Question

如何解决此异常：

线程中的异常＆＃34; main＆＃34; org.neo4j.kernel.lifecycle.LifecycleException：无法转换零件＆＃39; org.neo4j.kernel.impl.pagecache.PageCacheLifecycle@4b845428'从停止了SHUTTING_DOWN。请参阅附件原因例外 org.neo4j.kernel.lifecycle.LifeSupport $ LifecycleInstance.shutdown（LifeSupport.java:559）在 org.neo4j.kernel.lifecycle.LifeSupport.shutdown（LifeSupport.java:200）在 org.neo4j.kernel.InternalAbstractGraphDatabase.shutdown（InternalAbstractGraphDatabase.java:685）在 org.neo4j.kernel.InternalAbstractGraphDatabase.run（InternalAbstractGraphDatabase.java:340）在 org.neo4j.kernel.EmbeddedGraphDatabase。（EmbeddedGraphDatabase.java:59）在 org.neo4j.graphdb.factory.GraphDatabaseFactory.newDatabase（GraphDatabaseFactory.java:108）在 org.neo4j.graphdb.factory.GraphDatabaseFactory $ 1.newDatabase（GraphDatabaseFactory.java:95）在 org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase（GraphDatabaseBuilder.java:176）在 org.neo4j.graphdb.factory.GraphDatabaseFactory.newEmbeddedDatabase（GraphDatabaseFactory.java:67）在neo4jExamples.secondExample.main（secondExample.java:18）引起： java.lang.IllegalStateException：无法关闭PageCache 文件仍然映射：neostore.relationshiptypestore.db.names（1 映射） org.neo4j.io.pagecache.impl.muninn.MuninnPageCache.close（MuninnPageCache.java:473）在 org.neo4j.kernel.impl.pagecache.PageCacheLifecycle.shutdown（PageCacheLifecycle.java:42）在 org.neo4j.kernel.lifecycle.LifeSupport $ LifecycleInstance.shutdown（LifeSupport.java:555） ... 9更多

我的代码是：

package neo4jExamples;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;

public class secondExample {

    public static void main(String[] args) {

        GraphDatabaseService graphDb;
        Node firstNode;
        Node secondNode;
        Relationship relationship;

        graphDb = new GraphDatabaseFactory().newEmbeddedDatabase("/var/lib/neo4j/data/graph.db");
        registerShutdownHook( graphDb );

        try (Transaction tx = graphDb.beginTx()) {

            firstNode = graphDb.createNode();
            firstNode.setProperty( "message", "Hello, " );
            secondNode = graphDb.createNode();
            secondNode.setProperty( "message", "World!" );

            relationship = firstNode.createRelationshipTo( secondNode, RelTypes.KNOWS );
            relationship.setProperty( "message", "brave Neo4j " );

            System.out.print( firstNode.getProperty( "message" ) );
            System.out.print( relationship.getProperty( "message" ) );
            System.out.print( secondNode.getProperty( "message" ) );


            tx.success();
        }

    }

    private static void registerShutdownHook(final GraphDatabaseService graphDb) {

            Runtime.getRuntime().addShutdownHook(new Thread() {
                @Override
                public void run() {
                    graphDb.shutdown();
                }
            });
        }

    }

Answer 1

我可以在这里想到两个原因：

另一个java进程正在访问某些文件，除非其他内容有助于考虑kill -9 <pid>
仔细检查graph.db文件夹中的文件权限。

创建maven项目以在neo4j服务器上运行时出错

1 个答案: