Neo4j 服务器在 Weblogic 上使用 Java Bolt neo4j-ogm

Question

我在从 Java EE 连接到 neo4j 服务器时遇到问题。

我使用：
- neo4j 3.0.1 在本地主机上处于服务器模式
- Weblogic 12.1.3
- JEE 7
- neo4j-ogm-core 2.0.3
- neo4j-ogm-螺栓驱动程序 2.0.3

我的 Maven 依赖项：

<dependency>
    <groupId>org.neo4j</groupId>
    <artifactId>neo4j-ogm-core</artifactId>
    <version>2.0.3</version>
</dependency>
<dependency>
    <groupId>org.neo4j</groupId>
    <artifactId>neo4j-ogm-bolt-driver</artifactId>
    <version>2.0.3</version>
</dependency>

我的 ogm.properties 在 resources/META-INF 中：

#Driver, required
driver=org.neo4j.ogm.drivers.bolt.driver.BoltDriver

#URI of the Neo4j database, required. If no port is specified, the default port 7687 is used. Otherwise, a port can be specified with bolt://neo4j:password@localhost:1234
URI=bolt://neo4j:xxxxxx@localhost

#Connection pool size (the maximum number of sessions per URL), optional, defaults to 50
connection.pool.size=150

#Encryption level (TLS), optional, defaults to REQUIRED. Valid values are NONE,REQUIRED
encryption.level=NONE

#Trust strategy, optional, not used if not specified. Valid values are TRUST_ON_FIRST_USE,TRUST_SIGNED_CERTIFICATES
trust.strategy=TRUST_ON_FIRST_USE

我使用 EJB 单例来定义会话工厂：

@Singleton
public class Neo4jSessionFactory {

    private SessionFactory sessionFactory;

    @PostConstruct
    public void init() {
        sessionFactory = new SessionFactory("com.toto.poc.ejb.data.access");
    }

    /**
     * Get neo4j session
     * @return the session
     */
    public Session getNeo4jSession() {
        return sessionFactory.openSession();
    }
}

它在 "com.toto.poc.ejb.data.access" 包中。

我有一个 EJB 来定义要调用的业务方法：

@Stateless
public class TopologyBusiness {

    private @EJB Neo4jSessionFactory neo4jSessionFactory;

    public Iterable<Map<String, Object>> getApplication(String irt) {
        String query = "MATCH (a:Application) WHERE a.irt = '" + irt + "' RETURN a";

        Session session = neo4jSessionFactory.getNeo4jSession();

        return session.query(query, Collections.emptyMap());
    }
}

但是当我的客户端调用TopologyBusiness时，调用了Neo4jSessionFactory的init(PostConstruct)方法，出现了错误：

com.oracle.pitchfork.interfaces.LifecycleCallbackException: Failure to invoke public void com.toto.poc.ejb.data.access.Neo4jSessionFactory.init() on bean class class com.toto.poc.ejb.data.access.Neo4jSessionFactory_wi88u8_Impl with args: null
    at com.oracle.pitchfork.inject.Jsr250Metadata.invokeLifecycleMethod(Jsr250Metadata.java:379)
    at com.oracle.pitchfork.inject.Jsr250Metadata.invokeLifecycleMethods(Jsr250Metadata.java:352)
    at com.oracle.pitchfork.intercept.InterceptionMetadata.invokeLifecycleMethods(InterceptionMetadata.java:399)
    at weblogic.ejb.container.injection.EjbComponentCreatorImpl.invokePostConstruct(EjbComponentCreatorImpl.java:55)
    at weblogic.ejb.container.manager.SingletonSessionManager.constructAndInitBean(SingletonSessionManager.java:330)
    Truncated. see log file for complete stacktrace
Caused By: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.oracle.pitchfork.inject.Jsr250Metadata.invokeLifecycleMethod(Jsr250Metadata.java:377)
    Truncated. see log file for complete stacktrace
Caused By: java.lang.RuntimeException: org.neo4j.ogm.exception.ServiceNotFoundException: Resource: zip:C:/oracle/wls/12.1.3/user_projects/domains/CMDB/servers/LocalServer/tmp/_WL_user/poc-cdb-ear_ear/a8qjfi/poc-cdb-ejb-1.0-SNAPSHOT.jar!/com/toto.poc/ejb/data/access
    at org.neo4j.ogm.ClassUtils.getUniqueClasspathElements(ClassUtils.java:178)
    at org.neo4j.ogm.scanner.ClassPathScanner.getUniqueClasspathElements(ClassPathScanner.java:158)
    at org.neo4j.ogm.scanner.ClassPathScanner.scan(ClassPathScanner.java:130)
    at org.neo4j.ogm.metadata.DomainInfo.load(DomainInfo.java:316)
    at org.neo4j.ogm.metadata.DomainInfo.<init>(DomainInfo.java:67)
    Truncated. see log file for complete stacktrace
Caused By: org.neo4j.ogm.exception.ServiceNotFoundException: Resource: zip:C:/oracle/wls/12.1.3/user_projects/domains/CMDB/servers/LocalServer/tmp/_WL_user/poc-cdb-ear_ear/a8qjfi/poc-cdb-ejb-1.0-SNAPSHOT.jar!/com/toto.poc/ejb/data/access
    at org.neo4j.ogm.service.ResourceService.resolve(ResourceService.java:53)
    at org.neo4j.ogm.ClassUtils.getUniqueClasspathElements(ClassUtils.java:175)
    at org.neo4j.ogm.scanner.ClassPathScanner.getUniqueClasspathElements(ClassPathScanner.java:158)
    at org.neo4j.ogm.scanner.ClassPathScanner.scan(ClassPathScanner.java:130)
    at org.neo4j.ogm.metadata.DomainInfo.load(DomainInfo.java:316)
    Truncated. see log file for complete stacktrace

根本原因似乎是：

Caused By: org.neo4j.ogm.exception.ServiceNotFoundException: Resource: zip:C:/oracle/wls/12.1.3/user_projects/domains/CMDB/servers/LocalServer/tmp/_WL_user/poc-cdb-ear_ear/a8qjfi/poc-cdb-ejb-1.0-SNAPSHOT.jar!/com/toto.poc/ejb/data/access

我不知道它为什么要查看类路径中的 zip ...
感谢您的帮助！

Answer 1

我终于可以解决我的问题了，我浏览了一些奇怪的论坛，发现有人在 JBoss 上有类似的问题。
所以我设法将这个解决方案转换为 Weblogic。

首先，您需要创建自己的资源解析器来提供处理"zip".
的方式覆盖 ResourceResolver 并实现 resolve 方法，如下所示：

public class Neo4jResourceResolver implements ResourceResolver {

    @Override
    public File resolve(URL resource) throws Exception {

        switch (resource.getProtocol()) {
            case "file":
                return new File(resource.toURI());
            case "jar":
            case "zip":
                String jarPath = resource.getPath().substring(0, resource.getPath().indexOf("!"));
                return new File(jarPath);
            default:
                return null;
        }
    }
}

然后在路径“src/main/resources/META-INF/services”中创建一个名为“org.neo4j.ogm.classloader.ResourceResolver”的文件。
此文件仅包含一行，即您自定义 ResourceResolver 的路径 class :

com.toto.poc.core.access.ucmdb.Neo4jResourceResolver

这很神奇，很有效！！！

Neo4j 现在将探索 jar 存档，找到您的 NodeEntities 并将其映射到您的图形:)

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