阅读此documentation时,我尝试以这种方式应用于我的代码:
三倍
@Entity
@Table(name = "triple")
@NodeEntity
public class TripleDBMoldelNeoImpl implements TripleDBModel{
protected List<Annotation> annotations;
@RelatedTo(type = "subject", elementClass = (Class<? extends NodeBacked>) Concept.class) //This is the suggestion Eclipse gives me
public Concept subject;
@RelatedTo(type = "object", elementClass = Concept.class)
public Concept object;
@RelatedTo(type = "predicate", elementClass = Concept.class)
public Concept predicate;
@ManyToMany(
cascade={CascadeType.ALL },
fetch=FetchType.LAZY
)
@JoinTable(name = "triple_has_annotation",
joinColumns={@JoinColumn(name="uri_concept_subject"), @JoinColumn(name="uri_concept_object"), @JoinColumn(name="uri_concept_predicate") },
inverseJoinColumns=@JoinColumn(name="annotation_id") )
public List<Annotation> getAnnotations() {
return annotations;
}
public void setAnnotations(List<Annotation> annotations) {
this.annotations = annotations;
}
@Id
@Column(name = "subject", length = 100)
public Concept getSubject() {
return subject;
}
public void setSubject(Concept subject) {
this.subject = subject;
}
@Id
@Column(name = "object", length = 100)
public Concept getObject() {
return object;
}
public void setObject(Concept object) {
this.object = object;
}
@Id
@Column(name = "predicate", length = 100)
public Concept getPredicate() {
return predicate;
}
public void setPredicate(Concept predicate) {
this.predicate = predicate;
}
概念
@NodeEntity(partial = true)
public class ConceptNeoImpl implements java.io.Serializable, Concept {
private static final long serialVersionUID = 1L;
private String uri;
private String label;
private String ontologyElement;
private List<Annotation> annotations;
@RelatedTo(type = "conceptSub", elementClass = TripleDBModel.class)
private TripleDBModel triple;
public TripleDBModel getTriple() {
return triple;
}
public void setTriple(TripleDBModel triple) {
this.triple = triple;
}
下图说明了我想要的用途
然后,表三元组将使用neo4j,概念将使用jpa和neo4j。我正在使用Eclipse IDE进行编程,它为我提供了纠正错误的建议。第一个是:
@RelatedTo(type = "conceptUriSubject", elementClass = Concept.class)
改正为
@RelatedTo(type = "conceptUriSubject", elementClass = (Class<? extends NodeBacked>) Concept.class)
然后,问题没有解决,并给了我nex消息
这行有多个标记
-注释属性RelatedTo.elementClass的值必须是一个类
文字
-类型安全:未经检查的班级之间的转型
NodeBacked>
-注释属性RelatedTo.elementClass的值必须是一个类
文字
-类型安全:未经检查的班级之间的转型
NodeBacked>
任何想法-我在这方面都是新手,所以我很失落,我已经在春季论坛上问过,但没有成功。提前致谢
编辑
我的
pom.xml
上的插件<plugins>
<plugin>
<!-- Execute the main class -->
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>exec</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>org.springframework.data.neo4j.examples.hellograph.App</mainClass>
</configuration>
</plugin>
<plugin>
<!-- IntelliJ Idea Support -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-idea-plugin</artifactId>
<version>2.2</version>
<configuration>
<downloadSources>true</downloadSources>
<dependenciesAsLibraries>true</dependenciesAsLibraries>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<version>1.0</version>
<dependencies>
<!-- NB: You must use Maven 2.0.9 or above or these are ignored (see
MNG-2972) -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>${aspectj.version}</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjtools</artifactId>
<version>${aspectj.version}</version>
</dependency>
</dependencies>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
<configuration>
<outxml>true</outxml>
<aspectLibraries>
<aspectLibrary>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
</aspectLibrary>
<aspectLibrary>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-neo4j</artifactId>
</aspectLibrary>
</aspectLibraries>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
eclipse中安装的软件
最佳答案
请使用此更新站点在您的Eclipse IDE中安装AspectJ插件:
http://download.eclipse.org/tools/ajdt/36/dev/update
然后,您应该能够使用上下文菜单为项目启用AspectJ支持。
您的域类将得到增强,以实现NodeBacked接口,然后IDE不会在注释或其他地方给您任何错误。
对困惑感到抱歉。我们将在下一版本中解决这些问题。
更新:
抱歉,我之前没有注意到,但是您放入elementClass中的Concept实际上是一个接口,因为既没有使用@NodeEntity进行注释,也没有扩展NodeBacked,这才是真正的问题。
我想您在Spring forums中也问过这个问题,这是我的建议:
您的概念是一个接口,目前不扩展NodeBacked。
通常,将NodeBacked接口添加到具有@NodeEntity批注的类。
然后,您可以尝试相同的解决方案。
也可以使用@NodeEntity注释Concept。
或让Concept本身扩展NodeBacked
重要说明:elementClass应该引用具体的实现(尽管它仅用于检查与目标的兼容性,但它可能与接口配合使用)。
关于java - @RelatedTo(elementClass = Concept.class)RelatedTo.elementClass必须是类liter,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/6017767/