从Micronaut Java应用程序访问Heroku上的neo4j/graphenedb（免开发计划）失败：与数据库的连接终止

Question

目前，我正在Heroku平台上与Neo4J/Graphenedb（免开发计划）作斗争。通过“Heroku Local”在本地启动我的应用程序很好，它将(Neo4j Java Driver 4）连接到Neo4j 3.5.18（从Docker映像“Neo4j:3.5”运行）。

INFO  Driver - Direct driver instance 1523082263 created for server address hobby-[...]ldel.dbs.graphenedb.com:24787
WARN  RetryLogic - Transaction failed and will be retried in 1032ms
org.neo4j.driver.exceptions.ServiceUnavailableException: Connection to the database terminated. Please ensure that your database is listening on the correct host and port and that you have compatible encryption settings both on Neo4j server and driver. Note that the default encryption setting has changed in Neo4j 4.0.
 at org.neo4j.driver.internal.util.Futures.blockingGet(Futures.java:143)
 at org.neo4j.driver.internal.InternalSession.beginTransaction(InternalSession.java:163)
 at org.neo4j.driver.internal.InternalSession.lambda$transaction$4(InternalSession.java:147)
 at org.neo4j.driver.internal.retry.ExponentialBackoffRetryLogic.retry(ExponentialBackoffRetryLogic.java:101)
 at org.neo4j.driver.internal.InternalSession.transaction(InternalSession.java:146)
 at org.neo4j.driver.internal.InternalSession.readTransaction(InternalSession.java:112)
 at org.neo4j.driver.internal.InternalSession.readTransaction(InternalSession.java:106)
 at PersonController.logInfoOf(PersonController.java:57)
 at PersonController.<init>(PersonController.java:50)
 at $PersonControllerDefinition.build(Unknown Source)
 at io.micronaut.context.DefaultBeanContext.doCreateBean(DefaultBeanContext.java:1814)
 [...]
 at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
 at java.base/java.lang.Thread.run(Thread.java:832)
Suppressed: org.neo4j.driver.internal.util.ErrorUtil$InternalExceptionCause: null
 at org.neo4j.driver.internal.util.ErrorUtil.newConnectionTerminatedError(ErrorUtil.java:52)
 at org.neo4j.driver.internal.async.connection.HandshakeHandler.channelInactive(HandshakeHandler.java:81)
 [...]
 at org.neo4j.driver.internal.shaded.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
 at org.neo4j.driver.internal.shaded.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
 ... 1 common frames omitted

我肯定会从正确注入应用程序的OS环境变量GRAPHENEDB_BOLT_URL、GRAPHENEDB_BOLT_USER和GRAPHENEDB_BOLT_PASSWORD中获得登录凭据；我已经用一些调试日志语句验证了它：

State changed from starting to up
INFO  io.micronaut.runtime.Micronaut - Startup completed in 2360ms. Server Running: http://localhost:7382
INFO  Application - Neo4j Bolt URIs: [bolt://hobby-[...]ldel.dbs.graphenedb.com:24787]
INFO  Application - Neo4j Bolt encrypted? false
INFO  Application - Neo4j Bolt trust strategy: TRUST_SYSTEM_CA_SIGNED_CERTIFICATES
INFO  Application - Changed trust strategy to: TRUST_ALL_CERTIFICATES
INFO  Application - Env.: GRAPHENEDB_BOLT_URL='bolt://hobby-[...]ldel.dbs.graphenedb.com:24787'
INFO  Application - Env.: GRAPHENEDB_BOLT_USER='app1[...]hdai'
INFO  Application - Env.: GRAPHENEDB_BOLT_PASSWORD of length 31

我也尝试过通过Heroku插件网站重启GrapheneDB实例，但也有同样的负面结果。

这里出什么问题了？有什么办法可以进一步确定根本原因吗？

Answer 1

我仔细看了一下这个，似乎你需要为石墨烯db实例打开驱动程序加密。这可以在application.yml中进行配置，如下所示：

neo4j:
    encryption: true

下面是一个示例项目https://github.com/aldrinm/micronaut-neo4j-heroku以供参考