-org.neo4j:neo4j-csv:3.1.3
[info]   |   | +-org.neo4j:neo4j-collections:3.1.3
[info]   |   | | +-org.neo4j:neo4j-common:3.1.3
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[info]   |   | +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   |   |   +-org.neo4j:neo4j-common:3.1.3
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[info]   |   |   +-org.neo4j:neo4j-unsafe:3.1.3
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[info]   |   +-org.neo4j:neo4j-graphdb-api:3.1.3
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[info]   |   | +-org.neo4j:neo4j-common:3.1.3
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[info]   |   +-org.neo4j:neo4j-io:3.1.3
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[info]   |   | +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   |   | | +-org.neo4j:neo4j-common:3.1.3
[info]   |   | | +-org.neo4j:neo4j-resource:3.1.3
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[info]   |   +-org.neo4j:neo4j-logging:3.1.3
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[info]   |   |   +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   |   |   | +-org.neo4j:neo4j-common:3.1.3
[info]   |   |   | +-org.neo4j:neo4j-resource:3.1.3
[info]   |   |   | +-org.neo4j:neo4j-unsafe:3.1.3
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[info]   |   |   +-org.neo4j:neo4j-unsafe:3.1.3
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[info]   |   +-org.neo4j:neo4j-lucene-upgrade:3.1.3
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[info]   |   | +-org.apache.lucene:lucene-core:5.5.0
[info]   |   | 
[info]   |   +-org.neo4j:neo4j-primitive-collections:3.1.3
[info]   |     +-org.neo4j:neo4j-common:3.1.3
[info]   |     +-org.neo4j:neo4j-resource:3.1.3
[info]   |     +-org.neo4j:neo4j-unsafe:3.1.3
[info]   |     
[info]   +-org.slf4j:slf4j-simple:1.7.23
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[info]   | +-org.slf4j:slf4j-api:1.7.25
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[success] Total time: 4 s, completed Sep 4, 2017 3:25:38 PM

有没有人有任何线索，这里有什么问题？

提前致谢。

1 个答案:

答案 0 :(得分：0)

在运行时验证正确的类路径

为了加载cypher引擎，你需要几个名为“neo4j-cypher-compiler * .jar”的jar。在调试模式下评估tf.nn.rnn_cell 以查看JVM访问的完整jar文件列表。看起来你有那些基于你的SBT输出，但运行时是唯一的事实。

原因＃1：依赖阴影

它可能是你的一个依赖与neo4j的传递依赖冲突。将neo4j放在SBT中可以解决这个问题。 （这对我有用）

原因＃2：最大命令行覆盖率（仅限Windows）

Neo4j有很多罐子。对于Windows的最大字符数，可能是System.getProperty("java.class.path")命令太长。请参阅：How to set a long Java classpath in Windows?

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