无法实例化实现：AstyanaxStoreManager

Question

我尝试访问与卡桑德拉后端泰坦图形数据库和一切工作正常用下面的代码：

package ch.uzh.ifi.ddis.dm.twhc.clusterhierarchy; 

    import ch.uzh.ifi.ddis.dm.twhc.clusterhierarchy.persistence.ITreeSerializer; 
    import ch.uzh.ifi.ddis.dm.twhc.clusterhierarchy.persistence.TitanSerializer; 

    public class ConnectionOkDriver { 

     public static void main(String[] args) { 
      ITreeSerializer serializer = TitanSerializer.getInstance(); 
      if (serializer.dbConnected()) { 
       System.out.print("connection ok"); 
      } else { 
       System.out.print("connection NOT ok"); 
      } 
     } 
    } 

输出（忽略SLF4J错误）：

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. 
    connection ok 

现在，如果我启动以下主要方法，我得到一个Could not instantiate implementation错误：

package ch.uzh.ifi.ddis.dm.twhc.input; 

    import ch.uzh.ifi.ddis.dm.twhc.clusterhierarchy.persistence.ITreeSerializer; 
    import ch.uzh.ifi.ddis.dm.twhc.clusterhierarchy.persistence.TitanSerializer; 

    public class ConnectionFailsDriver { 

     public static void main(String[] args) { 
      ITreeSerializer serializer = TitanSerializer.getInstance(); 
      if (serializer.dbConnected()) { 
       System.out.print("connection ok"); 
      } else { 
       System.out.print("connection NOT ok"); 
      } 
     } 
    } 

输出（再次忽略SLF4J错误）：

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.ExceptionInInitializerError 
at ch.uzh.ifi.ddis.dm.twhc.input.ConnectionFailsDriver.main(ConnectionFailsDriver.java:9) 
Caused by: java.lang.IllegalArgumentException: Could not instantiate implementation: com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager 
at com.thinkaurelius.titan.diskstorage.Backend.getImplementationClass(Backend.java:274) 
at com.thinkaurelius.titan.diskstorage.Backend.getStorageManager(Backend.java:227) 
at com.thinkaurelius.titan.diskstorage.Backend.<init>(Backend.java:97) 
at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.getBackend(GraphDatabaseConfiguration.java:440) 
at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.<init>(StandardTitanGraph.java:67) 
at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:40) 
at ch.uzh.ifi.ddis.dm.twhc.clusterhierarchy.persistence.TitanSerializer.<init>(TitanSerializer.java:88) 
at ch.uzh.ifi.ddis.dm.twhc.clusterhierarchy.persistence.TitanSerializer.<clinit>(TitanSerializer.java:78) 
... 1 more 
Caused by: java.lang.reflect.InvocationTargetException 
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 
at com.thinkaurelius.titan.diskstorage.Backend.getImplementationClass(Backend.java:263) 
... 8 more 
Caused by: java.lang.NoSuchMethodError: com.netflix.astyanax.AstyanaxContext.getClient()Ljava/lang/Object; 
at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.<init>(AstyanaxStoreManager.java:166) 
... 13 more 

正如你所看到的类ConnectionOkDriver和ConnectionFailsDriver仅在包中定义的不同。但是，这两个类包含在不同的Maven模块中（2whc-clustering-impl依赖于2whc-cluster-hierarchy-impl）。我想后我的项目结构的图像，但我不能这样做:(这里是将图像的链接：https://dl.dropboxusercontent.com/u/48169775/project-structure.png

在我TitanSerializer对象在TitanFactory.open(conf)构造出现的错误。这是代码：

private static final String DB_TYPE = "cassandra"; 
    private static final String DB_IP = "127.0.0.1"; 
    private TitanSerializer() { 
      Configuration conf = new BaseConfiguration(); 
      conf.setProperty("storage.backend", DB_TYPE); 
      conf.setProperty("storage.hostname", DB_IP); 
      this.graph = TitanFactory.open(conf); 
      . 
      . 
      . 
    } 

