java - 使用 Spring Data 从嵌入式 neo4j 迁移到 REST

标签 java spring rest neo4j

我一直在使用 neo4j embedded 和 SpringData 开发我的项目。一切运行良好，并已通过嵌入式数据库进行了全面测试。我的印象是 (http://docs.spring.io/spring-data/data-graph/docs/1.1.0.RC1/reference/multi/reference_neo4j-server.html) 迁移到 REST API 将是对应用程序上下文的简单更改(请参阅上面的链接)。但是，当我尝试使用 REST api 时，我收到一个带有消息“Not In Transaction”的 java IllegalStateException。使用嵌入式数据库时我没有看到此错误。

我在嵌入式数据库中成功使用了@Transactional 注释。唯一的代码更改是应用程序上下文中的“graphDatabaseService”bean，如上面的链接所示。

通常如何解决此错误？我不得不认为它经常被击中。请在下面找到该问题的一个非常简单的重现。

返回

异常

org.springframework.transaction.TransactionSystemException: Unexpected internal transaction state; nested exception is java.lang.IllegalStateException: Not in transaction

NeoTest.java

package com.mycompany.hellospringdata;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.neo4j.support.Neo4jTemplate;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.transaction.annotation.Transactional;
import static org.junit.Assert.*;

@ContextConfiguration(locations = "classpath:testContext.xml")
@RunWith(SpringJUnit4ClassRunner.class)
public class NeoTest {

  @Autowired
  Neo4jTemplate template;

  @Test
  @Transactional
  public void testSomething() {

    Person add = new Person();
    add.setName("Jorgan Jorgansen");
    add = template.save(add); 

    Person other = template.findOne(add.getId(), Person.class);
    assertNotNull("Retrieved entity is non-null", other);
    assertEquals("Retrieved entity equals saved entity", add, other);

  }
}

Person.java

package com.mycompany.hellospringdata;

import org.springframework.data.neo4j.annotation.GraphId;
import org.springframework.data.neo4j.annotation.NodeEntity;

@NodeEntity
public class Person {
  @GraphId
  private Long id;

  private String name;

  public String getName() {
    return name;
  }

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

  public Long getId() {
    return id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  @Override
  public int hashCode() {
    int hash = 7;
    hash = 23 * hash + (this.name != null ? this.name.hashCode() : 0);
    return hash;
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    final Person other = (Person) obj;
    if ((this.name == null) ? (other.name != null) : !this.name.equals(other.name)) {
      return false;
    }
    return true;
  }

}

testContext.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:neo4j="http://www.springframework.org/schema/data/neo4j"
        xsi:schemaLocation="
            http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context.xsd
            http://www.springframework.org/schema/data/neo4j
            http://www.springframework.org/schema/data/neo4j/spring-neo4j-2.0.xsd">

    <context:annotation-config/>
    <neo4j:config graphDatabaseService="graphDatabaseService"/>

    <!-- 
    <bean id="graphDatabaseService" class="org.neo4j.test.ImpermanentGraphDatabase" destroy-method="shutdown"/>
     -->


    <bean id="graphDatabaseService" class="org.neo4j.rest.graphdb.RestGraphDatabase">
            <constructor-arg value="http://<neo4j-server-here>:7474/db/data"/>
    </bean>

</beans>

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>com.mycompany.app</groupId> 
  <artifactId>helloSpringData</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>helloSpringData</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <repositories>
      <repository>
          <id>neotechnology-releases</id>
          <url>http://m2.neo4j.org/content/repositories/releases/</url>
      </repository>
  </repositories>

  <dependencies>
    <dependency>
      <groupId>org.neo4j</groupId>
      <artifactId>neo4j</artifactId>
      <version>1.9.3</version>
    </dependency>
    <dependency>
         <groupId>org.neo4j</groupId>
         <artifactId>neo4j-kernel</artifactId>
         <version>1.9.3</version>
    </dependency> 
    <dependency>
       <groupId>org.neo4j</groupId>
       <artifactId>neo4j-kernel</artifactId>
       <version>1.9.3</version>
       <type>test-jar</type>
       <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.neo4j</groupId>
        <artifactId>neo4j-cypher</artifactId>
        <version>1.9.3</version>
    </dependency>
    <dependency>
        <groupId>org.neo4j</groupId>
        <artifactId>neo4j-rest-graphdb</artifactId>
        <version>1.9</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-neo4j-rest</artifactId>
        <version>2.2.2.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.data</groupId>
      <artifactId>spring-data-neo4j</artifactId>
      <version>2.2.2.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>3.2.3.RELEASE</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.8.2</version>
      <scope>test</scope>
    </dependency>
    <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
       <version>1.6.6</version>
     </dependency>
     <dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-simple</artifactId>
         <version>1.6.6</version>
     </dependency>
     <dependency>
        <groupId>cglib</groupId>
        <artifactId>cglib</artifactId>
        <version>3.0</version>
    </dependency>
   <dependency>
        <groupId>org.ow2.asm</groupId>
        <artifactId>asm-all</artifactId>
        <version>4.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.geronimo.specs</groupId>
        <artifactId>geronimo-validation_1.0_spec</artifactId>
        <version>1.1</version>
    </dependency>

  </dependencies>
</project>

最佳答案

好吧，经过几个痛苦的小时后，这就是让它发挥作用的原因。

  1. 更新 POM 以使用最新版本的 SpringData

  2. 删除@Transactional。 REST 尚不支持它。

这是更新后的 POM

    <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>com.mycompany.app</groupId> 
  <artifactId>helloSpringData</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>helloSpringData</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>

    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-neo4j-rest</artifactId>
        <version>2.3.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-neo4j</artifactId>
        <version>2.3.1.RELEASE</version>
    </dependency>        
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>3.2.3.RELEASE</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.8.2</version>
      <scope>test</scope>
    </dependency>
    <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
       <version>1.6.6</version>
     </dependency>
     <dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-simple</artifactId>
         <version>1.6.6</version>
     </dependency>
    <dependency>
        <groupId>org.apache.geronimo.specs</groupId>
        <artifactId>geronimo-validation_1.0_spec</artifactId>
        <version>1.1</version>
    </dependency>
    <dependency>
        <groupId>cglib</groupId>
        <artifactId>cglib</artifactId>
        <version>3.0</version>
    </dependency>  
    <dependency>
        <groupId>org.ow2.asm</groupId>
        <artifactId>asm-all</artifactId>
        <version>4.1</version>
    </dependency>
  </dependencies>
</project>

关于java - 使用 Spring Data 从嵌入式 neo4j 迁移到 REST，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19148683/

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