NoSuchMethodException mit dem datastax cassandra mapper

Question

Ich habe gerade angefangen, mit Cassandra und Java zu experimentieren, mit den Spring REST-Bibliotheken.

jedoch diesen Fehler Ich erhalte, wenn im das Objekt wieder aus cassandra Ich erhalte diesen Fehler

java.lang.NoSuchMethodException: objects.DataSet.<init>() 
at java.lang.Class.getConstructor0(Class.java:3082) ~[na:1.8.0_111] 
at java.lang.Class.getConstructor(Class.java:1825) ~[na:1.8.0_111] 
at com.datastax.driver.mapping.ReflectionUtils.newInstance(ReflectionUtils.java:37) ~[cassandra-driver-mapping-3.1.0.jar:na] 
at com.datastax.driver.mapping.EntityMapper.newEntity(EntityMapper.java:62) ~[cassandra-driver-mapping-3.1.0.jar:na] 

Dies ist, wie im mit dem Mapper

@RequestMapping(value="/data_sets/{dataSetId}", method=RequestMethod.GET) 
public DataSet show(@PathVariable(value="dataSetId") String dataSetId){ 
    Cluster cluster = Cluster.builder().withClusterName("testCluster").addContactPoint("127.0.0.1").build(); 
    Session session = cluster.connect("testks"); 

    MappingManager manager = new MappingManager(session); 

    Mapper<DataSet> mapper = manager.mapper(DataSet.class); 

    System.out.println("loading data set ...."); 
    DataSet dataSet = mapper.get(dataSetId); 
    return dataSet; 
} 

und heren das Objekt zu erhalten versuchen,

@Table(keyspace="testks", name="DataSet", caseSensitiveKeyspace=false, caseSensitiveTable=false) 
public class DataSet { 

@PartitionKey 
@Column 
String id; 
@Column 
String name; 

public String getName() { 
    return name; 
} 

public DataSet setName(String name) { 
    this.name = name; 
    return this; 
} 

public DataSet setId(String id){ 
    this.id = id; 
    return this; 
} 

public DataSet(String name){ 
    this.id = UUIDs.timeBased().toString(); 
    this.name = name; 
} 

was fehlt mir?

EDIT:

heres die pom.xml

<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>Banana</groupId> 
<artifactId>Banana</artifactId> 
<version>0.0.1-SNAPSHOT</version> 
<build> 
    <plugins> 
     <plugin> 
      <artifactId>maven-compiler-plugin</artifactId> 
      <version>3.5.1</version> 
      <configuration> 
       <source /> 
       <target /> 
      </configuration> 
     </plugin> 
    </plugins> 
</build> 

<parent> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-parent</artifactId> 
    <version>1.4.2.RELEASE</version> 
    <relativePath /> <!-- lookup parent from repository --> 
</parent> 

<dependencies> 
    <!--<dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-cassandra</artifactId> 
     <version>1.4.4.RELEASE</version> </dependency> --> 
    <dependency> 
     <groupId>com.datastax.cassandra</groupId> 
     <artifactId>cassandra-driver-core</artifactId> 
     <version>3.1.0</version> 
    </dependency> 
    <dependency> 
     <groupId>com.fasterxml.jackson.dataformat</groupId> 
     <artifactId>jackson-dataformat-xml</artifactId> 
    </dependency> 
    <dependency> 
     <groupId>com.datastax.cassandra</groupId> 
     <artifactId>cassandra-driver-mapping</artifactId> 
     <version>3.1.0</version> 
    </dependency> 
    <dependency> 
     <groupId>com.datastax.cassandra</groupId> 
     <artifactId>cassandra-driver-extras</artifactId> 
     <version>3.1.0</version> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-data-rest</artifactId> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework.security</groupId> 
     <artifactId>spring-security-web</artifactId> 
     <version>4.2.1.BUILD-SNAPSHOT</version> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-test</artifactId> 
     <scope>test</scope> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-web</artifactId> 
     <version>3.0.4.RELEASE</version> 
    </dependency> 
    <dependency> 
     <groupId>com.jayway.jsonpath</groupId> 
     <artifactId>json-path</artifactId> 
     <version>2.2.0</version> 
    </dependency> 
</dependencies> 

<properties> 
    <java.version>1.8</java.version> 
</properties> 

<repositories> 
    <repository> 
     <id>spring-milestone</id> 
     <name>Spring Maven MILESTONE Repository</name> 
     <url>http://repo.spring.io/libs-milestone</url> 
    </repository> 
    <repository> 
     <id>spring-releases</id> 
     <url>https://repo.spring.io/libs-release</url> 
    </repository> 
    <repository> 
     <id>spring-snapshots</id> 
     <name>Spring Snapshots</name> 
     <url>https://repo.spring.io/libs-snapshot</url> 
     <snapshots> 
      <enabled>true</enabled> 
     </snapshots> 
    </repository> 
</repositories> 

<pluginRepositories> 
    <pluginRepository> 
     <id>spring-releases</id> 
     <url>https://repo.spring.io/libs-release</url> 
    </pluginRepository> 
</pluginRepositories> 

Answer 1

Oh, ich sehe jetzt das Problem

Sie benötigen einen Konstruktor

@Table(keyspace="testks", name="DataSet", caseSensitiveKeyspace=false, caseSensitiveTable=false) 
public class DataSet { 

@PartitionKey 
@Column 
String id; 
@Column 
String name; 

public Dataset() { 
} 

public String getName() { 
    return name; 
} 

public DataSet setName(String name) { 
    this.name = name; 
    return this; 
} 

public DataSet setId(String id){ 
    this.id = id; 
    return this; 
} 

public DataSet(String name){ 
    this.id = UUIDs.timeBased().toString(); 
    this.name = name; 
} 
}