你有一个想法，为什么我得到这个错误

Answer 1

的问题涉及到分布于多行家模块的依赖要解决它，我感动了所有的“外部”之类的依赖。 titan-all到核心（或者我们应该怎么称呼它？）maven模块2whc。所有其他模块现在只依赖于我自己的模块。例如2whc-clustering-impl仅取决于2whc-cluster-hierarchy-impl和2whc-cluster-hierarchy-impl根本就没有任何依赖关系。然而，eclipse Maven POM Editor的选项卡有效pom显示了所有模块的模块自身的依赖关系和核心模块2whc dependecies。

POM的2whc-clustering-impl：

POM的 2whc-cluster-hierarchy-impl POM 2whc的

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
    <modelVersion>4.0.0</modelVersion> 
    <parent> 
     <artifactId>2whc</artifactId> 
     <groupId>ch.uzh.ifi.ddis.dm</groupId> 
     <version>0.0.1-SNAPSHOT</version> 
     <relativePath>..</relativePath> 
    </parent> 

    <artifactId>2whc-cluster-hierarchy-impl</artifactId> 

    ... 

    <dependencies> 

    </dependencies> 
</project> 

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
    <modelVersion>4.0.0</modelVersion> 
    <parent> 
     <artifactId>2whc</artifactId> 
     <groupId>ch.uzh.ifi.ddis.dm</groupId> 
     <version>0.0.1-SNAPSHOT</version> 
     <relativePath>..</relativePath> 
    </parent> 

    <artifactId>2whc-clustering-impl</artifactId> 

    ... 

    <dependencies>  
     <dependency> 
      <groupId>ch.uzh.ifi.ddis.dm</groupId> 
      <artifactId>2whc-cluster-hierarchy-impl</artifactId> 
      <version>0.0.1-SNAPSHOT</version> 
     </dependency> 
    </dependencies> 
</project> 

：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
    <modelVersion>4.0.0</modelVersion> 

    <groupId>ch.uzh.ifi.ddis.dm</groupId> 
    <artifactId>2whc</artifactId> 
    <version>0.0.1-SNAPSHOT</version> 
    <packaging>pom</packaging> 
    <name>Two-Way Hierarchical Clustering</name> 

    ... 

    <modules> 
     <module>2whc-clustering-api</module> 
     <module>2whc-clustering-impl</module> 
     <module>2whc-cluster-hierarchy-impl</module> 
     <module>2whc-recommendations-impl</module> 
    </modules> 

    ... 

    <dependencies> 
     <dependency> 
      <groupId>org.slf4j</groupId> 
      <artifactId>slf4j-api</artifactId> 
      <version>${slf4j.version}</version> 
      <scope>provided</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.slf4j</groupId> 
      <artifactId>slf4j-log4j12</artifactId> 
      <version>${slf4j.version}</version> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.testng</groupId> 
      <artifactId>testng</artifactId> 
      <version>${testng.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>net.sf.supercsv</groupId> 
      <artifactId>super-csv</artifactId> 
      <version>2.1.0</version> 
     </dependency>  
     <dependency> 
      <groupId>org.apache.xmlbeans</groupId> 
      <artifactId>xmlbeans</artifactId> 
      <version>2.6.0</version> 
     </dependency>  
     <dependency> 
      <groupId>net.sf.trove4j</groupId> 
      <artifactId>trove4j</artifactId> 
      <version>3.0.3</version> 
     </dependency>  
     <dependency> 
      <groupId>org.apache.commons</groupId> 
      <artifactId>commons-math3</artifactId> 
      <version>3.2</version> 
     </dependency>   
     <dependency> 
      <groupId>ch.uzh.agglorecommender</groupId> 
      <artifactId>inputbeans</artifactId> 
      <version>0.01</version> 
     </dependency>   
     <dependency> 
      <groupId>com.thinkaurelius.titan</groupId> 
      <artifactId>titan-all</artifactId> 
      <version>0.3.2</version> 
     </dependency>   
    </dependencies> 
    <properties> 
     <testng.version>6.8.5</testng.version> 
     <slf4j.version>1.6.6</slf4j.version> 
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 
    </properties> 
</project>